Description
An M18 nut in a steel frame often needs more torque than a light wrench can give. The Snap-on QZOM27ADP open end head pairs a 27 mm jaw with the heavy Z shank (0.990 in) and dual retaining pins. As a result, it carries the highest rating Snap-on lists for a 27 mm open jaw.
Six numbers behind the QZOM27ADP
- Opening: 27 mm, dual pins
- Shank: Z (0.990 in)
- Maximum working torque: 319 ft-lb, about 433 N·m
- Width (O.D.): 55 mm
- Head depth: 12 mm
- Fastener center to retaining pin: 5.75 in
Snap-on’s CAT1500i catalog gives the QZOM27ADP 319 ft-lb. Meanwhile, the UK brochure lists the 27 mm Z head at 3,825 in-lb, which lands on the same figure.
M18 joints that call for the Snap-on QZOM27ADP open end head
ISO 4032 and DIN 934 both size the M18 nut at 27 mm across flats. So this jaw suits M18 nuts on long studs, such as tie rods on presses, anchor rods under machine bases and jam nuts on cylinder rod ends. In each case, a socket cannot slide over the thread. Also, check the nut height first, because the jaw stands 12 mm deep and needs full contact on the flats.
Weighing the Snap-on QZOM27ADP open end head against other shanks
The 27 mm row in CAT1500i also lists the QJOM27A, QYOM27A and QXOM27A. However, the J, Y and X limits differ between the two Snap-on publications. Only the Z figure lines up in both catalogs. Therefore, when a spec runs above 200 ft-lb, the QZOM27ADP gives you a value you can quote in a work instruction.
Handling the QD4IN800A with a 27 mm jaw
The Z body in CAT1500i is the QD4IN800A, the only wrench there that takes the QZOM27ADP. Expect a 41-1/2 in tube and roughly 11 lb of steel in your hands. So two hands and a stable stance help a lot. First, set the dial no higher than 319 ft-lb. Next, pull at a steady rate and stop at the click. Then log the value if your plant records torque. Keep in mind that the catalog rules out breaking fasteners loose with these bodies.
Quote and supply for the Snap-on QZOM27ADP open end head
Lost in HCM supplies this head, and SMK Vietnam lists it on its behalf. To get a price, request a quote from Lost in HCM with the quantity and your delivery site. For other jaws, see torque wrench heads and adaptors, or contact SMK Vietnam for advice.
QZOM27ADP FAQ for M18 work
Is the QZOM27ADP the right size for an M18 bolt head?
Yes, in most cases. ISO 4017 and DIN 931 bolts in M18 use a 27 mm hex. Still, measure painted or worn parts before you rely on it.
Is there a single-pin 27 mm Z head?
The UK brochure prints a QZOM27A, while CAT1500i shows only the dual-pin QZOM27ADP. Ask Lost in HCM which version matches your body.
Does the QZOM27ADP work for light M18 specs?
Not on the QD4IN800A, because that scale starts at 129 ft-lb. For lighter M18 specs, use a Y or X body with a matching 27 mm head.
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