Preset Torque Screwdriver – QDRIVER4P

The preset torque screwdriver QDRIVER4P belongs to the Snap-on QDRIVER preset torque screwdrivers range, and Lost in HCM supplies it to workshops and factories across Vietnam. Snap-on lists the country of origin as USA. The length is 6 inches.

Preset torque screwdriver QDRIVER4P overview

The preset torque screwdriver QDRIVER4P is a low-torque screwdriver that is set to one value before it ships. You name the torque you need when you order. Then the cam-over clutch slips at that value, so the operator cannot overtighten small screws.

The family spans four models with ranges from 6 in-oz up to 40 in-lb. In metric terms, that covers about 4 N•cm up to 451 N•cm. Each driver accepts standard 1/4 inch hex bits, and Snap-on lists the USA as country of origin.

The range is 40 in-lb (451 N•cm) maximum. The range is 4 in-lb (45 N•cm) minimum.

Specifications at a glance

These figures come from the Snap-on listing for QDRIVER4P. Values marked “calculated” are unit conversions we added for convenience.

How the preset torque screwdriver works

Preset drivers differ from adjustable drivers in one key way. Instead of a scale on the handle, the setting sits inside the tool. Therefore, operators cannot change the value by mistake, which suits repeat assembly with one spec per station.

The stated accuracy applies only in the clockwise direction. So use these drivers for tightening, not for checking break-away torque on loosening. Also, keep each driver at its assigned station, since the value is fixed for that joint.

Key features of the preset torque screwdriver QDRIVER4P

Every driver in this family shares the same design logic, from the cam-over clutch to the hex bit shank. Here are the features that matter most when you compare your options.

• Factory preset torque value. You state the torque rating you need when you order the driver. Therefore, each tool arrives dedicated to one value, which suits stations with a single screw spec.
• Cam-over torque-limiting clutch. The clutch free-wheels when torque hits the set value. As a result, extra hand force does not pass to the screw, so threads and parts stay safe.
• Wide low-torque range. The four models run from 6 in-oz up to 40 in-lb. That span covers tiny electronics screws as well as small terminal and cover screws.
• Standard 1/4 inch hex bits. Each driver accepts all standard 1/4 inch hex screwdriver bits. So teams can use the Phillips, Torx, or hex bits they already stock for the job.
• Magnetic bit retention. A magnet holds the bit in the shank during use and between parts. In addition, this cuts the risk of a bit dropping into an open assembly.
• Aluminum body, steel shank. The body uses light aluminum, while the shank uses steel for strength. This mix keeps the tool light and easy to hold through a long shift at the bench.

Snap-on data sheet notes

Snap-on also lists these details for QDRIVER4P:

• 4-40 in-lb preset torque screwdriver.
• Textured body provides a nonslip grip.
• When ordering, the user must designate desired torque rating to be set.

Typical applications

These drivers solve one problem well: stopping every small screw at one fixed value. Below are typical jobs where that matters, from circuit boards to sealed plastic housings on assembly lines.

• Circuit board mounting screws. Board screws need light, even torque so the board does not crack or flex. A preset driver in the in-oz range stops at the same value on every screw.
• Connector and terminal screws. Terminal screws must clamp wires firmly without stripping soft brass threads. For example, the in-lb models suit control panel terminals, small relays, and breaker screws.
• Plastic housings and covers. Self-tapping screws in plastic housings strip easily when overtightened. Therefore, a cam-over driver protects the screw boss and keeps the cover sealed against dust and moisture.
• Sensor and camera modules. Sensors, lenses, and camera modules need exact clamping to keep alignment. In addition, the light aluminum body helps operators work with steady hands on delicate parts.
• Medical device assembly. Medical device makers document torque on many small fasteners. A dedicated preset driver at each station gives the same value on every unit without any setting change.
• Repeat bench assembly stations. Bench stations often tighten one screw type all day. So a preset driver fits this work well, because the operator cannot change the value by mistake.

Industries that use the preset torque screwdriver QDRIVER4P

Any sector with circuit boards, terminals, or small housings needs gentle, repeatable torque. So these drivers show up on electronics lines and medical benches. Here is how each industry uses them in practice.

• Electronics manufacturing. Phone, PC, and component plants tighten thousands of tiny screws per shift. Factories in Bac Ninh, Bac Giang, and Thai Nguyen use preset drivers to keep torque even across lines.
• Automotive electronics. Control units, sensors, and wiring modules need light, exact torque on small screws. FDI suppliers in Vietnam's industrial parks also need repeatable results for customer audits.
• Medical devices. Device makers must control torque on small fasteners in housings and instruments. Therefore, FDI plants in southern export zones use preset drivers at dedicated stations to meet audit rules.
• Aerospace and avionics. Avionics boxes and cabin parts use small screws with strict torque specs. MRO teams at Vietnamese airports also use preset drivers for repeat panel and connector work.
• Appliance and electrical. Appliance and switchgear plants tighten terminal and cover screws all day. In Binh Duong and Dong Nai, these teams use cam-over drivers to avoid stripped threads.
• Optics and instruments. Camera, laser, and measuring instrument makers need gentle clamping on fine parts. So plants in Hanoi and Ho Chi Minh City high-tech parks choose low-range preset drivers.

Preset torque screwdriver QDRIVER4P compared with similar brands

Several makers sell preset or adjustable torque screwdrivers for precision work. Each brand uses its own clutch design, range steps, and setting method. The comparison below shows where the preset torque screwdriver QDRIVER4P fits among common choices on the market.

If your stations need one fixed value per tool, a factory preset driver is a simple choice. It cannot drift from a user setting change. Even so, confirm current specs with each maker before you compare drivers. Specifications change over time, so confirm current data with each maker before you decide.

Choosing the right model

• Start with the torque spec for each screw. Then pick the model whose range places that value between 20% and 100% of full scale.
• State your target value clearly when you request a quote. These drivers ship preset, so the value you order becomes the working setting.
• Plan one driver per station when each station uses a different spec. That way, operators never swap tools that hold different values.
• Check that your bits use a standard 1/4 inch hex shank. For example, insert bits and power bits both fit, so match the bit to your screw head.
• Ask whether your audit needs a calibration certificate. These drivers ship without one, so we can arrange calibration through an accredited laboratory.
• Use these drivers only for tightening in the clockwise direction. Snap-on states the accuracy for clockwise use, so pick another tool for loosening.

For other sizes in the same range, compare Preset Torque Screwdriver – QDRIVER1P, Preset Torque Screwdriver – QDRIVER2P, Preset Torque Screwdriver – QDRIVER3P. Also browse the full Snap-on torque tools shop for handles, testers and adapters.

Care, storage and calibration

• Store each driver in a labeled holder at its station, away from loose tools. Also mark the preset value on the holder, so operators grab the right tool.
• Wipe the body and shank with a dry cloth at the end of each shift. Then check the magnet for metal chips, because debris can hold the bit off center.
• Send each 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 use the driver to loosen stuck screws or as a pry tool. Abuse can wear the cam clutch, so check the value after any drop or hard knock.
• Pack drivers in a padded case when you move them between lines or sites. In addition, keep them dry during the humid season so the clutch stays clean.

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.