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ARP 200-8554 Chrome Moly Hardened Washers 3/8" I.D. - 10 Pack

Manufacturer

ARP

<h3>The Gold Standard in Performance Fasteners</h3> <p>When racing enthusiast Gary Holzapfel recognized that fastener failure was causing many engine breakdowns in 1968, he founded Automotive Racing Products (ARP) to solve a critical problem in motorsports. Drawing on his aerospace fastener manufacturing experience, Holzapfel created a company that would revolutionize the performance fastener industry. Today, ARP stands as the world's premier manufacturer of high-strength bolts, studs, nuts, and specialized hardware for racing and high-performance applications.</p> <p>ARP controls all aspects of the manufacturing process in-house, with all operations closely monitored, enabling the company to maintain its reputation for zero-defect quality. Every fastener undergoes forging, heat treatment, thread rolling, and precision finishing at ARP's Southern California facilities, which span over 115,000 square feet. This vertically integrated approach ensures that each component meets exacting standards for strength, fatigue resistance, and reliability under extreme conditions.</p> <h3>Engineered for Championship Performance</h3> <p>ARP's customer roster reads like a who's who of professional motorsports. The product line ranges from quality high-performance OEM replacement parts to exotic specialty hardware for Formula 1, IndyCar, NASCAR and NHRA drag racing and marine applications. The company's fasteners have secured victories in virtually every major racing championship worldwide, from Top Fuel dragsters to Formula One cars, proving their worth under the most demanding conditions imaginable.</p> <p>The brand's <a href="/48-arp-engine-cylinder-head-bolt-set-10306">engine cylinder head bolt sets</a> represent the cornerstone of ARP's catalog, offering engine builders the clamping force and reliability needed to prevent head gasket failure in high-boost and high-compression applications. These precision-engineered fasteners utilize proprietary materials and heat treatments that deliver up to ten times the fatigue strength of conventional bolts, making them essential for any serious performance build.</p> <p>For engine internals, ARP manufactures <a href="/48-arp-engine-connecting-rod-5276">connecting rods</a> designed to withstand extreme cylinder pressures and high RPM loads. Each rod is manufactured to aerospace standards with tight tolerances and superior material properties. Whether you're building a street performance engine or a full competition powerplant, ARP connecting rods provide the strength and consistency that professional engine builders demand.</p> <h3>Complete Fastener Solutions</h3> <p>Beyond engine components, ARP's product range extends throughout the entire vehicle. The company's <a href="/48-arp-wheel-lug-stud-7680">wheel lug studs</a> offer critical safety and performance benefits for racing and high-performance street applications, providing greater clamping force and durability than factory studs. ARP's product line contains thousands of part numbers and has expanded to include virtually every fastener found in an engine and driveline.</p> <p>Individual <a href="/48-arp-engine-cylinder-head-bolt-5308">engine cylinder head bolts</a> are also available for custom applications or specific replacement needs, manufactured to the same exacting standards as complete sets. This flexibility allows builders to source exactly what they need for specialized builds or repairs without compromising on quality.</p> <p>What sets ARP apart is not just the breadth of their catalog, but their willingness to develop custom solutions for unique applications. The company maintains complete R&D capabilities, including metallurgical research, product design, prototype machining, and extensive laboratory testing. This engineering expertise ensures that whether you're installing a simple head stud kit or building a record-setting race engine, ARP fasteners deliver the reliability and performance that professionals trust.</p>

Part Number

200-8554
07/13/2036 8:25 AM
Sale Price

$8.64

In Stock (10+)

delivery box

Usually delivered within 2 days

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No Hassle Returns

No Hassle Returns

Live-in-stock inventory

Live-in-stock inventory

Fitment guaranteed

Fitment guaranteed

Product Details

ARP 200-8554 high-performance chrome moly washers are engineered for demanding fastener applications where precision and strength are critical. These premium washers feature a 3/8" inside diameter with no chamfer design, making them ideal for use with ARP cylinder head studs, main studs, and other critical fasteners.

Key Features:

  • Constructed from premium chrome moly steel for exceptional strength and durability
  • Parallel-ground surfaces ensure even load distribution and precise torque transfer
  • Heat-treated and hardened to prevent deformation under high clamp loads
  • Black oxide finish provides corrosion resistance and professional appearance
  • No chamfer design for specific fastener applications
  • Precision machined to tight tolerances for consistent performance

This package includes 10 washers, allowing you to keep critical spares on hand for engine builds and repairs. ARP washers are the professional's choice when precise fastener preload and reliability are non-negotiable.

Products specifications

Hardened

Yes

Inside Diameter Chamfer

No

Material

Black Oxide

Quantity

Sold as a set of 10.

Size (ID/OD)

3/8 / 5/8

Thickness

.120in

Washer Finish

Black oxide

Washer Inside Diameter (in)

0.375 in.

Washer Inside Diameter (mm)

9.525 mm

Washer Material

Chromemoly

Washer Outside Diameter (in)

0.625 in.

Washer Outside Diameter (mm)

15.875 mm

Washer Thickness (in)

0.120 in.

Washer Thickness (mm)

3.048 mm

Best prices, fast shipping, good service. Thank you!

Low prices and super fast shipping.

Great prices and shipped promptly.

BEST PRICE AROUND, HANDS DOWN. Shipping was fast and communication was impeccable. THANKS FOR THE PROFESSIONALISM.

best prices around by far for the exact same product! Would definetely recomend autoplicity to a friend

the product was the cheapest price i could find on the web and shipping was quick i got the part in two days from purchase

Wonderful experience with seller. Ordered on a Monday night and received on Thursday. Talking about service. Man these guys are awesome. I will be ordering more in the future with Autoplicity. Thanks again!

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