Description
Snap-on makes two J-shank open end heads at 1-1/16 in, and both stop at 60 ft-lb. The Snap-on QJO34ARTH open end head is the thin one. So the choice between the pair comes down to the space around the nut, not to torque.
Thin QJO34ARTH or standard QJO34A
| Head | Jaw | Shank | Limit | Pin to fastener |
|---|---|---|---|---|
| QJO34ARTH | Thin | J (0.425 in) | 60 ft-lb | 2.50 in |
| QJO34A | Standard | J (0.425 in) | 60 ft-lb | 2.50 in |
| QYO34A | Standard | Y (0.560 in) | 160 ft-lb | 3.00 in |
| QXO34A | Standard | X (0.735 in) | 240 ft-lb | 4.50 in |
Both J heads share one spacing, so a body setting carries over between them. Pick the QJO34ARTH when a second nut, a flange or a bracket leaves only a narrow slot. Otherwise, the standard jaw suits open access. Note that Snap-on lists no thin Y head at this size.
Heavy hex nuts and the Snap-on QJO34ARTH open end head
Under ASME B18.2.2, a 5/8 in heavy hex nut measures 1-1/16 in across flats. Such nuts often hold flange and structural joints, where a lock nut may sit right behind them. In that spot, the thin jaw reaches the outer nut from the side. However, many 1-1/16 in nuts need far more than 60 ft-lb. So confirm the spec before you plan a J body for the job.
27 mm look-alikes
In metric terms, 1-1/16 in equals 26.99 mm. That is so close to 27 mm that crews often confuse the two. Still, use a metric head on metric nuts. For true 27 mm work, Snap-on lists the standard QJOM27A on a J shank, also with a 60 ft-lb limit. Keep the QJO34ARTH for inch hardware.
J bodies that pair with the QJO34ARTH
Light J bodies suit this head best. For example, the QD2IN100A reads 20-100 N·m, so cap it near 81 N·m while the head sits on it. The QC2P75 preset covers 5-75 ft-lb and suits one repeat value. Meanwhile, the CTECH1J240A ControlTech tops out at 20 ft-lb and keeps a digital record. CAT1500i also limits some open end heads to the QC1P100 and QC1I200 bodies in a footnote. Since the catalog text loses those marks, Lost in HCM confirms the right body.
Sourcing the Snap-on QJO34ARTH open end head in Vietnam
Lost in HCM supplies the Snap-on QJO34ARTH open end head and prepares the price, while SMK Vietnam shows it as a partner listing. First, note your J body model and the nut torque value. Next, request a quote from Lost in HCM for the head. Related parts sit in torque wrench heads and adaptors, and you can contact SMK Vietnam as well.
Thin 1-1/16 in head: what buyers ask
Does the thin jaw lower the QJO34ARTH limit?
No. CAT1500i gives the thin and the standard J heads the same 60 ft-lb limit, so the thin jaw buys access only.
Which thin heads sit next to the QJO34ARTH?
The QJO32ARTH at 1 in and the QJO36ARTH at 1-1/8 in, both J heads with a 60 ft-lb limit.
Can I free a seized nut with it?
No. Snap-on warns against breaking fasteners loose with its torque tools, so use a plain wrench for that step.
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