Description
M27 is a big bolt, and ISO gives it a 41 mm hex. You may find it on crane fittings, large pump frames, heavy flanges and machine tie rods. The Snap-on QXOM41A open end head lets an X-shank torque body take that hex from the side, so a pipe or rod above the nut does not stop the job.
Size and rating of the QXOM41A
| Item | QXOM41A |
|---|---|
| Opening | 41 mm, open end |
| Shank | X (0.735 in) |
| Fastener center to pin | 4.50 in |
| Max working torque | 240 ft-lb, about 325 N·m |
| O.D. | 83 mm |
| Head depth | 18 mm |
CAT1500i prints these values, and they match the source listing. The UK brochure table stops at 36 mm, so it offers no second check.
Will 240 ft-lb cover your M27 joint?
Many M27 joints call for more torque than an open jaw can carry, especially with high-strength bolts. So compare the drawing value with the QXOM41A limit first. If the spec runs higher, the dual-pin QZOM41ADP carries 480 ft-lb on a Z body. On the other hand, the Y-shank QYOM41 stops at 160 ft-lb. The Snap-on QXOM41A open end head fills the middle, which suits union nuts, jam nuts and lower-grade bolts.
X bodies for the Snap-on QXOM41A open end head
CAT1500i lists two X bodies. The QC4P300 presets from 60 to 300 ft-lb, and it measures 27 in long. By contrast, the QD3IN350A adjusts from 70 to 350 N·m, which equals about 59 to 251 ft-lb. Its range covers the full head limit with little to spare, so you use most of its scale. Whichever you choose, keep the setting at or under 240 ft-lb.
Handling an 83 mm head
The QXOM41A measures 83 mm across, so check the space around the nut before you start. Next, push the jaw all the way onto the flats so it bears on their full width. Pull with a steady hand and stop at the click. Also, look for jaw spread after heavy use, since a sprung jaw can slip.
How Lost in HCM quotes the Snap-on QXOM41A open end head
Lost in HCM supplies the QXOM41A, and SMK Vietnam lists it on this partner page. Request a quote from Lost in HCM with your X body and the M27 torque spec. If you still weigh Y, X and Z, browse torque wrench heads and adaptors or contact SMK Vietnam.
M27 and QXOM41A questions
Is 41 mm the ISO hex for M27?
Yes, for standard ISO M27 hex nuts and bolts. Heavy hex parts can differ, so measure first.
Does Snap-on offer a 41 mm open end head on the J shank?
No. CAT1500i lists 41 mm open end heads in Y, X and Z only.
How deep is the QXOM41A?
It is 18 mm deep and 83 mm across, according to CAT1500i.
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