{"id":6392,"date":"2026-06-09T15:36:02","date_gmt":"2026-06-09T07:36:02","guid":{"rendered":"https:\/\/xzfastener.com\/?p=6392"},"modified":"2026-06-09T15:36:03","modified_gmt":"2026-06-09T07:36:03","slug":"ultimate-guide-to-high-strength-bolts-choosing-the-right-grade-8-8-10-9-12-9","status":"publish","type":"post","link":"https:\/\/xzfastener.com\/vi\/ultimate-guide-to-high-strength-bolts-choosing-the-right-grade-8-8-10-9-12-9\/","title":{"rendered":"H\u01b0\u1edbng d\u1eabn c\u01a1 b\u1ea3n v\u1ec1 Bu l\u00f4ng c\u01b0\u1eddng \u0111\u1ed9 cao: Ch\u1ecdn \u0111\u00fang c\u1ea5p \u0111\u1ed9 (8.8, 10.9, 12.9)"},"content":{"rendered":"<h2 class=\"wp-block-heading\">Introduction<\/h2>\n\n\n\n<p>Bu l\u00f4ng c\u01b0\u1eddng \u0111\u1ed9 cao l\u00e0 nh\u1eefng b\u1ed9 ph\u1eadn nh\u1ecf nh\u01b0ng ch\u00fang th\u01b0\u1eddng quy\u1ebft \u0111\u1ecbnh xem k\u1ebft c\u1ea5u th\u00e9p, khung m\u00e1y, c\u1ee5m xe, thi\u1ebft b\u1ecb n\u00e2ng h\u1ea1 hay l\u1eafp \u0111\u1eb7t c\u00f4ng nghi\u1ec7p c\u00f3 ho\u1ea1t \u0111\u1ed9ng an to\u00e0n theo th\u1eddi gian hay kh\u00f4ng. \u0110\u1ed1i v\u1edbi ng\u01b0\u1eddi mua v\u00e0 k\u1ef9 s\u01b0, ph\u1ea7n kh\u00f3 kh\u0103n kh\u00f4ng ch\u1ec9 \u0111\u01a1n gi\u1ea3n l\u00e0 t\u00ecm m\u1ed9t con bu-l\u00f4ng c\u00f3 \u0111\u00f3ng d\u1ea5u s\u1ed1 cao h\u01a1n tr\u00ean \u0111\u1ea7u. Th\u00e1ch th\u1ee9c th\u1ef1c s\u1ef1 l\u00e0 l\u1ef1a ch\u1ecdn lo\u1ea1i ph\u00f9 h\u1ee3p v\u1edbi t\u1ea3i tr\u1ecdng, thi\u1ebft k\u1ebf m\u1ed1i n\u1ed1i, ph\u01b0\u01a1ng ph\u00e1p l\u1eafp \u0111\u1eb7t, m\u00f4i tr\u01b0\u1eddng \u0103n m\u00f2n v\u00e0 y\u00eau c\u1ea7u ki\u1ec3m tra.<\/p>\n\n\n\n<p>Khi mua chi ti\u1ebft si\u1ebft ch\u1eb7t qu\u1ed1c t\u1ebf, bu l\u00f4ng C\u1ea5p, 10.9 v\u00e0 12.9 l\u00e0 m\u1ed9t trong nh\u1eefng lo\u1ea1i bu l\u00f4ng h\u1ec7 m\u00e9t c\u01b0\u1eddng \u0111\u1ed9 cao ph\u1ed5 bi\u1ebfn nh\u1ea5t. Ch\u00fang \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng trong m\u00e1y m\u00f3c, x\u00e2y d\u1ef1ng, \u00f4 t\u00f4, thi\u1ebft b\u1ecb n\u0103ng l\u01b0\u1ee3ng, k\u1ebft c\u1ea5u th\u00e9p v\u00e0 l\u1eafp r\u00e1p h\u1ea1ng n\u1eb7ng. Tuy nhi\u00ean, nhi\u1ec1u sai l\u1ea7m khi mua h\u00e0ng x\u1ea3y ra do ng\u01b0\u1eddi mua cho r\u1eb1ng 12.9 lu\u00f4n t\u1ed1t h\u01a1n 10.9, ho\u1eb7c 10.9 lu\u00f4n l\u00e0 b\u1ea3n n\u00e2ng c\u1ea5p an to\u00e0n h\u01a1n t\u1eeb 8.8. Trong th\u1ef1c t\u1ebf, \u0111\u1ed9 b\u1ec1n cao h\u01a1n c\u0169ng c\u00f3 ngh\u0129a l\u00e0 \u0111\u1ed9 d\u1ebbo, \u0111\u1eb7c t\u00ednh m\u00f4-men xo\u1eafn, gi\u1edbi h\u1ea1n l\u1edbp ph\u1ee7, \u0111\u1ed9 nh\u1ea1y m\u1ecfi v\u00e0 r\u1ee7i ro l\u1eafp \u0111\u1eb7t kh\u00e1c nhau.<\/p>\n\n\n\n<p>H\u01b0\u1edbng d\u1eabn n\u00e0y gi\u1ea3i th\u00edch c\u00e1ch ch\u1ecdn bu l\u00f4ng c\u01b0\u1eddng \u0111\u1ed9 cao t\u1eeb g\u00f3c \u0111\u1ed9 mua s\u1eafm v\u00e0 k\u1ef9 thu\u1eadt th\u1ef1c t\u1ebf, gi\u00fap ng\u01b0\u1eddi mua tr\u00e1nh c\u00e1c v\u1ea5n \u0111\u1ec1 v\u1ec1 th\u00f4ng s\u1ed1 k\u1ef9 thu\u1eadt qu\u00e1 cao, th\u00f4ng s\u1ed1 k\u1ef9 thu\u1eadt d\u01b0\u1edbi m\u1ee9c v\u00e0 t\u1ed1n k\u00e9m t\u1ea1i hi\u1ec7n tr\u01b0\u1eddng.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">1. Bu l\u00f4ng c\u01b0\u1eddng \u0111\u1ed9 cao l\u00e0 g\u00ec?<\/h2>\n\n\n\n<p>Bu l\u00f4ng c\u01b0\u1eddng \u0111\u1ed9 cao l\u00e0 bu l\u00f4ng \u0111\u01b0\u1ee3c s\u1ea3n xu\u1ea5t t\u1eeb th\u00e9p carbon trung b\u00ecnh, th\u00e9p h\u1ee3p kim ho\u1eb7c c\u00e1c v\u1eadt li\u1ec7u ph\u00f9 h\u1ee3p kh\u00e1c, th\u01b0\u1eddng \u0111\u01b0\u1ee3c x\u1eed l\u00fd nhi\u1ec7t \u0111\u1ec3 \u0111\u1ea1t \u0111\u01b0\u1ee3c \u0111\u1ed9 b\u1ec1n k\u00e9o v\u00e0 c\u01b0\u1eddng \u0111\u1ed9 n\u0103ng su\u1ea5t cao h\u01a1n so v\u1edbi c\u00e1c lo\u1ea1i \u1ed1c v\u00edt c\u01b0\u1eddng \u0111\u1ed9 th\u1ea5p th\u00f4ng th\u01b0\u1eddng. Trong c\u00e1c h\u1ec7 m\u00e9t, c\u00e1c l\u1edbp thu\u1ed9c t\u00ednh c\u01b0\u1eddng \u0111\u1ed9 cao ph\u1ed5 bi\u1ebfn nh\u1ea5t l\u00e0 8.8, 10.9, v\u00e0 12.9.