{"id":6753,"date":"2021-04-22T12:36:05","date_gmt":"2021-04-22T04:36:05","guid":{"rendered":"https:\/\/xzfastener.com\/?p=6753"},"modified":"2026-06-22T12:37:55","modified_gmt":"2026-06-22T04:37:55","slug":"what-does-8-8-mean-on-a-bolt-buyers-guide","status":"publish","type":"post","link":"https:\/\/xzfastener.com\/vi\/what-does-8-8-mean-on-a-bolt-buyers-guide\/","title":{"rendered":"8.8 c\u00f3 ngh\u0129a l\u00e0 g\u00ec tr\u00ean m\u1ed9t Bolt? H\u01b0\u1edbng d\u1eabn ng\u01b0\u1eddi mua"},"content":{"rendered":"<p>Khi ng\u01b0\u1eddi mua nh\u00ecn th\u1ea5y ch\u1eef \u201c8.8\u201d tr\u00ean \u0111\u1ea7u bu l\u00f4ng, ng\u01b0\u1eddi ta d\u1ec5 l\u1ea7m t\u01b0\u1edfng \u0111\u00f3 ch\u1ec9 l\u00e0 nh\u00e3n hi\u1ec7u c\u1ee7a nh\u00e0 m\u00e1y. Kh\u00f4ng ph\u1ea3i v\u1eady. \u0110\u1ed1i v\u1edbi bu l\u00f4ng h\u1ec7 m\u00e9t, <strong>8.8 l\u00e0 m\u1ed9t l\u1edbp thu\u1ed9c t\u00ednh c\u01a1 h\u1ecdc<\/strong>. N\u00f3 cho b\u1ea1n bi\u1ebft m\u1ee9c \u0111\u1ed9 b\u1ec1n c\u1ee7a bu l\u00f4ng theo ti\u00eau chu\u1ea9n chi ti\u1ebft si\u1ebft ch\u1eb7t s\u1ed1 li\u1ec7u c\u00f3 li\u00ean quan.<\/p>\n\n\n\n<p>D\u1ea5u hi\u1ec7u n\u00e0y ph\u1ed5 bi\u1ebfn tr\u00ean c\u00e1c bu l\u00f4ng c\u00f4ng nghi\u1ec7p \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng trong m\u00e1y m\u00f3c, khung th\u00e9p, gi\u00e1 \u0111\u1ee1, \u0111\u1ebf thi\u1ebft b\u1ecb v\u00e0 c\u1ee5m x\u00e2y d\u1ef1ng.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">What 8.8 Means<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">Hai con s\u1ed1 \u0111\u01b0\u1ee3c gi\u1ea3i th\u00edch<\/h3>\n\n\n\n<p>N\u00f3i m\u1ed9t c\u00e1ch \u0111\u01a1n gi\u1ea3n, s\u1ed1 \u0111\u1ea7u ti\u00ean bi\u1ec3u th\u1ecb \u0111\u1ed9 b\u1ec1n k\u00e9o danh ngh\u0129a. S\u1ed1 th\u1ee9 hai cho th\u1ea5y t\u1ef7 l\u1ec7 n\u0103ng su\u1ea5t.<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>\u0110\u00e1nh d\u1ea5u<\/th><th>\u00dd ngh\u0129a<\/th><th>Gi\u00e1 tr\u1ecb th\u1ef1c t\u1ebf<\/th><\/tr><\/thead><tbody><tr><td>8<\/td><td>X\u1ea5p x\u1ec9. 800 \u0110\u1ed9 b\u1ec1n k\u00e9o danh ngh\u0129a MPa (800 MPa)<\/td><td>Cho bi\u1ebft m\u1ee9c \u0111\u1ed9 s\u1ee9c m\u1ea1nh c\u1ee7a bu l\u00f4ng<\/td><\/tr><tr><td>.8<\/td><td>T\u1ef7 l\u1ec7 n\u0103ng su\u1ea5t kho\u1ea3ng 0.8<\/td><td>X\u1ea5p x\u1ec9. S\u1ee9c m\u1ea1nh n\u0103ng su\u1ea5t 640 MPa<\/td><\/tr><tr><td>8.8<\/td><td>L\u1edbp thu\u1ed9c t\u00ednh s\u1ed1 li\u1ec7u<\/td><td>D\u00f9ng cho bu l\u00f4ng th\u00e9p cacbon ho\u1eb7c th\u00e9p h\u1ee3p kim<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p>V\u00ec v\u1eady, bu l\u00f4ng lo\u1ea1i 8.8 ch\u1eafc ch\u1eafn h\u01a1n c\u00e1c lo\u1ea1i \u1ed1c v\u00edt th\u00f4ng th\u01b0\u1eddng c\u1ea5p th\u1ea5p, nh\u01b0ng n\u00f3 kh\u00f4ng gi\u1ed1ng nh\u01b0 10.9 ho\u1eb7c 12.9. N\u00f3 c\u0169ng l\u00e0 <strong>kh\u00f4ng gi\u1ed1ng nh\u01b0 SAE L\u1edbp 8<\/strong>, thu\u1ed9c h\u1ec7 th\u1ed1ng chi ti\u1ebft si\u1ebft ch\u1eb7t inch.