Description
A 1-3/4 in nut often sits in a tight gap with a modest torque spec. The Snap-on QJO56ARTH open end head pairs that wide opening with a thin jaw and a light J shank (0.425 in). Snap-on rates it at 60 ft-lb, about 81 N·m, so it suits careful work rather than heavy clamping.
The QJO56ARTH in the thin head table
| Item | Value |
|---|---|
| Opening | 1-3/4 in (44.45 mm) |
| Shank | J (0.425 in) |
| Maximum working torque | 60 ft-lb (about 81 N·m) |
| Fastener center to retaining pin | 2.50 in |
| Catalog table | Thin Open End Heads, inches |
Snap-on lists the QJO56ARTH as a thin open end head, so it grips the nut directly and takes no socket. Also, J heads such as the QJXB box ends share the same 2.50 in spacing, so swaps keep one geometry.
Choosing between the QJO56ARTH and its Y twin
Snap-on also makes this opening as the QYO56ARTH on a Y shank (0.560 in). That twin carries 160 ft-lb and measures 3.00 in from pin to fastener center. Therefore, stay with the QJO56ARTH when your value stays at or under 60 ft-lb and you run J bodies. For anything higher, the Y head on a Y body is the safer route.
Check the nut before you order the Snap-on QJO56ARTH open end head
A 1-3/4 in opening equals 44.45 mm. So the jaw will not suit a 44 mm or 46 mm metric nut properly, and a loose fit can mark the corners. For a 46 mm nut, Snap-on lists the thin metric QJOM46ARTH instead. Also note the inch neighbors: QJO54ARTH at 1-11/16 in and QJO60ARTH at 1-7/8 in.
J bodies that suit a 60 ft-lb head
- QC2I75 adjustable, 5 to 75 ft-lb, so 60 ft-lb sits at 80% of its scale.
- QC2P75 preset, 5 to 75 ft-lb, for repeat jobs at one value.
- CTECH1J240A ControlTech, 1.0 to 20.0 ft-lb, for light values with a digital record.
Snap-on rates the QC series at ±4% clockwise and ±6% counterclockwise from 20 to 100% of full scale. However, a CAT1500i footnote limits some heads to the QC1P100 and QC1I200 bodies. So ask Lost in HCM to confirm your body with the QJO56ARTH before you order.
Where the Snap-on QJO56ARTH open end head helps
Think of a bearing lock nut on a machine spindle, or a large conduit locknut tight against a panel. A valve packing nut beside the yoke is another case. Each needs a measured, light torque in a narrow gap. So the thin QJO56ARTH slips in where a socket or a thick head will not.
Quote and supply for the 1-3/4 in QJO56ARTH
SMK Vietnam lists the head, and Lost in HCM supplies the QJO56ARTH and quotes it. Send your J body model and the target value. Next, request a QJO56ARTH quote from Lost in HCM with those details. J bodies appear in torque wrenches, while more heads sit in torque wrench heads and adaptors. Questions on fit can go to SMK Vietnam as well.
Three checks on the QJO56ARTH
What is the QJO56ARTH limit in N·m?
About 81 N·m, converted from Snap-on’s 60 ft-lb.
Does a 1-3/4 in jaw suit a 44 mm nut?
Not properly, since 1-3/4 in equals 44.45 mm. Measure the flats and choose a head that matches.
Which shank does the QJO56ARTH need?
A J shank (0.425 in). Match it to a J body, as Snap-on’s data sheet advises.
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