Description
DIN 933 and DIN 934 give M12 bolts a 19 mm hex, while ISO uses 18 mm. Many European machines still carry the DIN size. The Snap-on QXXM19A box end head fits it on the strong X shank. Unlike several of its neighbors, this ring has a rating that both of our sources agree on.
A printed limit you can work to
Snap-on’s UK brochure rates the QXXM19A at 2,860 in-lb. That equals about 238 ft-lb, or 323 N·m, and the partner listing also gives 238 ft-lb. So you can plan settings against a firm ceiling. The ring measures 28 mm across and 12 mm deep, with 4.50 in from pin to fastener center.
X bodies and the 238 ft-lb ceiling
| Body | Range | Can it pass 238 ft-lb? |
|---|---|---|
| QD3IN350A | 59-251 ft-lb (70-350 N·m) | Yes, near the top |
| QC4P300 | 60-300 ft-lb, preset | Yes |
| CTECH3X250A | 12.5-250 ft-lb, digital | Yes, near the top |
Each of these X bodies reaches past the head rating. Therefore, treat 238 ft-lb as the real cap whenever the Snap-on QXXM19A box end head is on the wrench. For example, never lock a QC4P300 preset above that figure.
Why a 19 mm ring on an X body
High-strength M12 bolts on press frames, gear housings and lifting points can carry firm specs. J bodies top out near 75 ft-lb, so they fall short where the QXXM19A works. Snap-on also offers the 19 mm ring on the Y shank as the QYXM19A. Choose the X version when the value sits above your Y body or when an X wrench already lives at the station.
Room around the Snap-on QXXM19A box end head
The ring needs about 14 mm from the bolt center to a wall. In addition, X bodies run from 23 to 27 in long, so plan the swing before the job. Then seat the QXXM19A fully and pull smoothly to the click.
Quote path for the Snap-on QXXM19A box end head
Lost in HCM supplies the QXXM19A and sets the price, while SMK Vietnam lists it as a partner product. Name your X body and the M12 target in the request. Then request a quote from Lost in HCM. Other sizes appear in torque wrench heads and adaptors, and you can contact SMK Vietnam at any time.
Questions on the 19 mm X ring
What is the QXXM19A torque rating?
Snap-on lists 2,860 in-lb, which is about 238 ft-lb or 323 N·m.
Does the 19 mm ring fit ISO M12 bolts?
No. ISO M12 uses 18 mm, so order an 18 mm ring such as the QXXM18A.
Can a QD3IN350A over-torque this head?
Yes, if you set it above 238 ft-lb. Keep the setting at or below the rating.
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