Flat Spanner Proxxon 20 x 22 mm wrench, offset flat-open end

The Proxxon flat spanner 20 x 22 mm is a low-profile open-end wrench designed for tightening and loosening nuts and bolts with 20 mm and 22 mm widths across flats. Its slim, offset flat design provides access where bulkier tools cannot reach, making it suitable for work under panels, in tight engine bays, and in compact assemblies. The hand tool is intended for workshop and mechanical maintenance use and for assembly tasks that require a compact open-end turning solution.

Advantages

The offset flat-open ends present two common metric sizes in one tool, reducing the need to switch wrenches. The flat profile minimizes clearance requirements and allows the spanner to fit under trim, housings, and closely packed components. Constructed for hand use, it offers straightforward operation without the need for adapters or sockets and is easy to carry in a toolbox or pouch.

Suitable for

• Workshop maintenance and mechanical repairs
• Automotive and motorcycle confined-space fastening
• Assembly of machinery and equipment with limited clearance
• Adjustments under panels, housings, and dashboards

Key specifications

• Open-end sizes: 20 mm and 22 mm
• Flat, offset open-end design for low-clearance access
• Hand tool type: flat spanner / open-end wrench
• Suitable for metric fasteners with matching widths across flats

How to use

Select the end that matches the width across flats of the fastener and place the open jaws fully onto the nut or bolt head to ensure a secure fit. Apply steady turning force in the required direction, keeping the spanner flat to maintain clearance under surrounding components. If access is very tight, use the offset to angle the spanner for better hand clearance while preserving contact on the fastener. Avoid using the spanner as a hammer or applying impact force.

Usage recommendations

Use the Proxxon flat spanner with clean, undamaged fasteners to reduce slippage and rounding. For higher torque requirements, use appropriate longer wrenches or socket solutions; use the flat spanner for low- to medium-torque tasks where clearance is limited. Store the tool in a dry toolbox to protect the working surfaces.