Description
Snap-on’s metric flare nut limits climb by about 8 ft-lb per millimeter at the small end of the chart. The Snap-on QJRXSM12A flare nut head sits at 12 mm, with a 50 ft-lb limit. It slips a slotted 6-point ring over the line and onto the nut, then reads torque through a J-shank body.
Two catalogs, one rating for the QJRXSM12A
In CAT1500i, the 12 mm row of the QJRXSM12A shows a 50 ft-lb ceiling. The UK Torque Brochure gives 600 in-lb, and 600 divided by 12 also comes to 50 ft-lb. So the figure holds across both sources, at roughly 67.8 N·m. Both also agree on the 22 mm outer diameter and the 9 mm head depth.
The 12 mm row beside its neighbors
| Head | Size | Limit | O.D. | Depth |
|---|---|---|---|---|
| QJRXSM11A | 11 mm | 42 ft-lb | 21 mm | 9 mm |
| QJRXSM12A | 12 mm | 50 ft-lb | 22 mm | 9 mm |
| QJRXSM13A | 13 mm | 58 ft-lb | 24 mm | 9 mm |
All three share a 9 mm depth, so the slot clears the same tight spots. However, the 12 mm head has no Y-shank twin in either catalog. Hence a shop with only Y bodies needs a J body for this size.
J bodies for the Snap-on QJRXSM12A flare nut head
The QC2I75 reads 5-75 ft-lb, so its upper third stays off limits with this head. Similarly, the QD2IN100A covers 20-100 N·m; stop it at about 67 N·m. For light fittings, the CTECH1J240A runs 1.4-27.2 N·m and logs each reading. In every case, the head sets the ceiling, not the body.
Tube nuts and the QJRXSM12A slot
Hydraulic, fuel and gauge lines on many metric machines end in small tube nuts. An open end wrench rides on two corners and can round a soft fitting. The 6-point ring of the Snap-on QJRXSM12A flare nut head bears on the flats instead. First, pass the slot over the tube. Next, lower the ring onto the nut and pull smoothly to the signal. Snap-on warns against using its torque bodies to break fasteners loose, so free a stuck nut with a line wrench first.
How Lost in HCM supplies the Snap-on QJRXSM12A flare nut head
SMK Vietnam shows this head as a partner listing, while Lost in HCM supplies it and sends the quote. List your J body and the torque value of each 12 mm fitting. After that, open a quote for the 12 mm head with Lost in HCM. More heads sit under torque wrench heads and adaptors, or you can contact SMK Vietnam.
12 mm flare head: short answers
What if my 12 mm tube nut calls for 60 ft-lb?
The QJRXSM12A stops at 50 ft-lb, so recheck the spec or ask Lost in HCM about another tool.
Could a Y-shank body run a 12 mm flare head?
Not with a Snap-on head. Neither CAT1500i nor the UK brochure lists a Y version at 12 mm.
How wide is the QJRXSM12A around the nut?
Its O.D. is 22 mm, and the head depth is 9 mm.
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