Description
Home appliance plants in Vietnam build washing machines, fans, rice cookers and water heaters for local shops and export. Inside each unit, for example, motor brackets, terminal blocks and heater clamps hold with screws in the tens of inch-pounds. The Snap-on TQS4A torque driver lets a line auditor read those values on a 50 in-lb dial instead of trusting a power tool’s setting.
A square drive inside the handle
Snap-on marks the TQS4A with a note in catalog CAT1500i: it includes a 1/4 inch internal square drive in the handle. So the driver can take a square-drive bit holder or a small socket adaptor. That gives the auditor more ways to reach a screw head, from a deep motor bracket to a flat terminal cover.
Four codes in the TQS4 row
| Code | Body | Dial | Length |
|---|---|---|---|
| TQS4A | Standard | Basic, one needle | 8-11/16 in |
| TQS4FUA | Standard | Follow-up, two needles | 8-11/16 in |
| TQSS4A | Stubby | Basic, one needle | 5-1/4 in |
| TQSS4FUA | Stubby | Follow-up, two needles | 5-1/4 in |
Also, all four read to 50 in-lb in 1 in-lb steps, per page 336 of CAT1500i. The Snap-on TQS4A torque driver is the standard basic choice, so it suits open benches where the longer grip helps on repeat checks.
Appliance joints in the 10 to 50 in-lb zone
- Motor mounting screws on fan and blender bases.
- Terminal block screws on heater and thermostat circuits.
- Pump and valve bracket screws inside washing machines.
- Hinge and lid screws on rice cookers and kettles.
Each brand sets its own values, however. Therefore read the work instruction, and favor the upper part of the TQS4A scale for the best reading.
Caring for the Snap-on TQS4A torque driver
First, return the driver to its PB47 case at shift end. Also keep it away from grease and solder splash, and wipe the dial lens with a dry cloth. Snap-on warns not to use these tools to break fasteners loose or to exceed rated torque. In the end, accuracy depends on regular checks, so book periodic recalibration at an outside lab.
Where to buy the Snap-on TQS4A torque driver
Lost in HCM, the partner behind this SMK Vietnam page, supplies the driver to appliance and electronics plants. Send your line count when you request a quote from Lost in HCM. The catalog notes that drivers in the chart come without a certificate of calibration, while a C suffix orders one. Compare other torque screwdrivers, check snapon.com, or contact SMK Vietnam.
Questions from appliance auditors
What does 50 in-lb equal in N·m?
About 5.6 N·m. Since many appliance drawings print N·m, convert the value before the audit.
Should I choose the TQS4A or the TQSS4A?
Choose the TQS4A for open benches and a longer grip. By contrast, the 5-1/4 inch TQSS4A reaches screws inside tight housings.
Which size comes next above the TQS4A?
The TQS6A reads to 75 in-lb in 1 in-lb steps, with the same 8-11/16 inch length. It suits heavier bracket screws.
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