Tekton TRQ95902 - 3-Piece Micrometer Torque Wrench Set

The TRQ95901 and TRQ95902 are the same set in every respect except one: the 1/2 inch drive wrench. The TRQ95901 includes the TRQ52402 (40–200 ft-lb). The TRQ95902 includes the TRQ52403 (40–300 ft-lb). The question that decides which set is correct for your shop is straightforward: does your maintenance scope include any torque specification above 200 ft-lb?

If it does — turboprop engine primary mount hardware, heavy landing gear trunnion and drag brace fasteners, propeller hub retention on high-power installations, or any structural fastener the AMM specifies between 201 and 300 ft-lb — the TRQ95901 is an incomplete program. A wrench operated above its rated maximum is not applying certified torque. The TRQ95902 closes that gap with the TRQ52403 as the 1/2 inch instrument, extending the set's coverage to 300 ft-lb with full ISO 6789 calibration and a serialized certificate at every point in that range. 

Every wrench in the set is ISO 6789-calibrated to ±3% clockwise and counterclockwise, each in its own individual HDPE case with its own serialized certificate of calibration. Pilot John International's ISO 17025-accredited calibration laboratory recertifies all three wrenches — including the TRQ52403's full 300 ft-lb range — at a single scheduled service event, issuing three NIST-traceable certificates on the same date. One service event. One expiry date. No ceiling gaps in the program.

Set Contents and Aviation Applications

• TRQ50402 — 1/4 in. Drive, 20–200 in-lb — Avionics panel and instrument bay hardware, pitot-static system fittings, small AN fasteners, ATA 23/24/31/34 component torque sequences; the correct wrench for all specifications below 200 in-lb where a larger drive operating at low torque is outside its calibrated accuracy band
• 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, control surface hardware, and the mid-range structural and powerplant work that constitutes the bulk of documented line maintenance torque specifications
• TRQ52403 — 1/2 in. Drive, 40–300 ft-lb — Wheel and brake assembly hardware, turboprop and piston engine primary mount bolts, heavy landing gear trunnion and drag brace attachment fasteners, propeller hub and retention hardware on high-power installations, wing spar attachment fittings and major structural joint fasteners — the full upper range of 1/2 inch drive torque work with no ceiling exceptions within the mechanical micrometer wrench category

Shared Specifications — All Three Wrenches

• ISO 6789 Full-Range Calibration — Tested from lowest marked value through 300 ft-lb maximum (TRQ52403); five readings per set point in both directions; meets and exceeds ASME B107.300 at every requirement
• ±3% Accuracy CW & CCW — Actual measured accuracy of each individual wrench 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 of all three instruments
• Dual-Direction Click Mechanism — Positive audible and tactile confirmation in both clockwise and counterclockwise directions on every wrench in the set
• 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 any of the three wrenches
• Coarse Diamond-Knurl Grip — Deep-cut centerline groove on all three handle lengths positions hand at the calibrated pivot point
• 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 in the set
• Tekton Recertification Available — All three wrenches are supported by Tekton's manufacturer recertification service
• Lifetime Warranty — No receipts, no time limits; applies to each individual wrench in the set

TRQ95902 vs. TRQ95901

The TRQ95901 is the correct set for shops whose heaviest 1/2 inch drive work stays at or below 200 ft-lb — light piston aircraft line maintenance, FBO service work on singles and light twins, and MRO work where no AMM fastener specification exceeds that ceiling. The TRQ95902 is the correct set for any shop whose maintenance scope includes even a single application above 200 ft-lb. A turboprop primary mount bolt. A heavy landing gear trunnion fastener. A propeller hub retention nut on a high-power installation. If that fastener exists in your AMM library, the TRQ52403 is the correct 1/2 inch instrument and the TRQ95902 is the correct set. For shops whose scope is genuinely mixed, the TRQ95903 4-piece set includes both 1/2 inch wrenches — the TRQ52402 and TRQ52403 — alongside the 1/4 and 3/8 inch instruments.