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3/8 Machine Keys
Machine Keys, or Parallel 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.
64 results, (click on any line for more information)
| Buy Machine Keys from one of our FCH Network Members | ||||||||
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| Supplier | Loc | Type | Material | Finish | Size | Description | Qty | |
| Century | FL | Machine Key (Square & Rectangular) | Plain | 3/8 x 2 1/2 | 3/8 x 2 1/2 square key rc-32-48 | 5 |
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| Century | FL | Machine Key (Square & Rectangular) | Plain | 3/8 x 2 1/2 | #28-112 3/8 x 2-1/2in bail pin single wire (square) | 1130 |
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| Jackson | MS | Machine Key (Square & Rectangular) | Steel | Plain | 3/8 x 5/8 x 12 | key machine rectangle | 6 |
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| Jackson | MS | Machine Key (Square & Rectangular) | Steel | Plain | 3/8 x 1/2 x 12 | key machine rectangle | 20 |
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| Endries | WI | Machine Key (Square & Rectangular) | Plain | 3/8 x 1 1/4 | 3/8x1-1/4 square machine key undersized plain | 716 |
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| Endries | WI | Machine Key (Square & Rectangular) | Steel | Plain | 3/8 x 1 5/8 | 3/8x1-5/8 square machine key undersized plain | 340 |
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| Endries | WI | Machine Key (Square & Rectangular) | Plain | 3/8 x 4 1/2 | 3/8x4-1/2 square machine key undersized plain | 202 |
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| Endries | WI | Machine Key (Square & Rectangular) | Plain | 3/8 x 1 1/2 | 3/8x1-1/2 1045 square machine key plain undersized | 100 |
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| Endries | WI | Machine Key (Square & Rectangular) | Steel | Plain | 3/8 x 1 9/16 | 3/8x1-9/16 1018 steel square machine key undersized plain | 425 |
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| Endries | WI | Machine Key (Square & Rectangular) | Steel | Plain | 3/8 x 9 5/8 | 3/8x9-5/8 square key +.001-.000 | 20 |
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| Endries | WI | Machine Key (Square & Rectangular) | Steel | Plain | 3/8 x 15 .001 | 3/8x15 square key +.001-.000 | 26 |
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| Endries | WI | Machine Key (Square & Rectangular) | 300 Stainless (A1,A2, 18-8,304,310 etc.) | Plain | 3/8 x 1 5/16 | 3/8x1-5/16 18-8 s/s steel square machine key | 25 |
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| Endries | WI | Machine Key (Square & Rectangular) | Steel | Plain | 3/8 x 10 | 3/8x10 square machine key oversized +.001/-.000 plain | 25 |
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| Endries | WI | Machine Key (Square & Rectangular) | Steel | Plain | 3/8 x 2 5/8 | 3/8x2-5/8 square machine key undersized plain | 368 |
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| Endries | WI | Machine Key (Square & Rectangular) | Steel | Plain | 3/8 x 11 1/2 | 3/8x11-1/2 square key +.001-.000 | 196 |
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| Endries | WI | Machine Key (Square & Rectangular) | Steel | Plain | 3/8 x 12 .001 | 3/8x12 square key +.001-.000 | 54 |
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| Endries | WI | Machine Key (Square & Rectangular) | Steel | Plain | 3/8 x 6.1875 | 3/8x6.1875 1018/1020 steel square machine key undersized plain | 184 |
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| Endries | WI | Machine Key (Square & Rectangular) | Steel | Plain | 3/8 x 1 1/8 | 3/8x1-1/8 square machine key undersized plain | 661 |
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| Endries | WI | Machine Key (Square & Rectangular) | Steel | Plain | 3/8x4 square machine key undersized plain | | 276 |
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| Endries | WI | Machine Key (Square & Rectangular) | Steel | Plain | 3/8x3 square machine key undersized plain | | 362 |
