Description
Snap-on’s metric J ring list ends at 27 mm, and this head is that final step. The Snap-on QJXM27A box end head fits the 27 mm hex that ISO and DIN both give to M18. Yet it keeps the short, light J body in your hand. That pairing makes sense when a big hex carries a small number, for example on soft or thin-walled parts.
Snap-on QJXM27A box end head size data
| Opening | 27 mm, 12-point, closed |
|---|---|
| Shank | J (0.425 in) |
| Outside diameter | 39 mm |
| Head depth | 17 mm |
| Pin to fastener center | 2.50 in |
Snap-on’s UK brochure and the partner listing match on every size here. Half of 39 mm is 19.5 mm, so leave at least that much room around the QJXM27A’s nut center.
Light work on an M18 hex
A steel M18 bolt in a structural joint usually needs far more than a J wrench delivers. So the QJXM27A serves a different group of parts. Think of plastic pump housings, brass fittings and aluminum covers with an M18 thread. These parts can strip or crack under a heavy pull, while a short tool lets the fitter feel the click. Still, treat these as examples and check each drawing.
Driving the Snap-on QJXM27A box end head
- QC2I75 adjustable, 5-75 ft-lb, 13 in long, for mixed values on a bench.
- QD2IN100A dual scale, 20-100 N·m, read in either unit.
- CTECH1J240A ControlTech, 1-20 ft-lb, for very low values with stored readings.
The brochure and the partner listing print different maximum ratings for this ring. So we omit the figure. Lost in HCM confirms it with the quote, and you then keep the body setting under it.
Need more torque at 27 mm?
The 27 mm row belongs to a small group, 24 to 27 mm, that lists all four shanks. The QYXM27A, QXXM27A and QZXM27A share the same 39 mm width and 17 mm depth. Therefore, you can move a joint to a stronger body without new clearance checks. In short, the Snap-on QJXM27A box end head covers the light end of a full size family.
Getting a QJXM27A quote
SMK Vietnam shows this ring for Lost in HCM, which supplies it and sets the price. Send your J body model and the joint value. Then request a QJXM27A quote from Lost in HCM. Nearby sizes sit under torque wrench heads and adaptors, and you can contact SMK Vietnam for help.
Questions on the 27 mm J ring
Is there a 29 mm or larger J ring?
No. Snap-on’s metric J list stops at 27 mm, and larger rings start on the Y shank.
Does the QJXM27A suit M18 nuts?
Yes for ISO and DIN M18 parts, which both use 27 mm. Measure special parts first.
How bulky is the 27 mm J ring?
It measures 39 mm across and 17 mm deep, the largest of the metric J rings.
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