Description
A -8 JIC swivel nut, used on 1/2 in tube, commonly has a 7/8 in hex. When that nut is brass or aluminum, or the spec is light, a big Y wrench is more tool than the job needs. The Snap-on QJRXS28A flare nut head puts a 7/8 in, 6-point slotted ring on the J shank instead. So a short, light body can finish the joint.
Snap-on QJRXS28A flare nut head dimensions
| Opening | 7/8 in, 6-point, slotted |
|---|---|
| Shank | J (0.425 in) |
| Outside diameter | 1-13/32 in |
| Head depth | 9/16 in |
| Pin to fastener center | 2.50 in (QJRXS series) |
CAT1500i, the UK brochure and the partner listing agree on those numbers. Half the outside diameter is about 0.70 in, so plan that much room around the center of the QJRXS28A.
When to move up to the Y twin
Snap-on also makes this ring for Y bodies, as the QYRXS28A, rated 133 ft-lb in both its catalog and its brochure. The 12-point QYRX28A carries the same 133 ft-lb on a Y shank. By contrast, the two sources print different limits for the J head, so Lost in HCM confirms that figure. In any case, J bodies top out near 75 ft-lb. Therefore steel fittings with firm specs belong on the Y versions, not on the QJRXS28A.
Pairing the QJRXS28A with a J body
- QC2I75: adjustable J body, 5 to 75 ft-lb.
- QD2IN100A: dual N·m and ft-lb scale, 20 to 100 N·m, set directly at the 2.50 in spacing.
- CTECH1J240A ControlTech, 1-20 ft-lb, for soft fittings with very low values.
Choose the body whose range puts your spec near its middle. Then cap the setting at the head limit from your quote.
22 mm nuts and the 7/8 in ring
A 7/8 in opening measures 22.23 mm, so it sits 0.23 mm loose on a 22 mm nut. On a soft metric fitting, that play can round the corners. Snap-on’s metric 6-point flare table stops at 21 mm, so it offers no exact 22 mm match. In that case, ask Lost in HCM about another metric option rather than forcing the Snap-on QJRXS28A flare nut head onto the nut.
Slot and flat care for the Snap-on QJRXS28A flare nut head
Check the slot edges against a straight edge each month, because a spread slot loses grip. Then inspect the six flats for burrs that could mark brass. Also clean off oil before you store the Snap-on QJRXS28A flare nut head.
Quote request for the QJRXS28A
Lost in HCM supplies the QJRXS28A and prepares the price, and SMK Vietnam shows it as a partner listing. State your J body and the fitting spec. Next, use the QJRXS28A quote page at Lost in HCM to send the request. Related sizes sit under torque wrench heads and adaptors, or you can contact SMK Vietnam.
QJRXS28A: points to confirm
Will a -8 JIC swivel nut take the QJRXS28A?
In most cases, yes, since that nut usually has a 7/8 in hex. Measure it first.
What rating does the Y version carry?
The QYRXS28A carries 133 ft-lb in both Snap-on sources.
Is there a ratcheting 7/8 in J head?
Yes, the RTWH56JSL. It ratchets, but it sits farther from the pin, so setup takes more care.
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