<\/p>\n\n\n\n<p>Ng\u01b0\u1eddi mua c\u00f3 th\u1ec3 xem x\u00e9t chung <a href=\"https:\/\/xzfastener.com\/vi\/fastener-type\/bolts\/\">s\u1ea3n ph\u1ea9m bu l\u00f4ng<\/a> v\u00e0 <a href=\"https:\/\/xzfastener.com\/vi\/products-category\/high-strength-fasteners\/\">\u1ed1c v\u00edt c\u01b0\u1eddng \u0111\u1ed9 cao<\/a> khi so s\u00e1nh c\u00e1c c\u1ea5p \u0111\u1ed9 s\u1ee9c m\u1ea1nh.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Bu l\u00f4ng \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u1edf \u0111\u00e2u (8.8)<\/h2>\n\n\n\n<p>Bu l\u00f4ng lo\u1ea1i 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 m\u1ea1nh m\u1ebd v\u1ec1 \u0111\u1ed9 b\u1ec1n, t\u00ednh s\u1eb5n c\u00f3 v\u00e0 chi ph\u00ed.<\/p>\n\n\n\n<p>C\u00e1c \u1ee9ng d\u1ee5ng ph\u1ed5 bi\u1ebfn bao g\u1ed3m:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Khung m\u00e1y m\u00f3c<\/li>\n\n\n\n<li>Gi\u00e1 \u0111\u1ee1 th\u00e9p<\/li>\n\n\n\n<li>C\u01a1 s\u1edf thi\u1ebft b\u1ecb<\/li>\n\n\n\n<li>Ph\u1ea7n c\u1ee9ng 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\u1ee5m c\u00f4ng nghi\u1ec7p t\u1ed5ng h\u1ee3p<\/li>\n\n\n\n<li>K\u1ebft n\u1ed1i k\u1ebft c\u1ea5u t\u1ea3i trung b\u00ecnh<\/li>\n<\/ul>\n\n\n\n<p>\u0110\u1ed1i v\u1edbi nhi\u1ec1u c\u00f4ng vi\u1ec7c c\u00f4ng nghi\u1ec7p ti\u00eau chu\u1ea9n, 8.8 l\u00e0 \u0111\u1ee7. \u0110\u1ed1i v\u1edbi c\u00e1c c\u1ee5m l\u1eafp r\u00e1p nh\u1ecf g\u1ecdn ho\u1eb7c t\u1ea3i tr\u1ecdng cao h\u01a1n, ng\u01b0\u1eddi mua c\u00f3 th\u1ec3 c\u1ea7n 10.9 ho\u1eb7c 12.9 thay th\u1ebf.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Ng\u01b0\u1eddi mua kh\u00f4ng n\u00ean th\u1eeba nh\u1eadn \u0111i\u1ec1u g\u00ec<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">8.8 Kh\u00f4ng \u0111\u1ecbnh ngh\u0129a m\u1ecdi th\u1ee9<\/h3>\n\n\n\n<p>M\u1ed9t c\u00e1i ch\u1ed1t \u0111\u01b0\u1ee3c \u0111\u00e1nh d\u1ea5u 8.8 ch\u1ec9 k\u1ec3 \u0111\u01b0\u1ee3c m\u1ed9t ph\u1ea7n c\u00e2u chuy\u1ec7n. N\u00f3 kh\u00f4ng x\u00e1c \u0111\u1ecbnh \u0111\u1eb7c \u0111i\u1ec3m k\u1ef9 thu\u1eadt \u0111\u1ea7y \u0111\u1ee7 c\u1ee7a s\u1ea3n ph\u1ea9m.<\/p>\n\n\n\n<p>B\u1ea1n v\u1eabn c\u1ea7n x\u00e1c nh\u1eadn:<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>RFQ M\u1ee5c<\/th><th>T\u1ea1i sao n\u00f3 quan tr\u1ecdng<\/th><\/tr><\/thead><tbody><tr><td>Ti\u00eau chu\u1ea9n<\/td><td>DIN, ISO, EN, ho\u1eb7c c\u00e1c k\u00edch th\u01b0\u1edbc \u0111i\u1ec1u khi\u1ec3n b\u1ea3n v\u1ebd<\/td><\/tr><tr><td>K\u00edch th\u01b0\u1edbc<\/td><td>\u0110\u01b0\u1eddng