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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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Buy Machine Keys from one of our FCH Network Members
SupplierLocTypeMaterialFinishSizeDescriptionQty 
MidStatesMIMachine Key (Square & Rectangular)SteelPlain3/8 x 1/4machinery key-both ends rnd 1-92
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EndriesWIMachine Key (Square & Rectangular)SteelPlain3/8 x 5/16 x 33/8x5/16x3in undersized rectangular machine key plain130
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WDMBIAMachine Key (Square & Rectangular)SteelPlain3/8 x 3/8 x 2key mach us sq b 3/8x3/8x2 (W040)651
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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 rohs 8
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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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NAPPCOTXMachine Key (Square & Rectangular)SteelZinc/Clear3/8 x 3/8 x 363/8x3/8x36 square key zp rohs10
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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 123/8x3/8x12 square key 18-8 s/s 1/box4
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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/s124
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SWACOOHMachine Key (Square & Rectangular)SteelPlain3/8 x 3/8 x 23/8x3/8x2 cut key18
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Wurth IndINMachine Key (Square & Rectangular)SteelPlain3/8 x 3/8 x 2 1/4key mach b us 1018 pl 3/8x3/8x2 1/4 steel plain2107
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WINAMNMachine Key (Square & Rectangular)AluminumPlain3/8 x 3/8 x 2 1/4key mach b us 1018 pl 3/8x3/8x2 1/42107
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Wurth IndINMachine Key (Square & Rectangular)SteelPlain3/8 x 3/8 x 3key mach b us 1018 pl 3/8x3/8x3 steel plain340
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WINAMNMachine Key (Square & Rectangular)AluminumPlain3/8 x 3/8 x 3key mach b us 1018 pl 3/8x3/8x3340
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JacksonMSMachine Key (Square & Rectangular)SteelPlain3/8 x 1/2 x 12key machine rectangle20
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JacksonMSMachine Key (Square & Rectangular)SteelPlain3/8 x 5/8 x 12key machine rectangle6
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LibertyILMachine Key (Square & Rectangular)SteelPlain3/8 x 7/8square key500
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Field FasILMachine Key (Square & Rectangular)SteelPlain3/8 x 13/8 x 1 square key oversized stl pln494
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Field FasILMachine Key (Square & Rectangular)300 Stainless (A1,A2, 18-8,304,310 etc.)Plain3/8 x 1 1/83/8 x 1 1/8 square key undersize rd ends 18-8 ss a/f .373/.375984
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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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WDMBIAMachine Key (Square & Rectangular)SteelPlain3/8 x 1.30key square rd/end hrd st 3/8x1.30l drw100
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EndriesWIMachine Key (Square & Rectangular)300 Stainless (A1,A2, 18-8,304,310 etc.)Plain3/8 x 1 5/163/8x1-5/16 18-8 s/s steel square machine key25
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ISSCOMOMachine Key (Square & Rectangular)SteelPlain3/8 x 1 1/2gib head key 5/16 taper1216
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EndriesWIMachine Key (Square & Rectangular)SteelPlain3/8 x 1 1/23/8x1-1/2 square machine key undersized plain259
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EndriesWIMachine Key (Square & Rectangular)SteelPlain3/8 x 1 9/163/8x1-9/16 1018 steel square machine key undersized plain425
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RevcarVAMachine Key (Square & Rectangular)SteelPlain3/8 x 1 5/8sq key sq ends550
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Field FasILMachine Key (Square & Rectangular)SteelPlain3/8 x 1 5/83/8x1 5/8 square key undersize 1045 alloy stl pln212
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WDMBIAMachine Key (Square & Rectangular)SteelPlain3/8 x 1 7/8key mch sq a rc40 undr st 3/8x1 7/8 drw (W010) (W010)742
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Field FasILMachine Key (Square & Rectangular)SteelPlain3/8 x 1 7/83/8 x 1 7/8 square key oversize alloy rc40-50 round ends stl pln900
