Description
A 5/8 in tube nut that has seen years of service often has soft, rounded corners. A 12-point ring can slip on it, while a 6-point ring pushes on the middle of each flat. The Snap-on QJRXS20A flare nut head brings that grip to a light J-shank wrench. So it suits repair work on small inch lines where the nut must survive one more cycle.
Size and clearance of the QJRXS20A
| Opening | 5/8 in, 6-point, slotted |
|---|---|
| Shank | J (0.425 in) |
| Outside diameter | 1-3/32 in |
| Head depth | 7/16 in |
| Pin to fastener center | 2.50 in (QJRXS series) |
Snap-on’s US catalog, its UK brochure and the partner listing agree on these numbers. In practice, the head needs a little over 1/2 in of room from the nut center to a wall.
5/8 in or 16 mm?
A 5/8 in opening measures 15.88 mm, just under 16 mm. As a result, the QJRXS20A will not slide onto a true 16 mm nut. Likewise, a 16 mm head would sit loose on a 5/8 in nut. For metric lines, Snap-on lists the QJRXSM16A, a 16 mm 6-point J head, instead. Therefore measure the nut before you pick the part.
Snap-on QJRXS20A flare nut head against other 5/8 in options
- QJRXS20A: solid 6-point, J. Best grip on worn or painted nuts.
- QYRX20A: solid 12-point, Y, rated 79 ft-lb. Suits firmer specs.
- RTWH40JSL: ratcheting 12-point, J. Fastest on clean nuts that need many turns.
So pick the 6-point head when the nut condition matters most. However, step to the Y head when the line spec runs high.
Light J bodies for small lines
Small tube nuts often carry modest values, so a small body reads more finely. For example, the QD2IN50A covers 10-50 N·m with no length math at the 2.50 in spacing. The QC1P300 preset covers 60-300 in-lb for one repeated value. Meanwhile, the CTECH1J240A ControlTech body reads 1-20 ft-lb on a screen. Snap-on sources print different maximum ratings for the QJRXS20A, so Lost in HCM confirms the limit with your quote.
Caring for the 6-point flats
Look along the six flats under good light, since a burr can mark a brass nut. Then wipe off brake fluid or oil before you store the head. Also keep the Snap-on QJRXS20A flare nut head in a fitted tray, so heavier tools cannot nick the slot.
Quote route for the Snap-on QJRXS20A flare nut head
Lost in HCM, our partner, ships and prices the QJRXS20A, and SMK Vietnam only shows it here. Mention your J body and the fitting spec, and then ask Lost in HCM for QJRXS20A pricing. See related sizes in torque wrench heads and adaptors, or contact SMK Vietnam.
QJRXS20A fit questions
Will the QJRXS20A fit a 16 mm nut?
No. Its 5/8 in opening is about 0.12 mm smaller, so it will not go on. Use the QJRXSM16A.
Why choose 6 points for a small line nut?
Six points load the middle of each flat, so worn corners carry less force.
Is a Y version of the 5/8 in 6-point head available?
Yes, the QYRXS20A. Snap-on sources print different ratings for it, so confirm the figure with Lost in HCM.
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