Product Knowledge Views: 23

Standards and differences: Common standards: 1) GB/T (China) - e.g. GB/T 6138 (counterbores), GB/T 4264 (countersinks) - dimensions, angles, tolerances, technical requirements; 2) DIN (Germany) - e.g. DIN 335 (counterbores), DIN 373 (countersinks) - high precision and quality, widely used in Europe and globally; 3) ANSI/ASME (USA) - e.g. ANSI B94.9 (counterbores) - common in the Americas; 4) JIS (Japan) - e.g. JIS B 4303 - used in Japan and Southeast Asia; 5) company standards - often stricter than national standards or covering products national standards do not. Differences: 1) Angles - GB and DIN commonly 90/120 degrees; ANSI commonly 82 degrees (US flat-head screws); JIS commonly 90; 2) Dimensions - size series and tolerances differ; 3) Precision - DIN is the most demanding, then ANSI, then GB; 4) Material - DIN requires cobalt HSS or carbide; GB allows standard HSS; 5) Application - regional habits differ; export to target-market standards. How to choose: 1) domestic customers - GB or company standard, usually 90/120 degrees; 2) export to Europe - DIN, usually 90; 3) export to the Americas - ANSI, usually 82; 4) export to Japan - JIS, usually 90; 5) customer drawings - follow their spec or standard. We produce to GB, DIN, ANSI, JIS or customer drawings, meeting different markets. Export products can include material certificates, test reports, certificates of origin and other customs documents.