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| Endries | WI | Machine Key (Square & Rectangular) | Steel | Plain | 3/8 x 24.15 | 3/8x24.15 square machine key undersized plain | 2 |
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| SWACO | OH | Machine Key (Square & Rectangular) | Steel | Plain | 3/8 x 3/8 x 2 | 3/8x3/8x2 cut key | 18 |
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| NAPPCO | TX | Machine Key (Square & Rectangular) | Steel | Zinc/Clear | 3/8 x 3/8 x 36 | 3/8 x 3/8 x 36 square key zp rohs | 8 |
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| Endries | WI | Machine Key (Square & Rectangular) | Steel | Plain | 3/8 x 2 | 3/8x2 square machine key undersized plain | 900 |
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| NutsBolts | NE | Machine Key (Square & Rectangular) | Steel | Plain | 3/8 | 3/8 square snap wire pin | 76 |
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| Liberty | IL | Machine Key (Square & Rectangular) | Steel | Plain | 3/8 x 2 | square key | 70 |
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| Liberty | IL | Machine Key (Square & Rectangular) | Steel | Plain | 3/8 x 7/8 | square key | 500 |
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| Liberty | IL | Machine Key (Square & Rectangular) | Steel | Zinc/Clear | 3/8 x 12 | square key | 18 |
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| Endries | WI | Machine Key (Square & Rectangular) | Steel | Plain | 3/8 x 1 1/8 | 3/8x1-1/8 square machine key undersized plain | 661 |
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| Endries | WI | Machine Key (Square & Rectangular) | Steel | Plain | 3/8 x 11 .001 | 3/8x11 square key +.001-.000 | 40 |
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| Field Fas | IL | Machine Key (Square & Rectangular) | Steel | Plain | 3/8 x 1 | 3/8 x 1 square key oversized stl pln | 494 |
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| Field Fas | IL | Machine Key (Square & Rectangular) | Steel | Plain | 3/8 x 2 | 3/8 x 2 square key oversized round ends alloy stl rc40-50 heat treat pln | 300 |
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| Field Fas | IL | Machine Key (Square & Rectangular) | Steel | Plain | 3/8 x 1 7/8 | 3/8 x 1 7/8 square key oversize alloy rc40-50 round ends stl pln | 900 |
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| Field Fas | IL | Machine Key (Square & Rectangular) | Steel | Plain | 3/8 x 2 1/8 | 3/8 x 2 1/8 square key oversize stl pln_x000d_a/f .375-.376 | 250 |
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| Field Fas | IL | Machine Key (Square & Rectangular) | 300 Stainless (A1,A2, 18-8,304,310 etc.) | Plain | 3/8 x 1 1/8 | 3/8 x 1 1/8 square key undersize rd ends 18-8 ss a/f .373/.375 | 984 |
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| Irwin Ind | Ont | Machine Key (Square & Rectangular) | 300 Stainless (A1,A2, 18-8,304,310 etc.) | Plain | 3/8 x 3/8 x 1.000 | 3/8 x 3/8 x 1.000 machine key undersize stainless steel | 16 |
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| Endries | WI | Machine Key (Square & Rectangular) | Steel | Plain | 3/8 x 1 3/4 | 3/8x1-3/4 1045 square machine key undersized | 689 |
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| Endries | WI | Machine Key (Square & Rectangular) | Steel | Plain | 3/8 x 5/16 x 3 | 3/8x5/16x3in undersized rectangular machine key plain | 130 |
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| Endries | WI | Machine Key (Square & Rectangular) | Steel | Plain | 3/8 x 1 1/2 | 3/8x1-1/2 square machine key undersized plain | 259 |
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| Wurth Ind | IN | Machine Key (Square & Rectangular) | Steel | Plain | 3/8 x 3/8 x 2 1/4 | key mach b us 1018 pl 3/8x3/8x2 1/4 steel plain | 2107 |
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| Wurth Ind | IN | Machine Key (Square & Rectangular) | Steel | Plain | 3/8 x 3/8 x 3 | key mach b us 1018 pl 3/8x3/8x3 steel plain | 340 |
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| WINA | MN | Machine Key (Square & Rectangular) | Aluminum | Plain | 3/8 x 3/8 x 2 1/4 | key mach b us 1018 pl 3/8x3/8x2 1/4 | 2107 |
