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DIN 12-point bolts
DIN 12-Point bolts (German Industrial Standard 12-spline external-drive bolts, also called Vielzahn or double-hex) cover the German and broader European industrial market in metric thread profiles M5 through M30. They are widely used in European industrial assembly, German motorsport (Volkswagen, Porsche, BMW, Mercedes-AMG race programmes), Japanese motorsport and any drawing originated to ISO 261 / DIN 13-1 thread standards because the metric joint expects a metric fastener and a metric thread engagement. DIN 12-point bolts are typically produced in grade 12.9 alloy steel (1040 MPa proof, 1220 MPa tensile), with grade 10.9 (830 / 1040 MPa) and corrosion-resistant A286 / A4-80 stainless variants stocked for OEM-spec applications.
TorqBolt manufactures DIN 12-Point bolts in grade 12.9, grade 10.9, A286 (UNS S66286), Inconel 718, Ti-6Al-4V (Grade 5) 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 grade or alloy marking, and every lot ships with a mill test report (MTC 3.1 standard, MTC 3.2 critical with third-party witness inspection of chemistry, hardness, tensile, and PMI grade-verification records).
Common Alloys for DIN 12-Point
| Alloy | Tensile | Service envelope |
|---|---|---|
| A286 (UNS S66286) | 160 ksi | up to 700 °C |
| Inconel 718 (UNS N07718) | 180 ksi | up to 700 °C, jet-engine |
| AISI 8740 chromoly | up to 220 ksi (HT) | standard high-strength |
| Ti-6Al-4V (Grade 5) | 130 ksi | 56% lighter than steel |
Request a Quote
Send drawing or PO line referencing DIN 12-Point to info@torqbolt.com or call +91-22-66157017.
Related aerospace specs
For broader 12-point aerospace specification context, see also the parent aerospace fasteners hub and the full 12-point catalog, plus sibling specs:
- NAS1351, close-tolerance 12-point external-wrenching
- MS21250, 160 ksi 12-point external-drive aerospace bolt
- AS3216, 180 ksi superalloy 12-point for turbine section
- MIL-DTL-7838, legacy mil-spec, replaced by NAS series
- NAS6303, 3/16" body NAS 6300-series tension cap-screw
- NAS6304, 1/4" body NAS 6300-series tension cap-screw
- NAS6305, 5/16" body NAS 6300-series tension cap-screw
- NAS6308, 1/2" body NAS 6300-series tension cap-screw
- NAS6310, 5/8" body NAS 6300-series tension cap-screw
- NAS6312, 3/4" body NAS 6300-series tension cap-screw
- NAS6315, 15/16" body NAS 6300-series tension cap-screw
- NAS6320, 1-1/4" body NAS 6300-series tension cap-screw
Frequently Asked Questions
Which DIN standards cover 12-point external-drive bolts?
DIN 938 (stud bolts with reduced shank), DIN 939 (stud bolts metric), and AISI-equivalent ISO 4014 / ISO 4017 with external-drive overlays for 12-point applications. The DIN system covers metric thread engagement in coarse and fine series per DIN 13.
Are DIN 12-point bolts dimensionally interchangeable with US 12-point?
The 12-point head geometry is geometrically identical — twelve splines at 30-degree intervals. Thread system differs — DIN uses metric coarse and fine per DIN 13; US AS3216 / MS21250 use inch UNJF-3A per MIL-S-8879. Dimensional interchange requires matching both head and thread specifications.
Which alloy grades are typical for DIN-spec 12-point bolts?
Carbon steel property class 8.8 (800 MPa tensile), 10.9 (1000 MPa), and 12.9 (1200 MPa) per DIN ISO 898-1; austenitic stainless A2-70 and A4-80 per DIN ISO 3506-1; and special-grade alloy steels per DIN 267-9 covering high-temperature and corrosion-resistant applications.
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