Description
Newer Japanese and Korean machines in Vietnamese FDI plants mostly follow ISO hardware. Under ISO 4017 and ISO 4032, an M14 bolt or nut carries a 21 mm hex. The Snap-on QYXM21A box end head fits that size with a closed 12-point ring on the Y shank (0.560 in). As a result, a mid-size body can handle M14 frames, mounts and housings.
Stepping up from the J ring at 21 mm
Snap-on’s UK brochure lists 21 mm rings for the J, Y and X shanks. It caps the J version, the QJXM21A, at 900 in-lb, or 75 ft-lb. So once an M14 spec climbs past that point, a J ring is out of its depth. The QYXM21A is the next step up, and it locks into the common 23 in Y bodies.
Logging M14 pulls with the Snap-on QYXM21A box end head
Many FDI customers ask suppliers for a record of every critical joint. For that job, pair the ring with the CTECH2Y100A, a Y-shank ControlTech body that reads 5 to 100 ft-lb. It stores 1,500 readings, and it offers 50 presets with a batch count of 99. In addition, a calibration due indicator warns the user when the wrench needs its next check. If the spec runs higher, the QD3IN200B dial body reaches 140 ft-lb.
Fit check for the QYXM21A: 31 mm wide, 13 mm deep
The ring measures 31 mm across, so it needs about 15.5 mm from the bolt center to a wall. Its 13 mm depth slips under most covers and guard lips. Also, the bolt sits 3.00 in from the retaining pin, which keeps the swing arc short.
About the QYXM21A working limit
We found two published working limits for this ring, and they do not match. So this page leaves the figure out. Lost in HCM confirms the right value with your quote, and every setting should stay at or below it.
Getting the Snap-on QYXM21A box end head for your line
Lost in HCM supplies the QYXM21A, while SMK Vietnam lists it as a partner product. Give them the Y body, the M14 value and the quantity per line. Then request a quote from Lost in HCM. Neighboring sizes sit under torque wrench heads and adaptors, and SMK Vietnam can answer fit questions.
ISO M14 buyer questions about the QYXM21A
Can a DIN-pattern M14 nut take a 21 mm ring?
No. DIN gives M14 a 22 mm hex, so that nut needs a 22 mm ring such as the QYXM22A.
When is the J ring at 21 mm enough?
When the M14 value stays at or below 900 in-lb, the brochure rating for the QJXM21A.
Does a QC3P150 preset accept this head?
Yes. It is a Y body with a 30-150 ft-lb range, built for one fixed value per station.
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