Spring-Loaded SpindlesClamps with strong spring force to compensate for varying part thicknesses. Excellent for clamping casting or other parts that can vary in size. Fully threaded for maximum adjustment range. Assembly includes two jam nuts, a die spring, and a bolt retainer. To install, weld bolt retainer to clamping arm.MaterialMaterialHeat TreatFinishDFARSRoHSMild Steel-Zinc Plated Clear Chromate✔✔Parts SpecificationA ThreadBCD MinD MaxEForce At E Max Compression (lbs.)F1/4-202-3/16"7/16"1-9/32"1-3/8"1/4"50lbs.5/8"