<\/p>\n\n\n\n<p>Hai con s\u1ed1 trong c\u1ea5p \u0111\u1ed9 bu l\u00f4ng h\u1ec7 m\u00e9t bi\u1ec3u th\u1ecb hi\u1ec7u su\u1ea5t c\u01b0\u1eddng \u0111\u1ed9. Trong \u0111i\u1ec1u ki\u1ec7n mua h\u00e0ng \u0111\u01a1n gi\u1ea3n:<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>L\u1edbp bu l\u00f4ng<\/th><th>X\u1ea5p x\u1ec9. \u0110\u1ed9 b\u1ec1n k\u00e9o<\/th><th>X\u1ea5p x\u1ec9. T\u1ef7 l\u1ec7 s\u1ee9c m\u1ea1nh n\u0103ng su\u1ea5t<\/th><th>\u0110\u1ecbnh v\u1ecb \u0111i\u1ec3n h\u00ecnh<\/th><\/tr><\/thead><tbody><tr><td>8.8<\/td><td>Around 800 MPa<\/td><td>Kho\u1ea3ng 80%<\/td><td>S\u1eed d\u1ee5ng c\u01b0\u1eddng \u0111\u1ed9 cao n\u00f3i chung<\/td><\/tr><tr><td>10.9<\/td><td>Around 1000 MPa<\/td><td>Kho\u1ea3ng 90%<\/td><td>S\u1eed d\u1ee5ng \u1edf t\u1ea3i n\u1eb7ng v\u00e0 t\u1ea3i cao h\u01a1n<\/td><\/tr><tr><td>12.9<\/td><td>Around 1200 MPa<\/td><td>Kho\u1ea3ng 90%<\/td><td>S\u1ee9c m\u1ea1nh t\u1ed1i \u0111a trong c\u00e1c c\u1ee5m l\u1eafp r\u00e1p nh\u1ecf g\u1ecdn<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p>Nh\u1eefng s\u1ed1 li\u1ec7u n\u00e0y r\u1ea5t h\u1eefu \u00edch \u0111\u1ec3 hi\u1ec3u s\u1ef1 kh\u00e1c bi\u1ec7t v\u1ec1 c\u1ea5p \u0111\u1ed9, nh\u01b0ng vi\u1ec7c l\u1ef1a ch\u1ecdn cu\u1ed1i c\u00f9ng ph\u1ea3i lu\u00f4n tu\u00e2n theo ti\u00eau chu\u1ea9n, b\u1ea3n v\u1ebd, th\u00f4ng s\u1ed1 k\u1ef9 thu\u1eadt c\u1ee7a d\u1ef1 \u00e1n v\u00e0 t\u00ednh to\u00e1n k\u1ef9 thu\u1eadt hi\u1ec7n h\u00e0nh.<\/p>\n\n\n\n<p>Khi xem x\u00e9t <a href=\"https:\/\/xzfastener.com\/vi\/products-category\/high-strength-fasteners\/\">\u1ed1c v\u00edt c\u01b0\u1eddng \u0111\u1ed9 cao<\/a>, ng\u01b0\u1eddi mua kh\u00f4ng n\u00ean \u0111\u00e1nh gi\u00e1 l\u1edbp m\u1ed9t m\u00ecnh. Y\u00eau c\u1ea7u \u0111\u1ea7y \u0111\u1ee7 ph\u1ea3i bao g\u1ed3m lo\u1ea1i bu l\u00f4ng, ti\u00eau chu\u1ea9n, \u0111\u01b0\u1eddng k\u00ednh, chi\u1ec1u d\u00e0i, ren, v\u1eadt li\u1ec7u, l\u1edbp ph\u1ee7, c\u1ea5p \u0111ai \u1ed1c, \u0111\u1ed9 c\u1ee9ng c\u1ee7a v\u00f2ng \u0111\u1ec7m, ch\u1ee9ng ch\u1ec9 v\u00e0 m\u00f4i tr\u01b0\u1eddng l\u00e0m vi\u1ec7c.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">2. Bu l\u00f4ng c\u1ea5p 8.8: C\u00f4ng c\u1ee5 th\u1ef1c t\u1ebf<\/h2>\n\n\n\n<p>Bu l\u00f4ng c\u1ea5p 8.8 \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng r\u1ed9ng r\u00e3i v\u00ec ch\u00fang mang l\u1ea1i s\u1ef1 c\u00e2n b\u1eb1ng t\u1ed1t gi\u1eefa \u0111\u1ed9 b\u1ec1n, \u0111\u1ed9 d\u1ebbo, t\u00ednh s\u1eb5n c\u00f3 v\u00e0 chi ph\u00ed. Ch\u00fang ph\u1ed5 bi\u1ebfn trong m\u00e1y m\u00f3c, khung th\u00e9p, gi\u00e1 \u0111\u1ee1, ph\u1ee5 t\u00f9ng \u00f4 t\u00f4, k\u1ebft n\u1ed1i x\u00e2y d\u1ef1ng, c\u01a1 s\u1edf thi\u1ebft b\u1ecb v\u00e0 l\u1eafp r\u00e1p c\u00f4ng nghi\u1ec7p n\u00f3i chung.<\/p>\n\n\n\n<p>\u0110\u1ed1i v\u1edbi nhi\u1ec1u d\u1ef1 \u00e1n, C\u1ea5p 8.8 \u0111\u1ee7 m\u1ea1nh v\u00e0 d\u1ec5 tha th\u1ee9 h\u01a1n trong qu\u00e1 tr\u00ecnh l\u1eafp \u0111\u1eb7t so v\u1edbi c\u00e1c c\u1ea5p cao h\u01a1n. N\u00f3 c\u00f3 th\u1ec3 x\u1eed l\u00fd t\u1ea3i tr\u1ecdng \u0111\u00e1ng k\u1ec3 trong khi v\u1eabn cung c\u1ea5p \u0111\u1ed9 d\u1ebbo t\u1ed1t h\u01a1n 10.9 v\u00e0 12.9 trong nhi\u1ec1u \u1ee9ng d\u1ee5ng. \u0110i\u1ec1u n\u00e0y l\u00e0m cho n\u00f3 tr\u1edf th\u00e0nh m\u1ed9t l\u1ef1a ch\u1ecdn thi\u1ebft th\u1ef1c khi m\u1ed1i n\u1ed1i kh\u00f4ng y\u00eau c\u1ea7u t\u1ea3i tr\u1ecdng k\u1eb9p t\u1ed1i \u0111a ho\u1eb7c \u0111\u1ed9 b\u1ec1n c\u1ef1c k\u1ef3 nh\u1ecf g\u1ecdn.<\/p>\n\n\n\n<p>C\u00e1c \u1ee9ng d\u1ee5ng \u0111i\u1ec3n h\u00ecnh bao g\u1ed3m:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>L\u1eafp r\u00e1p m\u00e1y m\u00f3c t\u1ed5ng h\u1ee3p<\/li>\n\n\n\n<li>K\u1ebft n\u1ed1i th\u1ee9 c\u1ea5p k\u1ebft c\u1ea5u th\u00e9p<\/li>\n\n\n\n<li>G\u1eafn thi\u1ebft b\u1ecb<\/li>\n\n\n\n<li>D\u1ea5u ngo\u1eb7c x\u00e2y d\u1ef1ng<\/li>\n\n\n\n<li>M\u00e1y m\u00f3c n\u00f4ng nghi\u1ec7p<\/li>\n\n\n\n<li>C\u00e1c b\u1ed9 ph\u1eadn n\u1eb7ng kh\u00f4ng quan tr\u1ecdng c\u1ee7a \u00f4 t\u00f4<\/li>\n<\/ul>\n\n\n\n<p>\u0110\u1ed1i v\u1edbi ng\u01b0\u1eddi mua t\u00ecm ngu\u1ed3n cung \u1ee9ng <a href=\"https:\/\/xzfastener.com\/vi\/fastener-type\/bolts\/\">bu l\u00f4ng c\u00f4ng nghi\u1ec7p<\/a>, L\u1edbp 8.8 th\u01b0\u1eddng l\u00e0 l\u1edbp \u0111\u1ea7u ti\u00ean c\u1ea7n c\u00e2n nh\u1eafc khi b\u1ea3n v\u1ebd y\u00eau c\u1ea7u c\u01b0\u1eddng \u0111\u1ed9 cao nh\u01b0ng kh\u00f4ng y\u00eau c\u1ea7u t\u1ea3i tr\u01b0\u1edbc qu\u00e1 cao ho\u1eb7c thi\u1ebft k\u1ebf kh\u00f4ng gian h\u1ea1n ch\u1ebf.