Description
Six millimeters is where the Snap-on metric open end table begins, and the Snap-on QJOM6A open end head is its first entry. It gives a J-shank torque body a 6 mm jaw for tiny hex parts, so you can set a light, repeatable torque from the side. Instrument fittings, miniature sensor nuts and small adjusters are typical work for it.
QJOM6A data from two Snap-on sources
- Opening: 6 mm, open end.
- Shank: J (0.425 in), with 2.50 in from fastener center to retaining pin.
- Maximum recommended working torque: 5 ft-lb, which equals 60 in-lb.
- Shank options at 6 mm: J only.
CAT1500i and the UK torque brochure agree on the 5 ft-lb limit. However, they print slightly different width and depth figures, so we leave those out.
A 60 in-lb ceiling changes the body choice
Most J bodies read in ft-lb, and their lower range sits close to this head’s whole limit. So the UK brochure restricts the QJOM6A to two in-lb bodies, the QC1P100 and the QC1I200. The QC1P100 presets from 15 to 100 in-lb. By contrast, the QC1I200 adjusts from 40 to 200 in-lb. Snap-on quotes QC accuracy from 20 to 100% of full scale. As a result, the QC1I200 suits targets from 40 up to 60 in-lb, while the QC1P100 also covers lower values from 20 in-lb.
Small joints that suit the Snap-on QJOM6A open end head
ISO 4032 gives the M3.5 nut a 6 mm hex, although M3.5 is a rare size. Therefore the 6 mm jaw mostly meets fittings and special parts rather than standard bolts. For example, a capillary fitting on a gauge, a nut on a miniature valve or a lock nut on a fine adjuster may use it. These parts often sit beside tubing, so a socket cannot drop over them. The Snap-on QJOM6A open end head reaches them from the side instead. Also, soft brass threads strip quickly, and a known limit protects them.
When 7 mm, 8 mm or a socket fits better
Measure the hex with a caliper first, because 6 mm and 1/4 in sit close together. If the part is 7 mm, the QJOM7A takes over at 6 ft-lb. At 8 mm, the QJOM8A carries 10 ft-lb. However, any joint above 60 in-lb needs a different tool than the QJOM6A. In that case, a 1/4 in square drive head such as the QJD8A-72 lets a J body turn a socket.
Care for a 6 mm jaw
Tiny jaws round off corners when they tilt, so seat the QJOM6A flat and square. Then pull slowly until the body clicks. Afterward, wipe the shank and keep the head in a labeled tray.
Where to get the Snap-on QJOM6A open end head
SMK Vietnam lists the QJOM6A as a partner product, and Lost in HCM handles supply and pricing. Request a quote from Lost in HCM and say whether you run a QC1P100 or a QC1I200 body. For other small jaws, browse torque wrench heads and adaptors, or contact SMK Vietnam with your fastener list.
QJOM6A questions from instrument shops
Why not use a ft-lb body with the QJOM6A?
The head tops out at 60 in-lb. Snap-on therefore lists only the in-lb QC1P100 and QC1I200 bodies for it.
What is the lowest target I can set with the QJOM6A?
On a QC1P100, about 20 in-lb, since Snap-on quotes accuracy from 20% of full scale. Below that, ask Lost in HCM about a lighter tool.
Is the QJOM6A the smallest metric open end head?
Yes, in CAT1500i. The metric open end table starts at 6 mm with this part.
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