The ARP Stretch Gauge is designed to measure the length of connecting rod bolts , as the bolt length can change during tightening (torque). This measurement method is the most accurate and reliable way to ensure that the bolt is properly pre-loaded .
Measuring strain is a more recommended method than using torque alone, especially in performance and racing applications.
Features
- Billet aluminum construction
- Black anodized finish
- Extremely stiff springs to ensure consistent and repeatable measurement results
- Comes with a durable, insulated plastic storage case for protection
- An essential tool for the serious engine builder
More information and user manual
Always follow the bolt manufacturer's instructions .
- Measure the bolt length before installation
- Monitor the total length of the bolt during tightening
When the bolt has stretched to the amount specified by the manufacturer, the correct preload or tightening torque has been achieved .
ARP recommends keeping a record of all connecting rod bolts , noting the bolt length before and after installation.
If the bolt length has permanently increased by 0.001" (≈0.025 mm) or more or if any deformation is observed in the bolt , the bolt should be replaced immediately .
Don't take any risks – safety is the foundation of everything when it comes to critical engine components.