McMaster 94895A031 SAE Grade 8 High Strength Steel Hex Nut, Zinc Yellow Chromate Plated, 3 8" 16 Thread Size, Pack of 100 4TLA1 15° Opening Angle Ratcheting Nonratcheting 15° Opening Angle Ratcheting Nonratcheting Appearance Polished For Use With Screws and Nuts Grade Industrial Number of Heads 2 System of Measurement Inch Country of Origin United States Full Flow Valves No Hex Nut Profile Standard Fastener Strength Rating High Material Zinc Yellow Chromate Plated Steel Thread Size 3 8" 16 Width 9 16" Height 21 64" Fastener Strength Grade Class SAE Grade 8 Drive Style External Hex Nut Type Hex Performance High Strength System of Measurement Inch Thread Direction Right Hand Thread Fit Unified Standard Class 2B Thread Spacing Coarse Thread Type UNC Pack Quantity 100 Country of Origin Canada DFARS Compliance Not Specialty Metals Compliant ECCN EAR99 Schedule B Number 731816 these are suitable for fastening most machinery and equipment