Description
Small fasteners call for a small drive, and the Snap-on QJD8A-72 ratcheting head brings 1/4 in sockets to a J-shank interchangeable torque wrench. It has the smallest square drive in Snap-on’s ratcheting head chart. So it pairs well with the low in-lb bodies that light assembly work needs.
Chart values for the 1/4 in QJD8A-72
| Item | Value |
|---|---|
| Square drive | 1/4 in |
| Shank | J (0.425 in) |
| Head O.D. | 15/16 in |
| Head depth | 7/16 in |
| Fastener center to retaining pin | 2.50 in (QJD series) |
| Ratchet service kit | Listed by Snap-on; confirm the number with Lost in HCM |
We could not confirm a maximum working torque for the QJD8A-72 in Snap-on’s current documents. So we do not quote one, and Lost in HCM can state the limit before you set a value.
Short QJD8A-72 versus long QJD8SL-72
Snap-on lists two 1/4 in J ratcheting heads with the same 15/16 in O.D. and 7/16 in depth. The difference is length. The QJD8A-72 belongs to the QJD series, with 2.50 in from the fastener center to the retaining pin. By contrast, the QJD-SL series measures 3.5 in, so the SL version reaches about 1 in farther. Choose the standard head when your setup assumes the shorter length, and check the wrench manual before you mix the two.
Ratchet or fixed for 1/4 in sockets
The fixed 1/4 in J head, QJSD8A, makes a useful comparison. Its chart row gives 5/8 in across and 3/4 in deep. So the fixed head is narrower, while the ratcheting QJD8A-72 is wider but sits lower above the fastener. Pick the ratchet for long rundowns on cover bolts, and pick the fixed head when side clearance is the tight dimension.
In-lb bodies for the Snap-on QJD8A-72 ratcheting head
A 1/4 in drive usually serves light values, so a light body makes sense. CAT1500i lists these J options, among others:
- QC1P60 preset, 10-60 in-lb.
- QC1P100 preset, 15-100 in-lb.
- QC1I200 adjustable, 40-200 in-lb.
- QC1P300 preset, 60-300 in-lb (6.8-33.9 N·m).
- CTECH1J240A ControlTech electronic, 12-240 in-lb.
Snap-on states QC series accuracy as +/-4% clockwise and +/-6% counterclockwise from 20 to 100% of full scale. Therefore, pick a body whose upper range sits near your target value for the QJD8A-72.
Care and ordering for the Snap-on QJD8A-72 ratcheting head
Keep the ratchet clean and dry, because grit can make a pawl slip under load. Also avoid breaking stuck bolts loose with a torque body, as Snap-on advises. When the head needs service, ask Lost in HCM for the matching kit.
SMK Vietnam lists the head, while Lost in HCM supplies it and issues the quote. Share your body model and socket sizes, then request a QJD8A-72 quote from Lost in HCM. See more torque wrench heads and adaptors, browse torque wrenches, or contact SMK Vietnam.
Buyer questions on the 1/4 in J ratchet head
What does the QJD8A-72 fit?
J-shank (0.425 in) interchangeable torque wrench bodies, such as the QC1 and QC2 series and the CTECH1J240A.
How does the SL version differ from the QJD8A-72?
The QJD8SL-72 shares the drive, O.D. and depth. However, its pin-to-fastener length is 3.5 in instead of 2.50 in.
Why does this page show no torque limit?
We could not confirm it in current Snap-on documents. Lost in HCM can state it in your quote.
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