Description
At 1-3/4 in, Snap-on makes the same thin open jaw on two shanks, and the choice changes the torque you can apply. The Snap-on QYO56ARTH open end head is the Y-shank (0.560 in) version. It carries a 160 ft-lb rating, while the J-shank QJO56ARTH stops at 60 ft-lb. So the shank you pick decides which joints the head can finish.
J twin and Y head side by side
| Item | QJO56ARTH | QYO56ARTH |
|---|---|---|
| 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 |
| Pin to fastener center | 2.50 in | 3.00 in |
| Example bodies | QC2I75, QD2IN100A | QD3IN200B, QC3P200 |
As a result, the J head suits light specs on compact bodies, while the Y head takes the firm ones. The longer Y reach, however, needs a little more room behind the nut.
When the Snap-on QYO56ARTH open end head is the right buy
- The spec is above 60 ft-lb, so only the Y head can carry it at this size.
- Your plant already runs Y bodies, such as a QD3IN200B or a QC3P150 preset.
- The nut sits in a slot or behind a flange, where a socket or box end cannot reach.
- The joint repeats on a line, which suits a locked preset body.
Y body settings for the Snap-on QYO56ARTH open end head
Most Y bodies stop below this head rating. For example, the QD3IN200B reads to 140 ft-lb and the QC3P150 to 150 ft-lb, so the body becomes the limit. The QC3P200 runs to 200 ft-lb, though. Therefore cap its preset at 160 ft-lb whenever the Snap-on QYO56ARTH open end head is fitted. A ControlTech CTECH2Y100A, by contrast, tops out at 100 ft-lb and suits the lighter end.
Neighbors at 1-5/8 and 1-7/8 in
The QYO52ARTH covers 1-5/8 in and the QYO60ARTH covers 1-7/8 in, both at 160 ft-lb. So three Y thin heads, with the Snap-on QYO56ARTH open end head in the middle, span the large sizes around 1-3/4 in. Also keep in mind that 1-3/4 in equals 44.45 mm. Check a metric nut on the jaw before you assume a fit.
How to price the QYO56ARTH
SMK Vietnam lists the QYO56ARTH for Lost in HCM, which supplies it and quotes the price. Share the joint spec and the Y body you use, and Lost in HCM will match the head. To begin, request a quote from Lost in HCM on its product page. Other sizes sit in torque wrench heads and adaptors, or you can contact SMK Vietnam.
Questions on the 1-3/4 in thin Y jaw
Why does the J version stop at 60 ft-lb?
Snap-on prints 60 ft-lb for every J thin head in its inch table, whatever the size. For specs above that, the Y head is the catalog option.
Will the QYO56ARTH lock into a QC2I75?
No. The QC2I75 has a J shank, so it takes the QJO56ARTH instead.
Which body reads N·m directly with this head?
The QD3IN200B, with a 40 to 200 N·m scale. Its whole range sits under the head rating, so no setting can overload the jaw.
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