Description
Big metric line fittings on hydraulic power units can call for more torque than a light head allows. The Snap-on QYRXSM20A flare nut head answers that with a Y shank and a 113 ft-lb rating, about 153 N·m. Its slotted 6-point ring still passes over the tube, so you torque the nut in place.
Snap-on QYRXSM20A flare nut head specifications
| Size | 20 mm, 6-point |
|---|---|
| Shank | Y (0.560 in) |
| Maximum working torque | 113 ft-lb (about 153 N·m) |
| O.D. | 33 mm |
| Head depth | 13 mm |
| Fastener center to retaining pin | 3.00 in (QYRXSM series) |
Snap-on’s US catalog and UK torque brochure agree on these figures. The UK sheet gives the limit as 1,350 in-lb, which matches 113 ft-lb.
How the Y ratings climb near 20 mm
On the Y shank, Snap-on raises the limit with the nut size. For example, the 19 mm QYRXSM19A carries 104 ft-lb, while the 20 mm head reaches 113. Above it, the 21 mm QYRXSM21A shares the 1,350 in-lb figure in the UK brochure. So the QYRXSM20A sits near the top of the Y metric range.
J or Y at 20 mm
A J-shank twin, the QJRXSM20A, also exists. However, Snap-on’s documents do not give it a single agreed limit. Elsewhere in the US catalog, the J metric flare heads top out at 60 ft-lb. Therefore, choose the Snap-on QYRXSM20A flare nut head whenever your spec runs above light duty. The trade-off is length, since the Y series measures 3.00 in from pin to fastener against 2.50 in for J.
Y bodies that cover 113 ft-lb
- QD3IN200B dual-range: 40 to 200 N·m (37 to 140 ft-lb), so it covers the full head rating.
- QC3P150 preset: 30 to 150 ft-lb, set once for a repeat joint.
- CTECH2Y100A ControlTech: 5 to 100 ft-lb, so it stops short of the head limit.
Pick the body that places your spec in the upper part of its scale. Then never set any of them above 113 ft-lb with the QYRXSM20A fitted.
Care and safe use of the Snap-on QYRXSM20A flare nut head
A slot weakens the ring, and 113 ft-lb loads it hard. So seat the head fully on the flats before you pull. Keep the wrench square to the line, and stop at the click. Never use the head to break a seized fitting loose. Also recalibrate the body on a regular schedule.
Pricing the QYRXSM20A through Lost in HCM
Lost in HCM supplies the head and quotes it, and SMK Vietnam lists it. Send your Y body model and the fitting torque. Then request a QYRXSM20A quote from Lost in HCM. Y bodies are under torque wrenches, and other heads under torque wrench heads and adaptors. Or simply contact SMK Vietnam for help.
QYRXSM20A questions
How much clearance does the 20 mm head need?
Snap-on lists a 33 mm O.D. and a 13 mm head depth.
Is 113 ft-lb safe on a QC3P200 body?
Yes, as long as you set it at or below 113 ft-lb. The body runs to 200 ft-lb, but the head sets the cap.
Which head sits one size down?
The 19 mm QYRXSM19A, rated at 104 ft-lb.
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