Description
Snap-on makes its 1-7/8 in thin open end in two shank sizes. The Snap-on QJO60ARTH open end head is the J-shank version, so it pairs with light, short wrench bodies. That suits jam nuts and adjusters, where the nut is big but the torque stays modest.
QJO60ARTH or QYO60ARTH?
| QJO60ARTH | QYO60ARTH | |
|---|---|---|
| Opening | 1-7/8 in | 1-7/8 in |
| Shank | J (0.425 in) | Y (0.560 in) |
| Maximum working torque | 60 ft-lb (about 81 N·m) | 160 ft-lb (about 217 N·m) |
| Fastener center to retaining pin | 2.50 in | 3.00 in |
Pick the QJO60ARTH when your spec stays at or under 60 ft-lb and you already run J bodies. However, choose the Y twin when the value climbs higher, because the J head cannot take it.
The nut behind a 1-7/8 in opening
ASME finished hex nuts and jam nuts for 1-1/4 in threads measure 1-7/8 in across flats. By contrast, heavy hex nuts for the same thread run 2 in, so they need the QJO64ARTH. Metric nuts near this size do not match either. For a 46 mm nut, Snap-on lists the thin metric QJOM46ARTH. As a result, a quick caliper check before you order the QJO60ARTH saves a wrong part.
Typical jobs for the Snap-on QJO60ARTH open end head
- Jam nuts on large adjusting screws and tie rods.
- Lock nuts on cylinder rod ends, set against a clevis.
- Packing and gland nuts on pumps and valves.
In each case, a second nut or a housing face leaves little room. So the thin jaw of the QJO60ARTH slides in where a thick wrench cannot.
J bodies to pair with the 1-7/8 in head
Snap-on’s dual-range QD2IN100A covers 20 to 100 N·m, which is 16.6 to 71.9 ft-lb. So stop at 60 ft-lb with this head on. The QC2I75 adjustable and QC2P75 preset bodies both run 5 to 75 ft-lb. Meanwhile, a catalog footnote limits some open end heads to the QC1P100 and QC1I200 bodies. Ask Lost in HCM to confirm the pairing for your Snap-on QJO60ARTH open end head.
Keeping the Snap-on QJO60ARTH open end head accurate
Push the QJO60ARTH fully onto the flats before you pull, since a shallow grip loads only the tips. Also hold the wrench square to the nut. Do not crack a tight nut free with it, either. In addition, recalibrate the body on a regular schedule, as Snap-on advises.
Price and supply via Lost in HCM
Lost in HCM supplies the QJO60ARTH and quotes it, while SMK Vietnam lists it. Share your J-shank body and the torque you need. Then request a QJO60ARTH quote from Lost in HCM. You will find J bodies in torque wrenches and spare heads in torque wrench heads and adaptors. Send fit questions to SMK Vietnam as well.
QJO60ARTH quick answers
Does the QJO60ARTH fit a heavy hex nut for a 1-1/4 in bolt?
No. Heavy hex nuts for that thread measure 2 in, so use the QJO64ARTH.
What if my spec is 100 ft-lb?
Use the Y-shank QYO60ARTH, which Snap-on rates at 160 ft-lb, on a Y body.
Is the 1-7/8 in head part of the thin range?
Yes. Snap-on lists the QJO60ARTH in its thin open end heads, inches table.
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