Screw FISCHER 558881 metal wood screw 100 mm, Ø 5 mm, thread length 60 mm, pack 100

FISCHER 558881 is a metal wood screw 100 mm long with a 5 mm thread diameter and a 60 mm threaded length, supplied in a pack of 100. Designed for adjustable and secure fastening of frames, substructures and timber constructions, this screw combines a countersunk head and a dedicated clip thread to allow stepless adjustment of the distance between the attachment part and the substrate. The screw features a PowerFast II chipboard thread profile for fast bite and consistent penetration into wooden materials.

Advantages

The countersunk clip is engineered to remain stationary in the attachment part during adjustment so the screw head maintains its set position and installs flush without protruding heads. The special operating principle permits stepless adjustment by opposing rotational directions between bit and clip, enabling precise alignment of the attachment. The clip’s thread allows later unscrewing from the attachment part, which facilitates disassembly. The PowerFast II thread geometry ensures quick engagement with the material and efficient driving into wood and wood-based panels.

Suitable for

• Adjustable mounting of frames, facade profiles and substructures on wooden substrates
• Ceiling and wall substructure fixation where fine height adjustment is required
• Carpentry and assembly work in softwood, chipboard and similar materials
• Applications requiring later disassembly or readjustment of the attachment

When it may not be suitable

This screw is intended primarily for wood and similar substrates; it is not designed as a direct replacement for specialised structural fasteners in heavy-load steel-to-steel connections. For use in masonry or concrete, approved anchors and a suitable matching plug must be used and the correct pre-drill size observed. Very hard dense hardwoods or applications requiring high shear resistance may require different fastener types or pre-drilling and additional mechanical fixing methods.

Key specifications

• Length: 100 mm
• Thread diameter: 5 mm
• Threaded length: 60 mm
• Head style: countersunk with clip
• Thread type: machine-cut PowerFast II chipboard thread
• Material: steel (zinc or corrosion protection as per manufacturer finish)
• Pack quantity: 100 pieces
• Recommended pre-drill diameter for thick boards/hardwood: 6 mm

How to use

For through installation, insert the screw through the attachment part and turn it with the compatible bit so the head sits flush or slightly countersunk in the attachment. To adjust the distance between attachment and substrate, use the bit (without the setting tool) and change the rotation direction; the clip holds its position while the screw adjusts the spacing steplessly. For thick wooden boards (>30 mm) or hardwoods and when working near edges, pre-drill a 6 mm hole to reduce splitting and ensure correct engagement. For masonry applications, use the recommended anchor type and pre-drill according to anchor instructions before inserting the screw with the suitable plug.

What to consider before purchase

• Confirm substrate type and thickness (pre-drilling may be required for boards > 30 mm or hardwood)
• Ensure the screw length and threaded length suit the assembly and allow sufficient engagement in the base material
• Check corrosion protection or coating requirements for the installation environment
• Plan for the correct setting tool/bit and any anchors if installing into masonry or hollow substrates

Usage recommendations

Use the dedicated bit and, when required, the separate setting tool to achieve flush installation and precise stepless adjustment. Pre-drill a 6 mm hole for thick panels and hardwood; follow anchor manufacturer instructions when combining with plugs for masonry. For repeatable results, use consistent driving speed and check alignment before final tightening.