US/ Newton Meter Basic Torque Driver – TQSI055A

The dial torque driver TQSI055A belongs to the Snap-on Torqometer® 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 TQSI055A overview

Fine fasteners need fine control, because a few tenths of a newton meter can strip a thread. The dial torque driver TQSI055A gives you that control with a clear dial and small increments. For example, the lowest ranges step in 0.001 N·m, so you can read very light torque.

Most models in this family use a follow-up pointer that stays at the peak reading. Meanwhile, basic models show only the live pointer, which suits quick checks. Every tool carries a one-year Snap-on Repair Center warranty and fits the PB47 storage case.

The asme®/ansi® is B107.14M-1994. The model is Standard Basic. The dial is US/N•m Reading.

The length is 7-3/4 inches. The increments is .001 N•m. The range is .055 N•m.

Specifications at a glance

The table below follows the Snap-on data for TQSI055A. In addition, we converted imperial torque values to N·m where Snap-on lists none.

How the dial torque driver works

A dial torque driver has a torsion element inside the body between the handle and the drive. When you turn the handle, that element twists a small, known amount under load. Then a gear train turns the pointer, so the dial shows the torque in real time.

First, you fit the bit or socket to the 1/4 inch drive and set the follow-up pointer to zero. Next, you turn the handle slowly and watch the main pointer climb. Finally, you stop at the target value and read the peak on the follow-up pointer.

Key features of the dial torque driver TQSI055A

Every driver in this family shares the same design logic, from the dual scale dial to the stated accuracy band. Here are the features that matter most when you compare options.

• Dual US and N·m dial. Each dial reads in US units and in N·m on the same face. Therefore, teams that work from US and metric drawings can use one tool without a conversion chart.
• Two percent reading accuracy. Snap-on states ±2% of reading from 20% of full scale to full scale. That figure applies clockwise and counterclockwise, so the tool suits right-hand and left-hand threads.
• Follow-up peak pointer. Follow-up models add a second pointer that stays at the highest torque you reached. As a result, the operator can release the handle first and then read the peak value calmly.
• Very low torque ranges. The smallest models read up to 0.055 N·m in 0.001 N·m steps. In addition, the largest model in this family reaches 8.4 N·m, or 75 in-lb, for heavier screws.
• Stubby and standard bodies. Stubby models measure 5-1/4 inches, while standard models run 7-3/4 or 8-11/16 inches long. So you can pick a short body for tight spaces and a longer one for comfort.
• One-quarter inch drive. Every driver in this family uses a 1/4 inch drive. That way, it accepts common bit holders and small sockets that most electronics and instrument benches already stock.

Typical applications

These drivers solve one problem well: showing the torque on small screws as you turn. Below are typical jobs where that matters, from board assembly to audit checks. Each one also rewards a clear peak reading.

• Circuit board and connector screws. Small screws on boards, connectors, and housings crack parts when overtightened. A dial driver shows the exact value as you turn, so the operator stops before damage starts.
• Instrument and sensor assembly. Sensors, gauges, and medical devices often call for torque well below 1 N·m. For example, the 0.11 N·m and 0.34 N·m models suit these very light fasteners.
• Audit checks on finished parts. Quality teams use the follow-up pointer to check breakaway or residual torque on screws already fitted. Then they record the peak value on the inspection sheet.
• Optical and camera modules. Lens mounts and camera modules use tiny screws in soft materials. Because the dial reads in fine steps, technicians can tighten them evenly without distorting the housing.
• Aircraft instrument panels. Avionics and panel screws carry low torque values in maintenance manuals. Therefore, a dial driver with a US and N·m scale suits both US and European documents.
• Setting up power screwdrivers. Line teams sometimes compare an assembly screwdriver against a hand reading on a sample joint. A follow-up dial driver gives a quick peak value for that comparison.

Industries that use the dial torque driver TQSI055A

Any sector with tiny fasteners, soft housings, or strict quality records needs low torque control. So these drivers show up in plants, hangars, and inspection rooms. Here is how each industry uses them in practice.

• Electronics manufacturing. Board, phone, and appliance plants use very small screws in high volume. In Vietnam, many FDI electronics plants in Bac Ninh and Thai Nguyen need traceable low-torque tools for audits.
• Precision instruments. Makers of gauges, meters, and sensors tighten tiny fasteners in soft housings. So a dial driver with fine steps helps them avoid cracked parts and stripped threads.
• Aerospace and avionics. Aircraft panel and instrument work follows torque values in the maintenance manual. Therefore, MRO teams at Vietnamese airports use dial drivers that read in US units and N·m.
• Medical devices. Device plants assemble small housings and fittings where every screw needs the same torque. In addition, their quality systems ask for tools with a documented accuracy class.
• Automotive electronics. Control units, sensors, and lamp assemblies use light screws on plastic bosses. Suppliers in Vietnam's industrial parks use dial drivers to set and check these joints.
• Quality and metrology rooms. Inspection teams check residual torque on sample parts from the line. Because the follow-up pointer holds the peak, they can read and log each result without rushing.

Dial torque driver TQSI055A compared with similar brands

Before you buy, it helps to compare the dial torque driver TQSI055A with other light torque tools. However, the first question is the reading style you need. Instead of a preset click, a dial shows the full torque build-up and the peak value.

Choose a preset driver for fast repeat work and a dial driver for checks and sensitive parts. Many plants use both types side by side. Meanwhile, ranges and units differ between brands, so 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 where your target sits between 20% and 100% of full scale. Snap-on states the ±2% accuracy only inside that band.
• Choose a follow-up model when you need to record peak values. Basic models suit quick checks where the operator watches the dial the whole time.
• Use a stubby body for tight spaces inside housings or panels. A standard body gives a longer grip, which helps on repeat work at a bench.
• Match the increment to your tolerance. For example, a spec of 0.05 N·m ±10% needs a model that reads in 0.001 N·m steps.
• Check which product names include a calibration certificate or chart. Then order the right version if your quality system asks for a document with the tool.
• Plan one PB47 storage case for each driver. The case keeps the dial and pointer safe in a drawer or during transport between lines.

For other sizes in the same range, compare US/ Newton Meter Basic Torque Driver – TQSSI.11A, US/ Newton Meter Follow-up Torque Driver – TQSR4FUA, US/ Newton Meter Follow-up Torque Driver – TQSI055FUA, US/ Newton Meter Follow-up Torque Driver – TQSI.34FUA. Also browse the full Snap-on torque tools shop for handles, testers and adapters.

Care, storage and calibration

• Store each driver in its PB47 case with the pointer at zero. Then the dial glass and the pointer stay safe from knocks in a drawer.
• Wipe the body and dial with a dry, lint-free cloth after use. Also keep solvents away from the dial, because they can cloud the lens.
• Send the driver for calibration every 12 months or 5,000 cycles, as ISO 6789-1:2017 recommends. We can arrange recalibration through an accredited laboratory.
• Never turn the driver past the top of its scale. Overload can bend the torsion element, so withdraw any tool whose pointer no longer returns to zero.
• Pack drivers in their cases for transport between sites. In addition, keep them dry during the humid season so the gears and dial stay clean.

Frequently asked questions

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