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3/16 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 
WDMBIAMachine Key (Square & Rectangular)SteelPlain3/16 x 1/8 x 1/2key rectangular st (pl) 3/16x1/8x1/2 drw (W000) (W000) (W000)2,490
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WDMBIAMachine Key (Square & Rectangular)SteelPlain3/16 x 3/16 x 3/4key mach us sq b hard 3/16x3/16x3/4 (W050)303
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NAPPCOTXMachine Key (Square & Rectangular)SteelZinc/Clear3/16 x 3/16 x 363/16 x 3/16 x 36 square key zp rohs 5
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ManscoMIMachine Key (Square & Rectangular)SteelPlain3/16 x 3/16 x 13/163/16x3/16x13/16 square key pln718
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ManscoMIMachine Key (Square & Rectangular)SteelPlain3/16 x 3/16 x 1 29/323/16x3/16x1-29/32 square key pln391
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IRFNJMachine Key (Square & Rectangular)BrassPlain3/16 x 3/16 x 1 1/2long square key1039
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IRFNJMachine Key (Square & Rectangular)BrassPlain3/16 x 3/16 x 1 1/2long square key1039
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ISSCOMOMachine Key (Square & Rectangular)Grade 2Plain3/16 x 3/16 x 2 1/8square-.001/.0002000
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MidStatesMIMachine Key (Square & Rectangular)SteelPlain3/16 x 3/16sq machinery key 2-1/22
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MidStatesMIMachine Key (Square & Rectangular)SteelPlain3/16 x 3/16 x .8753/16 x 3/16 x .875 machine key200
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LibertyILMachine Key (Square & Rectangular)SteelPlain3/16 x 3/16 x 1machine key oversized square ends100
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HayesCAMachine Key (Square & Rectangular)SteelPlain3/16 x 3/16 x 3/4ms20066-183 3/16 x 3/16 x 3/4 gr c keystock steel300
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NAPPCOTXMachine Key (Square & Rectangular)SteelZinc/Clear3/16 x 3/16 x 363/16x3/16x36 square key zp rohs5
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SWACOOHMachine Key (Square & Rectangular)SteelPlain3/16 x 3/16 x 12sq key 3/16x3/16x12 cs pln55
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SWACOOHMachine Key (Square & Rectangular)SteelPlain3/16 x 3/16 x 13/16x3/16x1 cut key594
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ManscoMIMachine Key (Square & Rectangular)SteelPlain3/16 x 3/16 x 1-5/16 square key pln250
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ManscoMIMachine Key (Square & Rectangular)300 Stainless (A1,A2, 18-8,304,310 etc.)Plain3/16 x 3/16 x 1 1/43/16x3/16x1-1/4 square key 18-8 s/s100
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WINAMNMachine Key (Square & Rectangular)AluminumPlain3/16 x 3/16 x 3key mach b os 1018 pl 3/16x3/16x3500
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WINAMNMachine Key (Square & Rectangular)AluminumPlain3/16 x 3/16 x 7/8key mach b us 1018 pl 3/16x3/16x7/81290
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ManscoMIMachine Key (Square & Rectangular)SteelPlain3/16 x 3/16 x 29/323/16 x 3/16 x 29/32 square key pln15
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SWACOOHMachine Key (Square & Rectangular)SteelPlain3/16 x 3/16 x 1 3/83/16x3/16x1 3/8 cut key762
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SWACOOHMachine Key (Square & Rectangular)SteelPlain3/16 x 3/16 x 1 1/23/16x3/16x1 1/2 cut key +.001/-.000934
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ManscoMIMachine Key (Square & Rectangular)SteelPlain3/16 x 3/16 x 1 1/83/16x3/16x1-1/8 square key pln204
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SWACOOHMachine Key (Square & Rectangular)SteelPlain3/16 x 3/16 x 3/43/16x3/16x3/4 cut key +.001/-.000311
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ManscoMIMachine Key (Square & Rectangular)SteelPlain3/16 x 3/16 x 2 5/83/16 x 3/16 x 2-5/8 square key pln11
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ManscoMIMachine Key (Square & Rectangular)SteelPlain3/16 x 3/16 x 11/163/16x3/16x11/16 square key pln485
