Description
Small tube nuts round off quickly when a plain open-end wrench slips. The Snap-on QYRX18A flare nut head gives a 9/16 in nut a wraparound grip on a torque wrench instead. It is the smallest size in Snap-on’s 12-point QYRX table, and it mounts on Y-shank bodies only.
QYRX18A in numbers
| Nut size | 9/16 in, 12-point slotted opening |
|---|---|
| Shank | Y (0.560 in) |
| Maximum recommended torque | 67 ft-lb (about 91 N·m) |
| Fastener center to retaining pin | 3.00 in (QYRX series) |
So this head carries the lowest rating in its series. The ratings then climb with each size, and from 1-1/16 in upward the QYRX heads reach 160 ft-lb.
Picking the Snap-on QYRX18A flare nut head over its neighbors
Measure the nut across the flats first. Then compare it with the nearest sizes in the same table:
- QYRX18A: 9/16 in, 67 ft-lb.
- QYRX20A: 5/8 in, 79 ft-lb.
- QYRX22A: 11/16 in, 92 ft-lb.
Snap-on builds every 12-point QYRX head on the Y shank. For a 9/16 in nut on a J body, the catalog offers the 6-point QJRXS18A instead, rated at 60 ft-lb. Meanwhile, the Y-shank 6-point QYRXS18A shares the 67 ft-lb limit of this head. As a rule, choose 12 points when the swing arc is short, and 6 points when the nut corners show wear.
Y-shank bodies for a 67 ft-lb head
The QYRX18A sets the ceiling, so pick a body whose range brackets your spec. The ControlTech CTECH2Y100A reads 5 to 100 ft-lb, which covers the full working band of this head. Likewise, the dual-range QD3IN200B starts at 37 ft-lb, so it suits specs from 37 to 67 ft-lb. A QC3P150 preset body also works for repeat jobs, as long as you keep its setting at 67 ft-lb or lower.
Because QYRX heads keep the 3.00 in Y spacing, the QD bodies need no length correction. ControlTech wrenches, on the other hand, store a head-length factor, so update it whenever you swap heads.
Typical 9/16 in jobs
- Small-bore hydraulic and pneumatic tube fittings on machine tools and presses.
- Brake and fuel line nuts in vehicle and forklift service bays.
- Pressure gauge lines on air compressors and hydraulic test benches.
In each case, the Snap-on QYRX18A flare nut head slips over the tube, so the line stays in place while you torque the nut.
Care and use of the QYRX18A
A slotted ring flexes more than a closed box, and the 9/16 in size has the least metal of the series. Therefore, stay under 67 ft-lb, and never use the head to crack a stuck nut. Also wipe oil off the jaws and check the slot for spread. Finally, keep the torque body on a regular recalibration plan.
Request a quote for the Snap-on QYRX18A flare nut head
Lost in HCM supplies this head and prepares every quote, while SMK Vietnam only lists it. Name your Y-shank body and the fitting spec in your message. Then request a QYRX18A quote from Lost in HCM. You can also browse related torque wrench heads and adaptors or contact SMK Vietnam with fit questions.
QYRX18A FAQ
Is there a J-shank 12-point head in 9/16 in?
No. Snap-on lists its 12-point QYRX heads with the Y shank only. For J bodies, look at the 6-point QJRXS18A.
How much torque can the QYRX18A take?
Snap-on gives 67 ft-lb, about 91 N·m, as the maximum recommended torque.
Which head is one size up?
The QYRX20A takes a 5/8 in nut and carries 79 ft-lb.
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