Rod Bolt Stretch Gauge

The PROFORM Rod Bolt Stretch Gauge is a precision measuring instrument designed for engine builders, machine shops, and technical professionals who need to verify bolt stretch and preload with exacting accuracy. This adjustable-length dial indicator gauge delivers 0.001-inch measurement increments, allowing users to monitor the elastic elongation of bolts under tension—a critical parameter in high-performance engine assembly, fastener validation, and quality control workflows.

Constructed with an aluminum body for durability without excessive weight, the gauge accommodates variable bolt lengths through its adjustable design, making it compatible with a range of fastener sizes commonly encountered in automotive, aerospace, and industrial applications. The dial indicator provides immediate visual feedback, eliminating guesswork when establishing proper bolt tension sequences. At 0.54 lbs and compact dimensions (9.85 x 5 x 10.6 inches), the tool remains portable enough for field use while maintaining the rigidity necessary for accurate readings.

This gauge is essential for users who require objective, repeatable bolt preload measurement—engine builders validating cylinder head bolt stretch during assembly, technicians certifying critical fastener applications, or shops maintaining ISO/AS9100 documentation standards. The precision measurement capability helps prevent under-torqued fasteners (leak paths, joint failure) and over-torqued conditions (fastener yield, surface damage) by providing a data-driven reference point independent of torque wrench calibration drift.

PROFORM's rod bolt stretch gauge fills a gap between basic torque specifications and advanced ultrasonic bolt measurement systems, offering a cost-effective, hands-on solution for shops that demand accuracy without laboratory-grade equipment. Single-unit purchase.