Engine Kits

ARP Chevy SB, 3/8" Dia., .750" UHL, 12 Point Header Bolts
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ARP Bolts

ARP Chevy SB, 3/8" Dia., .750" UHL, 12 Point Header Bolts

Part #: 100-1203
List Price: $37.36
Our Price: $24.90
You Save: $12.46

Chevy Small Block, 3/8" diameter bolt, drilled, 3/8" wrench, 12 pack, 3/8" Size, .750" Under Head Length, 12-point head, Black Oxide, ARP Header Bolts 100-1203
ARP Header Bolts & Header Studs ARP manufactures a variety of premium grade bolt and stud kits to facilitate installation of exhaust headers including the popular stainless stud kit with 12-point nuts.

ARP Header Bolts & Header Studs that are Stainless 300 material are not affected by corrosion or extreme heat, making it ideal for the application. What’s more, the compact 12-point nut lets you easily slip a socket close to the pipe!

Each ARP accessory stud or bolt kit includes the specific number of parts for your application, plus premium-quality washers and hex or 12-point nuts, as required. Studs are manufactured with a unique nut-starter nose that helps prevent cross-threading.

ARP Header Bolts & Header Studs come either black oxide chrome moly or Stainless 300. Both are nominally rated at 170,000 psi tensile strength; substantially stronger than Grade 8 hardware. Specially drilled “NASCAR” models are available for those who wish to safety wire their header bolts to Special “NASCAR” model prevent loosening.

Studs are measured OAL (Over All Length) and Bolts are measured UHL (Under Head Length) 

Brand ARP
Fastener Finish Black oxide
Fastener Material Steel
Fastener Style Bolt
Head Style 12-point
Notes 170,000 psi tensile strength, 3/8 in. wrench. Drilled for safety wire.
Part Type Header Fasteners
Product Line ARP Chromemoly Header Bolt Kits
Quantity Sold as a set of 12.
Thread Size 3/8-16 in.
Underhead Length (in) 0.750 in.
Underhead Length (mm) 19mm

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