<\/p>\n\n\n\n<p>Sai l\u1ea7m ch\u00ednh l\u00e0 cho r\u1eb1ng 8.8 l\u00e0 \u201cb\u00ecnh th\u01b0\u1eddng\u201d hay \u201cy\u1ebfu\u201d. N\u00f3 \u0111\u00e3 l\u00e0 lo\u1ea1i c\u00f3 \u0111\u1ed9 b\u1ec1n cao cho nhi\u1ec1u \u1ee9ng d\u1ee5ng c\u00f4ng nghi\u1ec7p. Vi\u1ec7c thay th\u1ebf n\u00f3 b\u1eb1ng 10.9 ho\u1eb7c 12.9 m\u00e0 kh\u00f4ng ki\u1ec3m tra thi\u1ebft k\u1ebf chung c\u00f3 th\u1ec3 l\u00e0m t\u0103ng chi ph\u00ed v\u00e0 r\u1ee7i ro l\u1eafp \u0111\u1eb7t m\u00e0 kh\u00f4ng c\u1ea3i thi\u1ec7n hi\u1ec7u su\u1ea5t th\u1ef1c t\u1ebf.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">3. Bu l\u00f4ng c\u1ea5p 10.9: \u0110\u1ed9 b\u1ec1n cao h\u01a1n cho t\u1ea3i tr\u1ecdng y\u00eau c\u1ea7u<\/h2>\n\n\n\n<p>Bu l\u00f4ng c\u1ea5p 10.9 \u0111\u01b0\u1ee3c ch\u1ecdn khi m\u1ed1i n\u1ed1i c\u1ea7n kh\u1ea3 n\u0103ng ch\u1ecbu k\u00e9o cao h\u01a1n, t\u1ea3i tr\u1ecdng k\u1eb9p cao h\u01a1n ho\u1eb7c hi\u1ec7u su\u1ea5t t\u1ed1t h\u01a1n d\u01b0\u1edbi \u00e1p l\u1ef1c c\u01a1 h\u1ecdc n\u1eb7ng. Ch\u00fang ph\u1ed5 bi\u1ebfn trong m\u00e1y m\u00f3c h\u1ea1ng n\u1eb7ng, khung g\u1ea7m \u00f4 t\u00f4, c\u00e1c c\u1ee5m li\u00ean quan \u0111\u1ebfn h\u1ec7 th\u1ed1ng treo, thi\u1ebft b\u1ecb x\u00e2y d\u1ef1ng, thi\u1ebft b\u1ecb khai th\u00e1c m\u1ecf v\u00e0 c\u00e1c kh\u1edbp c\u01a1 kh\u00ed ch\u1ecbu t\u1ea3i.<\/p>\n\n\n\n<p>So v\u1edbi C\u1ea5p 8.8, bu l\u00f4ng 10.9 c\u00f3 th\u1ec3 ch\u1ecbu t\u1ea3i cao h\u01a1n, nh\u01b0ng ch\u00fang c\u00f3 \u0111\u1ed9 \u1ed5n \u0111\u1ecbnh k\u00e9m h\u01a1n. Ki\u1ec3m so\u00e1t m\u00f4-men xo\u1eafn ch\u00ednh x\u00e1c, l\u1ef1a ch\u1ecdn v\u00f2ng \u0111\u1ec7m, g\u1eafn ren v\u00e0 \u0111ai \u1ed1c ph\u00f9 h\u1ee3p tr\u1edf n\u00ean quan tr\u1ecdng h\u01a1n. N\u1ebfu bu l\u00f4ng \u0111\u01b0\u1ee3c si\u1ebft kh\u00f4ng \u0111\u00fang c\u00e1ch, kh\u1edbp v\u1eabn c\u00f3 th\u1ec3 b\u1ecb h\u1ecfng do kh\u00f4ng \u0111\u1ee7 t\u1ea3i tr\u01b0\u1edbc, si\u1ebft qu\u00e1 ch\u1eb7t, h\u01b0 ren ho\u1eb7c m\u1ecfi.<\/p>\n\n\n\n<p>C\u1ea5p 10.9 ph\u00f9 h\u1ee3p khi:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Nhu c\u1ea7u t\u1ea3i r\u00f5 r\u00e0ng cao h\u01a1n c\u1ea5p c\u00f4ng su\u1ea5t (8.8)<\/li>\n\n\n\n<li>M\u1ed1i n\u1ed1i y\u00eau c\u1ea7u l\u1ef1c k\u1eb9p cao h\u01a1n<\/li>\n\n\n\n<li>Gi\u1edbi h\u1ea1n kh\u00f4ng gian ng\u0103n c\u1ea3n vi\u1ec7c s\u1eed d\u1ee5ng bu l\u00f4ng c\u00f3 \u0111\u01b0\u1eddng k\u00ednh l\u1edbn h\u01a1n<\/li>\n\n\n\n<li>B\u1ea3n v\u1ebd ho\u1eb7c th\u00f4ng s\u1ed1 k\u1ef9 thu\u1eadt y\u00eau c\u1ea7u r\u00f5 r\u00e0ng (10.9)<\/li>\n\n\n\n<li>Vi\u1ec7c l\u1eafp r\u00e1p ph\u1ea3i ch\u1ecbu rung \u0111\u1ed9ng ho\u1eb7c ch\u1ecbu t\u1ea3i c\u01a1 h\u1ecdc l\u1eb7p \u0111i l\u1eb7p l\u1ea1i<\/li>\n<\/ul>\n\n\n\n<p>\u0110\u1ed1i v\u1edbi c\u00e1c bu l\u00f4ng l\u1ee5c gi\u00e1c h\u1ec7 m\u00e9t nh\u01b0 DIN 931, DIN 933, ISO 4014, v\u00e0 ISO 4017, ng\u01b0\u1eddi mua n\u00ean x\u00e1c nh\u1eadn xem bu l\u00f4ng \u0111\u01b0\u1ee3c y\u00eau c\u1ea7u l\u00e0 ren to\u00e0n ph\u1ea7n hay ren m\u1ed9t ph\u1ea7n. Bu l\u00f4ng c\u00f3 ren m\u1ed9t ph\u1ea7n c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c \u01b0u ti\u00ean h\u01a1n khi th\u00e2n kh\u00f4ng c\u00f3 ren ch\u1ecbu l\u1ef1c c\u1eaft t\u1ed1t h\u01a1n tr\u00ean to\u00e0n b\u1ed9 chi\u1ec1u d\u00e0i tay c\u1ea7m. Bu l\u00f4ng to\u00e0n ren c\u00f3 th\u1ec3 d\u1ec5 d\u00e0ng h\u01a1n cho vi\u1ec7c qu\u1ea3n l\u00fd kho n\u00f3i chung nh\u01b0ng kh\u00f4ng ph\u1ea3i l\u00fac n\u00e0o c\u0169ng l\u00fd t\u01b0\u1edfng cho c\u00e1c m\u1ed1i n\u1ed1i nh\u1ea1y c\u1ea3m v\u1edbi l\u1ef1c c\u1eaft.<\/p>\n\n\n\n<p>N\u1ebfu d\u1ef1 \u00e1n li\u00ean quan \u0111\u1ebfn c\u00e1c l\u1ef1a ch\u1ecdn th\u00e9p cacbon ho\u1eb7c th\u00e9p h\u1ee3p kim, <a href=\"https:\/\/xzfastener.com\/vi\/fastener-material\/carbon-steel\/\">\u1ed1c v\u00edt th\u00e9p carbon<\/a> v\u1eabn l\u00e0 m\u1ed9t l\u1ed9 tr\u00ecnh th\u1ef1c t\u1ebf cho bu l\u00f4ng v\u00e0 10.9, \u0111\u1eb7c bi\u1ec7t khi k\u1ebft h\u1ee3p v\u1edbi x\u1eed l\u00fd nhi\u1ec7t v\u00e0 ho\u00e0n thi\u1ec7n b\u1ec1 m\u1eb7t ch\u00ednh x\u00e1c. (8.8)<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">4. Bu l\u00f4ng c\u1ea5p 12.9: S\u1ee9c m\u1ea1nh t\u1ed1i \u0111a, Tr\u00e1ch nhi\u1ec7m cao h\u01a1n<\/h2>\n\n\n\n<p>Bu l\u00f4ng c\u1ea5p 12.9 cung c\u1ea5p \u0111\u1ed9 b\u1ec1n k\u00e9o r\u1ea5t cao v\u00e0 th\u01b0\u1eddng \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng trong c\u00e1c c\u1ee5m c\u01a1 kh\u00ed nh\u1ecf g\u1ecdn, ch\u1ecbu t\u1ea3i cao, n\u01a1i kh\u00f4ng gian b\u1ecb h\u1ea1n ch\u1ebf v\u00e0 c\u1ea7n c\u00f3 l\u1ef1c k\u1eb9p m\u1ea1nh. Ch\u00fang th\u01b0\u1eddng th\u1ea5y trong c\u00e1c v\u00edt c\u00f3 n\u1eafp \u0111\u1ea7u \u1ed5 c\u1eafm, khu\u00f4n m\u1eabu, thi\u1ebft b\u1ecb ch\u00ednh x\u00e1c, d\u1ee5ng c\u1ee5, thi\u1ebft b\u1ecb th\u1ee7y l\u1ef1c, m\u00e1y c\u00f4ng c\u1ee5 v\u00e0 m\u1ed9t s\u1ed1 h\u1ec7 th\u1ed1ng c\u01a1 kh\u00ed hi\u1ec7u su\u1ea5t cao.