{"id":8760,"date":"2025-02-06T20:40:35","date_gmt":"2025-02-06T12:40:35","guid":{"rendered":"https:\/\/xzfastener.com\/?p=8760"},"modified":"2026-06-29T20:41:52","modified_gmt":"2026-06-29T12:41:52","slug":"how-to-prevent-specification-errors-in-china-fastener-orders","status":"publish","type":"post","link":"https:\/\/xzfastener.com\/ar\/how-to-prevent-specification-errors-in-china-fastener-orders\/","title":{"rendered":"How to Prevent Specification Errors in China Fastener Orders"},"content":{"rendered":"

Specification errors are one of the most expensive problems in China fastener sourcing. The part may be produced correctly according to the supplier\u2019s understanding, but still be wrong for the buyer\u2019s assembly. That is why the RFQ must remove assumptions before price, production, and packing begin.<\/p>\n\n\n\n

For importers and distributors, the goal is simple: define the fastener so clearly that there is no room for interpretation.<\/p>\n\n\n\n

Start With the Exact Standard<\/h2>\n\n\n\n

Never quote only by product name. \u201cHex bolt,\u201d \u201csocket screw,\u201d or \u201cwasher\u201d is not enough.<\/p>\n\n\n\n

State the standard, size, grade, finish, and quantity in one line. If the part follows DIN, ISO, ASTM, ASME, SAE, JIS, or a customer drawing, write it clearly. For metric standards, this \u062f\u0644\u064a\u0644 \u0645\u0639\u0627\u064a\u064a\u0631 \u0627\u0644\u062a\u062b\u0628\u064a\u062a DIN \u0648ISO<\/a> is useful when checking common standard references.<\/p>\n\n\n\n

Specification Point<\/th>\u062e\u0637\u0623 \u0634\u0627\u0626\u0639<\/th>Correct RFQ Practice<\/th><\/tr><\/thead>
\u0642\u064a\u0627\u0633\u064a<\/td>DIN and ISO treated as identical<\/td>State exact standard and revision if needed<\/td><\/tr>
\u0627\u0644\u062d\u062c\u0645<\/td>Length or pitch missing<\/td>Include diameter, length, pitch, and thread length<\/td><\/tr>
\u0627\u0644\u0635\u0641<\/td>Material confused with strength<\/td>State property class or grade separately<\/td><\/tr>
\u0625\u0646\u0647\u0627\u0621<\/td>\u201cGalvanized\u201d used too loosely<\/td>Specify zinc plated, hot-dip galvanized, black oxide, etc.<\/td><\/tr>
\u0627\u0644\u0645\u0648\u0636\u0648\u0639<\/td>UNC, UNF, and metric mixed<\/td>Confirm thread series and pitch<\/td><\/tr>
Drawing<\/td>Old revision used<\/td>Mark latest drawing revision<\/td><\/tr>
\u0627\u0644\u062a\u0639\u0628\u0626\u0629<\/td>Quantity unclear<\/td>Define pieces per box, carton, and pallet<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

Confirm Material and Strength Separately<\/h2>\n\n\n\n

Material and strength are not the same thing. Carbon steel can be Grade 4.8, 8.8, 10.9, or other classes. Stainless steel may be 304, 316, A2-70, or A4-80.<\/p>\n\n\n\n

For general sourcing, review available \u0645\u0646\u062a\u062c\u0627\u062a \u0627\u0644\u0633\u062d\u0627\u0628\u0629<\/a> and then define the exact material and grade in the RFQ. Do not rely on a supplier to infer strength from the product name.<\/p>\n\n\n\n

Control Surface Finish Details<\/h2>\n\n\n\n

Finish errors are common because different markets use different wording. \u201cZinc,\u201d \u201cgalvanized,\u201d and \u201cplated\u201d are often used casually, but they do not mean the same thing.<\/p>\n\n\n\n

State Finish Requirements Clearly<\/h3>\n\n\n\n

For coated orders, confirm:<\/p>\n\n\n\n