Cat® Black Colored Steel Button Head Screw for Seats and Accumulators. Screw Type: Machine Screw Head Type: Button Material: Steel,Corrosion Preventative Fluid,Alloy Steel,Nylon, 6, 6/12, 6/6 Plastic,Alloy Mixed: Metal,Alloy Zinc Coating: Zinc Flake-Black Locking Feature: Nylon Patch Hand of Thread: RH Bolt Type: Rounded Head (Pan) Class or Grade: ASTM A574 (180 ksi) Bolt Length (mm): 25.4 Thread Size (dia x pitch) (mm): 3/8×16 Grip Length (mm): 3.18