REPLACEMENT ROD BOLT - STEEL CONRODS
ARP replacement 5/16" rod bolt sets for use with the full range of MED steel conrods. Replacement is usually recommended when rebuilding a high-power competition engine.
These should be torqued to 30lb.ft, or preferably checked using an ARP rod bolt stretch gauge and stretched to 0.0050"-0.0055". You will need a 12-point 9mm socket/spanner.
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What torque settings should I use?
5/16" fixings should be torqued to 30lb.ft, or preferably checked using an ARP rod bolt stretch gauge and stretched to 0.0050"-0.0055".
These bolts are machined from ARP2000, an alloy steel with a tensile strength of 220,000 PSI. ARP2000 is used widely in motorsport applications as an upgrade from 8740 chrome moly in both steel and aluminium rods. Stress corrosion and hydrogen embrittlement are typically not a problem, providing care is taken during installation.
As long as the fasteners have been installed and torqued correctly, and show no visible signs of damage, they can be re-used. That's the general advice, however we would always recommend to replace these bolts during a valuable competition engine rebuild.