Greenlee 1818 (Mechanical): radius, deduct and gain
The Greenlee 1818 (Mechanical) is a mechanical bender for EMT, rigid (RMC), and IMC, 1/2" to 2". These are the numbers BendMate uses for each of its shoes.
Part numbers: 1818, 1818R (rigid/IMC), 1818T (EMT)
Specs by shoe
| Size | Centerline radius | Deduct | Gain | Notes |
|---|---|---|---|---|
| 3/4" EMT | 5 1/8" | 8 11/16" | 3 1/8" | Gain worked out from the radius. Shoe unit 18830. Radius from the Greenlee catalog, deduct from the 1818 manual. |
| 1" EMT | 6 7/16" | 10 1/4" | 3 15/16" | Gain worked out from the radius. Shoe unit 18830. Radius from the Greenlee catalog, deduct from the 1818 manual. |
| 1-1/4" EMT | 8 5/16" | 12 5/8" | 5 1/16" | Gain worked out from the radius. Shoe unit 18831. Radius from the Greenlee catalog, deduct from the 1818 manual. |
| 1-1/2" EMT | 8 5/16" | 12 15/16" | 5 5/16" | Gain worked out from the radius. Shoe unit 18831. Radius from the Greenlee catalog, deduct from the 1818 manual. |
| 2" EMT | 9 3/16" | 15" | 6 1/8" | Gain worked out from the radius. Shoe unit 18832. Radius from the Greenlee catalog, deduct from the 1818 manual. |
| 1/2" RMC | 2 11/16" | 6" | 2" | Gain worked out from the radius. Shoe unit 18827. Radius from the Greenlee catalog, deduct from the 1818 manual. This radius is below the NEC 4 in minimum. |
| 3/4" RMC | 4 5/8" | 8 1/8" | 3 1/16" | Gain worked out from the radius. Shoe unit 18827. Radius from the Greenlee catalog, deduct from the 1818 manual. |
| 1" RMC | 5 7/8" | 10 1/4" | 3 13/16" | Gain worked out from the radius. Shoe unit 18827. Radius from the Greenlee catalog, deduct from the 1818 manual. |
| 1-1/4" RMC | 7 3/8" | 12 3/8" | 4 13/16" | Gain worked out from the radius. Shoe unit 18828. Radius from the Greenlee catalog, deduct from the 1818 manual. |
| 1-1/2" RMC | 9" | 15" | 5 3/4" | Gain worked out from the radius. Shoe unit 18828. Radius from the Greenlee catalog, deduct from the 1818 manual. |
| 1/2" IMC | 2 11/16" | 5 5/8" | 1 15/16" | Gain worked out from the radius. Shoe unit 18827. Radius from the Greenlee catalog, deduct from the 1818 manual. This radius is below the NEC 4 in minimum. |
| 3/4" IMC | 4 5/8" | 8 1/8" | 3" | Gain worked out from the radius. Shoe unit 18827. Radius from the Greenlee catalog, deduct from the 1818 manual. |
| 1" IMC | 5 7/8" | 10 1/4" | 3 13/16" | Gain worked out from the radius. Shoe unit 18827. Radius from the Greenlee catalog, deduct from the 1818 manual. |
| 1-1/4" IMC | 7 3/8" | 12 1/2" | 4 13/16" | Gain worked out from the radius. Shoe unit 18828. Radius from the Greenlee catalog, deduct from the 1818 manual. |
Marks on the shoe
- 1Front edge of the hookLine your marks up here. This is the arrow the app’s marks are for.
The angle is read with the pointer on the degree scale.
Where the numbers come from
Bend with the Greenlee 1818 (Mechanical) 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 3/4" EMT on the Greenlee 1818 (Mechanical)?
8 11/16". Subtract it from the stub length to find where to mark a 90. The shoe’s centerline radius is 5 1/8" and its back-of-90 gain is 3 1/8".
What is the deduct for 1" EMT on the Greenlee 1818 (Mechanical)?
10 1/4". Subtract it from the stub length to find where to mark a 90. The shoe’s centerline radius is 6 7/16" and its back-of-90 gain is 3 15/16".
What is the deduct for 1-1/4" EMT on the Greenlee 1818 (Mechanical)?
12 5/8". Subtract it from the stub length to find where to mark a 90. The shoe’s centerline radius is 8 5/16" and its back-of-90 gain is 5 1/16".
What is the deduct for 1-1/2" EMT on the Greenlee 1818 (Mechanical)?
12 15/16". Subtract it from the stub length to find where to mark a 90. The shoe’s centerline radius is 8 5/16" and its back-of-90 gain is 5 5/16".
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.