CDI 6004MFRMH-TH – 3/4" Tethered Torque Wrench

The CDI 6004MFRMH-TH is a 3/4-inch drive, dual-scale micrometer click-type torque wrench covering 100–600 ft-lb (135.6–813.6 Nm) with a factory-installed tether attachment point — the higher-range companion to the 2503MFRMH-TH for elevated torque work that a 1/2-inch drive cannot handle. At 42 inches long and 7.35 lb, the tether point is not optional for this tool at height. A 7.35 lb, 42-inch wrench at 400–500 ft-lb from a maintenance stand 10–15 feet up carries real kinetic energy if it's dropped. The tether prevents the drop; the tether point makes it practical to use one.

The tethered 3/4-inch drive wrench for turboprop and business jet elevated maintenance

Propeller retention on PT6A-powered King Airs, PC-12s, and TBM aircraft is performed with the technician on a stand, prop hub at shoulder height, working against 350–500 ft-lb of retention torque with a 3/4-inch drive wrench. Engine mount hardware on pylon-mounted and high-wing configurations, nacelle structural attach, and wing root hardware in the 300–500 ft-lb band are also elevated work at exactly this range. FOD programs at certificated repair stations and airline maintenance facilities require tools be secured near open aircraft structures — the factory-installed tether point on the 6004MFRMH-TH satisfies that requirement without modification records or aftermarket attachments.

FOD prevention at 3/4-inch drive torque loads

A dropped tool at 3/4-inch drive torque levels is a different category of FOD event than a dropped ratchet or socket. A 7.35 lb, 42-inch wrench dropped from 12 feet onto an open engine bay, an aircraft skin panel, or a technician below can cause structural damage, personal injury, and the mandatory reporting, inspection, and investigation that follows. The tether point eliminates the drop rather than documenting its consequences. FOD programs and AS9100 safety management systems increasingly require tethered tools at any height above aircraft structures — factory provision is the cleanest compliance path.

Documentation-ready for certificated maintenance

Every 6004MFRMH-TH 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.

Identical torque specs to the 6004MFRMH — plus the tether, minus 4.5 lb

• Same 3/4" drive, 100–600 ft-lb (135.6–813.6 Nm) range, 5 ft-lb graduation as the 6004MFRMH
• 7.35 lb versus 11.85 lb on the standard 6004MFRMH — 4.5 lb lighter with the tether provision included
• Factory-installed tether attachment point — original design, not an aftermarket modification
• Satisfies FOD prevention program tool control requirements in Part 145 and airline MRO environments
• Supports OSHA work-at-height tool tethering and AS9100/QMS safety management program compliance
• 42" overall length provides the leverage needed for 400–600 ft-lb application from a stand
• Spring-loaded pull-down lock ring locks the setting before ascending to the work position
• Laser-marked dual scale reads ft-lb and Nm simultaneously
• Fixed ratcheting 3/4" drive head with quick-release button
• Audible click plus tactile impulse confirms torque when elevated work position limits sightlines
• Rated to a minimum of 5,000 operating cycles
• Made in the USA by CDI Torque Products, a Snap-on Industrial Brands company

Where FOD programs and elevated maintenance call for the 6004MFRMH-TH

• Propeller retention on PT6A-powered King Air C90/200/300 and PC-12 from maintenance stands (350–500 ft-lb)
• Propeller retention on TBM 700/850/900 series and other high-wing turboprop singles
• Engine mount attach and nacelle structural hardware on pylon-mounted and high-wing configurations (300–500 ft-lb)
• Wing root and center section structural attach hardware accessed from scaffolding
• Landing gear bay structural fasteners on retractable gear aircraft at stand height (200–400 ft-lb)
• Any 3/4" drive, 100–600 ft-lb fastener within scope of an active FOD or work-at-height tool program

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 turboprop maintenance, FOD programs, and what it means to have a tethered tool requirement in your QCM — because our customers live under those requirements. Our on-site ISO 17025-accredited calibration laboratory recertifies the 6004MFRMH-TH and returns it with documentation that satisfies both your tool crib and your FOD program review.