5/16 Machine Keys

Machine Keys, or Straight keys are made from hardened rod with a machined square or rectangular cross section, and are the most common type of key. They are installed into keyways to transmit torque from shafts to gears and other components. They are called “keys” because they lock a component to the shaft by means of a corresponding keyway in a shaft.

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SupplierLocTypeMaterialFinishSizeDescriptionQty 
JacksonMSMachine Key (Square & Rectangular)SteelPlain5/16 x 3/8 x 12key machine rectangle26
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JacksonMSMachine Key (Square & Rectangular)SteelPlain5/16 x 1/2 x 12key machine rectangle3
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JacksonMSMachine Key (Square & Rectangular)SteelPlain5/16 x 1key machine square263
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SWACOOHMachine Key (Square & Rectangular)SteelPlain5/16 x 5/16 x 12sq key 5/16 x 5/16 x 12 cs pln100
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NAPPCOTXMachine Key (Square & Rectangular)SteelZinc/Clear5/16 x 5/16 x 365/16 x 5/16 x 36 square key zp rohs14
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WDMBIAMachine Key (Square & Rectangular)SteelPlain5/16 x 5/16 x 1 5/8key mach us rnd 5/16x5/16x1 5/8 drw90
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WDMBIAMachine Key (Square & Rectangular)SteelPlain5/16 x .280 x 1 1/4key mach us rect b hard 5/16x.280x1 1/4140
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WDMBIAMachine Key (Square & Rectangular)SteelPlain5/16 x 5/16 x 2key mach us sq b 5/16x5/16x2319
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ManscoMIMachine Key (Square & Rectangular)SteelPlain5/16 x 5/16 x 12square key 1/box6
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ManscoMIMachine Key (Square & Rectangular)300 Stainless (A1,A2, 18-8,304,310 etc.)Plain5/16 x 5/16 x 3/4square key 18-8 s/s73
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ManscoMIMachine Key (Square & Rectangular)SteelPlain5/16 x 5/16 x 4 1/8square key287
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B & K FASTPAMachine Key (Square & Rectangular)SteelPlain5/165/16 machinery keys x 1 1/2443
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B & K FASTPAMachine Key (Square & Rectangular)SteelPlain5/165/16 machinery keys x 1 3/4289
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B & K FASTPAMachine Key (Square & Rectangular)SteelPlain5/165/16 machinery keys x 2 1/2916
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OBRIENOHMachine Key (Square & Rectangular)300 Stainless (A1,A2, 18-8,304,310 etc.)Plain5/16 x 5/16 x 1'5/16 x 5/16 x 1 ft kystk s/s2
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MidStatesMIMachine Key (Square & Rectangular)SteelPlain5/16 x 5/16machinery key-both ends rnd2
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MidStatesMIMachine Key (Square & Rectangular)SteelPlain5/16 x 5/16machinery key-both ends rnd3
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LibertyILMachine Key (Square & Rectangular)SteelZinc/Clear5/16 x 12square key zinc5
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LibertyILMachine Key (Square & Rectangular)SteelPlain5/16 x 2square key15
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LibertyILMachine Key (Square & Rectangular)SteelPlain5/16 x 1 1/2long special square key with .039 chamer on 2 corners per print per print200
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ISSCOMOMachine Key (Square & Rectangular)Grade 2Plain5/16 x 5/16 x 1 1/2square-.001/.000800
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ISSCOMOMachine Key (Square & Rectangular)Grade 2Plain5/16 x 5/16 x 1 1/4square-.001/.000750
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ISSCOMOMachine Key (Square & Rectangular)Grade 2Plain5/16 x 5/16 x 2square +.001/.0002685
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ISSCOMOMachine Key (Square & Rectangular)Grade 2Plain5/16 x 5/16 x 2 1/2square +.001/.000800
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ISSCOMOMachine Key (Square & Rectangular)SteelPlain5/16 x 1 1/4gib head key 5/16 taper505
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ISSCOMOMachine Key (Square & Rectangular)SteelPlain5/16 x 1 3/4gib head key 5/16 taper450
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ISSCOMOMachine Key (Square & Rectangular)SteelPlain5/16 x 1 1/2gib head key 5/16 taper2440
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ISSCOMOMachine Key (Square & Rectangular)SteelPlain5/16 x 2 3/4gib head key 5/16 taper455
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WurthINMachine Key (Square & Rectangular)SteelPlain5/16 x 5/16 x 1 1/25/16 x 5/16 x 1-1/2 gib head key steel 522725230
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TimberlineCOMachine Key (Square & Rectangular)SteelPlain5/16 x 1 3/4sq key st 5/16 x 1-3/4214
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