Products > Power Transmission Hardware > Machine Keys > Undersize Machine Keys

Undersize Machine Keys

Undersize machine keys are cut from key stock to lengths under 12 inches long. Undersize indicates that the key is either at or slightly smaller than a specified size while remaining within the tolerance range. Just as with other machine keys, undersize machine keys hold machinery parts in place or align components and normally fit without the need to file. They are specifically designed to fail as a safety mechanism to save more expensive components. Standard sizes are ready to use without any cutting or filing.

  • Available in Carbon Steel, and Stainless Steel
  • Offered in corrosion resistant Zinc Clear finish
  • Undersize machine keys are relatively free fitting
  • Visit our Product FAQs to learn more about Key Stock & Machine Keys
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Undersize Machine Keys

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  • 1" x 1"
  • 1" x 1-1/2"
  • 1" x 1-1/4"
  • 1" x 1-1/8"
  • 1" x 1-3/4"
  • 1" x 2"
  • 1-1/16" x 1-1/4"
  • 1-1/2" x 1-1/2"
  • 1-1/2" x 1-3/4"
  • 1-1/2" x 2"
  • 1-1/4" x 1-1/2"
  • 1-1/4" x 1-1/4"
  • 1-1/4" x 1-3/4"
  • 1-1/4" x 1/8"
  • 1-1/4" x 2"
  • 1-1/8" x 1-1/2"
  • 1-1/8" x 1-1/4"
  • 1-1/8" x 1-1/8"
  • 1-3/16" x 1-1/4"
  • 1-3/4" x 1-3/4"
  • 1-3/4" x 2-1/2"
  • 1-3/8" x 1-3/8"
  • 1-5/8" x 1-5/8"
  • 1-7/8" x 1-7/8"
  • 1-7/8" x 2-1/4"
  • 1/16" x 1/16"
  • 1/2" x 1"
  • 1/2" x 1-1/2"
  • 1/2" x 1-1/4"
  • 1/2" x 1/2"
  • 1/2" x 3/4"
  • 1/2" x 5/8"
  • 1/2" x 7/8"
  • 1/2" x 9/16"
  • 1/4" x 1"
  • 1/4" x 1-1/2"
  • 1/4" x 1-1/4"
  • 1/4" x 1/2"
  • 1/4" x 1/4"
  • 1/4" x 3/4"
  • 1/4" x 3/8"
  • 1/4" x 5/16"
  • 1/4" x 5/8"
  • 1/4" x 7/16"
  • 1/4" x 7/8"
  • 1/8" x 1"
  • 1/8" x 1-1/2"
  • 1/8" x 1/2"
  • 1/8" x 1/4"
  • 1/8" x 1/8"
  • 1/8" x 3/16"
  • 1/8" x 3/8"
  • 1/8" x 5/32"
  • 11/16" x 1"
  • 11/16" x 11/16"
  • 11/16" x 3/4"
  • 11/16" x 7/8"
  • 13/16" x 13/16"
  • 13/32" x 3/4"
  • 15/16" x 15/16"
  • 17/32" x 5/8"
  • 19/32" x 5/8"
  • 2" x 2"
  • 2" x 3"
  • 2-1/4" x 2-1/4"
  • 3/16" x 1/2"
  • 3/16" x 1/4"
  • 3/16" x 3/16"
  • 3/16" x 3/4"
  • 3/16" x 3/8"
  • 3/16" x 5/16"
  • 3/16" x 5/8"
  • 3/32" x 1/8"
  • 3/32" x 3/16"
  • 3/32" x 3/32"
  • 3/4" x 1"
