Description
Metric line work on Japanese, Korean and European machines often comes down to small hex sizes and very little room. The Snap-on QJRXSM15A flare nut head handles a 15 mm tube nut with a slotted 6-point ring. It also fits J-shank (0.425 in) bodies, the lightest shank in the range. So you can torque a line nut with a compact wrench, even inside a crowded panel.
Ring size in millimeters
Both Snap-on sources agree on the size of the Snap-on QJRXSM15A flare nut head: 26 mm outside diameter and 10 mm deep. That leaves about 5.5 mm of wall on each side of the 15 mm hex. In practice, the head clears a neighbor fitting or bracket that sits at least 13 mm from the nut center. Also, the head sits 2.50 in, or 63.5 mm, from the retaining pin to the fastener center, like other QJRXSM heads.
Two Snap-on figures for one 15 mm J head
CAT1500i and the UK Torque Brochure print different maximum working torque values for this J head. Because the gap matters on a small body, this page does not pick one. So ask Lost in HCM to confirm the current Snap-on figure with your quote. Meanwhile, the Y-shank twin, the QYRXSM15A, carries matching ratings in both books, so it suits joints that need more headroom.
Choosing a J wrench body for the Snap-on QJRXSM15A flare nut head
- QD2IN50A: 10-50 N·m, read straight from the metric scale.
- QD2IN100A: 20-100 N·m, for firmer metric specs once the head figure is confirmed.
- QC2I75 adjustable: 5-75 ft-lb, set on a micrometer-style scale.
- CTECH1J240A ControlTech: 12-240 in-lb, for light nuts, with a time-stamped data trail.
Since metric drawings use N·m, the two QD bodies save a conversion step. In addition, the QD tubes expect the standard pin spacing, so no length math is needed.
Where the Snap-on QJRXSM15A flare nut head meets 15 mm nuts
Some metric tube fittings and brake unions use a 15 mm hex, though 14, 16 and 17 mm are common too. So measure each nut with a caliper before you build a kit around the Snap-on QJRXSM15A flare nut head. For a mixed manifold, Snap-on offers J heads at 14 and 16 mm on either side of this size. The slotted ring then lets one technician work every line without unhooking it, which saves time on a busy shift.
Buying the QJRXSM15A: what Lost in HCM needs
SMK Vietnam lists the QJRXSM15A for Lost in HCM, which supplies the head and prepares the price. Mention your J body model and the joint spec in N·m. Then request a quote from Lost in HCM, and ask them to confirm the head rating. Other heads sit under torque wrench heads and adaptors, or you can contact SMK Vietnam.
15 mm J flare head FAQ
What is the outside diameter of the 15 mm J ring?
It measures 26 mm, with a 10 mm head depth. Both figures match in CAT1500i and the UK brochure.
Should I choose the J or the Y version at 15 mm?
First, pick the J head for a light body and a tight space. Choose the QYRXSM15A on a Y body when the joint needs a firmer value, since both Snap-on books agree on its rating.
Will it lock into a J body with an ft-lb scale?
Yes. The shank decides the fit, not the scale units. So a QC2I75 in ft-lb takes it just like a QD2IN50A in N·m.
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