Mil-Spec pulleys are manufactured with the highest quality materials and subjected to the most stringent requirements of performance testing. We source military specification pulleys only from qualified producers, overseen by the United States Military and qualified to certify each and every pulley they ship.
We then incorporate the peak performance of military specification pulleys into your application and provide rugged and dependable engineered solutions that ensure a long service life.
All Pulleys Conform to MIL-DTL-7034
All military specification (mil-spec) pulleys conform to MIL-DTL-7034 (latest rev). We offer the industry’s leading products for use in a variety of applications and these pulleys are no different.
Military specification pulleys are used in primary and secondary flight control systems and will exceed the performance of commercial pulleys in many applications. When quality and performance matter, trust Loos and Company to provide the highest quality mil-spec pulleys.
Department of Defense Specifications
Listed below are some of the more popular series we produce:
MIL-DTL-7034/1 – Cross Reference MS20219 (superseded AN219):
- Pulley, Groove, Secondary Control, Aircraft
MIL-DTL-7034/3 – Cross Reference MS20221:
- Pulley, Groove, Secondary Control, Aircraft
MIL-DTL-7034/2 – Cross Reference MS20220 (superseded AN220):
- Pulley, Groove, Flight Control, Aircraft
MIL-DTL-7034/4 – Cross Reference MS24566 (superseded AN210B):
- Pulley, Control, Anti-friction Bearing, Aircraft
Military Specification Series Pulleys
The tables below represent standard materials, constructions, and sizes that we offer. If you don’t see what you are looking for, contact a sales representative for assistance. As a manufacturer, we are fully capable of making custom products to meet your performance requirements.
Mil Spec MS20219
| OD | IR OD | IR Width | Groove Diameter | Cable Size | Bore Diameter | Pulley Assembly Max Weight (lbs.) | Allowable Load on Pulley (lbs.) | Max Limit Load on Cable Independant of Wrap Angle (1/8" Cable) | Max Limit (5/32" Cable) | Item # |
|---|---|---|---|---|---|---|---|---|---|---|
| 1.312 | 0.423 | 0.438 | 1 | 1/16", 5/32" | 0.25 | 0.058 | 480 | 307 | 460 | MS20219-1 |
| 1.75 | 0.423 | 0.438 | 1.438 | 1/16", 5/32" | 0.25 | 0.066 | 480 | 307 | 460 | MS20219-2 |
| 1.75 | 0.769 | 0.438 | 1.438 | 1/16", 5/32" | 0.625 | 0.096 | 480 | 307 | 460 | MS20219-3 |
| 2.625 | 0.426 | 0.438 | 2.312 | 1/16", 5/32" | 0.25 | 0.11 | 480 | 307 | 460 | MS20219-4 |
| 2.625 | 0.769 | 0.438 | 2.312 | 1/16", 5/32" | 0.625 | 0.125 | 480 | 307 | 460 | MS20219-5 |
Mil Spec MS20220
| OD | IR OD | IR Width | Groove Diameter | Cable Size | Bore Diameter | Pulley Assembly Max Weight (lbs.) | Allowable Load on Pulley (lbs.) | Max Limit Load on Cable Independant of Wrap Angle (1/8" Cable) | Max Limit (5/32" Cable) | Max Limit (3/16" Cable) | Item # |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 1.75 | 0.455 | 0.625 | 1.75 | 1/8", 5/32", 3/16" | 0.3125 | 0.07 | 500 | 307 | 1040 | 1250 | 20220-1 |
| 3 | 0.455 | 0.625 | 3 | 1/8", 5/32", 3/16" | 0.3125 | 0.175 | 1680 | 307 | 1040 | 1250 | 20220-2 |
| 4.25 | 0.455 | 0.625 | 4.25 | 1/8", 5/32", 3/16" | 0.3125 | 0.3125 | 2500 | 307 | 1040 | 1250 | 20220-3 |
| 5.5 | 0.455 | 0.625 | 5.5 | 1/8", 5/32", 3/16" | 0.3125 | 0.3125 | 2500 | 307 | 1040 | 1250 | 20220-4 |
Mil Spec MS20221
| OD | IR OD | IR Width | Groove Diameter | Cable Size | Bore Diameter | Pulley Assembly Max Weight (lbs.) | Allowable Load on Pulley (lbs.) | Max Limit Load on Cable Independant of Wrap Angle (3/16" Cable) | Max Limit (7/32" Cable) | Max Limit 1/4" Cable) | Item # |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 2.625 | 0.455 | 0.625 | 2 | 3/16", 7/32", 1/4" | 0.3125 | 0.165 | 2500 | 2620 | 3060 | 3500 | 20221A1 |
| 4.125 | 0.768 | 0.75 | 3.5 | 3/16", 7/32", 1/4" | 0.5 | 0.45 | 4900 | 2620 | 3060 | 3500 | 20221-2 |
| 5.625 | 0.768 | 0.75 | 5 | 3/16", 7/32", 1/4" | 0.5 | 0.45 | 7000 | 2620 | 3060 | 3500 | 2-221-3 |
Mil Spec MS24566
| OD | IR Width | Bore Diameter | Cable Size | Groove Diameter | Groove Radius | Width @ Flange Pointsjh | Flange Thickness | Pulley Assembly Weight (lbs.) | Allowable Load on Pulley (lbs.) | Item # |
|---|---|---|---|---|---|---|---|---|---|---|
| 1.25 | 0.297 | 0.19 | 1/16", 3/32" | 0.972 | .05- + 0 - .003 | .250 + 0 - .003 | .060 (+/-) .005 | 0.026 | 300 | MS24566-1B |
| 2.5 | 0.297 | 0.19 | 1/16", 3/32" | 0.222 | .112 +0 - .003 | .250 + 0 - .003 | .060 (+/-) .005 | 0.075 | 500 | MS24566-2B |
| 2 | 0.484 | 0.25 | 1/8", 5/32", 3/16" | 1.51 | .112 +0 - .005 | .422 + 0 - .012 | .086 (+/-) .006 | 0.09 | 600 | MS24566-3B |
| 3.5 | 0.484 | 0.25 | 1/8", 5/32", 3/16" | 3.01 | .112 + 0 - .003 | .422 + 0 - .012 | .086 (+/-) .006 | 0.2 | 1200 | MS24566-4B |
| 5 | 0.62 | 0.375 | 3/16", 7/32", 1/4" | 4.374 | .145 + 0 - .005 | .507 + 0 - .014 | .092 (+/-) .007 | 0.5 | 3000 | MS24566-5B |
| 6 | 0.62 | 0.375 | 3/16", 7/32", 1/4" | 5.374 | .145 + 0 - .005 | .507 + 0 - .014 | .092 (+/-) .007 | 0.66 | 4000 | MS24566-6B |
