Hitch Pin Pin Diameter 1/2 in Shank Diameter 1/2 in Shank Length 4 in Pin Type Detent Material Steel Material Grade/Class Grade 1038/Grade 4140 Finish Zinc Plated Usable Length 4 in Product Type Hitch Pins System of Measurement Inch Maximum Hole Size 0.253 in Minimum Hole Size 0.203 in Head Diameter 5/32 in Material Quality Standards Not Applicable Dimensional Standards Not Applicable Pack Size Small Pack Head Diameter Tolerance +0.05/-0.00 in