Description
ISO 4032 and DIN 934 agree on one thing at M18: the hex is 27 mm across flats. So unlike several metric sizes, 27 mm brings no standards trap. The Snap-on QXXM27A box end head wraps that hex in a closed 12-point ring on the X shank (0.735 in). It suits mid-to-heavy M18 work where a Z body would be too long to swing.
How big is the QXXM27A ring?
Snap-on’s UK torque brochure gives this ring a 39 mm outside diameter and a 17 mm head depth. The fastener center sits 4.50 in from the retaining pin, as on every QXXM head. With a 39 mm ring, plan about 19.5 mm from the bolt center to the nearest wall. The partner listing shows the same width and depth.
Working limit for the QXXM27A
Our two sources disagree on the maximum working torque of this ring, so no figure appears here. Lost in HCM confirms the limit when it quotes. Until then, keep settings within your joint spec, and never use the head to break a fastener loose.
X or Z for an M18 joint
| Body | Shank | Range | Length |
|---|---|---|---|
| QD3IN350A | X | 59-251 ft-lb | 23 in |
| QC4P300 | X | 60-300 ft-lb, preset | 27 in |
| CTECH3X250A | X | 12.5-250 ft-lb | 24.1 in |
| QD4IN800A | Z | 129-572 ft-lb | 41-1/2 in |
The X bodies stay between 23 and 27 in long, while the Z body passes 41 in. So the Snap-on QXXM27A box end head fits frames and machine bays where a long handle would hit a column. On the other hand, Snap-on also makes a Z-shank 27 mm ring for the heaviest M18 specs. Choose by the joint value first, then by the room you have to swing.
Typical M18 work for the Snap-on QXXM27A box end head
M18 hardware often holds motor bases, hoist brackets, press frames and heavy conveyor drives. For instance, a crew re-torquing a gearbox mount can reach the bolt from the side with the ring. Meanwhile, the 17 mm depth keeps the head low under a guard rail. In each case, check the hex with a caliper, because flanged or coated heads can differ.
Getting the Snap-on QXXM27A box end head quoted
SMK Vietnam lists the QXXM27A for Lost in HCM, which supplies it and prices each order. Share your X body, the M18 torque value and the number of stations. Then request a quote from Lost in HCM. Other sizes sit in torque wrench heads and adaptors, or contact SMK Vietnam for help.
Common M18 fit questions on the QXXM27A
Do ISO and DIN M18 parts both take this 27 mm ring?
Yes. Both standards give M18 a 27 mm hex across flats.
Can a CTECH3X250A record each M18 pull?
Yes. It is an X-shank ControlTech body with a time-stamped data trail, and it reads 12.5 to 250 ft-lb.
Why does this page show no torque rating?
Our sources list different figures. Lost in HCM confirms the correct limit with your quote.
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