Description
M6 is everywhere on electrical cabinets, sensor brackets and machine covers. Its standard hex measures 10 mm, and the Snap-on QJXM10A box end head grips that size with a closed 12-point ring. The ring sits on the compact J shank (0.425 in), so it suits small, light bodies.
What the brochure says about the QJXM10A
Snap-on’s UK torque brochure rates this ring at 630 in-lb, which is about 52.5 ft-lb or 71 N·m. The partner listing gives the same figure in rounded form. The ring measures 15 mm across and 7 mm deep. In addition, the J series puts the fastener center 2.50 in from the retaining pin. At 10 mm, Snap-on offers this ring on the J shank only.
The head is rarely the limit on M6
Most M6 specs sit far below 630 in-lb. So the real question is which J body reads your value inside its accurate band. Snap-on states accuracy from 20 to 100% of full scale, which gives these working bands:
| J body | Range | Accurate from |
|---|---|---|
| CTECH1J240A | 12-240 in-lb | about 48 in-lb |
| QC1P300 preset | 60-300 in-lb | 60 in-lb |
| QC1I200 adjustable | 40-200 in-lb | 40 in-lb |
| QD2IN50A | 10-50 N·m | 10 N·m |
All four stay below the ring rating at full scale. By contrast, the QD2IN100A and the QC2 bodies reach 75 ft-lb or 100 N·m. Those can pass 630 in-lb, so cap the setting if you fit the QJXM10A to them.
Using the Snap-on QJXM10A box end head on small hardware
The 15 mm ring needs only about 7.5 mm from the bolt center to a wall. Therefore it slides between terminal rows and close cover bolts where a socket stack would not fit. Seat the ring fully, then pull slowly, because a short J body reaches its value fast. Also keep a separate wrench for loosening, since Snap-on warns against breaking fasteners loose with these heads.
Where SMK buyers get the Snap-on QJXM10A box end head
SMK Vietnam lists this ring for Lost in HCM, which supplies it and quotes each order. List your J body, the M6 value and how many stations need the head. Then request a quote from Lost in HCM. Other small rings sit under torque wrench heads and adaptors, or contact SMK Vietnam.
Short answers for M6 stations using the QJXM10A
Is 10 mm the right ring for M6 bolts?
Yes, for standard hex parts. ISO 4017, ISO 4032 and DIN 934 all give M6 a 10 mm hex.
Which J bodies can go past 630 in-lb?
The QD2IN100A, QC2P75 and QC2I75 can. So cap their setting at the ring rating.
Does Snap-on make a 10 mm ring for a Y body?
No. The brochure shows the 10 mm ring on the J shank only.
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