Snap-on QJD12A-80 Ratcheting Head, 3/8″ Square Drive, J Shank, 2.50″ Pin to Fastener

Description

Assembly lines that run 3/8 in sockets on M8 and M10 hardware need a drive that fits the body they already own. The Snap-on QJD12A-80 ratcheting head adds that 3/8 in square drive to a J-shank (0.425 in) torque wrench. Its ratchet also runs nuts down in short swings, then the body clicks at the set value.

Standard length versus the SL head

The QJD12A-80 sits 2.50 in from the retaining pin to the fastener center. That matches the other QJD heads and most J heads. In contrast, the QJD12SL-80 stretches the spacing to 3.5 in for extra reach. Snap-on notes that its dual-range bodies use heads sized consistently from the pin, so no adjustment calculations are needed. Therefore the standard head is the simple choice when reach is not a problem.

Head data for the Snap-on QJD12A-80 ratcheting head

The same 3/8 in head comes in Y and X versions too, the QYD12A-80 and the QXD12A-80. So match the head to your body shank first.

J bodies to pair with the QJD12A-80

The QC1I200 reads 40-200 in-lb, which suits small screws and covers. Next, the QC2I75 adjustable and the QC2P75 preset both span 5-75 ft-lb. For metric drawings, the QD2IN100A reads 20-100 N·m. Because the sources disagree on this head’s limit, confirm it before you set any body near the top of its scale.

Sockets, crowfoots and the QJD12A-80

Snap-on designs these heads for sockets, crowfoot wrenches and similar attachments. A socket sits on the drive axis, so the reading stays true. However, a crowfoot moves the load further out, which raises the torque at the fastener. So calculate a corrected setting whenever a crowfoot goes on the QJD12A-80.

Lost in HCM supply of the Snap-on QJD12A-80 ratcheting head

SMK Vietnam shows the QJD12A-80 on behalf of Lost in HCM, the supplier that issues quotes. Share your J body model and the torque values, then request a quote from Lost in HCM. Other heads appear under torque wrench heads and adaptors, or contact SMK Vietnam.

QJD12A-80 points before you buy

Why does this page give no torque rating for the QJD12A-80?

The sources disagree, so this page states none. Ask Lost in HCM to confirm the current Snap-on rating before you set a body.

Which service kit rebuilds the QJD12A-80 ratchet?

CAT1500i lists the RKRF80 ratchet service kit for this head.

Can I use a crowfoot on the QJD12A-80?

Snap-on says these heads accept crowfoot wrenches. However, a crowfoot adds length, so work out the corrected setting first.