<\/p>\n\n\n\n<p>Tuy nhi\u00ean, 12.9 kh\u00f4ng n\u00ean \u0111\u01b0\u1ee3c coi l\u00e0 m\u1ed9t b\u1ea3n n\u00e2ng c\u1ea5p ph\u1ed5 qu\u00e1t. N\u00f3 c\u00f3 \u00edt bi\u00ean \u0111\u1ed9 h\u01a1n khi l\u1eafp \u0111\u1eb7t k\u00e9m v\u00e0 c\u00f3 th\u1ec3 nh\u1ea1y c\u1ea3m h\u01a1n v\u1edbi vi\u1ec7c si\u1ebft qu\u00e1 ch\u1eb7t, m\u1ecfi, gi\u00f2n hydro v\u00e0 x\u1eed l\u00fd b\u1ec1 m\u1eb7t kh\u00f4ng \u0111\u00fang c\u00e1ch. Trong m\u1ed9t s\u1ed1 \u1ee9ng d\u1ee5ng, bu l\u00f4ng 10.9 l\u1edbn h\u01a1n ho\u1eb7c kh\u1edbp n\u1ed1i \u0111\u01b0\u1ee3c thi\u1ebft k\u1ebf l\u1ea1i c\u00f3 th\u1ec3 an to\u00e0n v\u00e0 \u1ed5n \u0111\u1ecbnh h\u01a1n so v\u1edbi vi\u1ec7c ch\u1ec9 ch\u1ecdn 12.9.<\/p>\n\n\n\n<p>C\u1ea5p 12.9 \u0111\u01b0\u1ee3c xem x\u00e9t t\u1ed1t nh\u1ea5t khi:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Thi\u1ebft k\u1ebf \u0111\u1eb7c bi\u1ec7t y\u00eau c\u1ea7u n\u00f3<\/li>\n\n\n\n<li>Kh\u00f4ng gian qu\u00e1 h\u1ea1n ch\u1ebf \u0111\u1ed1i v\u1edbi \u0111\u01b0\u1eddng k\u00ednh bu l\u00f4ng l\u1edbn h\u01a1n<\/li>\n\n\n\n<li>M\u1ed1i n\u1ed1i c\u1ea7n t\u1ea3i tr\u1ecdng k\u1eb9p cao trong khu v\u1ef1c nh\u1ecf g\u1ecdn<\/li>\n\n\n\n<li>M\u00f4-men xo\u1eafn l\u1eafp \u0111\u1eb7t c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c ki\u1ec3m so\u00e1t \u0111\u00fang c\u00e1ch<\/li>\n\n\n\n<li>M\u00f4i tr\u01b0\u1eddng v\u00e0 quy tr\u00ecnh ph\u1ee7 ph\u00f9 h\u1ee3p cho \u1ed1c v\u00edt c\u00f3 \u0111\u1ed9 b\u1ec1n cao<\/li>\n<\/ul>\n\n\n\n<p>\u0110\u1ed1i v\u1edbi m\u00f4i tr\u01b0\u1eddng ngo\u00e0i tr\u1eddi ho\u1eb7c \u0103n m\u00f2n, ng\u01b0\u1eddi mua n\u00ean th\u1eadn tr\u1ecdng. Nhi\u1ec1u bu l\u00f4ng \u0111\u01b0\u1ee3c cung c\u1ea5p d\u01b0\u1edbi d\u1ea1ng l\u1edbp ph\u1ee7 oxit \u0111en, ph\u1ed1t ph\u00e1t, tr\u01a1n ho\u1eb7c chuy\u00ean d\u1ee5ng t\u00f9y thu\u1ed9c v\u00e0o \u1ee9ng d\u1ee5ng. R\u1ee7i ro m\u1ea1 \u0111i\u1ec7n v\u00e0 gi\u00f2n hydro ti\u00eau chu\u1ea9n ph\u1ea3i \u0111\u01b0\u1ee3c xem x\u00e9t c\u1ea9n th\u1eadn \u0111\u1ed1i v\u1edbi c\u00e1c bu l\u00f4ng c\u00f3 \u0111\u1ed9 b\u1ec1n r\u1ea5t cao. N\u1ebfu kh\u1ea3 n\u0103ng ch\u1ed1ng \u0103n m\u00f2n l\u00e0 quan tr\u1ecdng th\u00ec l\u1edbp ph\u1ee7 ph\u1ea3i \u0111\u01b0\u1ee3c l\u1ef1a ch\u1ecdn v\u1edbi s\u1ef1 ph\u00ea duy\u1ec7t k\u1ef9 thu\u1eadt thay v\u00ec ch\u1ec9 ch\u1ecdn v\u1ec1 h\u00ecnh th\u1ee9c b\u00ean ngo\u00e0i. (12.9)<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">5. 8.8 vs 10.9 vs 12.9: C\u00e1ch ch\u1ecdn<\/h2>\n\n\n\n<p>M\u1ed9t ph\u01b0\u01a1ng ph\u00e1p l\u1ef1a ch\u1ecdn h\u1eefu \u00edch l\u00e0 b\u1eaft \u0111\u1ea7u t\u1eeb m\u1ed1i n\u1ed1i ch\u1ee9 kh\u00f4ng ph\u1ea3i c\u1ea5p \u0111\u1ed9 bu l\u00f4ng.<\/p>\n\n\n\n<p>\u0110\u1ea7u ti\u00ean, h\u00e3y ki\u1ec3m tra t\u1ea3i. N\u1ebfu C\u1ea5p 8.8 cung c\u1ea5p \u0111\u1ee7 kh\u1ea3 n\u0103ng ch\u1ecbu k\u00e9o v\u00e0 c\u1eaft v\u1edbi h\u1ec7 s\u1ed1 an to\u00e0n h\u1ee3p l\u00fd th\u00ec vi\u1ec7c n\u00e2ng c\u1ea5p c\u00f3 th\u1ec3 kh\u00f4ng c\u1ea7n thi\u1ebft. N\u1ebfu m\u1ed1i n\u1ed1i y\u00eau c\u1ea7u t\u1ea3i tr\u01b0\u1edbc cao h\u01a1n ho\u1eb7c t\u1ea3i v\u01b0\u1ee3t qu\u00e1 kh\u1ea3 n\u0103ng ch\u1ecbu \u0111\u1ef1ng, 10.9 c\u00f3 th\u1ec3 l\u00e0 l\u1ef1a ch\u1ecdn th\u1ef1c t\u1ebf ti\u1ebfp theo. N\u1ebfu c\u1ee5m l\u1eafp r\u00e1p nh\u1ecf g\u1ecdn v\u00e0 c\u1ea7n \u0111\u1ed9 b\u1ec1n t\u1ed1i \u0111a, 12.9 c\u00f3 th\u1ec3 ph\u00f9 h\u1ee3p, nh\u01b0ng ch\u1ec9 v\u1edbi vi\u1ec7c l\u1eafp \u0111\u1eb7t \u0111\u01b0\u1ee3c ki\u1ec3m so\u00e1t.