3/8″ Square Drive Torque Angle Gauge – TA358

The torque angle gauge TA358 belongs to the Snap-on TA series torque angle gauges range, and Lost in HCM supplies it to workshops and factories across Vietnam. It uses a 3/8 in square drive, so match sockets and adapters to that size. Snap-on lists the country of origin as USA.

Torque angle gauge TA358 overview

Many modern engines use torque-to-yield bolts that need a set angle after an initial torque. Torque alone cannot control their clamp load well, because thread friction varies. The torque angle gauge TA358 solves this, since it measures the turn directly.

Snap-on lists this gauge for automotive, diesel, and industrial equipment work. It also suits head bolts and rod bolts on motorcycles. Lost in HCM supplies these gauges to workshops and FDI plants with CO/CQ papers and a VAT e-invoice.

The description (chart) is Torque Angle Gauge, 3/8" Drive.

Specifications at a glance

The table below follows the Snap-on data for TA358. In addition, we converted imperial torque values to N·m where Snap-on lists none.

How the torque angle gauge works

Clamp load matters more than torque, yet torque is only an indirect measure of it. Much of the applied torque goes into thread and head friction, which varies from bolt to bolt. By contrast, angle tightening stretches the bolt by a more predictable amount.

That is why engine makers specify torque plus angle for head bolts, rod bolts, and main caps. However, these bolts often stretch past their yield point and may need replacement. Always check the manual on whether a bolt is reusable.

Key features of the torque angle gauge TA358

Both gauges in this family share the same design, from the degree dial to the reaction arm. Here are the features that matter most when you compare options. They also show how the two drive sizes differ.

• Measures angle-controlled tightening. The gauge determines angle-controlled torque tightening by showing how far the fastener turns. Therefore, you can meet specs written as torque plus a set number of degrees.
• Large degree markings. The dial reads in degrees with large, easy-to-read increments. So technicians can stop at the right angle, even in tight or poorly lit engine bays.
• Two drive sizes. The TA358 uses a 3/8 inch square drive, while the TA360 uses a 1/2 inch drive. That way, you can match the gauge to the sockets and torque level of the job.
• Follows maker specifications. Snap-on designs the gauge so users can follow the manufacturer's tightening specs. As a result, the joint gets the clamp load the engine or machine designer intended.
• Broad equipment coverage. Snap-on lists uses on automotive, diesel, and industrial equipment of many kinds. In addition, the gauge suits cylinder head bolts and connecting rod bolts on motorcycle engines.
• Works with your own tools. The gauge fits between a standard ratchet or breaker bar and the socket. Thus, you add angle control without buying a separate electronic angle wrench.

Snap-on data sheet notes

In addition, the Snap-on data sheet for TA358 notes:

• Determines angle controlled torque tightening.
• Allows user to follow manufacturer's specifications.
• Used on automotive, diesel and industrial equipment, plus head bolts and rod bolts on motorcycles.

Typical applications

These gauges solve one problem well: turning a bolt by an exact angle after snug torque. Below are typical jobs where that matters, from engines to industrial joints. Each one also depends on a firm reaction point.

• Cylinder head bolts. Many engines specify head bolts as torque plus one or more angle steps. The gauge lets technicians apply each step evenly across the whole bolt pattern.
• Rod and main cap bolts. Rod and main cap bolts carry high loads at speed, so clamp load must be right. Therefore, angle tightening helps keep bolt stretch within the design range.
• Diesel engine overhauls. Truck, generator, and marine diesels use large torque-to-yield bolts on heads and caps. The 1/2 inch drive TA360 suits these heavier jobs with a breaker bar.
• Motorcycle engine rebuilds. Motorcycle head and rod bolts are small but critical to engine life. So the 3/8 inch drive TA358 gives fine control on these compact engines.
• Suspension and chassis bolts. Some modern vehicles also use torque-plus-angle specs on suspension and frame bolts. In addition, the gauge helps technicians meet those specs during alignment and repair work.
• Industrial machine assembly. Industrial equipment makers use angle specs on critical joints in pumps, compressors, and gearboxes. As a result, assembly teams get more consistent clamp load from bolt to bolt.

Industries that use the torque angle gauge TA358

Any sector that builds or rebuilds engines needs accurate angle tightening. So these gauges show up in workshops, shipyards, and plants. Here is how each industry uses them in practice.

• Automotive service. Dealers and independent workshops rebuild engines that use torque-to-yield head bolts. In Vietnam, FDI car brands expect their dealers to follow the factory angle specs exactly.
• Motorcycle service and assembly. Vietnam has one of the world's largest motorbike markets, with major plants in Ha Nam and around Hanoi. So service centers and assembly lines need simple angle tools for head and rod bolts.
• Diesel and power generation. Generator rental firms and power plants service large diesel engines on a set schedule. Therefore, technicians use the 1/2 inch drive gauge for head and cap bolts.
• Heavy equipment. Mining and construction fleets rebuild engines on excavators, loaders, and haul trucks. In addition, field crews in northern coal mines and the Central Highlands need simple, rugged angle tools.
• Marine engines. Shipyards and boat workshops in Hai Phong and Ha Long overhaul marine diesels. So engine crews use angle gauges to follow the maker's head bolt procedure.
• Industrial manufacturing. Pump, compressor, and gearbox plants in Binh Duong and Dong Nai assemble joints to strict specs. Meanwhile, quality teams use angle checks to confirm clamp load on key bolts.

Torque angle gauge TA358 compared with similar brands

Before you buy, it helps to see how the torque angle gauge TA358 compares with electronic angle tools. However, the best choice depends on how often you tighten to angle. Instead of features alone, compare cost, durability, and record needs.

Choose a dial angle gauge for occasional or field work and an electronic wrench for heavy daily use. Then match the drive size to your sockets. Confirm current specs with each maker, because features and ranges change often. Specifications change over time, so confirm current data with each maker before you decide.

Choosing the right model

• Pick the drive size that matches your sockets and bolts. The 3/8 inch TA358 suits light engines, while the 1/2 inch TA360 suits larger diesels.
• Read the full tightening spec before you start. Many manuals list a snug torque, then one or more angle steps, in a set bolt order.
• Check whether each bolt is reusable before the job. Torque-to-yield bolts often need replacement, so order new bolts in advance.
• Plan a solid point for the reaction arm on each joint. A loose or moving brace point will throw off the reading.
• Use a breaker bar or long ratchet for large angle steps. A smooth, steady pull gives a cleaner reading than short, jerky moves.
• Consider an electronic torque and angle wrench if you tighten to angle all day. For mixed or field work, a dial gauge is often enough.

For other sizes in the same range, compare 1/2" Square Drive Torque Angle Gauge – TA360. Also browse the full Snap-on torque tools shop for handles, testers and adapters.

Care, storage and calibration

• Store the gauge in a drawer slot or case, away from heavy tools. Then the dial lens and pointer stay safe from knocks.
• Wipe oil and coolant off the gauge after each job with a dry cloth. Also keep solvents off the dial face, because they can cloud the lens.
• Under ISO 6789-1:2017, check the torque wrench you use with this gauge every 12 months or 5,000 cycles. We can arrange recalibration through an accredited laboratory.
• Do not use the gauge to break loose seized bolts or to absorb impact loads. An overload can damage the drive, so loosen bolts with a breaker bar alone.
• Carry the gauge in a case between sites and avoid drops. In addition, keep it dry during the rainy season to protect the dial mechanism.

Frequently asked questions

Request a quote

Send us the part number, quantity and delivery site, and we will reply with a quote. You can request a quote online or call 0902 327 669.