Description
Rail signalling depends on relays, terminals and trackside boxes that must stay tight through years of vibration. A single loose screw in a relay rack can cause a false signal or a long fault hunt. The Snap-on TQSS2FUAC torque driver helps signal maintainers prove that each screw sits at its set value. The tool is a short Torqometer with an inch-pound dial and a follow-up needle.
Signal cabinets and the Snap-on TQSS2FUAC torque driver
Vietnam’s metro lines and upgraded mainline routes add new interlocking rooms and trackside cabinets. Inside them, techs fit relay bases, cable glands, axle counter heads and lid hinges. Each screw has a value in the supplier’s manual. With this driver, the maintainer tightens, steps back and reads the held needle. As a result, the value goes onto the check sheet with no guesswork.
Base row: TQSS2FUA
| Item | TQSS2FUA |
|---|---|
| Model type | Stubby follow-up (2 needles) |
| Length | 5-1/4 in |
| Range | 384 in-oz / 24 in-lb |
| Increments | 8 in-oz / 1/2 in-lb |
| Full-length twin | TQS2FUA, 7-3/4 in |
| Case | PB47 storage case |
Snap-on prints this row in the U.S. driver table of catalog CAT1500i. The same table states that a C at the end of the stock number orders the version with a certificate of calibration. So the TQSS2FUAC is the C version of the TQSS2FUA. The partner listing adds the word chart, so check the paperwork line on your quote.
A short TQSS2FUAC body for crowded racks
Relay racks pack parts close together, and a long driver hits the next row. The 5-1/4 inch body keeps your hand near the work. Also, a short tool flexes less when you reach past cables. However, hold it square to the screw, since side load skews the reading.
Range and steps of the TQSS2FUAC
Snap-on promises 2% of reading from a fifth of full scale to full scale. Here, the promise starts at 4.8 in-lb. So the Snap-on TQSS2FUAC torque driver suits targets from there to 24 in-lb, about 2.7 N·m. In addition, the 1/2 in-lb steps let you see small changes as a terminal screw seats.
Ask for a Snap-on TQSS2FUAC torque driver quote
Your quote comes straight from Lost in HCM, the supplier. For a signal maintenance depot, request a quote from Lost in HCM. SMK Vietnam also lists other torque screwdrivers for wider ranges. See snapon.com for the maker, or contact SMK Vietnam.
TQSS2FUAC signal maintainer FAQ
Is the TQSS2FUAC safe on live signal circuits?
The listing gives no insulation rating. Isolate the circuit under your railway’s permit rules before you touch terminals.
Can one TQSS2FUAC cover a whole relay room?
It covers screws from about 5 to 24 in-lb. Lighter terminals need a smaller size, so check your manual values first.
What does the C in TQSS2FUAC add?
Snap-on’s catalog ties a trailing C to a certificate of calibration. Because the partner title also mentions a chart, ask Lost in HCM to list the documents.
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