CDI 2502MRMH – 3/8" Drive Micrometer Torque Wrench

The CDI 2502MRMH is the widest-range compact inch-pound wrench in the CDI metal handle lineup — a 3/8-inch drive, dual-scale micrometer click-type torque wrench covering 30–250 in-lb (3.4–27.7 Nm) in a package that still weighs under a pound. For mechanics who need one compact inch-pound wrench that handles the broadest possible cross-section of light aircraft fasteners without stepping up to the longer, heavier 7502MRMH, this is the one.

The range that covers nearly everything in light aircraft engine work

At 30 in-lb the 2502MRMH handles magneto mounting hardware, fuel injection fittings, and accessory case fasteners. At 250 in-lb it reaches intake manifold studs, wheel fairing attach hardware, and certain prop flange bolts. Spark plugs at 360–420 in-lb land just above this wrench's ceiling — but every torque value below that point is covered. That breadth is why many A&P mechanics keep a 2502MRMH as their primary compact inch-pound wrench and only reach for a second tool when plug torque is the specific task.

Documentation-ready for certificated maintenance

Every 2502MRMH ships individually serialized with a NIST-traceable certificate of calibration, satisfying traceability requirements in FAA-accepted maintenance programs, Part 145 repair station QCMs, and ISO 9001 quality systems. Meets or exceeds ASME B107.14 and ISO 6789. Accuracy: ±4% CW, ±6% CCW of indicated value from 20–100% of full scale.

Built for the full range, not just the easy middle

• 11.25" overall length — slightly longer than the 2002MRMH to accommodate the extended 250 in-lb ceiling
• Knurled metal handle at 0.95 lb — still compact enough for confined access work
• Spring-loaded pull-down lock ring locks the setting before you touch the first fastener
• Laser-marked dual scale reads in-lb and Nm simultaneously — no conversion chart needed
• Fixed ratcheting 3/8" drive head with quick-release button for fast socket changes
• Audible click plus tactile impulse confirms torque in noisy hangar environments
• Rated to a minimum of 5,000 operating cycles
• Made in the USA by CDI Torque Products, a Snap-on Industrial Brands company

Where A&P mechanics reach for the 2502MRMH

• Magneto mounting hardware, ignition harness anchor nuts, and timing component fasteners
• Fuel injection servo and carburetor mounting flanges on Continental and Lycoming engines
• Intake manifold and induction system flange studs at the upper end of the range
• Wheel fairing attach hardware and landing gear door hinge bolts
• Engine accessory case and gearbox cover fasteners throughout the full range
• General AN/NAS airframe hardware across the complete 30–250 in-lb band

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 a torque wrench in a certificated shop is a calibrated instrument with a documentation trail, not just a hand tool. Our on-site ISO 17025-accredited calibration laboratory recertifies the 2502MRMH and returns it with a current NIST-traceable certificate — keeping it in your tool crib where it belongs.