<\/p>\n\n\n\n<p>Th\u1ee9 hai, ki\u1ec3m tra v\u1eadt li\u1ec7u c\u01a1 b\u1ea3n. M\u1ed9t bu l\u00f4ng \u0111\u01b0\u1ee3c l\u1eafp v\u00e0o gang y\u1ebfu, nh\u00f4m, th\u00e9p m\u1ecfng ho\u1eb7c v\u1eadt li\u1ec7u ren c\u00f3 \u0111\u1ed9 b\u1ec1n th\u1ea5p c\u00f3 th\u1ec3 l\u00e0m h\u1ecfng ren trong tr\u01b0\u1edbc khi bu l\u00f4ng \u0111\u1ea1t \u0111\u01b0\u1ee3c hi\u1ec7u qu\u1ea3 mong mu\u1ed1n. C\u00e1c b\u1ed9 ph\u1eadn \u0111\u01b0\u1ee3c k\u1ebft n\u1ed1i ph\u1ea3i \u0111\u1ee7 ch\u1eafc ch\u1eafn \u0111\u1ec3 c\u00f3 th\u1ec3 s\u1eed d\u1ee5ng bu l\u00f4ng c\u01b0\u1eddng \u0111\u1ed9 cao. (12.9)<\/p>\n\n\n\n<p>Th\u1ee9 ba, ki\u1ec3m tra m\u00f4-men xo\u1eafn v\u00e0 t\u1ea3i tr\u01b0\u1edbc. Bu l\u00f4ng c\u1ea5p cao h\u01a1n th\u01b0\u1eddng y\u00eau c\u1ea7u si\u1ebft ch\u1eb7t c\u1ea9n th\u1eadn h\u01a1n. Gi\u00e1 tr\u1ecb m\u00f4men xo\u1eafn kh\u00f4ng ch\u1ec9 ph\u1ee5 thu\u1ed9c v\u00e0o c\u1ea5p \u0111\u1ed9 bu l\u00f4ng m\u00e0 c\u00f2n ph\u1ee5 thu\u1ed9c v\u00e0o ma s\u00e1t, l\u1edbp ph\u1ee7, ch\u1ea5t b\u00f4i tr\u01a1n, b\u1ec1 m\u1eb7t v\u00f2ng \u0111\u1ec7m v\u00e0 t\u00ecnh tr\u1ea1ng ren. Ng\u01b0\u1eddi mua kh\u00f4ng bao gi\u1edd n\u00ean cho r\u1eb1ng m\u1ed9t bi\u1ec3u \u0111\u1ed3 m\u00f4-men xo\u1eafn \u00e1p d\u1ee5ng cho t\u1ea5t c\u1ea3 c\u00e1c l\u1edbp ho\u00e0n thi\u1ec7n v\u00e0 t\u1ea5t c\u1ea3 c\u00e1c nh\u00e0 cung c\u1ea5p.<\/p>\n\n\n\n<p>Th\u1ee9 t\u01b0, ki\u1ec3m tra \u0111ai \u1ed1c v\u00e0 v\u00f2ng \u0111\u1ec7m. Bu l\u00f4ng c\u01b0\u1eddng \u0111\u1ed9 cao ph\u1ea3i \u0111\u01b0\u1ee3c k\u1ebft h\u1ee3p v\u1edbi c\u00e1c \u0111ai \u1ed1c v\u00e0 v\u00f2ng \u0111\u1ec7m t\u01b0\u01a1ng th\u00edch. S\u1eed d\u1ee5ng \u0111ai \u1ed1c ch\u1ea5t l\u01b0\u1ee3ng th\u1ea5p c\u00f3 ch\u1ed1t 10.9 ho\u1eb7c 12.9 c\u00f3 th\u1ec3 g\u00e2y ra hi\u1ec7n t\u01b0\u1ee3ng tu\u1ed9t ren. S\u1eed d\u1ee5ng v\u00f2ng \u0111\u1ec7m m\u1ec1m d\u01b0\u1edbi bu l\u00f4ng c\u01b0\u1eddng \u0111\u1ed9 cao c\u00f3 th\u1ec3 gi\u1ea3m t\u1ea3i k\u1eb9p sau khi si\u1ebft ch\u1eb7t. \u0110\u1ed1i v\u1edbi c\u00e1c c\u1ee5m l\u1eafp r\u00e1p c\u00f3 v\u1ea5n \u0111\u1ec1 v\u1ec1 ph\u00e2n b\u1ed5 t\u1ea3i, h\u00e3y ch\u1ecdn \u0111\u00fang <a href=\"https:\/\/xzfastener.com\/vi\/fastener-type\/washers\/\">v\u00f2ng \u0111\u1ec7m c\u00f4ng nghi\u1ec7p<\/a> l\u00e0 m\u1ed9t ph\u1ea7n c\u1ee7a h\u1ec7 th\u1ed1ng bu\u1ed9c ch\u1eb7t, kh\u00f4ng ph\u1ea3i l\u00e0 m\u1ed9t suy ngh\u0129 l\u1ea1i.<\/p>\n\n\n\n<p>Th\u1ee9 n\u0103m, ki\u1ec3m tra vi\u1ec7c x\u1eed l\u00fd b\u1ec1 m\u1eb7t. M\u1ea1 k\u1ebdm, oxit \u0111en, m\u1ea1 k\u1ebdm nh\u00fang n\u00f3ng, m\u1ea1 k\u1ebdm, m\u1ea1 k\u1ebdm, ph\u1ed1t ph\u00e1t v\u00e0 s\u01a1n ph\u1ee7 \u0111\u1ec1u \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn kh\u1ea3 n\u0103ng ch\u1ed1ng \u0103n m\u00f2n, ma s\u00e1t, h\u00ecnh th\u1ee9c b\u00ean ngo\u00e0i v\u00e0 ho\u1ea1t \u0111\u1ed9ng l\u1eafp r\u00e1p. \u0110\u1ed1i v\u1edbi c\u00e1c \u1ee9ng d\u1ee5ng ngo\u00e0i tr\u1eddi, (PTFE) <a href=\"https:\/\/xzfastener.com\/vi\/fastener-coating\/hot-dip-galvanizing\/\">\u1ed1c v\u00edt m\u1ea1 k\u1ebdm nh\u00fang n\u00f3ng<\/a> c\u00f3 th\u1ec3 ph\u00f9 h\u1ee3p v\u1edbi c\u00e1c c\u1ea5p v\u00e0 ti\u00eau chu\u1ea9n nh\u1ea5t \u0111\u1ecbnh, nh\u01b0ng ph\u1ea3i \u0111\u00e1nh gi\u00e1 \u0111\u1ed9 d\u00e0y l\u1edbp ph\u1ee7, \u0111\u1ed9 v\u1eeba v\u1eb7n c\u1ee7a ren v\u00e0 nguy c\u01a1 gi\u00f2n. \u0110\u1ec3 l\u1eafp r\u00e1p m\u01b0\u1ee3t m\u00e0 h\u01a1n ho\u1eb7c m\u00f4i tr\u01b0\u1eddng h\u00f3a h\u1ecdc \u0111\u1eb7c bi\u1ec7t, <a href=\"https:\/\/xzfastener.com\/vi\/fastener-coating\/teflon-coating\/\">\u1ed0c v\u00edt ph\u1ee7 Teflon<\/a> c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c xem x\u00e9t, nh\u01b0ng gi\u00e1 tr\u1ecb m\u00f4-men xo\u1eafn ph\u1ea3i \u0111\u01b0\u1ee3c \u0111i\u1ec1u ch\u1ec9nh cho b\u1ec1 m\u1eb7t ma s\u00e1t th\u1ea5p h\u01a1n.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">6. V\u00ed d\u1ee5 v\u1ec1 l\u1ef1a ch\u1ecdn d\u1ef1a tr\u00ean \u1ee9ng d\u1ee5ng<\/h2>\n\n\n\n<p>\u0110\u1ed1i v\u1edbi m\u00e1y m\u00f3c th\u00f4ng th\u01b0\u1eddng v\u00e0 thi\u1ebft b\u1ecb nh\u00e0 x\u01b0\u1edfng, bu l\u00f4ng c\u1ea5p 8.8 th\u01b0\u1eddng l\u00e0 \u0111\u1ee7 tr\u1eeb khi thi\u1ebft k\u1ebf m\u00e1y c\u00f3 quy \u0111\u1ecbnh kh\u00e1c. Ch\u00fang c\u00f3 \u0111\u1ed9 b\u1ec1n t\u1ed1t v\u00e0 d\u1ec5 qu\u1ea3n l\u00fd h\u01a1n trong c\u00e1c \u0111\u01a1n \u0111\u1eb7t h\u00e0ng c\u00f3 quy m\u00f4 h\u1ed7n h\u1ee3p.<\/p>\n\n\n\n<p>\u0110\u1ed1i v\u1edbi m\u00e1y m\u00f3c h\u1ea1ng n\u1eb7ng, c\u00e1c b\u1ed9 ph\u1eadn khung g\u1ea7m xe, thi\u1ebft b\u1ecb li\u00ean quan \u0111\u1ebfn n\u00e2ng h\u1ea1, m\u00e1y khai th\u00e1c m\u1ecf v\u00e0 c\u1ee5m t\u1ea3i tr\u1ecdng \u0111\u1ed9ng, C\u1ea5p \u0111\u1ed9 10.9 th\u01b0\u1eddng \u0111\u01b0\u1ee3c xem x\u00e9t v\u00ec m\u1ed1i n\u1ed1i c\u00f3 th\u1ec3 y\u00eau c\u1ea7u t\u1ea3i k\u1eb9p cao h\u01a1n v\u00e0 d\u1ef1 tr\u1eef c\u01b0\u1eddng \u0111\u1ed9 t\u1ed1t h\u01a1n.