Description
Conveyor take-ups, bearing housings and cylinder mounts often use M18 bolts. At that size, the nut has a 27 mm hex in both ISO and DIN tables. The Snap-on QYOM27A open end head fits it from the side on a Y-shank (0.560 in) body. As a result, a mid-size wrench can torque M18 joints where a socket has no room.
Y bodies that stay under both Snap-on figures
Snap-on’s two catalogs print different maximum values for the QYOM27A, so this page names no single rating. Even so, three of the four Y bodies stay below the lower figure across their full scale.
| Y body | Scale | Safe at full scale? |
|---|---|---|
| CTECH2Y100A, electronic | 5-100 ft-lb | Yes |
| QD3IN200B, dual scale | 40-200 N·m (37-140 ft-lb) | Yes |
| QC3P150, preset | 30-150 ft-lb | Yes |
| QC3P200, preset | 40-200 ft-lb | No, cap it at 150 |
So only the QC3P200 needs a written cap with this jaw. For values above 150 ft-lb, ask Lost in HCM to confirm the head limit first.
M18 joints and the Snap-on QYOM27A open end head
Unlike M10, M12 or M14, the M18 nut has one hex size in both ISO 4032 and DIN 934. That makes the Snap-on QYOM27A open end head easy to plan across mixed fleets of machines. For example, a team can torque take-up bolts on a cement conveyor or mounts on a hydraulic cylinder with one kit. Long studs and rod ends are no problem, because the jaw never needs to pass over the bolt end.
Outer size and pin length on the QYOM27A
Both catalogs give this jaw a 55 mm outside diameter and a 12 mm depth. Its retaining pin sits 3.00 in from the fastener center, like every QYOM head. Snap-on says QD heads keep that length consistent, so the QD3IN200B needs no correction. For a preset or ControlTech body, however, check the method with Lost in HCM.
Next steps along the 27 mm row
Snap-on makes a 27 mm open end head for every shank. The QJOM27A suits light jobs, while the QXOM27A and the dual-pin QZOM27ADP take heavier loads than the QYOM27A. Therefore, pick the jaw by your body and the joint value, since the 27 mm opening stays the same.
Price request for the Snap-on QYOM27A open end head
SMK Vietnam lists this jaw, while Lost in HCM supplies it and quotes it. Please request a quote from Lost in HCM and mention your Y body plus the M18 target. Other heads sit under torque wrench heads and adaptors, and Y bodies under torque wrenches. For a body question, contact SMK Vietnam as well.
M18 buyers ask about the QYOM27A
Where do I get a confirmed limit for the QYOM27A?
Ask Lost in HCM when you request the quote. Until then, keep the setting at or under 150 ft-lb, which sits below both catalog figures.
Does an M18 nut always measure 27 mm?
In ISO 4032 and DIN 934, yes. Worn, painted or special nuts can differ, so check one with a caliper.
Will the QYOM27A fit a 1-1/16 in nut?
The sizes sit very close, at about 27.0 mm, yet an inch jaw gives the cleanest fit. Snap-on lists the QYO34A for 1-1/16 in on Y bodies.
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