U.S. Basic Torque Driver (with Chart) – TQS1AC

The dial torque driver TQS1AC belongs to the Snap-on Torqometer® US reading dial torque drivers range, and Lost in HCM supplies it to workshops and factories across Vietnam. Snap-on lists the country of origin as USA. The storage case is PB47.

Dial torque driver TQS1AC overview

The dial torque driver TQS1AC shows torque on a dial as you turn, so you see the value build live. It holds ±2% of reading from 20% of full scale to full scale. Also, that accuracy applies in both clockwise and counterclockwise directions.

Snap-on builds this Torqometer® family in the USA for small fasteners and fine settings. Ranges run from 8 in-oz up to 75 in-lb, and many dials read in-oz and in-lb together. Meanwhile, each tool ships in a PB47 storage case and follows ASME B107.14.

The asme®/ansi® is B107.14.2004. The model is Standard Basic. The dial is US Reading.

The length is 7-3/4 inches. The increments is 4 in-oz/1/4 in-lb. The range is 192 in-oz/12 in-lb.

Specifications at a glance

The table below follows the Snap-on data for TQS1AC. In addition, we converted imperial torque values to N·m where Snap-on lists none.

How the dial torque driver works

The Basic dial shows torque only while you hold the load. By contrast, the Follow-up dial has a second pointer that the main needle pushes ahead of it. So when you let go, the second pointer stays at the highest value you reached.

That peak memory helps with audit checks and breakaway tests. For example, an inspector turns a tightened screw until it moves, then reads the held value. Afterward, you reset the follow pointer to zero before the next reading, as the manual shows.

Key features of the dial torque driver TQS1AC

Every driver in this family shares the same core design, from the dial to the ±2% guarantee. Here are the features that matter most when you compare models and ranges.

• Guaranteed ±2% of reading. Snap-on guarantees accuracy within ±2% of the reading from 20% of full scale to full scale. Because the tolerance follows the reading, small values stay accurate across the whole working band.
• Reads in both directions. The stated accuracy applies in both the clockwise and counterclockwise directions. Therefore, one driver can tighten left-hand screws and measure breakaway torque on a joint that is already tight.
• Basic or Follow-up dial. Basic models show live torque only while you turn. Follow-up models add a pointer that holds the peak, so you can read it after you let go.
• From 8 in-oz to 75 in-lb. The family starts at 8 in-oz for tiny screws and tops out at 75 in-lb. In short, one series covers electronics work through light assembly and small machine screws.
• Fine dial increments. Low-range dials step in 1/4 or 1/2 in-oz, while the largest models step in 1 in-lb. Many dials also carry both in-oz and in-lb scales, so you can read either unit.
• Stubby and standard lengths. Stubby drivers measure 5-1/4 inches for tight spaces inside housings and panels. Meanwhile, standard drivers run 7-3/4 or 8-11/16 inches, which gives a fuller grip on higher settings.

Snap-on data sheet notes

Snap-on also lists these details for TQS1AC:

• Guaranteed Accuracy: Within ± 2% of the reading from 20% of full scale to full scale clockwise and counterclockwise.

Typical applications

A dial torque driver earns its place where you must see the value, not just feel a click. The tasks below are the most common uses we see from buyers.

• Electronics and PCB assembly. Circuit boards, connectors, and small terminals use tiny screws with low torque limits. A low-range dial driver shows the value as it builds, so operators stop before a thread strips.
• Audit and breakaway checks. Quality inspectors often check torque on screws that are already tight. For example, a Follow-up driver holds the breakaway peak, so the inspector reads and records it after the screw moves.
• Medical and precision devices. Small housings and instrument parts need repeatable torque on fine threads. Because the dial reads in both directions, the same driver can tighten and verify each joint during the same build.
• Small motors and sensors. Motor end caps, sensor mounts, and encoder screws need tight control at low values. In addition, the in-oz scale gives fine steps that a larger click tool cannot match.
• Optics and camera mounts. Lens mounts and optical brackets shift when screws get too much torque. Therefore, technicians use a stubby dial driver to reach inside tight frames and stop right at the target.
• Tool room and process setup. Engineers use dial drivers to find the right torque for a new joint during setup. Then they set preset production tools to that value and confirm it on the line.

