Rod Bolt Stretch Gauge Tool

ARP 100-9942 Rod Bolt Stretch Gauge Tool

The ARP 100-9942 rod bolt stretch gauge is the most accurate way to measure rod bolt preload during engine assembly. Using bolt stretch rather than torque readings ensures the correct clamping load is applied to the connecting rod fasteners, which is critical for high-performance and racing engines.

Torque values can vary due to friction, lubricant differences, or thread condition. Measuring rod bolt stretch directly eliminates these variables and confirms the correct preload has been achieved.

To use the ARP stretch gauge, first measure the overall length of the rod bolt before installation. As the bolt is tightened, monitor the bolt stretch with the gauge until the manufacturer’s specified stretch value is reached. When the correct stretch is achieved, the proper clamping load has been applied.

Professional engine builders often record the before and after measurements for every rod bolt during assembly. If a bolt shows a permanent increase in length of 0.0005" or more, or any signs of deformation, the bolt should be replaced immediately.

The ARP rod bolt stretch gauge tool features a precision dial indicator that reads in 0.0005" increments and heavy-duty springs for consistent and repeatable measurements. Supplied in a protective storage case, this tool is an essential piece of equipment for accurate engine building.

ARP 100-9942 Rod Bolt Stretch Gauge Features

• Measures rod bolt stretch accurately during engine assembly

• Ensures correct rod bolt preload and clamping force

• Precision dial indicator reads in 0.0005" increments

• Heavy spring design for consistent measurements

• Supplied in a protective storage case

• Essential tool for engine builders, performance workshops, and race engine assembly

The ARP 100-9942 stretch gauge is a must-have tool when installing ARP rod bolts and other critical engine fasteners where bolt stretch measurement is recommended.