Description
The Snap-on QZSD24ADP fixed head gives a Z-shank interchangeable torque wrench a solid 3/4 in square drive with no ratchet inside. It uses the dual-pin Z fitting, so it belongs on Snap-on’s heaviest interchangeable bodies. Heavy equipment and plant maintenance crews use this class of head for large frame, flange and mounting bolts.
Drive size check: 3/4 in, not 1 in
Some listings, including the partner page title, describe this part as a 1 in head. However, Snap-on’s CAT1500i chart places the QZSD24ADP in the 3/4 in row. The 1 in Z fixed head is the QZSD32ADP. The Lost in HCM spec table also gives 3/4 in. So order 3/4 in drive sockets for this head.
QZSD24ADP dimensions compared
| Model | Drive | Head O.D. | Head depth |
|---|---|---|---|
| QZSD24ADP (fixed) | 3/4 in | 1-1/2 in | 2 in |
| QZSD32ADP (fixed) | 1 in | 1-3/4 in | 2-1/4 in |
| QZD24BDP (ratcheting) | 3/4 in | 2-1/2 in | 1-1/4 in |
This comparison shows a clear trade-off. The fixed QZSD24ADP is 1 in narrower than the 3/4 in ratcheting head, yet it stands 3/4 in taller. So choose the fixed head for narrow gaps between bolts, and the ratchet when height above the bolt is the limit.
Z bodies and the dual-pin note
Snap-on’s dual-range chart lists one Z body, the QD4IN800A, with a 150-800 N·m (129-572 ft-lb) range. The same chart carries the note “For use with dual pin heads only”. Snap-on’s ControlTech CTECH4Z600A also takes Z heads and spans 30-600 ft-lb. The catalog does not tie every body to every head. So ask Lost in HCM to confirm the pairing for your wrench and the QZSD24ADP.
Rating and length of the Snap-on QZSD24ADP fixed head
We found no maximum working torque for the QZSD24ADP in Snap-on’s current charts. The UK brochure rates a single-pin QZSD24A, but that is a different part number. So we quote neither a limit nor a pin-to-fastener length here. Lost in HCM can confirm both before you set the body.
A fixed drive has no pawl to wear, so it suits the final pull on large bolts with deep sockets or extensions. For example, track frames, slew rings and pump bases often need a rigid link at high values. Run the nut down with a ratchet or impact tool first, then make the final pull with the QZSD24ADP.
Order the Snap-on QZSD24ADP fixed head
SMK Vietnam lists the head, and Lost in HCM supplies it with a formal quote. Send your Z body model, socket drive and torque values. With those details, send a QZSD24ADP request to Lost in HCM. You can also see other torque wrench heads and adaptors, review torque wrenches, or contact SMK Vietnam.
Common questions about the 3/4 in Z fixed head
Is the QZSD24ADP a 1 in or a 3/4 in head?
Snap-on’s chart lists it as 3/4 in. The 1 in dual-pin Z fixed head is the QZSD32ADP.
What does the fixed design save over a ratchet?
There is no ratchet to service, and the head O.D. is only 1-1/2 in against 2-1/2 in for the QZD24BDP.
Which body should carry the QZSD24ADP?
A Z-shank body. Snap-on lists the QD4IN800A and the CTECH4Z600A, so confirm the dual-pin fit with Lost in HCM.
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