<\/p>\n\n\n\n<p>\u0110\u1ed1i v\u1edbi m\u00e1y m\u00f3c ch\u00ednh x\u00e1c, khu\u00f4n m\u1eabu, d\u1ee5ng c\u1ee5, c\u1ee5m c\u01a1 kh\u00ed nh\u1ecf g\u1ecdn v\u00e0 c\u00e1c \u1ee9ng d\u1ee5ng v\u00edt c\u00f3 n\u1eafp \u0111\u1ea7u \u1ed5 c\u1eafm, C\u1ea5p \u0111\u1ed9 12.9 c\u00f3 th\u1ec3 ph\u00f9 h\u1ee3p khi kh\u00f4ng gian b\u1ecb h\u1ea1n ch\u1ebf v\u00e0 ng\u01b0\u1eddi thi\u1ebft k\u1ebf c\u1ea7n \u0111\u1ed9 b\u1ec1n t\u1ed1i \u0111a t\u1eeb m\u1ed9t bu l\u00f4ng nh\u1ecf h\u01a1n.<\/p>\n\n\n\n<p>\u0110\u1ed1i v\u1edbi c\u00e1c k\u1ebft n\u1ed1i k\u1ebft c\u1ea5u th\u00e9p, ng\u01b0\u1eddi mua kh\u00f4ng n\u00ean ch\u1ec9 y\u00eau c\u1ea7u \u201c12.9 bu l\u00f4ng c\u01b0\u1eddng \u0111\u1ed9 cao\u201d. Vi\u1ec7c b\u1eaft v\u00edt k\u1ebft c\u1ea5u th\u01b0\u1eddng tu\u00e2n theo c\u00e1c ti\u00eau chu\u1ea9n, quy tr\u00ecnh l\u1eafp \u0111\u1eb7t v\u00e0 y\u00eau c\u1ea7u ki\u1ec3m tra c\u1ee5 th\u1ec3. ASTM, EN, DIN ho\u1eb7c c\u00e1c ti\u00eau chu\u1ea9n d\u00e0nh ri\u00eang cho d\u1ef1 \u00e1n c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c \u00e1p d\u1ee5ng v\u00e0 lo\u1ea1i bu l\u00f4ng k\u1ebft c\u1ea5u ch\u00ednh x\u00e1c quan tr\u1ecdng h\u01a1n vi\u1ec7c ch\u1ecdn c\u1ea5p h\u1ec7 m\u00e9t cao nh\u1ea5t.<\/p>\n\n\n\n<p>\u0110\u1ed1i v\u1edbi c\u00f4ng tr\u00ecnh x\u00e2y d\u1ef1ng ngo\u00e0i tr\u1eddi ho\u1eb7c c\u01a1 s\u1edf h\u1ea1 t\u1ea7ng, kh\u1ea3 n\u0103ng ch\u1ed1ng \u0103n m\u00f2n c\u00f3 th\u1ec3 quan tr\u1ecdng nh\u01b0 \u0111\u1ed9 b\u1ec1n. M\u1ed9t bu l\u00f4ng 8.8 ho\u1eb7c 10.9 \u0111\u01b0\u1ee3c ph\u1ee7 \u0111\u00fang c\u00e1ch c\u00f3 th\u1ec3 ho\u1ea1t \u0111\u1ed9ng t\u1ed1t h\u01a1n khi s\u1eed d\u1ee5ng so v\u1edbi m\u1ed9t bu l\u00f4ng ch\u1eafc ch\u1eafn h\u01a1n v\u1edbi l\u1edbp ph\u1ee7 kh\u00f4ng ph\u00f9 h\u1ee3p.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">7. Danh s\u00e1ch ki\u1ec3m tra mua s\u1eafm bu l\u00f4ng c\u01b0\u1eddng \u0111\u1ed9 cao<\/h2>\n\n\n\n<p>M\u1ed9t RFQ ho\u00e0n ch\u1ec9nh n\u00ean bao g\u1ed3m:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Lo\u1ea1i s\u1ea3n ph\u1ea9m: bu l\u00f4ng l\u1ee5c gi\u00e1c, v\u00edt n\u1eafp \u0111\u1ea7u \u1ed5 c\u1eafm, bu l\u00f4ng m\u1eb7t b\u00edch, bu l\u00f4ng \u0111inh t\u00e1n, bu l\u00f4ng neo<\/li>\n\n\n\n<li>Ti\u00eau chu\u1ea9n: DIN 931, DIN 933, ISO 4014, ISO 4017, DIN 912, ASTM, EN, ho\u1eb7c b\u1ea3n v\u1ebd<\/li>\n\n\n\n<li>K\u00edch th\u01b0\u1edbc: \u0111\u01b0\u1eddng k\u00ednh, chi\u1ec1u d\u00e0i, b\u01b0\u1edbc ren, ren to\u00e0n ph\u1ea7n ho\u1eb7c ren m\u1ed9t ph\u1ea7n<\/li>\n\n\n\n<li>C\u1ea5p \u0111\u1ed9: 8.8, 10.9, 12.9, ho\u1eb7c y\u00eau c\u1ea7u c\u1ee5 th\u1ec3 c\u1ee7a d\u1ef1 \u00e1n<\/li>\n\n\n\n<li>Ch\u1ea5t li\u1ec7u: th\u00e9p carbon, th\u00e9p h\u1ee3p kim ho\u1eb7c lo\u1ea1i th\u00e9p \u0111\u01b0\u1ee3c ch\u1ec9 \u0111\u1ecbnh<\/li>\n\n\n\n<li>B\u1ec1 m\u1eb7t ho\u00e0n thi\u1ec7n: oxit \u0111en, m\u1ea1 k\u1ebdm, HDG, Dacromet, k\u1ebdm-nh\u00f4m, ph\u1ed1t ph\u00e1t, PTFE, tr\u01a1n<\/li>\n\n\n\n<li>C\u00e1c b\u1ed9 ph\u1eadn ph\u00f9 h\u1ee3p: c\u1ea5p \u0111ai \u1ed1c, \u0111\u1ed9 c\u1ee9ng c\u1ee7a v\u00f2ng \u0111\u1ec7m, v\u00f2ng \u0111\u1ec7m kh\u00f3a, v\u00f2ng \u0111\u1ec7m ph\u1eb3ng<\/li>\n\n\n\n<li>C\u00e1c ch\u1ee9ng ch\u1ec9: MTC, b\u00e1o c\u00e1o ki\u1ec3m tra, ki\u1ec3m tra \u0111\u1ed9 c\u1ee9ng, b\u00e1o c\u00e1o l\u1edbp ph\u1ee7, EN 10204 3.1 n\u1ebfu \u0111\u01b0\u1ee3c y\u00eau c\u1ea7u<\/li>\n\n\n\n<li>\u1ee8ng d\u1ee5ng: m\u00e1y m\u00f3c, k\u1ebft c\u1ea5u th\u00e9p, \u00f4 t\u00f4, ngo\u00e0i tr\u1eddi, \u0111\u1ed9 rung, nhi\u1ec7t \u0111\u1ed9 cao, ti\u1ebfp x\u00fac v\u1edbi h\u00f3a ch\u1ea5t<\/li>\n\n\n\n<li>Bao b\u00ec: tr\u1ecdng l\u01b0\u1ee3ng th\u00f9ng carton, y\u00eau c\u1ea7u v\u1ec1 pallet, nh\u00e3n m\u00e1c, \u0111\u00e1nh d\u1ea5u l\u00f4 h\u00e0ng, ch\u1ee9ng t\u1eeb xu\u1ea5t kh\u1ea9u<\/li>\n<\/ul>\n\n\n\n<p>Ng\u01b0\u1eddi mua c\u0169ng c\u00f3 th\u1ec3 tham kh\u1ea3o <a href=\"https:\/\/xzfastener.com\/vi\/how-to-choose-the-right-bolt-grade-for-your-project\/\">L\u00e0m th\u1ebf n\u00e0o \u0111\u1ec3 ch\u1ecdn lo\u1ea1i bu l\u00f4ng ph\u00f9 h\u1ee3p cho d\u1ef1 \u00e1n c\u1ee7a b\u1ea1n<\/a> khi chu\u1ea9n b\u1ecb c\u00e1c ti\u00eau chu\u1ea9n mua h\u00e0ng n\u1ed9i b\u1ed9 ho\u1eb7c c\u00e1c m\u1eabu nh\u00e0 cung c\u1ea5p. (RFQ)<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">T\u00f3m t\u1eaft c\u1ed1t l\u00f5i<\/h2>\n\n\n\n<p>C\u00e1c bu l\u00f4ng c\u1ea5p 8.8, 10.9, v\u00e0 12.9 kh\u00f4ng ch\u1ec9 \u0111\u01a1n gi\u1ea3n l\u00e0 \u201ct\u1ed1t, t\u1ed1t h\u01a1n, t\u1ed1t nh\u1ea5t\u201d. H\u1ecd l\u00e0 nh\u1eefng l\u1ef1a ch\u1ecdn k\u1ef9 thu\u1eadt kh\u00e1c nhau.