3/8 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)SteelPlain3/8 x 5/8 x 12key machine rectangle6
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JacksonMSMachine Key (Square & Rectangular)SteelPlain3/8 x 1/2 x 12key machine rectangle20
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SWACOOHMachine Key (Square & Rectangular)SteelPlain3/8 x 3/8 x 12sq key 3/8 x 3/8 x 12 cs pln167
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NAPPCOTXMachine Key (Square & Rectangular)SteelZinc/Clear3/8 x 3/8 x 363/8 x 3/8 x 36 square key zp rohs50
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Wurth ConNYMachine Key (Square & Rectangular)SteelZinc/Clear3/8 x 63/8 x 6 square key both ends square form b steel zinc clear trivalent1945
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WDMBIAMachine Key (Square & Rectangular)SteelPlain3/8 x 1/2 x 1 3/4key mach us rect b 3/8x1/2x1 3/4315
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WDMBIAMachine Key (Square & Rectangular)SteelPlain3/8 x 3/8 x 2key mach us sq b 3/8x3/8x2675
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WDMBIAMachine Key (Square & Rectangular)SteelPlain3/8 x 3/8 x 3 1/2key mach us sq b hard 3/8x3/8x3 1/2250
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WDMBIAMachine Key (Square & Rectangular)SteelPlain3/8 x 3/8 x 1 5/8key mach us sq b hard 3/8x3/8x1 5/816
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WDMBIAMachine Key (Square & Rectangular)SteelPlain3/8 x 3/8 x 3 3/4key mach us sq b hard 3/8x3/8x3 3/4573
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ManscoMIMachine Key (Square & Rectangular)SteelPlain3/8 x 3/8 x 12 13/8x3/8x12 square key 10/box5
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ManscoMIMachine Key (Square & Rectangular)SteelPlain3/8 x 1/2 x 1 1/4undersize machine key19
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Irwin IndOntMachine Key (Square & Rectangular)300 Stainless (A1,A2, 18-8,304,310 etc.)Plain3/8 x 3/8 x 1.0003/8 x 3/8 x 1.000 machine key undersize stainless steel16
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ManscoMIMachine Key (Square & Rectangular)300 Stainless (A1,A2, 18-8,304,310 etc.)Plain3/8 x 3/8 x 1 1/4square key 18-8 s/s174
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B & K FASTPAMachine Key (Square & Rectangular)SteelPlain3/83/8 machinery keys x 1 1/2276
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B & K FASTPAMachine Key (Square & Rectangular)SteelPlain3/83/8 machinery keys x 2 1/2452
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MidStatesMIMachine Key (Square & Rectangular)SteelPlain3/8 x 1/4machinery key-both ends rnd 1-92
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WSBKYMachine Key (Square & Rectangular)300 Stainless (A1,A2, 18-8,304,310 etc.)Plain3/8 x 3 1/2key mach sqr b under (18-8) 3/8x3 1/2624
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LibertyILMachine Key (Square & Rectangular)SteelPlain3/8 x 2square key70
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LibertyILMachine Key (Square & Rectangular)SteelPlain3/8 x 7/8square key500
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LibertyILMachine Key (Square & Rectangular)SteelZinc/Clear3/8 x 12square key18
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ISSCOMOMachine Key (Square & Rectangular)Grade 2Plain3/8 x 3/8 x 1square +.001/.0001040
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ISSCOMOMachine Key (Square & Rectangular)Grade 2Plain3/8 x 3/8 x 2 1/2square +.001/.000375
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ISSCOMOMachine Key (Square & Rectangular)Grade 2Plain3/8 x 3/8 x 1 1/2square +.001/.0004630
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ISSCOMOMachine Key (Square & Rectangular)SteelPlain3/8 x 1 1/2gib head key 5/16 taper1216
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ISSCOMOMachine Key (Square & Rectangular)SteelPlain3/8 x 3 1/2gib head key 5/16 taper250
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ISSCOMOMachine Key (Square & Rectangular)SteelPlain3/8 x 2 1/4gib head key 5/16 taper525
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RevcarVAMachine Key (Square & Rectangular)SteelPlain3/8 x 1 5/8sq key sq ends550
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WurthINMachine Key (Square & Rectangular)SteelPlain3/8 x 1 1/43/8 x 1-1/4 square key class 2 c1018 w/ chamfered ends per print 8212 rev 06422
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SBSMAMachine Key (Square & Rectangular)SteelPlain3/8 x 5/8 x 2mach rectangular key
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