ARP 7/16" ID Flat Washers - ARP 200-8530 | A Series

ARP Flat Washers suitable for A Series Main Cap using ARP Main Cap Bolts.

🛡️Buy with confidence — every kit we sell is verified as genuine ARP, not cheaper alternatives pretending to be the real thing.

Tired of unreliable center main straps? ARP 7/16" ID Chamfer Washers (ARP 200-8530) offer a smarter, stronger solution for reinforcing the main caps on A-series 3-bearing crankshafts.

🔧 Why Center Main Straps Fail

In the 1960s, center main straps became popular when tuners pushed A-series engines to higher RPMs. But these straps aren't the perfect solution:

The 3-main bearing crank wasn’t built for sustained high RPMs
Main cap bolt heads often dig into the cap surface
This leads to reduced clamping force and eventual cap movement
Cap movement causes crank instability and potential catastrophic failure

🛡️ The ARP Solution: Precision Hardened Washers

ARP’s 7/16" ID chamfer washers are:

Made from hardened chrome moly steel
Finished in durable black oxide
Designed to distribute clamping force evenly
Built to prevent bolt head gouging into caps
A cost-effective and mechanically sound alternative to main straps

⚙️ARP Flat Washer - Technical Specification

Dimensions:

Inner Diameter (ID): 0.438" (11.11mm)
Outer Diameter (OD): 0.812" (20.62mm)
Thickness: 0.120" (3.05mm)
Chamfer: No

Properties:

Hardened: Yes
Material: Premium Chrome Moly
Finish: Black Oxide

Application:

Ideal for A Series & other applications

Package Quantity:

Sold in sets of: 10 washers

✅Additional Notes:

Perfect for race, high performance & street automotive applications
Known for exceptional durability and high load capacity
Affordable upgrade

What's included in the package?

ARP 7/16" ID Flat Washers - ARP 200-8530 | A Series - Pack of 10

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We are a family run business specialising in the development, machining, building & testing of competition engines with excellent customer service at competitive prices.

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