Tekton TRQ51402 - 3/8 in. Micrometer Torque Wrench

The Tekton TRQ51402 is a 3/8 inch drive dual-direction micrometer torque wrench rated 10–100 ft-lb and calibrated to the rigorous ISO 6789 standard. This is the torque range that covers the majority of documented fastener work in line maintenance and heavy check environments — engine mount hardware, landing gear bolts, wheel and brake assemblies, propeller flange fasteners, and ATA structural work. Every TRQ51402 ships with a serialized certificate of calibration that documents the specific measured accuracy of that individual wrench, not a production batch average.

ISO 6789 is stricter than the more commonly cited ASME B107.300 standard. It requires testing from the lowest marked value on the scale — starting at 10 ft-lb, not 20% up the range — and mandates five readings per set point in both clockwise and counterclockwise directions, with both directions required to match. For aviation maintenance technicians, A&P mechanics, and MRO shops where torque documentation is a QA requirement, that distinction is not academic. It is the difference between a wrench you can defend in an audit and one you cannot.

Key Features

• ISO 6789 Full-Range Calibration — Tested 10–100 ft-lb in both directions; meets and exceeds ASME B107.300 requirements
• ±3% Accuracy CW & CCW — Actual measured accuracy documented on the individual serialized calibration certificate
• 90-Tooth Fixed Ratchet Head — Single half-moon pawl engages 9 teeth simultaneously; 4° swing arc for tight-space fastener access
• Dual-Direction Click Mechanism — Positive audible and tactile click in both clockwise and counterclockwise directions
• Locking Collar — Springs automatically to locked position; prevents setting drift between fasteners
• Laser-Etched Micrometer Scale — High-contrast bold fonts on satin-finished body; scale lines straight and centered, readable without rotating the wrench
• Coarse Diamond-Knurl Grip — Deep-cut pattern with centerline groove keeps your hand at the calibrated pivot point every time
• HDPE Carrying Case — Custom-fit hard case protects wrench and certificate during transport and storage
• Lifetime Warranty — No receipts, no time limits; Tekton makes it right

Specifications

• Drive Size: 3/8 in.
• Torque Range: 10–100 ft-lb
• Calibration Standard: ISO 6789
• Accuracy: ±3% clockwise and counterclockwise
• Ratchet Teeth: 90
• Swing Arc: 4° per tooth
• Mechanism: Micrometer click-type
• Scale Units: ft-lb (single-unit scale)
• Handle Finish: Satin
• Case Material: HDPE (latches: polypropylene)
• Certificate: Serialized, included
• Warranty: Lifetime

ISO 17025 Calibration Available at PJi

Pilot John International is an ISO 17025-accredited calibration laboratory. When your TRQ51402 is due for recertification, PJi issues a NIST-traceable calibration certificate with full test documentation, acceptable for FAA Part 145 repair station tool control records, Part 91/135 operator maintenance programs, and ISO 9001 / AS9100 quality management system audits. Schedule your recalibration interval to match your tool control cycle — one distributor, one accredited lab, complete traceability for the life of the tool.