Greenlee 881 (Hydraulic, Cam Track, one-shot 90° shoes): radius, deduct and gain
The Greenlee 881 (Hydraulic, Cam Track, one-shot 90° shoes) is a hydraulic bender for EMT, rigid (RMC), and IMC, 2-1/2" to 4". These are the numbers BendMate uses for each of its shoes.
Part numbers: 881CT, 881CTD; shoe groups 27554, 27555, 31281, 31274
Specs by shoe
| Size | Centerline radius | Deduct | Gain | Notes |
|---|---|---|---|---|
| 2-1/2" EMT | 13 1/2" | 21 1/2" | 8 11/16" | Gain worked out from the radius. One-shot 90° shoe group 27554. |
| 3" EMT | 16" | 24" | 10 3/8" | Gain worked out from the radius. One-shot 90° shoe group 27555. |
| 3-1/2" EMT | 18 5/8" | 27 3/4" | 12" | Gain worked out from the radius. One-shot 90° shoe group 31281. Not in the 881CTD kit. |
| 4" EMT | 20 7/8" | 32 1/4" | 13 7/16" | Gain worked out from the radius. One-shot 90° shoe group 31274. |
| 2-1/2" RMC | 13 1/2" | 21 1/2" | 8 11/16" | Gain worked out from the radius. One-shot 90° shoe group 27554. |
| 3" RMC | 16" | 24 1/4" | 10 3/8" | Gain worked out from the radius. One-shot 90° shoe group 27555. |
| 3-1/2" RMC | 18 5/8" | 28 1/4" | 12" | Gain worked out from the radius. One-shot 90° shoe group 31281. Not in the 881CTD kit. |
| 4" RMC | 20 7/8" | 32 1/2" | 13 7/16" | Gain worked out from the radius. One-shot 90° shoe group 31274. |
| 2-1/2" IMC | 13 1/2" | 21 1/2" | 8 5/8" | Gain worked out from the radius. One-shot 90° shoe group 27554. |
| 3" IMC | 16" | 24 1/4" | 10 5/16" | Gain worked out from the radius. One-shot 90° shoe group 27555. |
| 3-1/2" IMC | 18 5/8" | 28 1/4" | 11 15/16" | Gain worked out from the radius. One-shot 90° shoe group 31281. Not in the 881CTD kit. |
| 4" IMC | 20 7/8" | 32 1/2" | 13 7/16" | Gain worked out from the radius. One-shot 90° shoe group 31274. |
Marks on the shoe
- 1Outside edge of the saddleLine your marks up here. This is the arrow the app’s marks are for.
The angle is read from how far the ram has travelled.
Where the numbers come from
Bend with the Greenlee 881 (Hydraulic, Cam Track, one-shot 90° shoes) in BendMate
Choose it in the app and every mark comes from these numbers. Edit any of them to match your own bender.
Common questions
What is the deduct for 2-1/2" EMT on the Greenlee 881 (Hydraulic, Cam Track, one-shot 90° shoes)?
21 1/2". Subtract it from the stub length to find where to mark a 90. The shoe’s centerline radius is 13 1/2" and its back-of-90 gain is 8 11/16".
What is the deduct for 3" EMT on the Greenlee 881 (Hydraulic, Cam Track, one-shot 90° shoes)?
24". Subtract it from the stub length to find where to mark a 90. The shoe’s centerline radius is 16" and its back-of-90 gain is 10 3/8".
What is the deduct for 3-1/2" EMT on the Greenlee 881 (Hydraulic, Cam Track, one-shot 90° shoes)?
27 3/4". Subtract it from the stub length to find where to mark a 90. The shoe’s centerline radius is 18 5/8" and its back-of-90 gain is 12".
What is the deduct for 4" EMT on the Greenlee 881 (Hydraulic, Cam Track, one-shot 90° shoes)?
32 1/4". Subtract it from the stub length to find where to mark a 90. The shoe’s centerline radius is 20 7/8" and its back-of-90 gain is 13 7/16".
Brand and model names only identify the bender. BendMate isn’t affiliated with or endorsed by Greenlee. Check the numbers against the markings on your own bender.