Enstrom - F-28F Piston, 480B Turbine, 280FX Piston Mast Nut Tooling

Enstrom Helicopter Corp. Testimonial

“It took me less than 5 minutes for me to install the torque multiplier and torque the main rotor hub nut on an Enstrom; it was so simple that I had to take a minute to verify that I had actually completed the procedure.”

Enstrom Helicopter Corp. – Director of Product Support –


Mast Nut



Aircraft(s) / Engine(s):

F-28F Piston, 480B Turbine,280FX Piston

Catalog Number:


Wrench Series:

ATP 750 Series

Please contact us for more information on this model:

Product Specifications

Torque Range (ft-lbs)0 - 750
Torque Range (in-lbs)0 - 9,000
Torque Range (N.m.)0 - 1,017
Max. Input Required (ft-lbs)34 ft-lbs
Output Accuracy+/- 1% (+/- 0.4% upgrade available)
System Stability+/- 0.05% per °C (+/- 0.03% per °F)
Units of Measurementft-lbs, in-lbs, n/m, others
Operating Temperature0°F to 140°F (-18°C to 60°C)
Operating HumidityUp to 90%, Non-condensing
Multiplier Ratio22 to 1
Weight (lbs)4.5 lbs
Weight (kg)2.0 kg

Download product brochure

U.S. Patent Nos. 8,434,389 and 8,991,284

Canadian Patent No. 2,752,088

Japanese Patent No. 5699338