Tekton TRQ50402 - 1/4 in. Micrometer Torque Wrench

The Tekton TRQ50402 is a 1/4 inch drive dual-direction micrometer torque wrench rated 20–200 in-lb and calibrated to the rigorous ISO 6789 standard. Unlike the more commonly referenced ASME B107.300, ISO requires testing across the full stated range—not just above 20%—and mandates five readings per set point in both clockwise and counterclockwise directions. Every TRQ50402 ships with a serialized certificate of calibration documenting the exact accuracy of that specific wrench.

For aviation maintenance technicians, A&P mechanics, avionics shops, and MRO facilities, the TRQ50402 covers the small-fastener torque range demanded by AMM procedures across avionics bays, instrument panels, ATA 23/24/31/34 assemblies, and AN hardware. It is the 1/4 inch micrometer torque wrench built to tolerate daily MRO use while maintaining documented, traceable accuracy.

Key Features

• ISO 6789 Full-Range Calibration — Tested 20–200 in-lb in both directions; meets and exceeds ASME requirements
• ±3% Accuracy CW & CCW — Actual measured accuracy printed on the serialized calibration certificate
• 90-Tooth Ratchet Head — Single half-moon pawl engages 9 teeth simultaneously; 4° swing arc minimizes handle travel in confined spaces
• Dual-Direction Click Mechanism — Positive audible and tactile click confirmation in both directions
• Locking Collar — Springs to locked position; prevents accidental setting drift between fasteners
• Laser-Etched Micrometer Scale — High-contrast bold fonts on satin-finished body; no glare, no guessing
• Coarse Diamond-Knurl Grip — Centerline groove keeps hand positioned at the calibrated pivot point
• HDPE Carrying Case — Custom-fit case protects the wrench and certificate during transport and storage
• Lifetime Warranty — No receipts, no time limits; Tekton makes it right

Specifications

• Drive Size: 1/4 in.
• Torque Range: 20–200 in-lb
• Calibration Standard: ISO 6789
• Accuracy: ±3% clockwise and counterclockwise
• Ratchet Teeth: 90
• Swing Arc: 4° per tooth
• Mechanism: Micrometer click-type
• Scale Units: in-lb (single-unit scale)
• Handle Finish: Satin
• Case Material: HDPE (latches: polypropylene)
• Certificate: Serialized, included
• Replaces: TRQ21101

ISO 17025 Calibration Available at PJi

Pilot John International is an ISO 17025-accredited calibration laboratory. When your TRQ50402 requires recertification for your tool control program, PJi issues a NIST-traceable calibration certificate acceptable for FAA Part 145 repair station records, Part 91/135 operator maintenance programs, and ISO 9001 QMS documentation. Schedule recalibration intervals to match your tool audit cycle — one distributor, one calibration lab, complete chain of custody.