<\/p>\n\n\n\n<p>L\u1edbp 8.8 l\u00e0 m\u1ed9t l\u1ef1a ch\u1ecdn c\u00f3 \u0111\u1ed9 b\u1ec1n cao thi\u1ebft th\u1ef1c cho m\u00e1y m\u00f3c n\u00f3i chung, x\u00e2y d\u1ef1ng v\u00e0 l\u1eafp r\u00e1p c\u00f4ng nghi\u1ec7p. C\u1ea5p 10.9 ph\u00f9 h\u1ee3p v\u1edbi t\u1ea3i n\u1eb7ng h\u01a1n, l\u1ef1c k\u1eb9p cao h\u01a1n v\u00e0 c\u00e1c \u1ee9ng d\u1ee5ng c\u01a1 kh\u00ed \u0111\u00f2i h\u1ecfi kh\u1eaft khe h\u01a1n. C\u1ea5p \u0111\u1ed9 12.9 mang l\u1ea1i \u0111\u1ed9 b\u1ec1n t\u1ed1i \u0111a cho c\u00e1c c\u1ee5m l\u1eafp r\u00e1p nh\u1ecf g\u1ecdn nh\u01b0ng y\u00eau c\u1ea7u ki\u1ec3m so\u00e1t ch\u1eb7t ch\u1ebd h\u01a1n vi\u1ec7c l\u1eafp \u0111\u1eb7t, l\u1edbp ph\u1ee7 v\u00e0 thi\u1ebft k\u1ebf m\u1ed1i n\u1ed1i.<\/p>\n\n\n\n<p>S\u1ef1 l\u1ef1a ch\u1ecdn ch\u00ednh x\u00e1c ph\u1ee5 thu\u1ed9c v\u00e0o t\u1ea3i tr\u1ecdng, h\u00ecnh d\u1ea1ng c\u1ee7a m\u1ed1i n\u1ed1i, v\u1eadt li\u1ec7u c\u01a1 b\u1ea3n, ki\u1ec3m so\u00e1t m\u00f4-men xo\u1eafn, m\u00f4i tr\u01b0\u1eddng \u0103n m\u00f2n, \u0111ai \u1ed1c v\u00e0 v\u00f2ng \u0111\u1ec7m ph\u00f9 h\u1ee3p c\u0169ng nh\u01b0 ti\u00eau chu\u1ea9n d\u1ef1 \u00e1n. Bu l\u00f4ng c\u01b0\u1eddng \u0111\u1ed9 cao ch\u1ec9 ho\u1ea1t \u0111\u1ed9ng t\u1ed1t khi to\u00e0n b\u1ed9 h\u1ec7 th\u1ed1ng bu\u1ed9c ch\u1eb7t \u0111\u01b0\u1ee3c ch\u1ec9 \u0111\u1ecbnh ch\u00ednh x\u00e1c.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">FAQ<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">1. C\u00f3 ph\u1ea3i H\u1ea1ng 12.9 lu\u00f4n t\u1ed1t h\u01a1n H\u1ea1ng 10.9?<\/h3>\n\n\n\n<p>Kh\u00f4ng. C\u1ea5p \u0111\u1ed9 12.9 c\u00f3 \u0111\u1ed9 b\u1ec1n cao h\u01a1n, nh\u01b0ng \u0111\u1ed9 \u1ed5n \u0111\u1ecbnh k\u00e9m h\u01a1n v\u00e0 c\u00f3 th\u1ec3 nh\u1ea1y c\u1ea3m h\u01a1n v\u1edbi c\u00e1c l\u1ed7i l\u1eafp \u0111\u1eb7t, \u0111\u1ed9 m\u1ecfi v\u00e0 c\u00e1c r\u1ee7i ro li\u00ean quan \u0111\u1ebfn l\u1edbp ph\u1ee7. C\u1ea5p 10.9 c\u00f3 th\u1ec3 an to\u00e0n h\u01a1n v\u00e0 thi\u1ebft th\u1ef1c h\u01a1n cho nhi\u1ec1u m\u1ed1i n\u1ed1i ch\u1ecbu t\u1ea3i n\u1eb7ng.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">2. T\u00f4i c\u00f3 th\u1ec3 thay th\u1ebf bu l\u00f4ng C\u1ea5p 8.8 b\u1eb1ng bu l\u00f4ng C\u1ea5p 10.9 kh\u00f4ng?<\/h3>\n\n\n\n<p>Ch\u1ec9 sau khi ki\u1ec3m tra thi\u1ebft k\u1ebf m\u1ed1i n\u1ed1i, c\u1ea5p \u0111ai \u1ed1c, \u0111\u1ed9 c\u1ee9ng c\u1ee7a v\u00f2ng \u0111\u1ec7m, y\u00eau c\u1ea7u v\u1ec1 m\u00f4-men xo\u1eafn v\u00e0 \u0111\u1ed9 b\u1ec1n v\u1eadt li\u1ec7u n\u1ec1n. Bu l\u00f4ng c\u1ea5p cao h\u01a1n kh\u00f4ng t\u1ef1 \u0111\u1ed9ng c\u1ea3i thi\u1ec7n k\u1ebft n\u1ed1i.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">3. S\u1ef1 kh\u00e1c bi\u1ec7t ch\u00ednh gi\u1eefa 8.8, 10.9, v\u00e0 12.9 l\u00e0 g\u00ec?<\/h3>\n\n\n\n<p>S\u1ef1 kh\u00e1c bi\u1ec7t ch\u00ednh l\u00e0 \u0111\u1ed9 b\u1ec1n c\u01a1 h\u1ecdc. 8.8 ph\u00f9 h\u1ee3p cho m\u1ee5c \u0111\u00edch s\u1eed d\u1ee5ng c\u01b0\u1eddng \u0111\u1ed9 cao th\u00f4ng th\u01b0\u1eddng, 10.9 cho t\u1ea3i n\u1eb7ng h\u01a1n, v\u00e0 12.9 cho c\u01b0\u1eddng \u0111\u1ed9 t\u1ed1i \u0111a trong c\u00e1c c\u1ee5m l\u1eafp r\u00e1p nh\u1ecf g\u1ecdn ho\u1eb7c ch\u00ednh x\u00e1c.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">4. Bu l\u00f4ng c\u01b0\u1eddng \u0111\u1ed9 cao c\u00f3 c\u1ea7n \u0111ai \u1ed1c \u0111\u1eb7c bi\u1ec7t kh\u00f4ng?<\/h3>\n\n\n\n<p>V\u00e2ng. C\u1ea5p \u0111ai \u1ed1c ph\u1ea3i ph\u00f9 h\u1ee3p v\u1edbi c\u1ea5p bu l\u00f4ng v\u00e0 \u1ee9ng d\u1ee5ng. \u0110ai \u1ed1c c\u00f3 \u0111\u1ed9 b\u1ec1n th\u1ea5p \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng c\u00f9ng v\u1edbi bu l\u00f4ng c\u00f3 \u0111\u1ed9 b\u1ec1n cao c\u00f3 th\u1ec3 b\u1ecb bong ra tr\u01b0\u1edbc khi bu l\u00f4ng \u0111\u1ea1t t\u1ea3i tr\u1ecdng y\u00eau c\u1ea7u.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">5. L\u1edbp ph\u1ee7 n\u00e0o t\u1ed1t nh\u1ea5t cho bu l\u00f4ng c\u01b0\u1eddng \u0111\u1ed9 cao?