Keyed Shafting Dia. tolerance: -0.001/-0.0025 Key width tolerance: +0.003/-0.000 Straightness tolerance: 0.012 per ft. All material is furnished as cold-drawn, ground, and polished. Manufactured to ANSI B17.1-1967, R1973 standards. This listing is for each. Item : Keyed Shaft Standards : ANSI B17.1-1967, R1973, ASTM A-108 Material : Carbon Steel Grade 1045 Keyway : 3/16 x 3/32 Length : 12 Diameter : 7/8 in Country of Origin (subject to change) : United States