Fischer 532667 S 4 K NV Expansion Plug 4 mm x 20 mm with Collar, Grey, 100 Pieces

Light-duty fixtures often loosen over time in hollow or solid walls because standard plugs cannot grip the base material reliably. The Fischer S 4 K NV expansion plug solves this with a 4 mm diameter nylon body that expands evenly when the screw is driven, creating a secure hold in concrete, solid brick, plasterboard, and many other common building materials.

Who is it for

This plug is for electricians, carpenters, and DIYers who need a dependable fixing for pictures, light shelves, towel rails, letter boxes, and light mirrors. It works in both solid and hollow substrates, making it a versatile choice for interior jobs.

Main features

• 4 mm diameter, 20 mm length with collar prevents slipping into the drill hole.
• Made from grey polyamide (PA6) for strength and temperature resistance from -40°C to +80°C.
• Pre-positioned installation: push the plug into the hole, then drive the screw.
• Accepts wood or chipboard screws from 2.5 mm to 3.5 mm diameter.
• Pack of 100 pieces covers multiple projects.

Specifications

• Plug diameter: 4 mm
• Plug length: 20 mm
• Drill hole diameter: 4 mm
• Minimum drill hole depth: 30 mm
• Minimum anchorage depth: 20 mm
• Recommended screw diameter: 2.5 - 3.5 mm
• Material: Polyamide (PA6)
• Colour: Grey
• Quantity per pack: 100 pieces
• Suitable base materials: Concrete, solid brick, solid sand-lime brick, aerated concrete, plasterboard, natural stone with dense structure, solid gypsum panel, hollow block made from lightweight concrete, hollow block made from concrete, perforated sand-lime brick, perforated brick

Tips

Drill the hole to the recommended depth and clean out dust before inserting the plug. Use a screwdriver or low-speed drill to drive the screw without overtightening, which can strip the plug. For hollow materials, ensure the plug expands behind the board for maximum pull-out resistance.