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| WINA | MN | Machine Key (Square & Rectangular) | Aluminum | Plain | 3/8 x 3/8 x 3 | key mach b us 1018 pl 3/8x3/8x3 | 340 |
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| Endries | WI | Machine Key (Square & Rectangular) | Steel | Plain | 3/8 x 1 3/4 | 3/8x1-3/4 square machine key undersized plain | 1000 |
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| Mansco | MI | Machine Key (Square & Rectangular) | 300 Stainless (A1,A2, 18-8,304,310 etc.) | Plain | 3/8 x 3/8 x 12 | 3/8x3/8x12 square key 18-8 s/s 1/box | 4 |
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| Mansco | MI | Machine Key (Square & Rectangular) | 300 Stainless (A1,A2, 18-8,304,310 etc.) | Plain | 3/8 x 3/8 x 1 1/4 | square key 18-8 s/s | 124 |
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| Field Fas | IL | Machine Key (Square & Rectangular) | Steel | Plain | 3/8 x 7 1/2 | 3/8x7 1/2 square key oversized stl pln | 564 |
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| Field Fas | IL | Machine Key (Square & Rectangular) | Steel | Plain | 3/8 x 1 5/8 | 3/8x1 5/8 square key undersize 1045 alloy stl pln | 212 |
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| MidStates | MI | Machine Key (Square & Rectangular) | Steel | Plain | 3/8 x 1/4 | machinery key-both ends rnd 1- | 92 |
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| WDMB | IA | Machine Key (Square & Rectangular) | Steel | Zinc/Clear | 3/8 x 2 1/4 | pin snap square 2wire steel (zt) 3/8x2 1/4el (W030) (W030) (W030) | 507 |
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| WDMB | IA | Machine Key (Square & Rectangular) | Steel | Plain | 3/8 x 3/8 x 2 | key mach us sq b 3/8x3/8x2 (W040) | 651 |
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| WDMB | IA | Machine Key (Square & Rectangular) | Steel | Plain | 3/8 x 3.88 | gib key steel (pl) 3/8(+.001)x3.88 (W0M0) | 59 |
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| WDMB | IA | Machine Key (Square & Rectangular) | Steel | Plain | 3/8 x 1.30 | key square rd/end hrd st 3/8x1.30l drw | 100 |
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| WDMB | IA | Machine Key (Square & Rectangular) | Steel | Plain | 3/8 x 1 7/8 | key mch sq a rc40 undr st 3/8x1 7/8 drw (W010) (W010) | 742 |
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| WDMB | IA | Machine Key (Square & Rectangular) | 300 Stainless (A1,A2, 18-8,304,310 etc.) | Plain | 3/8 x 3 1/2 | key mach sqr b under (18 8) 3/8x3 1/2 (W020) (W020) | 447 |
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| ISSCO | MO | Machine Key (Square & Rectangular) | Grade 2 | Plain | 3/8 x 3/8 x 1 | square +.001/.000 | 1040 |
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| ISSCO | MO | Machine Key (Square & Rectangular) | Grade 2 | Plain | 3/8 x 3/8 x 2 1/2 | square +.001/.000 | 375 |
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| ISSCO | MO | Machine Key (Square & Rectangular) | Grade 2 | Plain | 3/8 x 3/8 x 1 1/2 | square +.001/.000 | 4630 |
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| ISSCO | MO | Machine Key (Square & Rectangular) | Steel | Plain | 3/8 x 1 1/2 | gib head key 5/16 taper | 1216 |
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| ISSCO | MO | Machine Key (Square & Rectangular) | Steel | Plain | 3/8 x 3 1/2 | gib head key 5/16 taper | 250 |
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| ISSCO | MO | Machine Key (Square & Rectangular) | Steel | Plain | 3/8 x 2 1/4 | gib head key 5/16 taper | 525 |
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| WSB | KY | Machine Key (Square & Rectangular) | 300 Stainless (A1,A2, 18-8,304,310 etc.) | Plain | 3/8 x 3 1/2 | key mach sqr b under (18-8) 3/8x3 1/2 | 624 |
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| Revcar | VA | Machine Key (Square & Rectangular) | Steel | Plain | 3/8 x 1 5/8 | sq key sq ends | 550 |
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| Wurth | IN | Machine Key (Square & Rectangular) | Stee l | Plain | 3/8 x 1 1/4 | 3/8 x 1-1/4 square key class 2 c1018 w/ chamfered ends per print 8212 rev 06 | 422 |
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