A-B1697099-AI PIN-PISTON/STDOne New Aftermarket Replacement Standard Piston Pin Fits Briggs and Stratton Engines This standard (STD) piston pin (also known as a wrist pin or gudgeon pin) is a precision machined engine component that connects the piston to the connecting rod, transferring combustion force through the engine's bottom end. It is used during standard engine rebuilds and piston replacement service on Fits Briggs and Stratton small engines commonly found in lawn and