Description
Very large nuts with a light torque spec are awkward to measure. A big wrench reads poorly at the bottom of its scale, yet a small one cannot span the flats. The Snap-on QJO86ARTH open end head solves that mismatch. It puts a 2-11/16 in thin jaw on a small J-shank body.
QJO86ARTH specifications
| Opening | 2-11/16 in (about 68.3 mm) |
|---|---|
| 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) |
The only thin head this big
Snap-on’s thin inch heads stop well short of this size on the Y shank, since the largest Y version, the QYO72ARTH, opens to 2-1/4 in. On the J side, the next size down is the QJO68ARTH at 2-1/8 in. Nothing sits between 2-1/8 and 2-11/16 in. So if your nut measures 2-11/16 in, the QJO86ARTH is the one thin head in the table that fits.
Jobs that suit the Snap-on QJO86ARTH open end head
Large flats with a modest spec usually mean a locking or sealing nut rather than a structural one. For example:
- Lock nuts on large adjusting screws and tensioners.
- Packing gland and union nuts on big valves and pipe fittings.
- Jam nuts on hydraulic cylinder rods.
In each case, the thin jaw of the Snap-on QJO86ARTH open end head slides in beside a second nut or a housing. Meanwhile, the open end reaches the flats from the side, so you never need to strip the rod or pipe.
J-shank bodies for the QJO86ARTH
The head caps every job at 60 ft-lb, so choose a body around your spec:
- QD2IN100A dual-range: 16.6 to 71.9 ft-lb, so keep it at 60 or below.
- QD2IN50A dual-range: 9.2 to 35 ft-lb, for lighter specs.
- QC2I75 adjustable or QC2P75 preset: 5 to 75 ft-lb, under the same cap.
Because the head keeps the 2.50 in J spacing, the QD bodies need no length correction. However, Snap-on footnotes some open end heads for QC1P100 and QC1I200 bodies only. Ask Lost in HCM to confirm the body pairing for this size before you buy.
Care for a wide, thin jaw
A long thin jaw can spread if someone overloads it. Therefore, never take the QJO86ARTH past 60 ft-lb, and never use the head to free a seized nut. Also check that both jaw faces sit flat on the nut before you pull. Then store the head flat, so nothing bends the jaw tips.
Order the Snap-on QJO86ARTH open end head
Lost in HCM supplies this head and writes the quote, while SMK Vietnam lists it as a partner product. Tell them which J-shank body you use. Then request a QJO86ARTH quote from Lost in HCM. For matching bodies, see J-shank torque wrenches, while other sizes sit under torque wrench heads and adaptors. For anything else about the QJO86ARTH, contact SMK Vietnam.
QJO86ARTH buyer FAQ
Does Snap-on make a Y-shank thin head in 2-11/16 in?
No. The Y-shank thin inch heads end at 2-1/4 in, so this J-shank head is the only thin option at 2-11/16 in.
Will it fit a 68 mm nut?
Do not count on it. 2-11/16 in equals about 68.3 mm, so measure the nut and use a metric head for metric parts.
Is the QJO86ARTH a square drive head?
No. The partner title says square drive, but Snap-on lists it as a thin open end head.
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