CDI 50T-I – J-Shank Preset Torque Wrench

The CDI 50T-I is a J-shank preset interchangeable-head torque wrench designed for production lines and repetitive assembly operations in the 15–75 ft-lb (20.3–101.7 Nm) range — the first foot-pound preset in the CDI T-I family and the one that covers the most frequently repeated high-value torque operation in light aircraft maintenance: spark plug installation.

The preset wrench for spark plug installation fleets

Continental and Lycoming engines specify spark plug installation at 300–420 in-lb depending on thread size and revision — 25–35 ft-lb, sitting squarely in the 50T-I's accurate working band. An FBO running oil changes and 100-hour inspections on a fleet of trainers sets the wrench once and runs every plug across the entire fleet. No scale check between aircraft, no over-torque from a distracted operator, no under-torque from a tech who forgot to re-set after the previous job. On a fleet of 20 aircraft with 8 plugs each, that's 160 identical torque applications from one preset setting — and that consistency is what engine manufacturers and FAA-accepted maintenance programs require from spark plug installation practice.

User-set vs. factory-set: which to order

The 50T-I ships unset — the operator sets the torque value within 15–75 ft-lb. No calibration certificate is included. For environments requiring NIST-traceable calibration documentation at a specific preset value — Part 145 shops, AS9100 facilities, or programs with torque traceability requirements — order the 50T-I-SET, which CDI factory-presets to a value specified at order and ships with a NIST-traceable calibration certificate. Specify the required value when ordering; allow 10 days lead time. The 50T-I-SET is the confirmed factory-preset counterpart for this SKU.

Documentation and compliance

Meets ASME B107.14 and ISO 6789. Accuracy: ±4% CW of indicated value from 20–100% of full scale. The user-set 50T-I does not ship with a calibration certificate — if your QCM or quality program requires NIST-traceable documentation for preset torque tools, select the 50T-I-SET.

Built for the highest-frequency repetitive torque operations in light GA

• 15–75 ft-lb (20.3–101.7 Nm) — the foot-pound range covering spark plugs, wheel hardware, and cowling structural attach
• Spark plug installation at 25–35 ft-lb (300–420 in-lb) sits in the middle of the accurate working band
• J-shank (27/64") accepts open-end, box-end, flare nut, and ratchet drive heads — 100+ configurations including spark plug socket drives
• Tamper-proof preset eliminates per-cycle setting verification across fleet-wide repetitive operations
• 11.00" overall length and 1.40 lb — compact for FBO shop and flight line maintenance kits
• Audible click plus tactile impulse confirms torque on each plug without scale verification
• Cushion grip handle designed for repetitive use across a full maintenance shift
• Made in the USA by CDI Torque Products, a Snap-on Industrial Brands company

Where FBOs, maintenance shops, and production lines use the 50T-I

• Spark plug installation on Continental and Lycoming engines across flight school and trainer fleets (25–35 ft-lb)
• Wheel and axle hardware on Cessna 172, Piper Archer, and similar light trainer and utility aircraft
• Brake caliper mounting bolts and nose gear hardware on light GA aircraft
• Engine cowling and nacelle structural attach hardware (20–50 ft-lb)
• Wheel pant and fairing attach bolts on production and high-cycle inspection environments
• Any production or fleet maintenance operation where 15–75 ft-lb is applied repeatedly to identical fasteners across identical aircraft

Why source aviation tooling from Pilot John International

Pilot John International is an aviation-specialist distributor — not a general industrial catalog. We serve Part 145 repair stations, FBOs, MRO operations, and flight schools across the U.S. We understand that spark plug torque documentation is one of the most frequently examined items in a Part 145 inspection or an engine warranty review — and that a preset wrench used consistently across a fleet is a stronger documented practice than an adjustable wrench set anew each time. Our on-site ISO 17025-accredited calibration laboratory recertifies both the 50T-I and the 50T-I-SET when they come due.