Snap-on QJOM25A Open End Head, 25 mm, J Shank (0.425″), 52 mm Wide

Description

Few tool boards hold a 25 mm spanner, since no common metric nut uses that size. Yet 25 mm flats keep turning up on port plugs, adapters and sensor housings. The Snap-on QJOM25A open end head gives those parts a measured torque on a J-shank (0.425 in) body. Because the jaw goes on from the side, a connected line can stay in place.

Where a 25 mm hex comes from

ISO 4032 and DIN 934 jump from 24 mm on M16 to 27 mm on M18. So a 25 mm hex almost never belongs to a plain nut. Instead, it tends to sit on a fitting body, a pressure switch, a temperature probe or a drain plug. For that reason, check the part with a caliper before you order the Snap-on QJOM25A open end head.

Pre-order checks for the Snap-on QJOM25A open end head

• Flats: confirm 25 mm across, not 24 or 26.
• Hex land: the head stands 11 mm deep, so the flats need enough height to carry it.
• Swing room: the head spans 52 mm, and a nearby pipe can block it.
• Body: your wrench needs a J shank (0.425 in).
• Spec: note the joint value in ft-lb or N·m for the quote.

Both Snap-on sources print the same width and depth for the QJOM25A. Also, its pin sits 2.50 in from the fastener center, like the rest of the QJOM series.

A body that stays under the QJOM25A limit

Snap-on’s catalog and its UK brochure print different maximum working torques for this jaw, so we leave both out. Even so, one body sidesteps the question for light work. The QD2IN50A reads 10 to 50 N·m, or 9.2 to 35.0 ft-lb, and its full scale sits under either printed value. For specs above 35 ft-lb, the QD2IN100A or the QC2I75 reaches further. In that case, ask Lost in HCM to confirm the head limit first.

A coolant line job for the QJOM25A

Picture a coolant manifold on a CNC machine, where a 25 mm adapter sits between two hoses. A socket cannot reach it unless you drain the line. With the QJOM25A on a short J body, a technician tightens it in place and stops at the click. Then the same light kit moves on to the next machine. Wipe the flats dry first, though, because coolant makes a jaw slip.

Getting the Snap-on QJOM25A open end head quoted

The QJOM25A comes from Lost in HCM, which also writes the quote, while SMK Vietnam lists it here. Request a quote from Lost in HCM with your J body model and the joint value. For nearby sizes, browse torque wrench heads and adaptors, or contact SMK Vietnam.

25 mm J jaw: quick answers on the QJOM25A

Will the QJOM25A fit an M16 nut?

No. M16 nuts use a 24 mm hex in ISO 4032 and DIN 934, so the 25 mm jaw would sit loose and round the corners.

Which Snap-on heads share the 25 mm size?

CAT1500i lists the QYOM25A, the QXOM25A and the QZOM25ADP. Each one needs a body with its own shank, so the QJOM25A stays the light J option.

Can I loosen a seized plug with the QJOM25A?

Please don’t. Snap-on warns against breaking fasteners loose with its torque bodies, so free the plug with a plain wrench first.