  • 3/4" x 1-1/2"
  • 3/4" x 1-1/4"
  • 3/4" x 1-1/8"
  • 3/4" x 1-3/4"
  • 3/4" x 2"
  • 3/4" x 3/4"
  • 3/4" x 7/8"
  • 3/8" x 1"
  • 3/8" x 1/2"
  • 3/8" x 27/64"
  • 3/8" x 3/4"
  • 3/8" x 3/8"
  • 3/8" x 5/8"
  • 3/8" x 7/16"
  • 3/8" x 7/8"
  • 5/16" x 1/2"
  • 5/16" x 25/64"
  • 5/16" x 3/4"
  • 5/16" x 3/8"
  • 5/16" x 5/16"
  • 5/16" x 5/8"
  • 5/16" x 7/16"
  • 5/32" x 3/16"
  • 5/32" x 5/16"
  • 5/32" x 5/32"
  • 5/8" x 1"
  • 5/8" x 1-1/4"
  • 5/8" x 3/4"
  • 5/8" x 5/8"
  • 5/8" x 7/8"
  • 7/16" x 1/2"
  • 7/16" x 3/4"
  • 7/16" x 5/8"
  • 7/16" x 7/16"
  • 7/32" x 1/2"
  • 7/32" x 1/4"
  • 7/32" x 3/8"
  • 7/32" x 5/16"
  • 7/32" x 5/8"
  • 7/32" x 7/32"
  • 7/8" x 1"
  • 7/8" x 1-1/2"
  • 7/8" x 1-1/4"
  • 7/8" x 7/8"
  • 9/16" x 3/4"
  • 9/16" x 5/8"
  • 9/16" x 7/8"
  • 9/16" x 9/16"
  • 9/32" x 5/16"
  • M10 x 10
  • M10 x 6
  • M10 x 7
  • M10 x 8
  • M11 x 11
  • M12 x 10
  • M12 x 12
  • M12 x 6
  • M12 x 7
  • M12 x 8
  • M12 x 9
  • M13 x 10
  • M13 x 11
  • M14 x 10
  • M14 x 14
  • M14 x 6
  • M14 x 8
  • M14 x 9
  • M15 x 10
  • M15 x 12
  • M15 x 8
  • M16 x 10
  • M16 x 11
  • M16 x 12
  • M16 x 16
  • M16 x 7
  • M16 x 8
  • M16 x 9
  • M18 x 11
  • M18 x 12
  • M18 x 14
  • M18 x 18
  • M18 x 7
  • M18 x 9
  • M19 x 19
  • M2 x 2
  • M20 x 12
  • M20 x 13
  • M20 x 14
  • M20 x 15
  • M20 x 16
  • M20 x 20
  • M20 x 8
  • M22 x 14
  • M22 x 20
  • M22 x 22
  • M22 x 9
  • M24 x 14
  • M24 x 16
  • M25 x 14
  • M25 x 25
  • M25 x 9
  • M26 x 26
  • M28 x 10
  • M28 x 16
  • M28 x 25
  • M28 x 28
  • M3 x 3
  • M30 x 20
  • M32 x 18
  • M36 x 20
  • M4 x 3
  • M4 x 4
  • M40 x 10
  • M40 x 20
  • M40 x 22
  • M45 x 25
  • M5 x 3
  • M5 x 4
  • M5 x 5
  • M50 x 25
  • M50 x 28
  • M6 x 4
  • M6 x 5
  • M6 x 6
  • M7 x 7
  • M8 x 5
  • M8 x 6
  • M8 x 7
  • M8 x 8
  • M9 x 4
  • M9 x 6
  • M9 x 8
  • M9 x 9
  • 1-13/16"
  • 1-5/16"
  • 1-7/16"
  • 1/2"
  • 15/16"
  • 2-13/16"
  • 2-5/16"
  • 3-13/16"
  • 3-5/16"
  • 4-3/4"
  • 5-3/4"
  • 5/8"
  • 6-3/4"
  • 7-3/4"
  • 9/16"
  • .0625" (1/16)
  • .0937" (3/32)
  • .1250" (1/8)
  • .1562" (5/32)
  • .1875" (3/16)
  • .2187" (7/32)
  • .2360"
  • .2500" (1/4)
  • .2812" (9/32)
  • .3020"
  • .3080"
  • .3125" (5/16)
  • .3200"
  • .3750" (3/8)
  • .4062" (13/32)
  • .4375" (7/16)
  • .4710"
