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15-40 In Oz / 1/4" Hex Tohnichi Rotary Slip and Adjustable Torque Driver - RTD40Z

1/4" Hex 15 - 40 In Oz Tohnichi Slip Type Adjustable Torque Driver - RTD40Z

$149.15 $157.00
(You save $7.85)
Model #
Drive Size:
1/4" Female Hex
English Range:
15 - 40 In Oz
0.05 Kg
± 3%
In Oz


The Tohnichi Torque Screwdriver RTD40Z has a 1/4" Hex drive and an English range of 15 - 40 In Oz.

Used for any tightening operation such as mass production assembly and maintenance. The rotary slip clutch reduces the possibility of over-torque. Once torque set is achieved, even if more force is applied, the tool ratchets and does not add additional torque. 


  • Adjustable torque setting by twisting shaft with main and supplementary scales
  • Models are available in SI, Metric or English units of measure --one unit of measure on tool
  • Lock ring holds selected torque value in place
  • For Clockwise tightening only
  • Click alerts user that torque set has been achieved
  • Rotary slip mechanism prevents over torque by ratcheting after click
  • Accuracy +/-3% of indicated value
  • Mid range models have removable colored resin grip
  • Large models includes hook to assist with turning shaft to set tool for higher values.
  • Accepts 1/4 hex bits (not included) See Accessories tab above
  • Includes Tohnichi Factory Certificate of Calibration
  • (NIST Traceable Certificate of Calibration offered for additional fee)
MODEL TORQUE RANGE Dimensions [mm] Weight Approx. Accessories
Overall Length Grip Body
New Model Name min.-max. Graduation L' D1 D2 D3 D4 L1 L2 kg Removable Resin Grip Handle Bar Hook Spanner
RTD40Z in·Oz
100 16 10.7 11 21.5 18 76.5-84.3 0.05 N/A - -


  • This series accepts standard 6.35 (1/4) hex bits, sold separately.


 Made In Japan

Warranty Information

All Tohnichi products are thoroughly checked and tested at the factory before shipment. The accuracy of each tool should be as stated for each model as a percentage of reading unless otherwise noted. Hand tool durability is based on repeated movement tests over a minimum of 100, 000 cycles by a durability testing machine. Should defects due to faulty materials and workmanship develop within one (1) year from the date of sale, it will be repaired and put in workable condition or replaced free of charge if returned to Tohnichi with proof of purchase. The warranty is not valid if the product has been misused, tampered with, or abused.