Insulation Sleeve M4 Hexagonal 20 mm, Length 8 mm for Wrench

Insulation Sleeve M4 Hexagonal 20 mm, Length 8 mm for Wrench is a protective insulating cover engineered to fit M4 hexagonal heads or nuts with a 20 mm hex size. The sleeve slips over the hex surface to provide reliable electrical insulation and mechanical protection, reducing the risk of accidental contact and short circuits in electrical and mechanical systems. Its 8 mm length keeps the insulating material positioned over the fastener while allowing standard wrench access for tightening and loosening operations.

Advantages

The insulation sleeve offers straightforward installation and consistent coverage of the hex head or nut without altering the fastener profile. Made from insulating material resistant to routine mechanical wear, it minimizes conductive contact and helps maintain safety in assemblies where exposed metal parts could create faults. The sleeve’s dimensions align with common tool use, preserving access for a wrench and enabling quick replacement during maintenance.

Suitable for

• Electrical panels and junction boxes where insulating exposed hex fasteners is required
• Mechanical assemblies requiring protection of fastener surfaces from contact and abrasion
• Maintenance and installation tasks where preventing short circuits is a priority
• Applications with limited space that still allow standard wrench use on hex heads

Key specifications

• Applicable fastener size: M4 hexagonal heads or nuts
• Hexagon external size accommodation: 20 mm
• Sleeve length: 8 mm
• Function: electrical insulation and mechanical protection of hex fasteners
• Material type: insulating polymer (non-conductive)
• Installation method: slip-on over hex head or nut, removable

How to use

Position the sleeve over the hex head or nut so that the sleeve fully covers the conductive surface to be insulated. If necessary, align the sleeve while holding the fastener steady; then use a standard 20 mm wrench through or around the sleeve as required to tighten or loosen the fastener. For removal, slide the sleeve off the fastener; replacement is immediate by repeating the slip-on step. Ensure the sleeve is intact and free of cracks before reusing to maintain insulating performance.

Usage recommendations

Inspect sleeves before installation for physical damage and replace any that show wear. Use this sleeve in environments consistent with the mechanical and thermal limits of insulating polymers, and avoid exposure to solvents or extreme temperatures that could degrade material properties. For applications with specific regulatory insulation requirements, verify compatibility with local electrical safety standards.