  • .5000" (1/2)
  • .5300"
  • .5625" (9/16)
  • .5937" (19/32)
  • .6250" (5/8)
  • .6875" (11/16)
  • .7500" (3/4)
  • .8125" (13/16)
  • .8750" (7/8)
  • .9375" (15/16)
  • 1.0000" (1)
  • 1.0625" (1-1/16)
  • 1.1250" (1-1/8)
  • 1.1875" (1-3/16)
  • 1.2500" (1-1/4)
  • 1.3750" (1-3/8)
  • 1.5000" (1-1/2)
  • 1.6250" (1-5/8)
  • 1.7500" (1-3/4)
  • 1.8750" (1-7/8)
  • 2.0000" (2)
  • 2.2500" (2-1/4)
  • 3.1750"
  • M10.000
  • M11.000
  • M12.000
  • M13.000
  • M14.000
  • M15.000
  • M16.000
  • M18.000
  • M19.000
  • M2.000
  • M20.000
  • M22.000
  • M24.000
  • M25.000
  • M26.000
  • M28.000
  • M3.000
  • M30.000
  • M32.000
  • M36.000
  • M4.000
  • M40.000
  • M45.000
  • M5.000
  • M50.000
  • M6.000
  • M7.000
  • M8.000
  • M9.000
  • .1880"
  • .2190"
  • .2500" (1/4)
  • .2600"
  • .3000"
  • .3130"
  • .3200"
  • .3250"
  • .3400"
  • .3440"
  • .3600"
  • .3750" (3/8)
  • .3800"
  • .3900"
  • .4000"
  • .4060"
  • .4100"
  • .4220"
  • .4330"
  • .4380"
  • .4500"
  • .4550"
  • .4690"
  • .4700"
  • .5000" (1/2)
  • .5100"
  • .5200"
  • .5310"
  • .5500"
  • .5510"
  • .5600"
  • .5630"
  • .5750"
  • .5850"
  • .5900"
  • .5940"
  • .5950"
  • .6000"
  • .6100"
  • .6160"
  • .6250" (5/8)
  • .6300"
  • .6400"
  • .6450"
  • .6500"
  • .6550"
  • .6600"
  • .6730"
  • .6750"
  • .6800"
  • .6850"
  • .6880"
  • .6900"
  • .6960"
  • .7000"
  • .7030"
  • .7080"
  • .7190"
  • .7200"
  • .7400"
  • .7500" (3/4)
  • .7660"
  • .7810"
  • .7870"
  • .8000"
  • .8010"
  • .8050"
  • .8130"
  • .8150"
  • .8200"
  • .8250"
  • .8270"
  • .8400"
  • .8440"
  • .8500"
  • .8600"
  • .8700"
  • .8750" (7/8)
  • .8800"
  • .9000"
  • .9060"
  • .9100"
  • .9300"
  • .9380"
  • .9400"
  • .9500"
  • .9530"
  • .9620"
  • .9690"
  • .9800"
  • .9840"
  • .9850"
  • .9860"
  • 1.0000" (1)
  • 1.0230"
  • 1.0600"
  • 1.0630"
  • 1.0750"
  • 1.0800"
  • 1.0850"
  • 1.0940"
  • 1.1000"
  • 1.1090"
  • 1.1180"
  • 1.1200"
  • 1.1250" (1-1/8)
  • 1.1300"
  • 1.1400"
  • 1.1600"
  • 1.1720"
  • 1.1800"
  • 1.1810"
  • 1.1850"
  • 1.1880"
  • 1.2000"
  • 1.2190"
  • 1.2200"
  • 1.2240"
  • 1.2500" (1-1/4)
  • 1.2810"
  • 1.2970"
  • 1.3100"
  • 1.3130"
  • 1.3200"
  • 1.3250"
  • 1.3280"
  • 1.3300"
  • 1.3380"
  • 1.3440"
  • 1.3500"
  • 1.3750" (1-3/8)
