Snap-on QJO38ARTH Open End Head, 1-3/16″ Thin Jaw, J Shank (0.425″), 60 ft-lb Max

Description

At 1-3/16 in, Snap-on’s thin open end range offers just one head. The Snap-on QJO38ARTH open end head is that part, with a thin jaw on a J shank (0.425 in) and a 60 ft-lb rating. It slips beside a second nut or a flange, where a socket or a thick head will not fit.

QJO38ARTH dimensions and limit

Its neighbors in the J thin table are the QJO36ARTH at 1-1/8 in and the QJO40ARTH at 1-1/4 in. Because those steps are only 1/16 in, measure the flats with a caliper first.

30 mm nuts and the Snap-on QJO38ARTH open end head

A 1-3/16 in jaw equals 30.16 mm, so it sits just 0.16 mm loose on a 30 mm nut. Even so, a soft or plated nut can lose its corners under that play. For true 30 mm nuts, Snap-on’s metric open end table lists the QJOM30 on a J shank, also at 60 ft-lb.

Where the Snap-on QJO38ARTH open end head fits

The 1-3/16 in size rarely appears on standard bolts. Instead, it turns up on some pipe unions, gland nuts and threaded sensor bodies. For example, a lock nut that holds a sensor in a panel often sits tight against the sheet. The thin QJO38ARTH reaches it from the side, and the J body stops at a measured value.

J bodies that suit the QJO38ARTH

• QD2IN50A dual scale, 10-50 N·m (9.2-35.0 ft-lb), for light gland nuts.
• QC2I75 adjustable, 5-75 ft-lb, capped at 60 ft-lb with this head.
• CTECH1J240A ControlTech, 1-20 ft-lb, with a digital record.

CAT1500i also adds a footnote that limits certain open end heads to the QC1P100 and QC1I200 bodies. Since the marks do not survive in the text we checked, Lost in HCM confirms the right body for the QJO38ARTH.

Thin jaw or the QYRX38A ring

For a tube nut at 1-3/16 in, Snap-on’s 12-point QYRX38A wraps the hex, but it needs a Y body. The Snap-on QJO38ARTH open end head grips only two flats, yet it reaches nuts that a ring cannot pass over. So choose the ring for tube nuts and the thin jaw for jam nuts and tight gaps.

Quote route for the QJO38ARTH

Lost in HCM supplies the QJO38ARTH and prepares the quote, while SMK Vietnam shows it as a partner listing. Give the team your J body and the joint value. Then request a quote from Lost in HCM for this head. Other sizes sit under torque wrench heads and adaptors, and you can also contact SMK Vietnam.

QJO38ARTH quick checks

Is there a Y-shank 1-3/16 in thin head?

Not in CAT1500i. Its Y thin inch heads start at larger sizes, so the QJO38ARTH is the thin option here.

Should I use the QJO38ARTH on a 30 mm nut?

Better not. Choose the QJOM30, which Snap-on sizes for 30 mm flats.

Why does the QJO38ARTH listing mention a square drive?

The partner title uses that wording. Snap-on, however, lists it as a thin open end head that grips the nut directly.