ARP was established back in 1968 by Gary Holzapfel who was passionate about creating reliable fasteners for the automotive industry.

ARP manufactures a variety of premium grade bolt and stud kits to facilitate installation of exhaust headers including the popular stainless steel kit with 12-point nuts.

ARP manufactures a variety of premium grade bolt and stud kits to facilitate installation of exhaust headers including the popular stainless steel kit with 12-point nuts.

Rocker Arm Studs, High Performance, 3/8-24 in. Thread, 1.75 in. Effective Stud Length, Chevy, Small Block,Pair

High Performance head bolts are available with a reduced wrenching hex or 12-point and wide area flanged head that eliminates the need for valve train removal to facilitate cylinder head retorquing. All High Performance Series bolts are 180,000 PSI (which is 15% stronger than Grade 8) and kits come complete with hardened parallel-ground washers.

High Performance head bolts are available with a reduced wrenching hex or 12-point and wide area flanged head that eliminates the need for valve train removal to facilitate cylinder head retorquing. All High Performance Series bolts are 180,000 PSI (which is 15% stronger than Grade 8) and kits come complete with hardened parallel-ground washers.

High Performance head bolts are available with a reduced wrenching hex or 12-point and wide area flanged head that eliminates the need for valve train removal to facilitate cylinder head retorquing. All High Performance Series bolts are 180,000 PSI (which is 15% stronger than Grade 8) and kits come complete with hardened parallel-ground washers.

Rocker Arm Studs, High Performance, 7/16-20 in. Thread, 1.77 in. Effective Stud Length, Chevy,Small Block,Pair

High Performance head bolts are available with a reduced wrenching hex or 12-point and wide area flanged head that eliminates the need for valve train removal to facilitate cylinder head retorquing. All High Performance Series bolts are 180,000 PSI (which is 15% stronger than Grade 8) and kits come complete with hardened parallel-ground washers.

High Performance head bolts are available with a reduced wrenching hex or 12-point and wide area flanged head that eliminates the need for valve train removal to facilitate cylinder head retorquing. All High Performance Series bolts are 180,000 PSI (which is 15% stronger than Grade 8) and kits come complete with hardened parallel-ground washers.

Rocker Arm Studs, High Performance, 3/8-24 in. Thread, 1.895 in. Effective Stud Length, Chevy,Small Block,Pair

Rocker Arm Studs, High Performance, 3/8-24 in. Thread, 1.75 in. Effective Stud Length, Chevy, Vortec, Kit

The brand's product list ranges
from high performance OEM replacement parts to specialty hardware for racing and
marine applications.

High Performance head bolts are available with a reduced wrenching hex or 12-point and wide area flanged head that eliminates the need for valve train removal to facilitate cylinder head retorquing. All High Performance Series bolts are 180,000 PSI (which is 15% stronger than Grade 8) and kits come complete with hardened parallel-ground washers.

Main Studs, 2-Bolt Main, Ford, 1.6L, Kit

High Performance head bolts are available with a reduced wrenching hex or 12-point and wide area flanged head that eliminates the need for valve train removal to facilitate cylinder head retorquing. All High Performance Series bolts are 180,000 PSI (which is 15% stronger than Grade 8) and kits come complete with hardened parallel-ground washers.

High Performance head bolts are available with a reduced wrenching hex or 12-point and wide area flanged head that eliminates the need for valve train removal to facilitate cylinder head retorquing. All High Performance Series bolts are 180,000 PSI (which is 15% stronger than Grade 8) and kits come complete with hardened parallel-ground washers.

Rocker Arm Studs, 8740 Chromoly, 8mm x 1.25 Base Thread, 3/8 in.-24 Top Thread, 1.75 in. Length, Chevy, Pair

High Performance head bolts are available with a reduced wrenching hex or 12-point and wide area flanged head that eliminates the need for valve train removal to facilitate cylinder head retorquing. All High Performance Series bolts are 180,000 PSI (which is 15% stronger than Grade 8) and kits come complete with hardened parallel-ground washers.

High Performance head bolts are available with a reduced wrenching hex or 12-point and wide area flanged head that eliminates the need for valve train removal to facilitate cylinder head retorquing. All High Performance Series bolts are 180,000 PSI (which is 15% stronger than Grade 8) and kits come complete with hardened parallel-ground washers.

