Wright Tool 4478 Micro-Adjustable Torque Wrench, 50 - 250 Foot Pounds

Wright Tool 4478 Micro-Adjustable Torque Wrench, 50 - 250 Foot Pounds

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1/2 Drive Ratchet Head 50-250 FT-LBS Micro-Adjustable Torque Wrench 4478

The Wright Tool 4478 1/2" Drive Torque wrench is a micro-adjustable "click type" metal handle torque wrench. Made to use with hand sockets. It is accurate; ± 4% clockwise; ± 6% counterclockwise @ 20% of the scale. It is easy to operate; rugged; and durable.


  • Patented Wright Drive distributes contact over a larger surface area for greater gripping power and strength.
  • Forged and Machined for Best Fit and Unyielding Strength.
  • Precision heat-treated and tempered for optimal hardness; ductility and durability.
  • Push button socket “quick release” mechanism.
  • English scales primary and metric secondary.
  • Distinct breaking action when the set torque is reached.
  • Breaking action and clicking noise is greatest at the upper part of the scale.
  • Comes in fitted blow mold plastic storage box.
  • Includes a Certificate of Calibration.
  • Made in the USA. Designed; engineered and manufactured in Barberton; OH.
  • Meets and exceeds ASME B107 hand tool standards.


Drive Size 1/2"
Length 24.4"
Torque Range 50-250 ft. lb.
Torque Range Metric 47-332 Nm
Type Click
Head Style Ratchet
Increments (ft. lb.) 1
Increments (Nm) 1.5
Material Forged Alloy Steel
Finish Chrome
Head Type Round
Locking Type Ball
Accuracy ±4% Both Ways