Rod Bolts

Rod Bolts: the fastener that holds your rotating assembly together

Rod bolts are the two fasteners that clamp each connecting rod cap to the rod, keeping the big end wrapped tight around the crank journal. Every combustion cycle tries to stretch them, and at high rpm the inertia of the piston and rod pulls hard at the top of the exhaust stroke. If a rod bolt yields or fatigues, the cap lets go and the rod exits the block. That is why anyone building a boosted or high-rpm engine replaces the factory bolts before adding power. Fresh rod bolts also give you a known, repeatable stretch spec on rebuild, which is how you set proper bearing crush.

What ThreePiece stocks

There are 21 rod bolt products in this category right now, spanning two brands: ARP (20 of the listings) and Eagle (1). Current prices run from $27 to $353 for what is in stock, which is a live range rather than a fixed quote. At the top sits the ARP Custom Age 625+ Carrillo Replacement 300-6703 at $352.63, with the ARP Custom Age 625+ Carrillo Replacement 300-6708 close behind at $300.38. The Eagle Replacement Rod Bolt Set is an 8-piece ARP2000 set with 3/8in thread and 7/16in socket at $127.71.

Product names in this category reference Nissan, Ford, Subaru, BMW, Toyota and Audi engines. Two of the listings carry specific fitment data, covering the Toyota Supra and Audi 2.7L / 2.8L across a 1993 to 2005 year range. Treat that as a partial picture, not the full compatibility list.

How to choose

Rod bolts are chosen to match a specific rod, so the deciding factor is which rod set or engine you are building around, not brand loyalty.

  • Replacement sets like the Eagle bolts are the move when you are refreshing a known rod and want the correct thread and length back in the same holes.
  • ARP Custom Age 625+ Carrillo replacements are premium single-application fasteners for rods that spec them. If your rod calls for a Carrillo-pattern bolt, buy that exact part rather than a generic set.
  • Price tracks the application, not the count. A full 8-piece set can cost less than a pair of high-end replacement bolts, so read the quantity and the rod requirement before you compare numbers.

When in doubt, match the part to the rod manufacturer's listed bolt and follow their stretch spec.

What else you need with it

Rod bolts are one line on a rebuild sheet. New rod bearings go in at the same time, so check Bearings. If you are changing rods or forced-induction hardware you will likely be looking at Pistons, and any block that comes apart wants fresh sealing from Head Gaskets and Gasket Kits. Plumbing and cooling for the finished build live under Fittings and Radiators. Browse everything in the Engine Components section to fill out the parts list.

Fitment help and ordering

Because only some listings carry vehicle data, confirm the bolt against your rod before ordering. Call our fitment line at 813-535-5801 or reach us through contact us if you are unsure which part your rods require. Every order ships with free shipping, and Affirm and Katapult financing is available if you would rather spread the cost — see financing for details.

Rod Bolts: the fastener that holds your rotating assembly together

Rod bolts are the two fasteners that clamp each connecting rod cap to the rod, keeping the big end wrapped tight around the crank journal. Every combustion cycle tries to stretch them, and at high rpm the inertia of the piston and rod pulls hard at the top of the exhaust stroke. If a rod bolt yields or fatigues, the cap lets go and the rod exits the block. That is why anyone building a boosted or high-rpm engine replaces the factory bolts before adding power. Fresh rod bolts also give you a known, repeatable stretch spec on rebuild, which is how you set proper bearing crush.

What ThreePiece stocks

There are 21 rod bolt products in this category right now, spanning two brands: ARP (20 of the listings) and Eagle (1). Current prices run from $27 to $353 for what is in stock, which is a live range rather than a fixed quote. At the top sits the ARP Custom Age 625+ Carrillo Replacement 300-6703 at $352.63, with the ARP Custom Age 625+ Carrillo Replacement 300-6708 close behind at $300.38. The Eagle Replacement Rod Bolt Set is an 8-piece ARP2000 set with 3/8in thread and 7/16in socket at $127.71.

Product names in this category reference Nissan, Ford, Subaru, BMW, Toyota and Audi engines. Two of the listings carry specific fitment data, covering the Toyota Supra and Audi 2.7L / 2.8L across a 1993 to 2005 year range. Treat that as a partial picture, not the full compatibility list.

How to choose

Rod bolts are chosen to match a specific rod, so the deciding factor is which rod set or engine you are building around, not brand loyalty.

  • Replacement sets like the Eagle bolts are the move when you are refreshing a known rod and want the correct thread and length back in the same holes.
  • ARP Custom Age 625+ Carrillo replacements are premium single-application fasteners for rods that spec them. If your rod calls for a Carrillo-pattern bolt, buy that exact part rather than a generic set.
  • Price tracks the application, not the count. A full 8-piece set can cost less than a pair of high-end replacement bolts, so read the quantity and the rod requirement before you compare numbers.

When in doubt, match the part to the rod manufacturer's listed bolt and follow their stretch spec.

What else you need with it

Rod bolts are one line on a rebuild sheet. New rod bearings go in at the same time, so check Bearings. If you are changing rods or forced-induction hardware you will likely be looking at Pistons, and any block that comes apart wants fresh sealing from Head Gaskets and Gasket Kits. Plumbing and cooling for the finished build live under Fittings and Radiators. Browse everything in the Engine Components section to fill out the parts list.

Fitment help and ordering

Because only some listings carry vehicle data, confirm the bolt against your rod before ordering. Call our fitment line at 813-535-5801 or reach us through contact us if you are unsure which part your rods require. Every order ships with free shipping, and Affirm and Katapult financing is available if you would rather spread the cost — see financing for details.