The CDI 6004MFRPH is a 3/4-inch drive, dual-scale micrometer click-type torque wrench covering 100–600 ft-lb (135.6–813.6 Nm) — mechanically identical to the 6004MFRMH in every specification including weight, with an ergonomic comfort-grip polymer handle instead of knurled metal. At this tier of the CDI family, both variants weigh 11.85 lb. The benefit of the comfort-grip is not about reducing the load — it's about grip quality and thermal comfort during sustained two-handed application of 300–600 ft-lb torque loads over extended MRO work sessions.
Why the comfort-grip argument changes at 3/4-inch drive
Applying 400–600 ft-lb with a 42-inch handle is a sustained, full-body motion. The grip is firm and held for several seconds per fastener, repeated across multi-bolt sequences on turboprop prop retention, landing gear trunnion hardware, and engine mount fasteners. The knurled metal handle concentrates contact pressure on the ridges of the knurl — secure, but fatiguing across long sequences where the same motion repeats many times. The comfort-grip polymer distributes that contact pressure more evenly across the palm and fingers. In cold MRO bays and outdoor ramp environments where turboprop maintenance often occurs, the insulation against a 40°F metal surface on a tool gripped for hours at a stretch is a meaningful quality-of-work factor that experienced turboprop technicians notice.
When the metal handle (6004MFRMH) is the better choice
The 6004MFRMH knurled metal handle provides better grip in oily or wet conditions and greater long-term resistance to hydraulic fluid, avgas, and shop solvents. Shops doing fuel system and hydraulic work where heavy fluid contact is routine typically prefer the metal handle. Both wrenches carry the same internal mechanism, the same ±4% CW accuracy specification, and the same NIST-traceable documentation — the difference is entirely the grip surface.
Documentation-ready for the most scrutinized work in certificated maintenance
Every 6004MFRPH 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 specs to the 6004MFRMH, different grip
- Same 3/4" drive, 100–600 ft-lb (135.6–813.6 Nm) range, 5 ft-lb graduation as the 6004MFRMH
- Same 42" overall length and 11.85 lb weight — same mechanical profile, different grip surface
- Ergonomic comfort-grip polymer distributes sustained grip pressure during 300–600 ft-lb application sequences
- Thermal insulation matters in cold MRO bays and outdoor ramp environments during extended work sessions
- Spring-loaded pull-down lock ring locks the setting through multi-bolt structural sequences
- Laser-marked dual scale reads ft-lb and Nm simultaneously — no conversion chart needed
- Fixed ratcheting 3/4" drive head with quick-release button
- Audible click plus tactile impulse confirms torque in noisy MRO shop 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 Part 145 shops and MRO facilities use the 6004MFRPH
- Propeller flange retention on PT6A-powered King Air C90/200/300 and PC-12 (350–500 ft-lb)
- Propeller retention hardware on TPE331-powered aircraft including Merlin and Metro series
- Main landing gear trunnion bearing and oleo strut attach hardware on Citation CJ/Phenom 300 class
- Engine mount through-bolts and firewall structural attach on King Air and Pilatus platforms (300–500 ft-lb)
- Large-bore piston engine cylinder holddown stud nuts at the upper end of the range
- Aircraft tug and tow tractor final drive and differential housing hardware (400–600 ft-lb)
- Large maintenance stand and ground support equipment structural anchor hardware
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. Whether your shop runs metal or comfort-grip handles on high-torque work, both CDI variants come from the same aviation-specialist source with the same NIST-traceable documentation — and both can be recertified by our on-site ISO 17025-accredited calibration laboratory when they come due.
| General Information | |
|---|---|
| Part # | 6004MFRPH |
| Manufacturer | CDI |
| Specifications | |
|---|---|
| Accuracy (CCW) | |
| Accuracy (CW) | |
| Calibration Certificate | Individually serialized, NIST-traceable |
| Country of Origin | USA |
| Cycle Rating | 5,000 cycles minimum |
| Drive Size | 3/4" |
| Graduation | 5 ft-lb |
| Handle | Ergonomic comfort-grip polymer, dual scale, laser marked |
| Head Type | Fixed ratcheting, quick-release button |
| Indicator | Audible click + tactile impulse |
| Lock Mechanism | Spring-loaded pull-down lock ring |
| Overall Length | 42.00 in |
| Standards | ASME B107.14, ISO 6789 |
| Torque Range | 100 |
| Warranty | 1-year manufacturer |
| Weight | 11.85 lb |
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QUESTIONS & ANSWERS
Yes. The 6004MFRPH ships with an individually serialized, NIST-traceable certificate of calibration and meets ASME B107.14 and ISO 6789 — the documentation requirements typically specified in Part 145 repair station Quality Control Manuals. Always verify against your facility's specific RSM requirements.
The torque range (100–600 ft-lb), accuracy (±4% CW), graduation (5 ft-lb), drive size (3/4"), overall length (42"), and weight (11.85 lb) are identical. The 6004MFRMH has a knurled metal handle; the 6004MFRPH has an ergonomic comfort-grip polymer handle. At this weight and length, the benefit is grip pressure distribution and thermal comfort during extended high-torque sequences — not weight reduction. Choose the MFRPH for clean, dry MRO environments doing sustained turboprop and structural work. Choose the MFRMH for work environments with heavy fluid exposure.
The 6004MFRPH covers 100–600 ft-lb (135.6–813.6 Nm) in 5 ft-lb increments. Accuracy is ±4% clockwise and ±6% counter-clockwise of indicated value from 20% to 100% of full scale. The 5 ft-lb graduation is appropriate for AMM specifications in this range, which are stated in 10 ft-lb or larger increments.
