ARP Stretch Gauges

Applicable for all fastener installations requiring precise preload measurement

Part #: 100-9943

Overview

The ARP Stretch Gauges are precision-engineered digital billet-style tools designed to help automotive enthusiasts, engine builders, and technicians accurately measure bolt stretch during assembly. Proper bolt preload is critical for ensuring the integrity, safety, and optimal performance of high-strength fasteners, especially in demanding applications such as high-performance engines, racing, and heavy-duty builds. Using a stretch gauge like this ensures that each bolt is tightened to the correct preload, preventing over-tightening or under-tightening that can lead to component failure or suboptimal performance.

Whether you're installing ARP rod bolts, head studs, main studs, or other critical fasteners, this gauge provides a reliable and straightforward method to monitor bolt stretch in real-time. Its digital display offers precise readings, making it easier than ever to achieve consistent, accurate torque-to-yield installations. This tool is ideal for professional engine builders, performance shops, and serious DIY enthusiasts who demand the highest level of accuracy during assembly.

Key Features

The ARP Stretch Gauges incorporate several advanced features designed for durability, precision, and ease of use:

• Heavy-Duty Springs: Equipped with extra heavy springs, these gauges are built to withstand repeated use in demanding workshop environments, ensuring long-lasting accuracy and reliability.
• Digital Billet-Style Design: Crafted from high-quality billet aluminum, the gauges combine durability with a sleek, professional appearance. The digital readout provides clear, easy-to-read measurements for precise preload monitoring.
• Insulated Plastic Carrying Case: Each gauge comes with a rugged, insulated plastic case that protects the tool during storage and transport, maintaining calibration and preventing damage.
• Accurate Measurement of Bolt Stretch: The gauge allows you to measure each bolt's static (free) length and monitor its stretch as you tighten, ensuring you achieve the manufacturer-recommended preload for your fasteners.
• Universal Compatibility: Designed to work with a wide range of fasteners, including ARP bolts and studs, as well as other high-performance fasteners requiring precise stretch measurement.

Construction & Design

The ARP Stretch Gauges are constructed from high-quality billet aluminum, ensuring strength and durability while maintaining a lightweight profile for ease of handling. The digital component features a high-precision sensor and a bright, easy-to-read display, allowing for quick and accurate readings even in tight engine bays or low-light conditions. The heavy-duty springs are engineered to provide consistent tension, enabling accurate measurement of bolt stretch across multiple uses. The inclusion of a protective plastic case ensures that the gauges remain in optimal condition, preserving calibration and extending the lifespan of the tool.

Performance & Benefits

Using a stretch gauge like the ARP model significantly improves the accuracy of fastener installation compared to traditional torque-only methods. By directly measuring bolt stretch, you can ensure each fastener is tightened to the exact preload specified by the manufacturer, which is essential for high-performance and high-stress applications. Proper preload helps prevent bolt fatigue, loosening, or failure, ultimately contributing to the longevity and reliability of your engine assembly. The digital display enhances precision, reducing guesswork and increasing confidence during critical assembly steps.

Installation & Fitment

The ARP Stretch Gauges are designed for straightforward use; simply insert the gauge onto the bolt or stud, tighten until the desired measurement is displayed, and monitor the readings as you torque the fastener. No special tools, modifications, or tuning are required. This gauge is compatible with a wide range of fasteners and can be used in various engine assembly scenarios, making it a versatile addition to any toolkit.

• Easy-to-use digital display for precise measurement
• Compatible with most high-performance fasteners requiring stretch measurement
• No calibration or special setup needed for standard use

What's Included

• ARP Digital Billet-Style Stretch Gauge
• Heavy-duty, insulated plastic carrying case
• Instruction manual for proper usage and calibration

Ideal For

• Engine builders and performance shops
• DIY enthusiasts performing high-performance engine assembly
• Anyone seeking accurate bolt preload measurement for critical fasteners

Emissions Note

This product is a specialized tool for fastener measurement and does not impact vehicle emissions. It is intended for use during engine assembly and maintenance, ensuring proper fastener preload and engine integrity.