Tapered Gib Head Machine Key, Tapered Gib End, Steel, Plain, 6 in L, 7/8 in SqMfr # WWG 0875 6000GB Item Machine Key System of Measurement Inch Type Tapered Gib Head End Type Tapered Gib Square 7 8 in Material Steel Finish Plain Tensile Strength (PSI) 64,000 psi Thickness Tolerance +0. 002 in Application Holds Pulleys and Gears on Transmission Shafts Rockwell Hardness B85 Features Tapers 1 8 in per ft Made in North America Yes Material Grade Class Ungraded End Profile Tapered Gib Key Type Bilateral Tensile Strength 64,000 psi