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
Cam Bolts and Camshaft Hold-Down Bolts
Cam bolts (camshaft hold-down bolts, cam cap bolts) clamp the cam caps to the cylinder head and support the camshaft journals in OHC and OHV valvetrains. They are widely used in race-engine builds, forced-induction rebuilds, and aftermarket high-RPM cam upgrades because the stock OE cam bolts often lack the fatigue rating needed when valve-spring pressures climb above 350 lb/in or when cam profiles get aggressive. The 12-point head is very popular on cam bolts because the cam-cap pocket is shallow, the cam-cover and oil-galley clearance is tight, and the twelve splines allow the higher applied torque needed for repeatable preload without a deep socket.
TorqBolt manufactures cam bolts in AISI 8740 chromoly heat-treated (220 ksi), AISI 4340, 17-4 PH H1025, A286 (for forced-induction aluminium-head builds where galvanic mismatch matters) and L19 race-grade alloy steel to AS9100D Rev D and ISO 9001:2015 quality systems. Each bolt head carries the struck tB manufacturer ligature plus the alloy grade marking, and every lot ships with a mill test report (MTC 3.1 standard, MTC 3.2 critical with hardness, tensile, magnetic-particle, and dimensional inspection records).
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.
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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