Description
Inside a control cabinet or under a conveyor guard, a 23 in wrench simply will not fit. The Snap-on QJOM18A open end head keeps 18 mm work on the J shank (0.425 in), where Snap-on bodies run from 6 to 14-1/2 in long. So a technician can reach an ISO M12 nut in a cramped bay and still stop at a measured value.
Short J bodies for the QJOM18A
| Body | Type | Range | Length |
|---|---|---|---|
| QC2P75 | Preset | 5-75 ft-lb | 11 in |
| QC2I75 | Adjustable | 5-75 ft-lb | 13 in |
| QD2IN50A | Adjustable, dual scale | 10-50 N·m | 14-1/2 in |
| QD2IN100A | Adjustable, dual scale | 20-100 N·m | 14-1/2 in |
By contrast, the Y and X QD bodies run 23 in and weigh 3.36 lb, against 2.3 lb for the J models. That gap matters when you carry the QJOM18A kit all day.
Rating of the Snap-on QJOM18A open end head
Snap-on’s two sources print different limits for the J version of this jaw. For that reason, no figure appears here. Lost in HCM confirms it on the quote, and you then set the body under that value. Meanwhile, both sources agree that the Y and X 18 mm heads carry about 115 ft-lb.
Signs you need a bigger shank than the QJOM18A
- The joint spec sits near or above the top of the J scales.
- High-strength M12 nuts on a frame or motor base call for it.
- Your crew already carries a Y or X body for other jobs.
In those cases, the QYOM18A or the QXOM18A takes over. Otherwise, the QJOM18A on a J body stays lighter and fits more places.
18 mm hex check before buying the QJOM18A
ISO 4032 gives M12 an 18 mm hex, but DIN 934 and older JIS tables use 19 mm. So European and older Japanese machines may need the 19 mm jaw instead. Before you order the QJOM18A, check one nut from the job with a caliper. Also note that the head measures about 37 mm across, as both Snap-on sources show.
Pricing the Snap-on QJOM18A open end head
Supply and quotes come from Lost in HCM, and SMK Vietnam lists the QJOM18A for that partner. Request a quote from Lost in HCM, giving your J body model and the M12 spec. You can also scan torque wrench heads and adaptors for the 19 mm jaw, or contact SMK Vietnam.
Common questions on the 18 mm J jaw
Is the QJOM18A a match for a 19 mm DIN nut?
No. It is an 18 mm jaw, so a DIN 934 M12 nut with a 19 mm hex needs the QJOM19A.
Which J body suits a 30 ft-lb M12 spec?
The QD2IN100A puts 30 ft-lb in the lower half of its 16.6 to 71.9 ft-lb scale. The QD2IN50A also reaches it, close to its top end.
Can I mount the QJOM18A on a QD3IN200B?
That body uses a Y shank, so it will not. The QJOM18A locks into J bodies only.
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