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LibertyILMachine Key (Square & Rectangular)SteelPlain3/8 x 2square key70
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Field FasILMachine Key (Square & Rectangular)SteelPlain3/8 x 23/8 x 2 square key oversized round ends alloy stl rc40-50 heat treat pln300
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Field FasILMachine Key (Square & Rectangular)SteelPlain3/8 x 2 1/83/8 x 2 1/8 square key oversize stl pln_x000d_a/f .375-.376250
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WDMBIAMachine Key (Square & Rectangular)SteelZinc/Clear3/8 x 2 1/4pin snap square 2wire steel (zt) 3/8x2 1/4el (W030) (W030) (W030)507
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ISSCOMOMachine Key (Square & Rectangular)SteelPlain3/8 x 2 1/4gib head key 5/16 taper525
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EndriesWIMachine Key (Square & Rectangular)SteelPlain3/8 x 24.153/8x24.15 square machine key undersized plain2
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CenturyFLMachine Key (Square & Rectangular)SteelPlain3/8 x 2 1/23/8 x 2 1/2 square key (RC-32-48) (RC-32-48) 5
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EndriesWIMachine Key (Square & Rectangular)SteelPlain3/8 x 2 5/83/8x2-5/8 square machine key undersized plain368
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ISSCOMOMachine Key (Square & Rectangular)SteelPlain3/8 x 3 1/2gib head key 5/16 taper250
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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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WDMBIAMachine 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 1/2 (W020) (W020)447
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WDMBIAMachine Key (Square & Rectangular)SteelPlain3/8 x 3.88gib key steel (pl) 3/8(+.001)x3.88 (W0M0)59
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Field FasILMachine Key (Square & Rectangular)SteelPlain3/8 x 7 1/23/8x7 1/2 square key oversized stl pln564
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EndriesWIMachine Key (Square & Rectangular)SteelPlain3/8 x 9 5/83/8x9-5/8 square key +.001-.00020
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EndriesWIMachine Key (Square & Rectangular)SteelPlain3/8 x 103/8x10 square machine key oversized +.001/-.000 plain25
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EndriesWIMachine Key (Square & Rectangular)SteelPlain3/8 x 11 1/23/8x11-1/2 square key +.001-.000196
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LibertyILMachine Key (Square & Rectangular)SteelZinc/Clear3/8 x 12square key18
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EndriesWIMachine Key (Square & Rectangular)SteelPlain3/8 x 1 5/83/8x1-5/8 square machine key undersized plain340
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EndriesWIMachine Key (Square & Rectangular)SteelPlain3/8 x 15 .0013/8x15 square key +.001-.00026
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EndriesWIMachine Key (Square & Rectangular)SteelPlain3/8 x 11 .0013/8x11 square key +.001-.00040
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EndriesWIMachine Key (Square & Rectangular)SteelPlain3/8 x 12 .0013/8x12 square key +.001-.00054
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EndriesWIMachine Key (Square & Rectangular)SteelPlain3/8 x 23/8x2 square machine key undersized plain1000
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EndriesWIMachine Key (Square & Rectangular)SteelPlain3/8 x 6.18753/8x6.1875 1018/1020 steel square machine key undersized plain184
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EndriesWIMachine Key (Square & Rectangular)SteelPlain3/8x4 square machine key undersized plain |276
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EndriesWIMachine Key (Square & Rectangular)SteelPlain3/8x3 square machine key undersized plain |362
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EndriesWIMachine Key (Square & Rectangular)SteelPlain3/8 x 1 3/43/8x1-3/4 1045 square machine key undersized689
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EndriesWIMachine Key (Square & Rectangular)SteelPlain3/8 x 1 3/43/8x1-3/4 square machine key undersized plain1000
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NutsBoltsNEMachine Key (Square & Rectangular)SteelPlain3/83/8 square snap wire pin76
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CenturyNYMachine Key (Square & Rectangular)SteelPlain3/8 x 2 1/2 square key rc-32-4825
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