Tekton TRQ95901 - 3-Piece Micrometer Torque Wrench Set

A functional aviation torque program does not run on one wrench. The technician torquing avionics panel hardware at 35 in-lb and the mechanic torquing wheel assembly bolts at 150 ft-lb are working at opposite ends of the torque spectrum — and a single micrometer wrench cannot serve both applications correctly. A 1/2 inch drive wrench operated at 35 in-lb is below the ISO 6789 calibration floor of its rated range, outside its meaningful accuracy band, and the wrong tool for the procedure. The right instrument for a torque specification is a wrench whose rated range brackets that value. A shop doing the full scope of aircraft maintenance needs all three drive sizes. The Tekton TRQ95901 is that program in a single purchase decision.

The set contains the TRQ50402 (1/4 in. drive, 20–200 in-lb), TRQ51402 (3/8 in. drive, 10–100 ft-lb), and TRQ52402 (1/2 in. drive, 40–200 ft-lb) — each in its own individual HDPE case with its own serialized certificate of calibration. Every wrench is ISO 6789-calibrated to ±3% clockwise and counterclockwise, tested from the lowest marked value to maximum, five readings per set point in both directions. At $290 versus $320 purchased individually, the set saves $30 — but the more meaningful argument is the program architecture: one SKU, one shipment, three calibration programs starting on the same date from the same ISO 17025-accredited distributor that can recertify all three at a single scheduled service event.

Pilot John International's ISO 17025-accredited calibration laboratory recertifies all three wrenches on the same interval, issuing three NIST-traceable certificates on the same date. The tool control log never has staggered expiry dates pulling the program out of compliance one wrench at a time. For FAA Part 145 repair stations, Part 91/135 operators, and ISO 9001 / AS9100 quality programs, synchronized calibration across the full set is the correct program design. PJi is the only distributor selling this set that can also calibrate it.

Set Contents and Aviation Applications

• TRQ50402 — 1/4 in. Drive, 20–200 in-lb — Avionics panel hardware, instrument bay fasteners, pitot-static system fittings, small AN hardware, ATA 23/24/31/34 component torque sequences; the correct wrench for any specification under 200 in-lb where a 3/8 inch drive wrench operating below its calibrated floor would be the wrong tool
• TRQ51402 — 3/8 in. Drive, 10–100 ft-lb — Engine mount hardware, propeller flange fasteners, landing gear leg bolts, accessory gearbox drive components, exhaust system fasteners, and the mid-range structural and powerplant work that constitutes the majority of documented line maintenance torque specifications
• TRQ52402 — 1/2 in. Drive, 40–200 ft-lb — Wheel and brake assembly hardware, engine mount primary attachment bolts, propeller hub retention on standard-torque installations, and landing gear trunnion and axle fasteners within the 200 ft-lb ceiling; for applications requiring torque above 200 ft-lb, see the TRQ52403 individually or the TRQ95902 set

Shared Specifications — All Three Wrenches

• ISO 6789 Full-Range Calibration — Tested from lowest marked value to maximum in both directions; five readings per set point; meets and exceeds ASME B107.300 at every requirement
• ±3% Accuracy CW & CCW — Actual measured accuracy of each individual wrench documented on its own serialized certificate — not a set average
• 90-Tooth Fixed Ratchet Head — Single half-moon pawl holds 9 teeth engaged simultaneously; 4° swing arc; consistent click feedback across the working range
• Dual-Direction Click Mechanism — Positive audible and tactile confirmation in both clockwise and counterclockwise directions
• Locking Collar — Auto-springs to locked position; prevents accidental torque setting changes between fasteners
• Laser-Etched Micrometer Scale — Satin finish, high-contrast bold fonts, straight centered indicator lines; readable without rotating the wrench
• Coarse Diamond-Knurl Grip — Deep-cut centerline groove positions hand at the calibrated pivot point on all three handle lengths
• Individual HDPE Case Per Wrench — Three separate cases; each wrench and its certificate stored and transported independently
• Store at Minimum Setting — Wind each wrench back to its lowest marked value after every use to relieve spring tension and prevent calibration drift; applies to all three micrometer instruments
• Lifetime Warranty — No receipts, no time limits; Tekton makes it right on each individual wrench

Coverage Ceiling Note — Choosing the Right Set

The TRQ95901 includes the TRQ52402 (40–200 ft-lb) as the 1/2 inch drive wrench. Applications requiring torque values above 200 ft-lb — turboprop primary engine mount hardware, heavy landing gear trunnion bolts, or structural fasteners specified above this value — require the TRQ52403 (40–300 ft-lb). That wrench is available individually or as part of the TRQ95902 set, which uses the same 1/4 inch and 3/8 inch drive wrenches but replaces the TRQ52402 with the TRQ52403 in the same three-piece format. If your shop's torque program includes any application above 200 ft-lb, TRQ95902 is the correct set choice.

ISO 17025 Calibration at PJi — One Service Event for the Complete Program

Pilot John International is an ISO 17025-accredited calibration laboratory. PJi recertifies all three wrenches in the TRQ95901 set on the same scheduled interval, issuing three individual NIST-traceable calibration certificates with full test documentation on the same service date. Synchronized calibration means the tool control log maintains a consistent expiry date across the entire micrometer wrench program — no staggered intervals, no single-wrench compliance gaps. That documentation package is accepted by FAA Part 145 repair stations, Part 91/135 operators, EASA Part 145 maintenance organizations, and AS9100 / ISO 9001 quality programs. PJi is the only distributor selling this set that can recertify every wrench in it to an internationally accredited laboratory standard.