Rocker Arm Studs, Pro Series, 7/16-20 in. Thread, 1.90 in. Effective Stud Length, Kit

It is for good reason that virtually every top professional engine builder relies on ARP Pro Series head studs for their all-out competition powerplants. Simply stated, there's not a better stud setup on the market today.

It is for good reason that virtually every top professional engine builder relies on ARP Pro Series head studs for their all-out competition powerplants. Simply stated, there’s not a better stud setup on the market today.
For openers, ARP uses a premium grade 8740 alloy that is rated far superior to “aircraft” quality. Each stud is placed vertically in special racks and precisely heat-treated to 200,000 psi. This procedure ensures complete heat penetration and the results are far superior to those lesser quality studs from other manufacturers who just dump pieces in a basket and hope for the best.

These Pro series studs from ARP are cold-forged to ensure molecular integrity. They are heat-treated prior to thread rolling and machining and are rated at a whopping 190,000 psi. The Pro series kits are also available with 12-point nuts, and all kits come complete with hardened parallel washers for an even load distribution and accurate torque readings

Cylinder Head Bolts, Pro Series, 12-Point Head, Chevy, Small Block, Kit

It is for good reason that virtually every top professional engine builder relies on ARP Pro Series head studs for their all-out competition powerplants. Simply stated, there’s not a better stud setup on the market today.
For openers, ARP uses a premium grade 8740 alloy that is rated far superior to “aircraft” quality. Each stud is placed vertically in special racks and precisely heat-treated to 200,000 psi. This procedure ensures complete heat penetration and the results are far superior to those lesser quality studs from other manufacturers who just dump pieces in a basket and hope for the best.

Cylinder Head Bolts, Pro Series, 12-Point Head, Chevy, Small Block, Kit

It is for good reason that virtually every top professional engine builder relies on ARP Pro Series head studs for their all-out competition powerplants. Simply stated, there's not a better stud setup on the market today.

Cylinder Head Bolts, Pro Series 12-Point, Chevy, Small Block, Kit

ARP high performance cylinder head stud kits are precision centerless-ground and thread-rolled to Mil-S-8879 specs. Their black oxide finish protects them from wear and corrosion, and ARP throws in hardened parallel washers for uniform load distribution and accurate torque readings. Keep your cylinders mounted solidly with a set of these ARP high performance cylinder head stud kits.

ARP high performance cylinder head stud kits are precision centerless-ground and thread-rolled to Mil-S-8879 specs. Their black oxide finish protects them from wear and corrosion, and ARP throws in hardened parallel washers for uniform load distribution and accurate torque readings. Keep your cylinders mounted solidly with a set of these ARP high performance cylinder head stud kits.

All Pro Series bolts are cold-forged to ensure molecular integrity, heat-treated prior to thread rolling and machining, and meet the ARP "ZERO defect - ZERO failure" quality standard. ARP Pro Series head bolt kits are application specific and designed to deliver superior strength typically associated with competition engines.

Cylinder Head Bolts, Pro Series 12-Point, Chevy, Small Block, GM 18 Degree Heads, Kit

All Pro Series bolts are cold-forged to ensure molecular integrity, heat-treated prior to thread rolling and machining, and meet the ARP "ZERO defect - ZERO failure" quality standard. ARP Pro Series head bolt kits are application specific and designed to deliver superior strength typically associated with competition engines.

Cylinder Head Bolts, Pro Series 12-Point, Chevy, Small Block, GM 18 Degree High Port Heads, Kit

Cylinder Head Bolts, Pro Series 12-Point, Chevy, Small Block, GM 18 Degree High Port Heads, Kit

ARP has literally hundreds of standards and specifications that everyone at ARP is completely dedicated to the development and analysis of appropriate bolt designs for all types of applications.

ARP has literally hundreds of standards and specifications that everyone at ARP is completely dedicated to the development and analysis of appropriate bolt designs for all types of applications. None of the ARP bolt designs are as critical as those required for real-world Motorsports applications.

Cylinder Head Studs, Pro Series Hex, Chevy, 302, 327, 350, 400, Kit

Cylinder Head Studs, Pro Series Hex, Chevy, 5.7L, Dart 18 Degree Heads, Kit

Cylinder Head Studs, Pro Series, Hex Head, Chevy, 302, 327, 350, 400, Brodix, -12, 18 Degree, Kit