Description
Big hex, small number: that is the job for the Snap-on QJXM23A box end head. It puts a closed 23 mm ring on the light J shank, so a short click wrench can tighten a large nut to a modest value. That combination suits brass gland nuts, plastic tank fittings and threaded caps, where too much force cracks the part. By contrast, a heavy body would read poorly at such low settings.
QJXM23A dimensions and reach
| Opening | 23 mm, 12-point, closed |
|---|---|
| Shank | J (0.425 in) |
| Outside diameter | 34 mm |
| Head depth | 15 mm |
| Pin to fastener center | 2.50 in (QJXM series) |
Snap-on’s UK brochure lists 23 mm rings on the J, Y and X shanks, with no Z option. Also, all three share the 34 mm width and 15 mm depth. Only the shank and the reach change between them.
No rating yet for the Snap-on QJXM23A box end head
The brochure and the partner listing give two different limits for this J ring. Therefore we print neither. Instead, Lost in HCM states the confirmed figure on the quote, and your setting stays at or below it. Note, too, that J rings from 13 mm to 27 mm all share one ceiling in the brochure. So a larger J ring does not carry more torque than a smaller one.
Light J wrenches that suit the Snap-on QJXM23A box end head
- QD2IN50A: 10-50 N·m (9.2-35.0 ft-lb), with both scales on one tube.
- QD2IN100A: 20-100 N·m (16.6-71.9 ft-lb), on the same 14-1/2 in length.
- QC2I75: an adjustable 5-75 ft-lb body, 13 in long.
- QC2P75: the preset version of that range, 11 in long.
Snap-on says the QD bodies need no adjustment maths, because their heads keep one consistent pin-to-fastener length. That keeps setup simple with the Snap-on QJXM23A box end head. For a QC body, ask Lost in HCM whether the 2.50 in reach needs a correction.
Measure before you buy a 23 mm ring
Standard ISO 4032 nuts jump from 21 mm for M14 to 24 mm for M16. Meanwhile, DIN 934 uses 22 mm and 24 mm for the same threads. A 23 mm hex therefore usually comes from a maker’s own part rather than a standard nut. Check the hex across the flats, and then order the QJXM23A once the caliper reads 23.
Lost in HCM pricing for the 23 mm QJXM23A
Lost in HCM supplies this ring and prices it, while SMK Vietnam lists it as a partner product. Request a quote from Lost in HCM with your J body, the part and the target value. Neighbor sizes sit under torque wrench heads and adaptors, and you can contact SMK Vietnam with any fit question.
Questions about the 23 mm J ring
Does a bigger J ring like the QJXM23A take more torque than a small one?
Not in Snap-on’s brochure. There, J rings from 13 to 27 mm all share the same ceiling.
Can I fit the QJXM23A to a QD3IN200B?
No. That body takes Y heads, so it needs the QYXM23A instead.
Why use a J body with the QJXM23A on a large hex?
Low values read better on a small scale. For example, the QD2IN50A starts at 9.2 ft-lb.
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