Description
On ISO hardware, 18 mm is the hex size of an M12 bolt, a workhorse on machine frames and drives. The Snap-on QYXM18A box end head fits that size with a 12-point ring on a Y shank. It suits bolts with open space above them but no room for a socket stack.
The QYXM18A in numbers
- Opening: 18 mm, 12-point.
- Shank: Y (0.560 in).
- Outside diameter: 27 mm; head depth: 12 mm.
- Fastener center to retaining pin: 3.00 in.
Four ways to reach an 18 mm bolt
Snap-on offers several Y-shank heads at this size, so pick the shape that suits the access.
| Head | Style |
|---|---|
| QYXM18A | 12-point box end |
| QYXBM18A | 12-point box end, 10° offset |
| QYSBXM18A | 12-point box end, 40° bend |
| QYBOERM18A | Ratcheting 12-point box end |
Pick the Snap-on QYXM18A box end head when you can reach the bolt square-on. Choose the offset or bent head when a rim or a flange blocks the handle. Then use the ratcheting head when the nut needs many turns.
Matching a Y body
Every Y-shank body takes the QYXM18A, so start with the torque you need. The QD3IN200B covers 37-140 ft-lb, while the QC3P150 and QC3P200 presets suit one repeated value. For a stored record, the CTLNK2Y100 ControlTech Link wrench keeps a time-stamped data trail. Snap-on sources show different ratings for the head, so ask Lost in HCM to confirm the limit first.
Plant jobs for the Snap-on QYXM18A box end head
- Gearbox and motor mounts on conveyors and mixers.
- Frame and rail bolts on machine bases.
- Pump and fan housings where a socket hits the casing.
DIN-pattern M12 bolts use 19 mm instead, so measure before you order.
Looking after the head
Clean the QYXM18A ring after oily work, because a slick ring can ride up the corners. Also check the shank and pin hole for play. Then store the head with its siblings in a labeled tray.
Get a quote for the Snap-on QYXM18A box end head
SMK Vietnam lists the Snap-on QYXM18A box end head, and Lost in HCM supplies it and quotes it. Include your body model and the bolt spec in the request. Next, request a quote from Lost in HCM. For offset and ratcheting 18 mm heads, see our torque wrench heads and adaptors or ask SMK Vietnam.
Your QYXM18A questions answered
Should I buy the QYXM18A or the offset QYXBM18A?
Both take a Y body and fit an 18 mm hex. Choose the QYXBM18A when its 10° offset helps the handle clear an obstacle.
Which bolt does an 18 mm ring fit?
ISO M12 hex bolts use 18 mm across flats. DIN-pattern M12 bolts use 19 mm, so measure first.
Is there a J-shank 18 mm version?
Yes. Snap-on lists the QJXM18A for lighter J bodies.
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