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1/4" Dr 50 - 450 cNm Williams Micro Adjustable Torque Screwdriver - 401NSMW

1/4" Dr 50 - 450 cNm Williams Micro Adjustable Torque Screwdriver - 401NSMW

$183.84 $383.00
(You save $199.16)
Model #
Drive Size:
1/4 Inch Female Hex
Metric Range:
50-450 cNm
10.8 Oz
± 6%



The Williams 401NSMW Micro Adjustable Torque Screwdriver has a 1/4" Female Hex Drive and Metric range of 50-450 cNm.  Adjustable models offer versatility for applications that require more than one torque value. These torque screwdrivers are particularly suited for the electronics industry and for instrument assembly work.

A simple, cam-over design prevents over-tightening and possible damage to components. Torque settings are easily and accurately changed with a unique adjusting knob and easy-to-read window scale. Adjusting the screwdriver is simple. Just pull out the adjusting knob to unlock, turn to the desired setting, then push the knob in until it clicks! Positive locking knob makes accidental setting changes impossible. Automatic locking in counterclockwise direction makes fastener removal a snap for the Williams 401NSMW adjustable torque screwdriver.


  • Positive locking pull down adjustment knob
  • Trilobular comfort grip
  • Universal 1/4” hex bit holder with strong rare earth magnet
  • Cam-over torque limiting clutch
  • Slip resistant finish
  • Easy-to-read window scale
  • Light weight
  • Automatic lock in CCW direction for disassembly
  • Accuracy: ± 6% of indicated value, CW, from 20% to 100% of full scale
  • Individually serialized with matching certificate of calibration traceable to N.I.S.T.
  • Meets or exceeds ASME B107.14 - 2004
  • Torque Range: 50 - 450 cNm
  • Increments: 5 cNm
  • W x L Inches: 1.2 x 6.75
  • Wt. Oz.: 10.8