<\/h3>\n\n\n\n<p>N\u00f3 ph\u1ee5 thu\u1ed9c v\u00e0o m\u00f4i tr\u01b0\u1eddng v\u00e0 c\u1ea5p \u0111\u1ed9. Oxit \u0111en v\u00e0 ph\u1ed1t ph\u00e1t l\u00e0 ph\u1ed5 bi\u1ebfn cho m\u00e1y m\u00f3c trong nh\u00e0. M\u1ea1 k\u1ebdm l\u00e0 ph\u1ed5 bi\u1ebfn \u0111\u1ec3 b\u1ea3o v\u1ec7 ch\u1ed1ng \u0103n m\u00f2n n\u00f3i chung. C\u00e1c l\u1edbp ph\u1ee7 m\u1ea1 k\u1ebdm nh\u00fang n\u00f3ng, nh\u00f4m k\u1ebdm ho\u1eb7c nh\u00f4m c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng cho c\u00e1c \u1ee9ng d\u1ee5ng \u0111\u1eb7c bi\u1ec7t, nh\u01b0ng bu l\u00f4ng c\u01b0\u1eddng \u0111\u1ed9 cao \u0111\u00f2i h\u1ecfi ph\u1ea3i ch\u00fa \u00fd \u0111\u1ebfn \u0111\u1eb7c t\u00ednh gi\u00f2n v\u00e0 m\u00f4-men xo\u1eafn. (PTFE)<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">6. T\u00f4i n\u00ean y\u00eau c\u1ea7u nh\u1eefng ch\u1ee9ng ch\u1ec9 n\u00e0o cho bu l\u00f4ng c\u01b0\u1eddng \u0111\u1ed9 cao?<\/h3>\n\n\n\n<p>\u0110\u1ed1i v\u1edbi c\u00e1c \u0111\u01a1n h\u00e0ng quan tr\u1ecdng, h\u00e3y y\u00eau c\u1ea7u MTC, b\u00e1o c\u00e1o ki\u1ec3m tra k\u00edch th\u01b0\u1edbc, ki\u1ec3m tra \u0111\u1ed9 c\u1ee9ng, ki\u1ec3m tra l\u1edbp ph\u1ee7 v\u00e0 ch\u1ee9ng ch\u1ec9 3.1 n\u1ebfu d\u1ef1 \u00e1n y\u00eau c\u1ea7u. (EN 10204)<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Khuy\u1ebfn ngh\u1ecb cu\u1ed1i c\u00f9ng<\/h2>\n\n\n\n<p>Khi ch\u1ecdn bu l\u00f4ng c\u01b0\u1eddng \u0111\u1ed9 cao, kh\u00f4ng n\u00ean b\u1eaft \u0111\u1ea7u v\u1edbi lo\u1ea1i cao c\u1ea5p nh\u1ea5t. B\u1eaft \u0111\u1ea7u v\u1edbi t\u1ea3i tr\u1ecdng l\u00e0m vi\u1ec7c, thi\u1ebft k\u1ebf m\u1ed1i n\u1ed1i, v\u1eadt li\u1ec7u c\u1ee7a c\u00e1c b\u1ed9 ph\u1eadn \u0111\u01b0\u1ee3c k\u1ebft n\u1ed1i, m\u00f4i tr\u01b0\u1eddng, ph\u01b0\u01a1ng ph\u00e1p l\u1eafp \u0111\u1eb7t v\u00e0 y\u00eau c\u1ea7u ki\u1ec3m tra. Sau \u0111\u00f3 ch\u1ecdn lo\u1ea1i th\u1ea5p nh\u1ea5t \u0111\u00e1p \u1ee9ng y\u00eau c\u1ea7u k\u1ef9 thu\u1eadt m\u1ed9t c\u00e1ch an to\u00e0n v\u1edbi c\u00e1c \u0111ai \u1ed1c, v\u00f2ng \u0111\u1ec7m, l\u1edbp ph\u1ee7 v\u00e0 t\u00e0i li\u1ec7u ph\u00f9 h\u1ee3p.<\/p>\n\n\n\n<p>\u0110\u1ed1i v\u1edbi ng\u01b0\u1eddi mua c\u00f4ng nghi\u1ec7p, ph\u01b0\u01a1ng ph\u00e1p n\u00e0y gi\u00fap gi\u1ea3m chi ph\u00ed, tr\u00e1nh y\u00eau c\u1ea7u qu\u00e1 cao v\u1ec1 th\u00f4ng s\u1ed1 k\u1ef9 thu\u1eadt v\u00e0 gi\u1ea3m nguy c\u01a1 h\u1ecfng h\u00f3c t\u1ea1i hi\u1ec7n tr\u01b0\u1eddng. M\u1ed9t bu l\u00f4ng c\u00f3 \u0111\u1ed9 b\u1ec1n cao t\u1ed1t kh\u00f4ng ch\u1ec9 m\u1ea1nh h\u01a1n tr\u00ean gi\u1ea5y. N\u00f3 ph\u1ea3i ph\u00f9 h\u1ee3p v\u1edbi kh\u1edbp th\u1eadt n\u01a1i n\u00f3 s\u1ebd \u0111\u01b0\u1ee3c l\u1eafp \u0111\u1eb7t.<\/p>","protected":false},"excerpt":{"rendered":"<p>Introduction High-strength bolts are small components, but they often decide whether a steel structure, machine frame, vehicle assembly, lifting device, or industrial installation performs safely over time. For buyers and engineers, the difficult part is not simply finding a bolt with a higher number stamped on the head. The real challenge is choosing the right [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":6393,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[110],"tags":[],"class_list":["post-6392","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-product-knowledge"],"acf":[],"_links":{"self":[{"href":"https:\/\/xzfastener.com\/vi\/wp-json\/wp\/v2\/posts\/6392","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/xzfastener.com\/vi\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/xzfastener.com\/vi\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/xzfastener.com\/vi\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/xzfastener.com\/vi\/wp-json\/wp\/v2\/comments?post=6392"}],"version-history":[{"count":1,"href":"https:\/\/xzfastener.com\/vi\/wp-json\/wp\/v2\/posts\/6392\/revisions"}],"predecessor-version":[{"id":6394,"href":"https:\/\/xzfastener.com\/vi\/wp-json\/wp\/v2\/posts\/6392\/revisions\/6394"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/xzfastener.com\/vi\/wp-json\/wp\/v2\/media\/6393"}],"wp:attachment":[{"href":"https:\/\/xzfastener.com\/vi\/wp-json\/wp\/v2\/media?parent=6392"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/xzfastener.com\/vi\/wp-json\/wp\/v2\/categories?post=6392"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/xzfastener.com\/vi\/wp-json\/wp\/v2\/tags?post=6392"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}