Description
Breakers, contactors and terminal blocks often carry a screw torque on their label, and many of those values are printed in pound-inches. Yet the screws sit between DIN rails and wire ducts, with little room for a long tool. The Snap-on TQSS2A torque driver fits that gap. It is a stubby Torqometer driver with a 24 in-lb U.S. basic dial.
Panel shop uses for the Snap-on TQSS2A torque driver
Loose terminals heat up, while crushed ones cut strands. Therefore control panel and switchgear builders in Binh Duong and Dong Nai check terminal torque during build and final test. Typical TQSS2A jobs include:
- Terminal screws on relays, contactors and motor protection devices.
- Device and DIN rail end stop screws.
- Busbar comb and earth bar screws on small panels, when the label gives a value in range.
- Cover screws on junction boxes and sensor heads.
The device label or datasheet always wins, so read it before each new part number. Also, Snap-on does not describe this driver as insulated, so isolate the panel before you work on it.
Numbers behind the TQSS2A
| Detail | Snap-on data |
|---|---|
| Range | 384 in-oz / 24 in-lb (about 2.7 N·m) |
| Increments | 8 in-oz / 1/2 in-lb |
| Length | 5-1/4 in, stubby |
| Dial | U.S. reading, basic, one needle |
| Case | PB47 |
The 2% guarantee runs from 20% of full scale to the top. In practice, that gives a working band of about 4.8 to 24 in-lb.
Stubby TQSS2A versus the standard TQS2A
Both models share the 24 in-lb scale and the same steps. However, the TQS2A runs 7-3/4 inches, so it gives a bigger grip on bench work. The TQSS2A trades that grip for reach in deep enclosures. Meanwhile, the TQSS2FUA keeps the stubby length and adds a peak pointer for final inspection.
Care in a dusty panel shop
Copper dust and wire strands collect on any tool left near a stripping bench. So wipe the TQSS2A after each shift and store it in its PB47 case. Next, avoid using it as a pry or a hammer, since a knock can shift the zero. Finally, send it for a check on the interval your QA plan sets.
TQSS2A questions from panel builders
Will the Snap-on TQSS2A torque driver fit metric terminal values?
Yes, if you convert first. For example, 2.5 N·m is about 22 in-lb, which sits inside the TQSS2A scale.
Should we buy the TQSS2A or a click-type screwdriver?
A dial shows the actual value, so it suits setup and audit work. In contrast, a click tool suits fast repeat tightening.
Does the TQSS2A hold the highest reading?
No. The basic dial tracks live torque only, so pick the TQSS2FUA if you need a held peak.
Ordering for your panel line
Lost in HCM supplies the TQSS2A and prepares the quote for each order. To start, request a quote from Lost in HCM. In addition, you can compare other torque screwdrivers, check snapon.com for maker data, or contact SMK Vietnam.
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