Standards
Surface Treatments
Certifications
- ISO 9001 - 2015 Certified
- PED 2014/68/EC
- NACE MR0175/ISO 15156-2
- NORSOK M-650
- DFAR
- MERKBLATT AD 2000 W2/W7/W10
Metric 12-Point Bolts (M5 to M30)
Metric 12-point bolts are external-drive 12-spline bolts produced to ISO and DIN metric thread profiles (M5 through M30) instead of the imperial UNJF profiles used on US aerospace 12-point bolts. They are widely used in European industrial assemblies, German motorsport (Volkswagen, Porsche, BMW, Mercedes-AMG race programmes), Japanese motorsport, and any drawing originated to ISO 261 / DIN 13-1 standards because the metric-thread joint expects a metric fastener and a metric thread engagement. The 12-point head is also very popular on metric grade-12.9 high-tensile bolts because its higher applied torque without cam-off is needed to develop the 1040 MPa proof load that grade 12.9 demands.
TorqBolt manufactures metric 12-point bolts in grade 12.9 alloy steel (1040 MPa proof, 1220 MPa tensile), grade 10.9 (830 / 1040 MPa), A286 (UNS S66286 for aerospace metric), Inconel 718 (for German turbine bolting under DIN 65537), Ti-6Al-4V and 17-4 PH H1025 to AS9100D Rev D and ISO 9001:2015 quality systems. Each bolt head carries the struck tB manufacturer ligature plus the alloy or grade marking, and every lot ships with a mill test report (MTC 3.1 standard, MTC 3.2 critical with chemistry, hardness, tensile and PMI grade-verification records).
Materials
Alloy choice is set by the spec, the service temperature, the corrosion environment, and the strength target. TorqBolt routinely produces metric 12-point bolts in A286 (UNS S66286), Inconel 718, Ti-6Al-4V (Grade 5), MP35N (UNS R30035), Custom 465 stainless, AISI 8740 chromoly heat-treated, AISI 4340, 17-4 PH H1025 condition, H-11 tool steel, and L19 race-grade alloy steel.
Metric property classes
Metric 12-point bolts are specified by ISO 898-1 property class for alloy-steel variants: 10.9 (1040 MPa tensile, 940 MPa yield) and 12.9 (1220 MPa tensile, 1100 MPa yield). Class 10.9 is the standard for general high-strength industrial fastening; class 12.9 is for race-engine and aerospace structural service where the 17 percent tensile bump matters. Stainless metric variants follow ISO 3506: A2-70 (austenitic stainless 700 MPa tensile) and A4-80 (molybdenum-stabilized austenitic 800 MPa) for corrosion-resistant joints.
European-standard 12-point bolts in metric thread are documented under DIN 12-point bolts. The internal-hexalobular (Torx-style) cap screw equivalent is ISO 14579, a different drive system entirely. For aerospace metric threads in A286 or Inconel 718, the European AECMA EN 6066 family applies. UNJ-3A external thread dimensions table covers the inch-thread side of the catalog.
Request a Quote
RFQ to info@torqbolt.com, call +91-22-66157017, or WhatsApp +91-22-66157017. Mill test report (MTC 3.1 standard, 3.2 critical-service) ships with every lot.
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