Spring WasherThis aftermarket spring washer adds preload to a bolted joint, keeping clamp force consistent as gaskets relax, vibration loosens fasteners, or thermal cycling moves the joint. Forklift drivetrain, engine, and hydraulic assemblies use them under bolt heads where retorque is impractical between service intervals. Fleet maintenance and independent shops keep them in stock because they get consumed during every overhaul. Sold as a crossover aftermarket replacement, not OEM branded. Verify bolt diameter, washer thickness, and spring rate against your application before installing, particularly on engine and transmission fasteners where torque-to-yield specs depend on washer behavior.Aftermarket replacement part, cross-references original part number AC01601-01030.Need help confirming fit? Call (562) 693-7748 with your serial number.Part number variants: AC01601-01030, ac01601-01030, AC0160101030, ac0160101030 ⚠ Warning: Some equipment has serial-number breaks that may not be reflected in the catalog. Contact us for clarification before ordering if uncertain.SCR Forklift Parts ships from Whittier, CA with next-day delivery available across the US when needed.