Specifications
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
Cam Bolts and Camshaft Hold-Down Bolts
TorqBolt manufactures cam bolts and camshaft hold-down bolts in 8740 chromoly heat-treated and other compatible alloys to AS9100D and ISO 9001:2015 quality systems. Each fastener head carries the struck tB manufacturer ligature plus the 8740 chromoly heat-treated (or specified) alloy grade marking for traceability. Camshaft hold-down bolts (cam cap bolts) clamp the cam caps to the cylinder head, supporting the camshaft journal in OHV and OHC valvetrain configurations. 12-point geometry common.
Materials
Alloy choice is set by the spec, the service temperature, the corrosion environment, and the strength target. TorqBolt routinely produces cam bolts and camshaft hold-down 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.
Frequently asked questions
What is a 12-point bolt?
A 12-point bolt has 12 splines arranged every 30 degrees on the OUTSIDE of the bolt head, also called a bi-hex or double-hex bolt. The 12 external splines provide twice the wrench-engagement angles of a standard hex head, allowing higher applied torque before cam-off, which is why aerospace and motorsport applications adopt the geometry.
Are 12-point bolts the same as ISO 14579?
No. ISO 14579 specifies an INTERNAL hexalobular socket head (similar to Torx) recessed inside a cap screw. External 12-point bolts under MS21250 / NAS1351 / AS3216 use an EXTERNAL bi-hex head driven by a 12-point socket wrench. Both involve 12 features but on different sides of the bolt head and require different drivers.
Which alloys does TorqBolt manufacture 12-point bolts in?
TorqBolt produces 12-point bolts in A286 (UNS S66286), Inconel 718 (UNS N07718), Ti-6Al-4V Grade 5, MP35N (UNS R30035), Custom 465 H1025, AISI 8740 chromoly heat-treated, AISI 4340, 17-4 PH, H-11 tool steel, and L19 race-grade alloy steel. Choice depends on tensile target, service temperature, and corrosion environment.
Is TorqBolt AS9100D certified?
Yes. TorqBolt operates under AS9100D Rev D and ISO 9001:2015 quality management systems, audited annually by the registrar. NORSOK M-630 and NACE MR0175 / ISO 15156 qualifications cover offshore and sour-service applications. Mill test reports MTC 3.1 standard and MTC 3.2 critical-service witness are issued with every lot.
What lead time should I expect?
Stock alloys (A286, AISI 8740, AISI 4340, 17-4 PH, 316 stainless) ship in 4 to 6 weeks. Specialty alloys (Inconel 718, MP35N, Custom 465, Ti-6Al-4V, L19) ship in 8 to 12 weeks depending on raw-bar lead time at the alloy producer. Critical-service orders requiring third-party witness inspection (MTC 3.2) add 1 to 2 weeks for witness scheduling.
Camshaft hold-down context
Cam bolts retain the camshaft to the cylinder head (in pushrod V8 engines, on the cam tower of OHC engines, or as cam-cap bolts in DOHC engines). The bolt sees relatively modest tensile load compared to head studs or rod bolts, but the under-head torque budget is constrained by the aluminum cylinder head it threads into; over-torque strips the threaded hole. 12-point head bolts at appropriate length and 8740 chromoly heat-treated to 160 ksi are typical.
In OHC engines (Toyota 2JZ, Ford Coyote, Subaru EJ25), the cam tower is retained to the head with the same family of bolts. See the engine-specific pages: 2JZ head studs, Coyote head studs, LS head studs, Hemi head studs, Barra head studs. Dimensional reference: 12-point bolt head dimensions.
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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