k\u00ednh, chi\u1ec1u d\u00e0i, b\u01b0\u1edbc v\u00e0 chi\u1ec1u d\u00e0i ren<\/td><\/tr><tr><td>K\u1ebft th\u00fac<\/td><td>K\u1ebdm, \u0111en, HDG, v\u1ea3y k\u1ebdm, ho\u1eb7c tr\u01a1n<\/td><\/tr><tr><td>L\u1edbp h\u1ea1t<\/td><td>C\u00e1c \u0111ai \u1ed1c y\u1ebfu c\u00f3 th\u1ec3 b\u1ecb bong ra tr\u01b0\u1edbc khi bu-l\u00f4ng ho\u1ea1t \u0111\u1ed9ng<\/td><\/tr><tr><td>Lo\u1ea1i v\u00f2ng \u0111\u1ec7m<\/td><td>V\u00f2ng \u0111\u1ec7m m\u1ec1m c\u00f3 th\u1ec3 l\u00e0m gi\u1ea3m t\u1ea3i tr\u01b0\u1edbc<\/td><\/tr><tr><td>\u1ee8ng d\u1ee5ng<\/td><td>T\u1ea3i tr\u1ecdng, \u0111\u1ed9 rung, \u0103n m\u00f2n v\u00e0 nhi\u1ec7t \u0111\u1ed9<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p>\u0110\u1ed1i v\u1edbi nh\u1eefng m\u1eb7t h\u00e0ng th\u00f4ng th\u01b0\u1eddng, ng\u01b0\u1eddi mua c\u00f3 th\u1ec3 b\u1eaft \u0111\u1ea7u t\u1eeb <a href=\"https:\/\/xzfastener.com\/vi\/products-category\/standard-fasteners\/\">\u1ed1c v\u00edt ti\u00eau chu\u1ea9n<\/a>. \u0110\u1ed1i v\u1edbi c\u00e1c l\u1ef1a ch\u1ecdn l\u1edbp ph\u1ee7, h\u00e3y xem x\u00e9t <a href=\"https:\/\/xzfastener.com\/vi\/products-category\/various-coated-fasteners\/\">\u1ed1c v\u00edt tr\u00e1ng kh\u00e1c nhau<\/a>.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Nh\u1eefng sai l\u1ea7m ph\u1ed5 bi\u1ebfn c\u1ee7a ng\u01b0\u1eddi mua<\/h2>\n\n\n\n<p>Tr\u00e1nh nh\u1eefng v\u1ea5n \u0111\u1ec1 sau:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u0110\u1eb7t h\u00e0ng \u201c8.8 bu l\u00f4ng\u201d m\u00e0 kh\u00f4ng c\u00f3 th\u00f4ng tin chi ti\u1ebft v\u1ec1 ti\u00eau chu\u1ea9n ho\u1eb7c k\u00edch th\u01b0\u1edbc.<\/li>\n\n\n\n<li>K\u1ebft h\u1ee3p c\u00e1c bu l\u00f4ng v\u1edbi \u0111ai \u1ed1c c\u1ea5p th\u1ea5p. (8.8)<\/li>\n\n\n\n<li>Gi\u1ea3 s\u1eed m\u1ea1 k\u1ebdm c\u1ea3i thi\u1ec7n s\u1ee9c m\u1ea1nh.<\/li>\n\n\n\n<li>S\u1eed d\u1ee5ng 8.8 trong tr\u01b0\u1eddng h\u1ee3p \u0103n m\u00f2n nghi\u00eam tr\u1ecdng m\u00e0 kh\u00f4ng c\u1ea7n xem x\u00e9t l\u1ea1i l\u1edbp ph\u1ee7.<\/li>\n\n\n\n<li>Thay th\u1ebf 10.9 b\u1eb1ng 8.8 \u0111\u1ec3 gi\u1ea3m chi ph\u00ed m\u00e0 kh\u00f4ng c\u1ea7n ph\u00ea duy\u1ec7t k\u1ef9 thu\u1eadt.<\/li>\n\n\n\n<li>Tr\u1ed9n s\u1ed1 li\u1ec7u 8.8 v\u1edbi th\u00f4ng s\u1ed1 k\u1ef9 thu\u1eadt 8 inch.<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">RFQ Danh s\u00e1ch ki\u1ec3m tra cho 8.8 Bu l\u00f4ng<\/h2>\n\n\n\n<p>M\u1ed9t RFQ r\u00f5 r\u00e0ng n\u00ean bao g\u1ed3m:<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>Ti\u00eau chu\u1ea9n s\u1ea3n ph\u1ea9m<\/li>\n\n\n\n<li>\u0110\u01b0\u1eddng k\u00ednh, chi\u1ec1u d\u00e0i v\u00e0 b\u01b0\u1edbc ren<\/li>\n\n\n\n<li>Ren to\u00e0n b\u1ed9 ho\u1eb7c ch\u1ee7 \u0111\u1ec1 m\u1ed9t ph\u1ea7n<\/li>\n\n\n\n<li>Y\u00eau c\u1ea7u