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WINAMNMachine Key (Square & Rectangular)AluminumPlain3/16 x 3/16 x 3key mach b us 1018 pl 3/16x3/16x35192
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SWACOOHMachine Key (Square & Rectangular)SteelPlain3/16 x 3/16 x 1 1/43/16x3/16x1 1/4 cut key +.001/-.000254
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Wurth IndINMachine Key (Square & Rectangular)SteelPlain3/16 x 3/16 x 3key mach b us 1018 pl 3/16x3/16x3 steel plain5192
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Wurth IndINMachine Key (Square & Rectangular)SteelPlain3/16 x 3/16 x 3key mach b os 1018 pl 3/16x3/16x3 steel plain500
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Wurth IndINMachine Key (Square & Rectangular)SteelPlain3/16 x 3/16 x 7/8key mach b us 1018 pl 3/16x3/16x7/8 steel plain1290
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WDMBIAMachine Key (Square & Rectangular)SteelPlain3/16 x 1/4 x 1 7/64key rect st (pl) 3/16x1/4x1 7/6432
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Field FasILMachine Key (Square & Rectangular)SteelPlain3/16 x 1/4 x 11/163/16 x 1/4 x 11/16 rectangular key oversized alloy stl rc40-50 pln140
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SWACOOHMachine Key (Square & Rectangular)SteelPlain3/16 x 1/4 x .863/16x1/4x.86 cut key100
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EndriesWIMachine Key (Square & Rectangular)SteelPlain3/16 x 1/23/16x1/2 oversized square machine key plain round both ends1457
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IPCVAMachine Key (Square & Rectangular)SteelPlain3/16 x 9/163/16x9/16 sq. key one end rnd. c of c req. (jg1-3/16x9) per mes-0007 spec685
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EndriesWIMachine Key (Square & Rectangular)SteelPlain3/16x9/16 square machine key undersized plain6
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IPCVAMachine Key (Square & Rectangular)SteelPlain3/16 x 5/83/16x5/8 sq. key rnd ends c of c req. per mes-0007 spec (jf1-3/16x10)313
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WDMBIAMachine Key (Square & Rectangular)300 Stainless (A1,A2, 18-8,304,310 etc.)Plain3/16 x 3/4key mach square b under sst 303 3/16x3/4 (W0C0)5,040
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IPCVAMachine Key (Square & Rectangular)SteelPlain3/16 x 3/43/16x3/4 sq. key rnd ends c of c req. per mes spec 007 (jf1-3/16x12)384
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IPCVAMachine Key (Square & Rectangular)SteelPlain3/16 x 3/43/16x3/4 sq. key one end rnd. including mil-test report identifying the material heat treat tensile and yield per mes-0007 spec (jg1-3/16x12)135
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LibertyILMachine Key (Square & Rectangular)SteelPlain3/16 x 7/8square key2,000
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CenturyNYMachine Key (Square & Rectangular)SteelPlain3/16 x 7/8 square key steel10
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Field FasILMachine Key (Square & Rectangular)SteelPlain3/16 x 7/83/16 x 7/8 square key undersize stl pln2650
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EndriesWIMachine Key (Square & Rectangular)SteelPlain3/16 x 15/163/16x15/16 square machine key undersized plain100
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IPCVAMachine Key (Square & Rectangular)SteelPlain3/16 x 15/163/16x15/16 sq. key one end rnd. c of c req. per mes-0007 spec326
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WDMBIAMachine Key (Square & Rectangular)SteelPlain3/16 x 1key mach square under st (pl) 3/16x1 (W0C0)28,000
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Purchase MOMachine Key (Square & Rectangular)SteelPlain3/16 x 13/16 x 1 square key211
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CenturyFLMachine Key (Square & Rectangular)SteelPlain3/16 x 13/16 x 1 square key steel 795
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IPCVAMachine Key (Square & Rectangular)SteelPlain3/16 x 13/16x1 sq. key one end rnd. c of c req. per mes-0007 spec356
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EndriesWIMachine Key (Square & Rectangular)SteelPlain3/16 x 13/16x1 square machine key undersized plain200
