wiha 352/3.0 Hex Key (Allen Key) — 3 mm

wiha 352/3.0 — 3 mm hex key (Allen wrench) is a single-size hand tool designed for driving hexagonal socket screws. Manufactured by wiha, this compact 3 mm hex key is intended for precision assembly, maintenance and repair tasks where a small, accurate turning tool is required. Its simple form factor makes it convenient for use in tight spaces and for repeatable torque control on small fasteners in electronics, bicycles, furniture and light machinery.

Advantages

The 3 mm hex key offers a precise fit to hex socket screws to reduce cam-out and rounding. Its solid construction provides reliable torque transfer and durability under typical hand-use conditions. The compact size allows access to confined areas and easy storage in tool rolls or pockets. The straightforward single-piece design requires no adjustments and ensures consistent alignment with the screw head for controlled tightening and loosening.

Suitable for

Key specifications

How to use

Insert the 3 mm hex tip fully into the hex socket of the screw to ensure proper engagement. Apply steady, controlled torque clockwise to tighten or counterclockwise to loosen, keeping the key aligned with the screw axis to avoid slippage. For screws recessed below the work surface, use the long arm for reach and the short arm for increased leverage when required. Inspect the tool and screw head before use to confirm fit and to prevent damage to the fastener.

Recommendations

Use the hex key only for turning compatible hex socket screws of the correct 3 mm size. Do not use the tool as a pry bar or lever beyond intended hand torque limits. Store in a dry place and keep tips clean to maintain fit accuracy; replace the tool if the tip becomes rounded or damaged.