v\u1ec1 l\u1edbp (8.8)<\/li>\n\n\n\n<li>B\u1ec1 m\u1eb7t ho\u00e0n thi\u1ec7n<\/li>\n\n\n\n<li>C\u00e1c lo\u1ea1i h\u1ea1t v\u00e0 v\u00f2ng \u0111\u1ec7m ph\u00f9 h\u1ee3p<\/li>\n\n\n\n<li>S\u1ed1 l\u01b0\u1ee3ng v\u00e0 bao b\u00ec<\/li>\n\n\n\n<li>B\u00e1o c\u00e1o ki\u1ec3m tra c\u1ea7n thi\u1ebft<\/li>\n<\/ol>\n\n\n\n<p>\u0110\u1ed1i v\u1edbi c\u00e1c y\u00eau c\u1ea7u v\u1ec1 \u0111\u1ed9 d\u00e0i, ki\u1ec3u \u0111\u1ea7u ho\u1eb7c ren \u0111\u1eb7c bi\u1ec7t, h\u00e3y s\u1eed d\u1ee5ng <a href=\"https:\/\/xzfastener.com\/vi\/products-category\/custom-non-standard-fasteners\/\">\u1ed1c v\u00edt phi ti\u00eau chu\u1ea9n t\u00f9y ch\u1ec9nh<\/a>.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">L\u1eddi khuy\u00ean cu\u1ed1i c\u00f9ng<\/h2>\n\n\n\n<p>D\u1ea5u \u201c8.8\u201d c\u00f3 ngh\u0129a l\u00e0 bu l\u00f4ng c\u00f3 c\u1ea5p \u0111\u1ed9 b\u1ec1n theo h\u1ec7 m\u00e9t x\u00e1c \u0111\u1ecbnh. N\u00f3 r\u1ea5t h\u1eefu \u00edch nh\u01b0ng n\u00f3 kh\u00f4ng ph\u1ea3i l\u00e0 m\u1ed9t \u0111\u1eb7c t\u1ea3 ho\u00e0n ch\u1ec9nh.<\/p>\n\n\n\n<p>\u0110\u1ec3 mua h\u00e0ng an to\u00e0n, h\u00e3y x\u00e1c nh\u1eadn lo\u1ea1i, ti\u00eau chu\u1ea9n, k\u00edch th\u01b0\u1edbc, ren, l\u1edbp ho\u00e0n thi\u1ec7n, \u0111ai \u1ed1c, v\u00f2ng \u0111\u1ec7m v\u00e0 \u0111i\u1ec1u ki\u1ec7n l\u00e0m vi\u1ec7c tr\u01b0\u1edbc khi s\u1ea3n xu\u1ea5t.<\/p>\n\n\n\n<p><\/p>","protected":false},"excerpt":{"rendered":"<p>When buyers see \u201c8.8\u201d on a bolt head, it is easy to think it is just a factory mark. It is not. For metric bolts, 8.8 is a mechanical property class. It tells you the bolt\u2019s strength level under the relevant metric fastener standard. This marking is common on industrial bolts used in machinery, steel [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[479],"tags":[504],"class_list":["post-6753","post","type-post","status-publish","format-standard","hentry","category-fastener-knowledge-library","tag-strength-grades-mechanical-properties"],"acf":[],"_links":{"self":[{"href":"https:\/\/xzfastener.com\/vi\/wp-json\/wp\/v2\/posts\/6753","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=6753"}],"version-history":[{"count":1,"href":"https:\/\/xzfastener.com\/vi\/wp-json\/wp\/v2\/posts\/6753\/revisions"}],"predecessor-version":[{"id":6754,"href":"https:\/\/xzfastener.com\/vi\/wp-json\/wp\/v2\/posts\/6753\/revisions\/6754"}],"wp:attachment":[{"href":"https:\/\/xzfastener.com\/vi\/wp-json\/wp\/v2\/media?parent=6753"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/xzfastener.com\/vi\/wp-json\/wp\/v2\/categories?post=6753"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/xzfastener.com\/vi\/wp-json\/wp\/v2\/tags?post=6753"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}