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HewesNYMachine Key (Square & Rectangular)SteelPlain3/16 x 13/16x 1 sqr key276
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Field FasILMachine Key (Square & Rectangular)SteelPlain3/16 x 13/16 x 1 square key round ends undersize stl pln296
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CenturyNYMachine Key (Square & Rectangular)SteelPlain3/16 x 1 square key steel795
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HewesNYMachine Key (Square & Rectangular)SteelPlain3/16 x 1 1/8sqr keysundersize stl140
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IPCVAMachine Key (Square & Rectangular)SteelPlain3/16 x 1 3/163/16x1 3/16 sq. key rnd ends c of c req. per mes-0007 spec (jf1-3/16x19)64
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JacksonMSMachine Key (Square & Rectangular)SteelPlain3/16 x 1 1/4key machine square43
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WSBKYMachine Key (Square & Rectangular)300 Stainless (A1,A2, 18-8,304,310 etc.)Plain3/16 x 1 1/4key mach sqr b under (18-8) 3/16x1 1/412,000
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EndriesWIMachine Key (Square & Rectangular)SteelPlain3/16x1-1/4 square machine key undersized plain25
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LibertyILMachine Key (Square & Rectangular)SteelPlain3/16 x 1 1/4square key150
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WDMBIAMachine Key (Square & Rectangular)300 Stainless (A1,A2, 18-8,304,310 etc.)Plain3/16 x 1 1/4key mach sqr b under (18 8) 3/16x1 1/4 (W020) (W020)12,000
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HewesNYMachine Key (Square & Rectangular)SteelPlain3/16 x 1 1/43/16 x 1-1/4 sqr key500
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LibertyILMachine Key (Square & Rectangular)SteelPlain3/16 x 1 9/32 x 5/323/16 x 1 9/32 x 5/32 rect. key plain plain K15018N01285
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CenturyFLMachine Key (Square & Rectangular)SteelPlain3/16 x 1 3/83/16 x 1 3/8 square key (STEEL) (STEEL) 50
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LibertyILMachine Key (Square & Rectangular)SteelPlain3/16 x 1 3/8square key90
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CenturyNYMachine Key (Square & Rectangular)SteelPlain3/16 x 1 3/8 square key steel100
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IPCVAMachine Key (Square & Rectangular)SteelPlain3/16 x 1 1/23/16x1 1/2 sq. key one end rnd. including mil-test reports identifying the material heat treat tensile and yield per mes-0007 spec (jg1-3/16x24)57
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Field FasILMachine Key (Square & Rectangular)SteelPlain3/16 x 1 1/23/16 x 1 1/2 square key oversized alloy stl rc 40-50 heat treat pln400
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Field FasILMachine Key (Square & Rectangular)SteelPlain3/16 x 1 1/23/16 x 1 1/2 square key undersize hardened stl pln160
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HewesNYMachine Key (Square & Rectangular)SteelPlain3/16 x 2sqr keys90
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LibertyILMachine Key (Square & Rectangular)SteelPlain3/16 x 2square key80
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IPCVAMachine Key (Square & Rectangular)SteelPlain3/16 x 2 1/83/16x2 1/8 sq. key rnd ends c of c req. per mes-0007 spec (jf1-3/16x34)32
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LibertyILMachine Key (Square & Rectangular)SteelPlain3/16 x 12square key4
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LibertyILMachine Key (Square & Rectangular)SteelZinc/Clear3/16 x 12square key5
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EndriesWIMachine Key (Square & Rectangular)SteelPlain3/16 x 2 1/23/16 x 2 1/2 sq machine key .001 oversize45
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LibertyILMachine Key (Square & Rectangular)300 Stainless (A1,A2, 18-8,304,310 etc.)Plain3/16 square key (+0/-.002) x 1-11/64 overall length form b 18-8 stainless steel1
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EndriesWIMachine Key (Square & Rectangular)300 Stainless (A1,A2, 18-8,304,310 etc.)Plain3/16 x 3 1/23/16 x 3 1/2 sq machine key 304ss45
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