Bolts & Fasteners

bolts & fasteners: the hardware that clamps your build together

When you're torquing a cylinder head or rebuilding a bottom end, bolts & fasteners are the parts doing the real clamping work. Head studs and head bolt kits hold the head to the block against combustion pressure that wants to lift it; rod bolts keep the big end together at high rpm; and specialty pieces like bung caps seal off a bore you no longer use. Use upgraded fasteners when the stock hardware is stretched, when you've raised boost or compression, or any time you crack an engine open and don't want to reuse old bolts.

What ThreePiece stocks

There are 210 products in this category, priced from $7 to $1,629 - the current range for what's in stock, not a fixed quote. That spread runs from a single bung cap up to a full 12-point head stud kit. ARP dominates the range with 141 of those products, and you'll also find Vibrant, BLOX Racing, S&S Cycle, Manley Performance, Ford Racing, Carrillo and others, 31 brands in all across cars, trucks and motorcycles.

Concrete examples: the ARP Caterpillar C15 12-point head stud kit sits at the top end, the ARP Chrysler 5.7L/6.1L Hemi 625+ head stud kit covers late Hemi builds, the Ford Racing 18-21 5.0L Coyote head changing kit with 12mm head bolts serves Coyote swaps, the S&S Cycle 2017 M8 head bolt kit covers Harley M8 motors, and the Manley 3/8 ARP 625+ rod bolt set of 4 is a rod-bolt-only option. For a bulk sealing job there's the Vibrant M18x1.5 bung cap 100-pack.

How to choose

The first decision is studs versus bolts. Stud kits give consistent clamp load and let you torque the nut instead of twisting the fastener into the threads, which is why boosted and high-compression builds tend to run them. Bolt kits are simpler to install with the head in the chassis and cost less. The second decision is scope: a full head stud or head changing kit versus a rod-bolt-only set like the Manley pack - buy the smaller set only if you're replacing exactly those fasteners. Price tracks the count and the material, so a single-vehicle bolt kit lands far below a diesel 12-point stud kit.

What else you need with it

Fasteners are one line on a teardown list. If you're pulling a head, pair the hardware with head gaskets or a complete gasket kit. A bottom-end job usually also touches bearings and pistons, while plumbing and sensor work pulls in fittings. Browse everything under Engine Components.

Fitment and ordering

Fitment data is present on 24 of these products, spanning model years 1975 to 2024, with sample coverage naming vehicles like the Dodge Cummins, Ford Coyote, Harley-Davidson Big Twin and Porsche 911 - treat that as a sample, not the full list. Match the part number to your engine before ordering; if you're unsure, call fitment help at 813-535-5801 or reach out through contact us. Every order ships free, and Affirm and Katapult financing is available at checkout.

bolts & fasteners: the hardware that clamps your build together

When you're torquing a cylinder head or rebuilding a bottom end, bolts & fasteners are the parts doing the real clamping work. Head studs and head bolt kits hold the head to the block against combustion pressure that wants to lift it; rod bolts keep the big end together at high rpm; and specialty pieces like bung caps seal off a bore you no longer use. Use upgraded fasteners when the stock hardware is stretched, when you've raised boost or compression, or any time you crack an engine open and don't want to reuse old bolts.

What ThreePiece stocks

There are 210 products in this category, priced from $7 to $1,629 - the current range for what's in stock, not a fixed quote. That spread runs from a single bung cap up to a full 12-point head stud kit. ARP dominates the range with 141 of those products, and you'll also find Vibrant, BLOX Racing, S&S Cycle, Manley Performance, Ford Racing, Carrillo and others, 31 brands in all across cars, trucks and motorcycles.

Concrete examples: the ARP Caterpillar C15 12-point head stud kit sits at the top end, the ARP Chrysler 5.7L/6.1L Hemi 625+ head stud kit covers late Hemi builds, the Ford Racing 18-21 5.0L Coyote head changing kit with 12mm head bolts serves Coyote swaps, the S&S Cycle 2017 M8 head bolt kit covers Harley M8 motors, and the Manley 3/8 ARP 625+ rod bolt set of 4 is a rod-bolt-only option. For a bulk sealing job there's the Vibrant M18x1.5 bung cap 100-pack.

How to choose

The first decision is studs versus bolts. Stud kits give consistent clamp load and let you torque the nut instead of twisting the fastener into the threads, which is why boosted and high-compression builds tend to run them. Bolt kits are simpler to install with the head in the chassis and cost less. The second decision is scope: a full head stud or head changing kit versus a rod-bolt-only set like the Manley pack - buy the smaller set only if you're replacing exactly those fasteners. Price tracks the count and the material, so a single-vehicle bolt kit lands far below a diesel 12-point stud kit.

What else you need with it

Fasteners are one line on a teardown list. If you're pulling a head, pair the hardware with head gaskets or a complete gasket kit. A bottom-end job usually also touches bearings and pistons, while plumbing and sensor work pulls in fittings. Browse everything under Engine Components.

Fitment and ordering

Fitment data is present on 24 of these products, spanning model years 1975 to 2024, with sample coverage naming vehicles like the Dodge Cummins, Ford Coyote, Harley-Davidson Big Twin and Porsche 911 - treat that as a sample, not the full list. Match the part number to your engine before ordering; if you're unsure, call fitment help at 813-535-5801 or reach out through contact us. Every order ships free, and Affirm and Katapult financing is available at checkout.