Description
A 1-3/8 in nut is large, yet many of them only need a light, careful torque. Jam nuts, packing nuts and adjusters are good examples. The Snap-on QJO66ARTH open end head fits that kind of job. Its thin 2-1/16 in jaw slides onto the nut from the side, while a small J-shank body measures the torque.
What Snap-on lists for the QJO66ARTH
| Opening | 2-1/16 in (about 52.4 mm) |
|---|---|
| Head style | Thin open end, inch |
| Shank | J (0.425 in) |
| Maximum working torque | 60 ft-lb (about 81 N·m) |
| Fastener center to retaining pin | 2.50 in (QJO series) |
Between 2 in and 2-1/8 in
In Snap-on’s thin inch table, the QJO64ARTH opens to 2 in and the QJO68ARTH to 2-1/8 in. The QJO66ARTH fills the 1/16 in step between them. That matters, because a loose jaw on a large nut tends to slip and round the corners. So measure the flats with a caliper first, then choose the exact head.
Snap-on QJO66ARTH open end head or a heavier X-shank head?
The thin Y-shank heads include 2 in and 2-1/8 in sizes, but not 2-1/16 in. As a result, the QJO66ARTH is the only thin head at this opening. If your spec runs above 60 ft-lb, look at the standard QXO66A instead. It lists 240 ft-lb on an X shank, although it is not part of the thin range. Therefore, choose between clearance and capacity before you order.
J bodies that suit a 60 ft-lb cap
- QD2IN100A: 16.6 to 71.9 ft-lb, so stop at 60 with this head.
- QC2I75 adjustable: 5 to 75 ft-lb.
- QC2P75 preset: 5 to 75 ft-lb, set once for a repeat job.
The QD bodies use heads sized from pin to fastener center, so no length calculation applies. Even so, a catalog footnote limits certain open end heads to the QC1P100 and QC1I200 bodies. Ask Lost in HCM to confirm the pairing for the QJO66ARTH.
Typical 1-3/8 in nut jobs
ASME finished hex nuts for 1-3/8 in threads measure 2-1/16 in across flats. You meet them on lock nuts for large adjusting screws, gland nuts on pumps and valves, and jam nuts on cylinder rods. In each case, the thin jaw of the QJO66ARTH fits beside a second nut or a housing face.
Pricing and supply for the Snap-on QJO66ARTH open end head
SMK Vietnam lists this head, and Lost in HCM supplies it with a quote. Mention your J-shank body and the torque value you set. Then request a QJO66ARTH quote from Lost in HCM. Matching bodies sit under torque wrenches, and other heads under torque wrench heads and adaptors. Questions on fit can go straight to SMK Vietnam’s contact page.
QJO66ARTH: what buyers ask
Which nut does a 2-1/16 in opening fit?
It fits ASME finished hex nuts for 1-3/8 in threads. A 52 mm metric nut is close but not the same, so use a metric head there.
Is there a Y-shank thin head at this size?
No. Snap-on’s thin Y heads skip 2-1/16 in, so this J head is the thin option.
Can I go past 60 ft-lb on a bigger body?
No. The head limit applies on every body, so set the wrench at or below 60 ft-lb.
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