Frame Anchor Koelner/Rawlplug FF1 with Countersunk Collar 8x120 mm, pack 20

Koelner/Rawlplug Frame Anchor FF1 with countersunk collar, size 8x120 mm, pack of 20 is a mechanical expansion anchor designed for fastening window and door frames, timber profiles and light structural connections into solid substrates such as concrete and solid brick. The anchor consists of a metal sleeve and expansion cone that create a secure clamping effect when driven and tightened, providing reliable load transfer and straightforward installation with standard tools.

Advantages

The frame anchor offers consistent mechanical expansion that ensures a firm hold in solid bases. Its countersunk collar allows the fastener head to sit flush with or below the surface, improving appearance and enabling neat frame seating. Supplied in a pack of 20, the anchors are suitable for a series of repetitive installations and reduce the need to open multiple small packs. Installation requires only a drill, hammer and wrench, making on-site fitting quick and predictable.

Suitable for

• Fixing window and door frames to concrete and solid masonry
• Securing timber elements and structural profiles
• Light to medium load connections in renovations and new builds
• Indoor and outdoor applications in solid substrates

When it may not be suitable

This anchor is intended for use in solid substrates; it is not suitable for hollow or cavity blocks without additional cavity fittings. For applications requiring heavy structural loads or dynamic loading, a specialist structural anchor or consultation with a structural engineer may be necessary. Corrosive environments require confirmation of the anchor material and corrosion protection before use.

Key specifications

• Anchor type: mechanical expansion frame anchor with countersunk collar
• Diameter: 8 mm
• Length: 120 mm
• Head style: countersunk collar for recessed or flush installation
• Material: metal sleeve and cone (mechanical expansion system)
• Pack quantity: 20 pieces
• Intended substrates: solid concrete and solid masonry

How to use

Drill a hole in the substrate to the recommended diameter and depth, clean the hole of dust, insert the anchor so the countersunk collar sits flush with the surface, then drive the expansion cone and tighten the screw or bolt with a wrench until the sleeve expands and the anchor is firmly seated. Follow manufacturer drilling depth and hole cleaning recommendations to achieve rated performance. Avoid overtightening; tighten until the anchor is secure and the frame is correctly positioned.

What to consider before purchase

• Verify the substrate is solid concrete or solid masonry suitable for mechanical expansion anchors
• Confirm the anchor length and diameter suit the frame thickness and load requirements
• Assess environmental conditions for corrosion resistance needs
• Ensure compatibility with the bolts or screws you intend to use

Usage recommendations

For reliable results, use a correctly sized hammer drill and appropriate diameter drill bit, clean holes with a brush or compressed air, and check embedment depth. For exterior installations in aggressive environments, choose anchors with suitable corrosion protection and follow local building codes for frame fixings.