What changes at 60 degrees
With 60 degree fittings, the travel is the true offset times 1.155. The run is the true offset times 0.577. Every inch of true offset costs 0.577 inch of length in a bent conduit run (shrink).
- Travel = true offset x 1.155
- Run = true offset x 0.577
- Shrink per inch of offset = 0.577 in
When to use 60 degrees
A 60 degree fitting is also called a 1/6 bend. It makes the run short. For a true offset of 15 inches, the run is only 8 11/16". The cost is a sharper turn in the flow and a bigger shrink in conduit.
Not every maker sells 60 degree fittings in every size, so check stock before you plan the job.
Shrink at 60 degrees
Shrink is 0.577 inch for each inch of true offset. Many field charts round this to 1/2 inch. The tool shows the exact value.
Rise and roll pairs at 60 degrees
These pairs give a whole number for the true offset, so you can check your own math against them.
| Rise | Roll | True offset | Travel at 60° | Run at 60° |
|---|---|---|---|---|
| 3" | 4" | 5.00" | 5 3/4" (5.77) | 2 7/8" (2.89) |
| 6" | 8" | 10.00" | 11 9/16" (11.55) | 5 3/4" (5.77) |
| 5" | 12" | 13.00" | 15" (15.01) | 7 1/2" (7.51) |
| 12" | 9" | 15.00" | 17 5/16" (17.32) | 8 11/16" (8.66) |
| 8" | 15" | 17.00" | 19 5/8" (19.63) | 9 13/16" (9.81) |
| 24" | 7" | 25.00" | 28 7/8" (28.87) | 14 7/16" (14.43) |
Compare with the other angles
The offset is the same. Only the fitting angle changes. A smaller angle makes a longer travel and a longer run.
| Angle | Multiplier | Travel | Run | Shrink |
|---|---|---|---|---|
| 22.5° | 2.613 | 39 3/16" (39.20) | 36 3/16" (36.21) | 3" (2.98) |
| 30° | 2.000 | 30" (30.00) | 26" (25.98) | 4" (4.02) |
| 45° | 1.414 | 21 3/16" (21.21) | 15" (15.00) | 6 3/16" (6.21) |
| 60° | 1.155 | 17 5/16" (17.32) | 8 11/16" (8.66) | 8 11/16" (8.66) |
Questions
What is the multiplier for 60 degrees?
It is 1.155. Multiply the true offset by it to get the travel.
Is there a catalog take-off for 60 degree fittings?
The catalogs this tool uses list 45 degree fittings only. Type the take-off of your own fitting.