NAC multifunction flat wrench 8-22 mm, brand NAC, model NAC-SP-M-LOCK

The NAC multifunction flat wrench NAC-SP-M-LOCK is a single compact tool designed to fit hex nuts and bolts from 8 to 22 mm. It combines multiple fixed wrench openings along one flat body so you can switch between several metric sizes without changing tools. The tool is intended for general maintenance, assembly, repair and light industrial tasks where carrying a set of individual wrenches is impractical.

Advantages

This multifunction flat wrench reduces the number of separate tools needed by covering a continuous range of common metric sizes in one piece. Its flat profile makes it easy to store in a toolbox or pocket and to use in tighter spaces compared with bulkier tool sets. The tool’s stamped/opening design provides clear size marking and firm engagement with hex fasteners, while the single-piece construction minimizes the risk of losing individual wrenches.

Suitable for

• Home maintenance and DIY repairs involving metric nuts and bolts (8–22 mm)
• Automotive light repairs and adjustments where multiple wrench sizes are commonly needed
• Assembly tasks for furniture or equipment that use standard metric fasteners
• Portable tool kits for field service and on-site maintenance

When it may not be suitable

This multifunction flat wrench is not intended to replace a precision or heavy-duty individual wrench when high torque is required; using it for very tight or rusted fasteners may cause slippage or deformation. It also may not be optimal where access is required around obstructions that need an angled or boxed wrench head for leverage.

Key specifications

• Supported fastener sizes: metric range from 8 mm up to 22 mm
• Design: flat, multi-opening wrench body covering multiple sizes
• Material: durable metal construction suitable for general repair work
• Form factor: single-piece, compact and pocket-friendly profile
• Typical applications: maintenance, assembly, automotive light repair

How to use

Select the opening that matches the hex nut or bolt size, engage the wrench fully on the fastener, and apply steady turning force. For best results, ensure the wrench is seated squarely on the flats of the fastener to minimize rounding. Use gradual increasing force rather than sudden jerks; if a fastener is seized, apply penetrating lubricant and allow time before attempting removal. Keep the wrench clean and inspect openings for wear before use.

What to consider before purchase

• Whether the 8–22 mm size range covers the fasteners you commonly work with
• Need for high-torque or boxed/offset wrench access — consider dedicated wrenches for those tasks
• Material durability and compatibility with the level of use (home vs. industrial)
• Storage and portability advantages compared with carrying multiple individual wrenches

Usage recommendations

Use the NAC multifunction flat wrench for light-to-moderate torque tasks and as a convenient portable alternative to a full wrench set. Avoid forced high-torque applications and maintain the tool by keeping it clean and dry to extend service life.