Specification of International standard of Fasteners

🌐 International Specifications & Standards for Nuts and Bolts

🔩 1. ISO (International Organization for Standardization)

Global standardizing body that sets universal norms for fasteners.

Common ISO Standards:

• ISO 4014 – Hex Head Bolts (partially threaded)

• ISO 4017 – Hex Head Screws (fully threaded)

• ISO 4032 – Hex Nuts

• ISO 4033 – Heavy Hex Nuts

• ISO 4762 – Socket Head Cap Screws

• ISO 898-1 – Mechanical properties of bolts, screws, and studs

• ISO 3506 – Stainless Steel fasteners

🔩 2. DIN (Deutsches Institut für Normung - Germany)

Widely used in Europe, especially in Germany and nearby regions.

Common DIN Standards:

• DIN 931 – Hex Head Bolts (Partially Threaded)

• DIN 933 – Hex Head Screws (Fully Threaded)

• DIN 934 – Hex Nuts

• DIN 985 – Nylon Insert Lock Nuts

• DIN 912 – Allen (Socket) Head Cap Screws

• DIN 125 / 9021 – Flat Washers

• DIN 7989 – Heavy-Duty Structural Washers

🔄 Note: Many DIN standards are now aligned or replaced with ISO standards (e.g., DIN 933 ≈ ISO 4017)

🔩 3. ASTM (American Society for Testing and Materials – USA)

Commonly used in North America and internationally for structural and industrial fasteners.

Common ASTM Standards:

• ASTM A307 – Carbon Steel Bolts and Studs

• ASTM A325 / A490 – Structural Bolts (High Strength)

• ASTM A563 – Carbon and Alloy Steel Nuts

• ASTM F436 – Hardened Washers

• ASTM F594 – Stainless Steel Nuts

• ASTM F593 – Stainless Steel Bolts

🔩 4. ANSI (American National Standards Institute – USA)

Cooperates with ASTM and SAE; defines thread forms and dimensions.

• ANSI B1.1 – Unified Inch Screw Threads

• ANSI B18.2.1 – Hex bolts and screws

• ANSI B18.2.2 – Square and hex nuts

🔩 5. SAE (Society of Automotive Engineers – USA)

Used primarily in automotive and aerospace industries.

• SAE J429 – Mechanical properties of bolts, screws, and studs

• SAE J995 – Mechanical properties of nuts

• SAE J1231 – Special fittings and fasteners

🔩 6. BS (British Standards)

Still used in some countries, though largely replaced by ISO/EN standards.

• BS 3692 – ISO Metric Precision Bolts and Screws

• BS 4190 – Hexagon bolts, screws and nuts

🔩 7. JIS (Japanese Industrial Standards)

Used widely in Japan and Asia.

• JIS B1180 – Hex Bolts

• JIS B1181 – Hex Screws

• JIS B1186 – Hex Nuts

• JIS B1188 – Washers