Description
The Snap-on QJSD8A fixed head is the smallest part in Snap-on’s fixed square drive chart. It puts a solid 1/4 in drive on a J-shank (0.425 in) torque wrench, with a 5/8 in outside diameter. That slim nose suits small sockets on crowded control panels, drive cabinets and electronics enclosures.
Fixed QJSD8A or a 1/4 in ratchet
| Head | Type | O.D. | Depth |
|---|---|---|---|
| QJSD8A | Fixed | 5/8 in | 3/4 in |
| QJD8A-72 | Ratcheting | 15/16 in | 7/16 in |
| QJD8SL-72 | Ratcheting, long | 15/16 in | 7/16 in |
So the fixed head is narrower but taller than either ratchet. Choose it when the socket must pass between close neighbors, such as a row of terminal screws. Choose a ratchet when the head must slip under a low cover, or when the swing arc is short.
In-lb bodies for the Snap-on QJSD8A fixed head
- QC1P60 preset: 10-60 in-lb.
- QC1P100 preset: 15-100 in-lb.
- QC1I200 adjustable: 40-200 in-lb.
- QC1P300 preset: 60-300 in-lb.
- CTECH1J240A ControlTech: 12-240 in-lb.
Preset bodies suit a station that runs one value all shift. Meanwhile, the QC1I200 and the ControlTech suit a tool crib that changes settings often. Every one of them uses the J shank, so the Snap-on QJSD8A fixed head drops straight in.
The rating question for the Snap-on QJSD8A fixed head
CAT1500i prints no working limit for its fixed heads. The older Snap-on UK Torque Brochure, however, lists 200 in-lb for the QJSD8A. Because the newer catalog does not repeat that figure, confirm it with Lost in HCM before you set a body above it. In practice, that value lines up with the top of the QC1I200 scale.
Sockets, bits and crowfoot work
Snap-on states that these heads let a body work with sockets, crowfoot wrenches and similar attachments. A straight extension on the QJSD8A adds no lever length, so the click still marks the set value. A crowfoot, on the other hand, moves the load away from the pin. In that case, ask Lost in HCM for Snap-on’s setting method before the first pull.
Sourcing a QJSD8A in Vietnam
SMK Vietnam lists the Snap-on QJSD8A fixed head for its partner, and Lost in HCM supplies it and writes the quote. Send your J body model and the socket sizes you run. After that, Lost in HCM will quote the QJSD8A. More drives sit in torque wrench heads and adaptors, and you can contact SMK Vietnam too.
QJSD8A size and fit questions
How wide is the QJSD8A nose?
5/8 in across, with a 3/4 in depth, according to CAT1500i.
Which fixed head comes next in size?
The QJSD12A, a 3/8 in J head with a 1 in outside diameter.
Does the QJSD8A fit a QC3P150?
No. The QC3P150 has a Y shank, and the QJSD8A needs a J body.
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