Industries that use the dial torque driver TQS1AC

Dial torque drivers matter wherever small screws must hold a known value. The industries below use them on lines and in quality labs. Many of these teams also work in FDI plants across Vietnam's northern and southern industrial parks.

• Electronics manufacturing. Electronics plants in Bac Ninh, Bac Giang, and Thai Nguyen build phones, boards, and modules with tiny screws. So low-range dial drivers help these FDI lines hold torque values that customers write into their specs.
• Medical device production. Medical device makers must prove that every small fastener meets its stated torque. For this reason, plants in Vietnam's export zones use dial drivers to measure and record values during build and audit.
• Aerospace components. Aircraft parts and avionics boxes use inch fasteners with strict torque limits from US design data. Therefore, suppliers in Vietnam use US reading dial drivers that match the units printed on their drawings.
• Automotive electronics. Sensors, control units, and wiring modules need careful torque on small screws and terminals. Meanwhile, FDI auto parts suppliers in Hai Phong and Dong Nai use dial drivers for both assembly and audit checks.
• Precision instruments. Makers of meters, valves, and optical gear tighten fine threads that strip with little force. In addition, a dial reading gives engineers a clear number to log during process trials and quality checks.
• Quality and metrology labs. Quality labs in FDI plants audit torque on finished parts drawn from the line. Because the Follow-up dial holds the peak, inspectors can test breakaway torque and log the held value.

Dial torque driver TQS1AC compared with similar brands

Before you choose, it helps to compare the dial torque driver TQS1AC with other low-torque drivers. The main question is whether you need to read torque or simply limit it. So the rows below compare dial tools with preset and adjustable designs.

Pick the reading style first, then compare range and units. A dial model gives a live number, while a slip-type driver gives speed on repeat work. Therefore, many plants keep both, and they confirm current specs with each maker. Specifications change over time, so confirm current data with each maker before you decide.

Choosing the right model

• Pick a range that puts your target between 20% and 100% of full scale. The ±2% guarantee covers only that band, so avoid working near the bottom.
• Choose a Follow-up dial when you need to log a peak value or test breakaway torque. Instead, a Basic dial suits simple live readings during assembly.
• Check the units on your drawings before you order. US reading dials show in-oz and in-lb, so metric specs need converting before each job.
• Measure the space around the screw before you order. A stubby 5-1/4 inch driver fits inside housings, while a standard length gives more grip at higher values.
• Decide whether you want a chart with the tool. Models with an AC suffix list a chart in their names, so compare those with plain versions.
• Plan your bits and adapters together with the driver. Some models include a 1/4 inch internal square drive in the handle, so check how your bits will fit.

For other sizes in the same range, compare U.S. Follow-up Torque Driver (with Chart) – TQS6FUAC, U.S. Basic Torque Driver (with Chart) – TQS025AC, U.S. Basic Torque Driver – TQS2A, U.S. Follow-up Torque Driver (with Chart) – TQS050FUAC. Also browse the full Snap-on torque tools shop for handles, testers and adapters.

Care, storage and calibration

• Store the driver in its PB47 case when you are not using it. Then the dial glass and the needle stay safe from drops and dust.
• Wipe the handle and bit end with a dry cloth after each shift. Also keep solvents away from the dial face, because they can cloud the lens.
• Recalibrate every 12 months or 5,000 cycles, as ISO 6789-1:2017 recommends for hand torque tools. We can arrange recalibration through an accredited laboratory.
• Never turn the handle past the top of the scale. Overload can bend the torsion element, so send the tool for checks after any hard drop or overload.
• Carry the driver in its case between sites and keep it dry in the humid season. In addition, let it reach room temperature before precise readings.

Frequently asked questions

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