1" EMT bender deduct and take-up
By Andrew ·
Quick answer
On most hand benders the deduct for 1" EMT is 8", 2" more than for 3/4". Subtract it from the stub length and mark the conduit that far from the end, lining the mark up with the arrow. A 24" stub is marked at 16". Check the deduct on your own bender.
1" EMT deduct by bender
Most hand benders deduct 8" for 1" EMT.
| Bender | Deduct (take-up) | Centerline radius |
|---|---|---|
| Gardner Bender Big Ben (Aluminum hand bender) | 8" | 6 3/8" |
| Greenlee aluminum hand bender | 8" | 6 1/2" |
| Greenlee iron hand bender | 8" | 6 1/2" |
| IDEAL ductile iron hand bender | 8" | 5 3/4" |
| Klein Tools iron hand bender | 8" | 7 3/8" |
| Milwaukee aluminum hand bender | 8" | 5 3/4" |
| Milwaukee iron hand bender | 8" | 5 3/4" |
| Gardner Bender Sidewinder (Mechanical, Chicago-style) | 9 3/4" | 6 7/16" |
| Greenlee 1818 (Mechanical) | 10 1/4" | 6 7/16" |
| Gardner Bender B2000 Cyclone (Large combo shoe) | 10 3/8" | 6 1/2" |
| Current Tools 77 Series (Multi-shoe) | 10 3/4" | 6 3/4" |
| Gardner Bender Electric Sidewinder (Multiple 180° shoes) | 10 3/4" | 6 3/4" |
| Greenlee 555 (Multi-shoe) | 10 3/4" | 6 3/4" |
| iToolco B2 Rapid Fire (Large combo shoe) | 10 7/8" | 7" |
| Current Tools 747 Omni (Combo shoe) | 11" | 7" |
| Current Tools 77 Series (Single shoe) | 11" | 7" |
| Greenlee 555 (Combo shoe) | 11" | 7" |
| Greenlee 555 (Single shoe) | 11" | 7" |
| Greenlee 854DX (Large combo shoe) | 11 13/16" | 7" |
| Greenlee 855GX (Standard shoe) | 11 7/8" | 7" |
A bigger bender, a bigger deduct
One-inch EMT is where hand bending starts to feel heavy. The shoe is much larger than the 3/4" one, and the deduct jumps from 6" to 8". The back of the 90 now sits a long way from the arrow, so a stub shorter than 8" cannot be made with that mark at all.
The deduct is not the only number the size changes. The gain, the conduit a 90 saves by going round the corner, also grows with the radius, and you need it to cut a length.
cut length = stub + other leg − gainMarks for common 1" stubs
| Stub length | Mark at |
|---|---|
| 10" | 2" |
| 12" | 4" |
| 18" | 10" |
| 24" | 16" |
| 30" | 22" |
| 36" | 28" |
| 48" | 40" |
- Stub length
- 24"
- Deduct
- 8"
- Mark at
- 16"
Hand benders for 1" EMT
The 1" hand bender is usually a heavier iron head than the smaller sizes, and not every brand makes one in every material. Because the head is heavy and the effort is high, many shops move to a mechanical or electric bender at 1" and above, and then the deduct is whatever that machine’s shoe says.
- Read the deduct off the head if it is printed there, or from the manual for your bender.
- Bend a test 90 in a scrap with a stub of 24", marked at 16", and measure the result.
- If the stub is more than a sixteenth out, correct the deduct by that amount. A bad deduct on a large size is a visible mistake: use 6" on a 1" head and the stub comes out 2" long.
Why the mark moves so far at 1"
Going from 3/4" to 1" EMT moves the mark 2" for the same stub. It is the reason a bender that has been used for one size all day gives the wrong stub when you switch to 1" without changing the number: if the 3/4" deduct is still in your head, every 1" stub comes out 2" long.
Get the marks for your bender
BendMate works this out from your bender’s radius and deduct, flags a bend that won’t work, and shows you every mark.
Common questions
What is the deduct for 1 inch EMT?
8" on most hand benders, 2" more than 3/4" EMT. Subtract it from the stub length to find the mark.
How do I mark a 24 inch stub in 1 inch EMT?
Subtract the deduct: 24" minus 8" is 16". Mark the conduit there from the end and line it up with the arrow.
What is the shortest stub I can bend in 1 inch EMT?
The stub has to be longer than the 8" deduct, or the mark would fall off the end of the conduit. In practice, leave a few inches more so the conduit seats in the hook.