Description
A loose terminal screw in a control panel can run hot for months before anyone notices. Panel builders and switchgear makers in Vietnam therefore check terminal torque as part of final test. The Snap-on TQS4FUAC torque driver gives their testers a dial reading for that job. It is a U.S.-reading Torqometer driver with a follow-up needle, and Lost in HCM lists it with a chart.
Terminal checks with the Snap-on TQS4FUAC torque driver
Breakers, contactors and terminal blocks each carry a torque value on their data sheet. During final test, the inspector turns sample screws to that value and reads the dial. Because the second needle stays at the peak, the reading waits while the inspector lifts the driver clear of the panel. Then the value goes onto the panel’s test sheet, screw by screw.
What Snap-on lists for the TQS4FUA
| Item | TQS4FUA |
|---|---|
| Scale | U.S. reading, 50 in-lb full scale |
| Increments | 1 in-lb |
| Length | 8-11/16 in (standard body) |
| Drive | 1/4 in internal square drive in handle |
| Case | PB47 storage case |
These figures come from the U.S. torque driver table in Snap-on’s CAT1500i catalog. The same table says a C at the end of the stock number orders the version with a certificate of calibration. So the TQS4FUAC is the C form of the TQS4FUA.
The square drive in the handle
Snap-on marks the 4 and 6 sizes as having a 1/4-inch internal square drive in the handle. In practice, that lets you fit a bit holder or a small socket adapter. As a result, one driver can reach slotted, Phillips and hex heads on the same panel. However, keep the adapter short, since a long, flexing stack makes the reading less steady.
Sizing the TQS4FUAC for your screws
Snap-on rates the standard grade within 2% of reading from 20% of full scale to full scale. On a 50 in-lb dial, that band starts at 10 in-lb. So the Snap-on TQS4FUAC torque driver suits targets from there up to about 50 in-lb, or roughly 5.6 N·m. For lighter screws, the TQS2.5FUA or TQS2FUA reads finer. Meanwhile, the TQS6FUA covers values up to 75 in-lb.
Habits that keep test data clean
Zero the follow-up needle before each screw. Also hold the driver in line with the screw, and push only as hard as the bit needs. Swap worn bits early, because cam-out spoils the peak. Finally, keep the driver in its PB47 case and send it for calibration on your plant’s cycle.
Buy the Snap-on TQS4FUAC torque driver
Lost in HCM supplies this driver, and SMK Vietnam lists it for them. To price a set for your test bay, request a quote from Lost in HCM. You can also browse torque screwdrivers, check snapon.com, or contact SMK Vietnam.
Panel shop questions
Is the TQS4FUAC insulated for live work?
No insulation rating appears in the listing. Treat it as a standard tool and test only on panels that are isolated and locked out.
Does the dial show newton meters?
No, it reads in inch-pounds only. For an N·m spec, divide by about 0.113 to get the in-lb target.
What is the chart in the title?
The source does not explain it. Ask Lost in HCM what documents ship with the C version.
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