Wrist Pin 51 Series (1) .927 2.950 .150 139 gram

The Wrist Pin 51 Series .927 2.950 .150 139 gram from JE Pistons is a precision-engineered connecting rod pin designed for high-performance and race engine builds where weight savings and durability are critical. As an engine builder or serious automotive enthusiast, you understand that every gram removed from reciprocating mass translates directly to reduced inertial losses, faster acceleration, and higher engine responsiveness. This wrist pin serves as the critical pivot point between your connecting rod and piston, requiring extreme precision in diameter, length, and wall thickness to ensure proper clearance, load distribution, and longevity under sustained high-RPM operation.

Manufactured by JE Pistons—an industry leader in forged piston technology—this wrist pin features a .927-inch outer diameter and 2.950-inch length, with a .150-inch wall thickness that balances strength and weight. The 51 Series designation indicates this pin is optimized for specific application requirements, offering the rigorous tolerances necessary for reliable assembly and consistent performance across thousands of combustion cycles. At 139 grams, this pin is engineered for builders targeting weight reduction in high-revving applications, such as road racing, autocross, or naturally aspirated performance engines where minimizing reciprocating mass directly improves acceleration response and reduces stress on supporting components like rods and bearings.

This wrist pin is ideal for engine builders and machine shops assembling custom or rebuilt high-performance powerplants. Proper installation requires careful honing of the connecting rod pin bore and piston pin boss to ensure exact clearance specifications—typically between .0005 and .0015 inches, depending on your engine's thermal expansion characteristics and intended duty cycle. Verify the pin's compatibility with your specific connecting rod and piston set before ordering, as dimensional precision is non-negotiable in race engine assembly; working with OEM documentation or technical guidance from your engine kit supplier ensures the correct fit and optimal load transfer throughout the rotating assembly.