Automotive Racing Products, Inc.

The World Leader in racing fastener technology since 1968

If you're installing our diesel kit, make sure you're using ARP Ultra-Torque™ fastener assembly lubricant

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We Take Quality Seriously

ARP ISO 9001 and AS9100 Certifications

ARP achieved ISO 9001 and AS9100 registration in 2009. These registrations represent ARP's unwavering dedication to producing quality fasteners, continually improving our quality management system and delivering total customer satisfaction.

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  Fastener Technology Overview

   Design   Installation   Metallurgy   Torque/Stretch: U.S.   Torque/Stretch: Metric   Failures

World-leading Fastener Technology

ARP started applying technology to race fastener design and manufacturing in 1968. We'll discuss five components of fastener technology in detail.

design

Today's critical diesel fasteners - head studs and bolts, main studs and bolts, and driveline - have been designed stronger than ever before to handle the extreme loads. As a results, installation pre-loads - the amount the fastener is stretched during installation - are very high.   more on DESIGN

installation methods

There are three methods that can be employed to determine how much tension is exerted on a fastener; using a torque wrench, measuring the amount of stretch, and turning the fastener a pre-determined amount (torque angle). Of these methods, use of a stretch gauge is the most accurate.   more on INSTALLATION

metallurgy

The following material is intended to provide a brief overview of the metallurgical considerations that influence the design and production of the most reliable fasteners in motorsports. It is hoped that a simple understanding of the knowledge and commitment required to produce this reliability will make your future fastener decisions much, much easier.   more in METALLURGY

stretch and torque

This section includes a detailed charts of rod bolt stretch and torque specs for the various fasteners we make now.   more on TORQUE

recognizing common failures

There are six types of metallurgical failures that affect fasteners. Each type has unique identifying physical characteristics. The following examples are designed to be used like a spark plug reading chart to help analyze fastener failures.
more on FAILURES

Fastener Technology
1. Design   2. Installation   3. Metallurgy   4. Torque   5. Failures

Technical Support

Questions about which kit to use, torque values or your specific installation.

Hours
M-F 7:30a-4:30p PST
800-826-3045 or
805-339-2200

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FAQs - Frequently Asked Questions

We've answered several of the most common questions we get. Check here before you call or submit a questions online and you may save yourself some time.

Answers to FAQs