Description
A 55 mm nut usually sits on heavy plant, and you cannot always reach it from above. The Snap-on QZOM55A open end head slides onto the flats from the side instead. It then pins to a Z-shank torque body, so a large nut can still reach a controlled value.
Snap-on QZOM55A open end head basics
- Opening: 55 mm, open end.
- Shank: Z, which Snap-on sizes at 0.990 in.
- Bodies: Z-shank interchangeable torque wrenches.
QZOM55A or QZOM55ADP?
Snap-on’s CAT1500i shows two 55 mm open-end heads in its metric table. The QXOM55A uses an X shank and carries a 240 ft-lb rating. For Z bodies, the table shows the QZOM55ADP, a dual-pin version rated at 480 ft-lb. However, the QZOM55A itself does not appear in that table. So we do not quote a torque rating for it here. Ask Lost in HCM to confirm the rating and the pin style before you order.
When an open end beats a socket
An open-end head reaches nuts that a socket cannot cover. For example, a long stud or a pipe may run through the nut, or a guard may block the top. In those cases, the head enters from the side and grips two flats. However, two-flat contact carries more risk of slip than a box or socket. Keep the jaws square to the nut and pull smoothly, with no jerks.
Typical 55 mm work includes foundation nuts on presses and large pumps, as well as flange nuts on heavy gearboxes.
Pairing with a Z body
On SMK Vietnam, Z-shank choices include the QD4IN800A dual-scale body and the TECH4Z600, CTECH4Z600A and CTLNK4Z600 digital wrenches. Snap-on gives 5.75 in from fastener center to pin for its QZOM series. That matches its standard Z heads, which suits the dual-range bodies. Even so, confirm the length for this exact part with Lost in HCM.
Care for a large open-end head
Look for jaw spread after heavy use, because spread jaws grip only the corners. Also clean oil and paint flakes off the jaw faces. Then store the head in a dry rack, apart from smaller heads that could knock it.
Ordering the Snap-on QZOM55A open end head
Lost in HCM supplies this head and issues all quotes, while SMK Vietnam lists it. Please request a quote from Lost in HCM and state your Z-shank body and target torque. You can also browse torque wrench heads and adaptors or contact SMK Vietnam. Snap-on publishes its head range on snapon.com.
QZOM55A FAQ
What nut size does the QZOM55A fit?
It fits a 55 mm hex with an open-end jaw.
What is its torque rating?
Snap-on’s catalog table does not list the QZOM55A itself. Lost in HCM can confirm the rating in your quote.
Can it go on a Y or X body?
No. It has a Z shank. For X bodies, Snap-on lists the QXOM55A.
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