PBC Linear NIL12 012.000 Linear Shaft, Solid, 3 4 in Dia, 12 in Lg, Carbon Steel, Polished 8843746 so they're a better choice so they're a better choice where hazardous material is present in normal operating conditions Working Steam Pressure WSP 125 psi Body Material Valves Cast Iron Stem Material Brass Valve Stem Type Rising Bonnet Style Bolted Handle Material Cast Iron Wedge Material Cast Iron Max End Type Plain Ends Range (F) 0 Degrees 400 Degrees F Type Solid Shaft System of Measurement Inch Surface Roughness 8 uin Core Type Solid Roughness 8 12 uin RMS Shaft Type Solid Shaft Series NIL Tolerance Class L Operating Temperature Minimum 0 Degrees F Operating Temperature Maximum 400 Degrees F Surface Hardness Minimum 60 HRC End Type Plain Ends Weight Per Inch 0