  • 1.3770"
  • 1.3800"
  • 1.3900"
  • 1.4000"
  • 1.4050"
  • 1.4060"
  • 1.4150"
  • 1.4200"
  • 1.4220"
  • 1.4240"
  • 1.4300"
  • 1.4380"
  • 1.4500"
  • 1.4530"
  • 1.4570"
  • 1.4600"
  • 1.4690"
  • 1.4700"
  • 1.4750"
  • 1.4860"
  • 1.5000" (1-1/2)
  • 1.5300"
  • 1.5310"
  • 1.5600"
  • 1.5630"
  • 1.5700"
  • 1.5750"
  • 1.5800"
  • 1.5940"
  • 1.5960"
  • 1.6000"
  • 1.6250" (1-5/8)
  • 1.6500"
  • 1.6870"
  • 1.6880"
  • 1.6900"
  • 1.7000"
  • 1.7030"
  • 1.7190"
  • 1.7200"
  • 1.7300"
  • 1.7500" (1-3/4)
  • 1.7600"
  • 1.7700"
  • 1.7720"
  • 1.7810"
  • 1.7900"
  • 1.8000"
  • 1.8100"
  • 1.8130"
  • 1.8280"
  • 1.8290"
  • 1.8500"
  • 1.8750" (1-7/8)
  • 1.8800"
  • 1.9000"
  • 1.9060"
  • 1.9100"
  • 1.9375"
  • 1.9380"
  • 1.9400"
  • 1.9500"
  • 1.9530"
  • 1.9690"
  • 1.9850"
  • 10.0000" (10)
  • 10.1200"
  • 10.2000"
  • 10.2500" (10-1/4)
  • 10.3000"
  • 10.3700"
  • 10.4000"
  • 10.5000" (10-1/2)
  • 10.6000"
  • 10.7000"
  • 11.0000" (11)
  • 11.3000"
  • 11.3700"
  • 11.5000" (11-1/2)
  • 11.7000"
  • 11.7500" (11-3/4)
  • 11.8000"
  • 2.0000" (2)
  • 2.0310"
  • 2.0630"
  • 2.1250"
  • 2.1300"
  • 2.1500"
  • 2.1560"
  • 2.1650"
  • 2.1700"
  • 2.1880"
  • 2.1970"
  • 2.2100"
  • 2.2200"
  • 2.2500" (2-1/4)
  • 2.2760"
  • 2.2810"
  • 2.3100"
  • 2.3130"
  • 2.3300"
  • 2.3530"
  • 2.3600"
  • 2.3620"
  • 2.3750" (2-3/8)
  • 2.3800"
  • 2.3850"
  • 2.4000"
  • 2.4220"
  • 2.4280"
  • 2.4380"
  • 2.4400"
  • 2.4690"
  • 2.4700"
  • 2.5000" (2-1/2)
  • 2.5500"
  • 2.5600"
  • 2.5630"
  • 2.6000"
  • 2.6250" (2-5/8)
  • 2.6500"
  • 2.6880"
  • 2.7000"
  • 2.7100"
  • 2.7500" (2-3/4)
  • 2.7550"
  • 2.7600"
  • 2.8000"
  • 2.8130"
  • 2.8700"
  • 2.8750" (2-7/8)
  • 2.8800"
  • 2.9000"
  • 2.9380"
  • 2.9400"
  • 2.9500"
  • 2.9850"
  • 3.0000" (3)
  • 3.0300"
  • 3.0600"
  • 3.0620"
  • 3.0630"
  • 3.0900"
  • 3.0940"
  • 3.1200"
  • 3.1250" (3-1/8)
  • 3.1300"
  • 3.1470"
  • 3.1500"
  • 3.1560"
  • 3.1880"
  • 3.2190"
  • 3.2300"
  • 3.2500" (3-1/4)
  • 3.3000"
  • 3.3100"
  • 3.3130"
  • 3.3750" (3-3/8)
  • 3.4250"
  • 3.4370"
  • 3.4380"
  • 3.4690"
  • 3.4840"
  • 3.5000" (3-1/2)
  • 3.5300"
  • 3.5630"
  • 3.6000"
  • 3.6250" (3-5/8)
  • 3.6500"
  • Rectangle
  • Square
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