Description
Small hex parts often hide in the tightest spots: instrument fittings, sensor nuts and adjusters inside panels. The Snap-on QJXM9A box end head reaches them with a closed 9 mm ring on the J shank. It is only 14 mm across and 6 mm deep. So it slides in where a socket and extension would stand far too tall.
What Snap-on publishes for the Snap-on QJXM9A box end head
- Opening: 9 mm, 12-point, closed.
- Shank: J (0.425 in). At 9 mm, the brochure lists no other shank.
- Maximum recommended working torque: 355 in-lb, about 29.6 ft-lb or 40 N·m.
- O.D. 14 mm and depth 6 mm, so about 7 mm of side room is enough.
- Reach from the locking pin to the fastener center: 2.50 in.
Snap-on’s UK brochure and the partner listing agree on this rating, since 355 in-lb rounds to the listed 30 ft-lb.
In-lb bodies that stay under 355
Several J bodies never reach the ring limit, which removes the risk of a high setting. For example, the QC1P100 preset spans 15-100 in-lb, and the QC1I200 adjusts from 40 to 200 in-lb. Likewise, the QC1P300 preset tops out at 300 in-lb. The electronic CTECH1J240A reads from 1.0 to 20.0 ft-lb, which is 12-240 in-lb. On the other hand, the QD2IN50A climbs to 35.0 ft-lb, or 420 in-lb. So cap that body before it drives the QJXM9A.
Keeping the QJXM9A clean and square
A small ring wears faster if grit packs into its points. Therefore, blow it clean after each shift and store it dry. Also, check that the ring sits square before each pull, because a tilted ring can round a soft fitting. In addition, Snap-on’s brochure says not to break fasteners loose with these tools. In practice, free a stuck part with a hand wrench first, then finish with the Snap-on QJXM9A box end head.
Where to request the QJXM9A
SMK Vietnam lists this ring for its partner Lost in HCM, which supplies it and builds the price. Name your J body and the value when you request a quote from Lost in HCM. Other small rings sit under torque wrench heads and adaptors, or you can contact SMK Vietnam with a question about fit.
Small-ring FAQ for the QJXM9A
Which J bodies can exceed 355 in-lb?
The QD2IN50A reaches 35.0 ft-lb, or 420 in-lb, and the QC2P75 reaches 75 ft-lb. Cap either one at the ring limit.
Does Snap-on make this size for a Y body?
No. In Snap-on’s brochure the Y column starts at 14 mm, so the 9 mm size comes on the J shank only.
Does 9 mm match a standard ISO bolt?
No. ISO uses 8 mm for M5 and 10 mm for M6. So measure the part before you order the QJXM9A.
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