Description
A 29 mm hex rarely belongs to a standard nut, yet it turns up often on heavy hydraulic hardware. The Snap-on QZOM29ADP open end head lets a Z-shank (0.990 in) torque wrench reach that hex from the side. So you can tighten a fitting body or a special nut even when a hose or rod blocks a socket.
What the Snap-on QZOM29ADP open end head usually meets
Neither ISO 4032 nor DIN 934 uses 29 mm for a coarse-thread nut. M18 takes 27 mm, while M20 takes 30 mm. Therefore, a 29 mm hex usually sits on a fitting, an adapter, a valve body or a special lock nut. For example, picture a large swivel adapter at a press cylinder port. Before you order the QZOM29ADP, measure the flats with a caliper, because a sloppy jaw rounds hex corners.
QZOM29ADP data from two Snap-on sources
- Opening: 29 mm, dual retaining pins
- Shank: Z (0.990 in)
- Max working torque: 379 ft-lb, about 514 N·m
- Size: 58 mm across, 12 mm head depth
- Fastener center to retaining pin: 5.75 in
CAT1500i prints 379 ft-lb for this head. Snap-on’s UK torque brochure lists the 29 mm Z head as QZOM29A at 4,550 in-lb, which works out to the same value. Both sources also agree on the width and depth.
Snap-on QZOM29ADP open end head on the QD4IN800A
Snap-on’s industrial catalog shows one Z-shank body, the QD4IN800A. It reads 129 to 572 ft-lb, or 150 to 800 N·m, so 379 ft-lb falls well inside its scale. However, the wrench measures 41-1/2 in and weighs about 11 lb. As a result, plan for a two-hand pull and firm footing. Snap-on also says QD heads share a fixed pin-to-fastener sizing, so you need no length calculation. Still, never set the dial above 379 ft-lb with this jaw on the wrench.
Why not the X head at 29 mm?
Snap-on also makes 29 mm jaws on the Y and X shanks. Yet both sources give the Z version the highest limit at this size. So if your joint spec sits near the top of the X range, the Snap-on QZOM29ADP open end head leaves more margin. On the other hand, a lighter X or Y body is easier to carry along a line. In short, choose by the spec first and by the body you own second.
How the QZOM29ADP reaches your plant
SMK Vietnam lists this head for its partner, Lost in HCM, which handles supply and quotes. Request a quote from Lost in HCM for the QZOM29ADP and include the hex size, the joint spec and your body model. You can also browse torque wrench heads and adaptors or contact SMK Vietnam for help.
QZOM29ADP: three practical questions
Does a 29 mm head fit an M20 nut?
No. ISO 4032 and DIN 934 give M20 a 30 mm hex, so the QZOM29ADP would sit loose. Use the 30 mm Z head instead.
Can I loosen a stuck fitting with the QZOM29ADP?
No. Snap-on warns against using these torque wrenches to break fasteners loose. Free the part with a standard wrench first, then torque it with the QZOM29ADP.
Which wrench body does the QZOM29ADP need?
It needs a Z-shank (0.990 in) body. In CAT1500i that body is the QD4IN800A, which reads 129 to 572 ft-lb.
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