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.MaterialMaterialHeat TreatFinishDFARSRoHSMild Steel-Zinc Plated Clear Chromate✔✔Parts SpecificationA ThreadB(inch)C(inch)D Min(inch)D Max(inch)E (inch)Force At E Max Compression (lbs)F (inch)5/16-182-23/32 inch1/2 inch1-11/16 inch1-7/8 inch1/4 inch100 lbs5/8 inch