PB Swiss 8320A Torque Limiting Driver: Precision Torque in a Screwdriver Form

Introduction

Most people picture a torque wrench as a long, bulky tool for wheel lugs. The PB Swiss 8320A takes a very different approach: it looks like a screwdriver, fits like a screwdriver, but limits torque like a proper precision instrument. With a digital display on the back end and interchangeable shanks, it slots neatly into the very low end of a torque tool collection, which is exactly where many larger wrenches stop being useful.

Who This Product Is For

This handle is aimed squarely at fine electronics work. Small electronic screws often bottom out rather than torquing to a spec, but some do carry torque ratings, and tightening them by feel is a gamble. A driver that starts limiting at 10 cNm makes that range accessible in a way a standard torque wrench simply cannot.

It also fits naturally into a toolbox that already has larger torque tools. Paired with a digital torque wrench covering 15 to 300 in-lbs, the 8320A handles the precision range that tool leaves untouched, making the two a complementary pair rather than competitors.

The Digital Display and How It Works

The rear of the handle carries a digital display that turns on with a push. A 3mm hex wrench drops into an opening on the back to adjust the torque limit. The display switches between Imperial (inch-pounds) and metric (SI units) with a press and hold, and it reads down to tenths of a cNm, or hundredths of an inch-pound in five-unit increments.

The gray cap version reviewed here covers 10 to 80 cNm, roughly 0.89 to 7.08 in-lbs. PB Swiss also makes versions covering other ranges, including one from 0.3 to 1.84 ft-lb and another from 0.74 to 3.69 ft-lb. Once the limit is set, the driver simply refuses to tighten past it.

Interchangeable Shanks

Instead of a fixed bit, the 8320A accepts PB Swiss interchangeable shanks, including quarter-inch hex and quarter-inch square drive versions. That flexibility means one handle can serve different bit and socket needs without buying separate torque drivers for each tip style.

The round handle shape is worth noting too. Compared with trilobe handles designed to fit the hand in multiple orientations, a round handle offers a more infinite range of grip positions. It is a matter of preference, but the low, controlled torques this tool is used at favor a grip you can hold delicately.

Build Quality and Design

The design is refreshingly simple. The PB logo is present, the unit ships with a certification, and a serial number sits on the tool itself. It is also a lightweight tool, noticeably lighter than bulkier torque wrenches, which helps during long precision sessions.

At low settings the behavior is easy to appreciate: set around 11.5 cNm, the driver can be turned and held with just two fingers, and turning it below its limit feels nearly free because the internal mechanism simply unwinds. It always limits at something within its range, so it cannot be used as a regular screwdriver, but that is the point.

Things to Consider Before Buying

The range is the first thing to check. The gray cap version reviewed here tops out at 80 cNm, so anything above that needs one of the other range versions or a larger torque wrench. Second, the tool works in cNm natively, so if you think in inch-pounds or newton meters, expect to lean on the unit conversion or do a quick mental conversion.

Finally, remember it is a torque limiter, not a driver for general use. Every turn is capped at whatever limit you have set. If you need an everyday screwdriver, keep a separate one in the drawer.

Buying Advice

If your work involves delicate screws with torque ratings, especially in electronics, this tool fills a gap most torque wrenches cannot. Buy the range version that matches the torque specs you actually encounter, and consider it as the precision complement to a larger digital torque wrench rather than a replacement for one.

Conclusion

The PB Swiss 8320A is a thoughtfully designed torque limiting driver that brings digital precision to the lowest torque range, wrapped in a handle that is genuinely pleasant to use. For fine electronics work, it is a niche tool, but a very well-executed one.