Auto Racing Products Head Bolt Insert Washers 5/16in ID — Universal Racing Fasteners

SKU: BQDN_200-8571
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About Auto Racing Products ARP (Automotive Racing Products) makes the ...Read More

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Car Wheel Size Chart

Wheel Diameter (inches) Tire Width (mm) Aspect Ratio Rim Width (inches)
14185655.5
15195606.0
16205556.5
17215507.0
18225457.5
19235408.0
20245358.5

Note: Wheel and tire sizes vary by car make and model. Always consult your vehicle’s manufacturer for exact specifications.

How to Read Tire Size

Example: 225/45R17 means:

  • 225 = Tire width in mm
  • 45 = Aspect ratio (height as % of width)
  • R17 = Rim diameter in inches

Product Details

Product Description
Part Numbers
Sizing & Fit

About Auto Racing Products

ARP (Automotive Racing Products) makes the strongest fasteners in motorsport — head studs, main studs, rod bolts, and flexplate bolts used by every Formula 1, NHRA, NASCAR, and championship motorsport program. Aerospace-grade alloys, exact-fit machining.

Watch in action

High-Strength Head Bolt Insert Washers

Ensure precise clamping force with these Auto Racing Products head bolt insert washers. Designed for demanding racing applications, these washers provide the necessary load distribution for your cylinder head bolts, preventing damage to the head surface and ensuring a consistent torque reading during engine assembly.

Technical Specifications

  • Inner Diameter (ID): 0.313 inches (5/16")
  • Outer Diameter (OD): 0.625 inches
  • Insert OD: 0.380 inches
  • Material: High-strength Chromoly
  • Finish: Black Oxide for corrosion resistance
  • Quantity: Set of 10

These washers are manufactured from premium chromoly steel, offering superior structural integrity compared to standard hardware. The black oxide finish provides a durable barrier against the harsh environment of an engine bay. Whether you are building a high-compression naturally aspirated engine or a forced-induction powerhouse, using the correct hardware is critical to engine longevity. The insert design helps center the bolt and protect the cylinder head from galling during the tightening process. At GGCRACING, we prioritize high-quality fasteners to ensure your engine build meets professional standards every time you hit the track.

Product Details

Product Description
Part Numbers
Sizing & Fit

About Auto Racing Products

ARP (Automotive Racing Products) makes the strongest fasteners in motorsport — head studs, main studs, rod bolts, and flexplate bolts used by every Formula 1, NHRA, NASCAR, and championship motorsport program. Aerospace-grade alloys, exact-fit machining.

Watch in action

High-Strength Head Bolt Insert Washers

Ensure precise clamping force with these Auto Racing Products head bolt insert washers. Designed for demanding racing applications, these washers provide the necessary load distribution for your cylinder head bolts, preventing damage to the head surface and ensuring a consistent torque reading during engine assembly.

Technical Specifications

  • Inner Diameter (ID): 0.313 inches (5/16")
  • Outer Diameter (OD): 0.625 inches
  • Insert OD: 0.380 inches
  • Material: High-strength Chromoly
  • Finish: Black Oxide for corrosion resistance
  • Quantity: Set of 10

These washers are manufactured from premium chromoly steel, offering superior structural integrity compared to standard hardware. The black oxide finish provides a durable barrier against the harsh environment of an engine bay. Whether you are building a high-compression naturally aspirated engine or a forced-induction powerhouse, using the correct hardware is critical to engine longevity. The insert design helps center the bolt and protect the cylinder head from galling during the tightening process. At GGCRACING, we prioritize high-quality fasteners to ensure your engine build meets professional standards every time you hit the track.

Product Details

Product Description

About Auto Racing Products

ARP (Automotive Racing Products) makes the strongest fasteners in motorsport — head studs, main studs, rod bolts, and flexplate bolts used by every Formula 1, NHRA, NASCAR, and championship motorsport program. Aerospace-grade alloys, exact-fit machining.

Watch in action

High-Strength Head Bolt Insert Washers

Ensure precise clamping force with these Auto Racing Products head bolt insert washers. Designed for demanding racing applications, these washers provide the necessary load distribution for your cylinder head bolts, preventing damage to the head surface and ensuring a consistent torque reading during engine assembly.

Technical Specifications

  • Inner Diameter (ID): 0.313 inches (5/16")
  • Outer Diameter (OD): 0.625 inches
  • Insert OD: 0.380 inches
  • Material: High-strength Chromoly
  • Finish: Black Oxide for corrosion resistance
  • Quantity: Set of 10

These washers are manufactured from premium chromoly steel, offering superior structural integrity compared to standard hardware. The black oxide finish provides a durable barrier against the harsh environment of an engine bay. Whether you are building a high-compression naturally aspirated engine or a forced-induction powerhouse, using the correct hardware is critical to engine longevity. The insert design helps center the bolt and protect the cylinder head from galling during the tightening process. At GGCRACING, we prioritize high-quality fasteners to ensure your engine build meets professional standards every time you hit the track.

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