Frequently asked questions about the Fastening, lifting and protective devices category
What are Fastening, lifting and protective devices and what are they used for?
Fastening, lifting and protective devices are anchors, dowels, bolts, nuts, washers, screws, plus lifting straps and cargo covers. They provide reliable connections in concrete, wood and metal and safe solutions for lifting, securing and assembly in construction and repair works.
How do I choose an anchor or dowel for hollow aerated concrete?
Use anchors/dowels designed for porous or hollow materials with a long body or expansion suitable for aerated concrete. Check the required hole diameter and load rating; for light fixtures products like 8x90 mm anchors are commonly used with matching screws.
Which screws are best for installing exterior siding boards?
Use galvanized or corrosion-resistant screws (C3–C4 coating), such as 2.3x50 mm KZN or CORRSEAL coated screws. Typically 2.3–4.0 mm diameter and 50–60 mm length provide secure fastening for siding.
What is the difference between wood screws and drywall screws, which to choose for a wooden battens?
Wood screws have a sharp tip and coarse thread for wood; drywall screws are thinner and designed for plasterboard. For wooden battens choose screws like 4.0x25–4.5x70 mm depending on board thickness; for plasterboard use thinner 3.9x41 mm drywall screws.
Which bolt and nut are suitable for metal angle brackets?
Use hex bolts (DIN 933) with a matching nut and washer, commonly M6–M10. Choose A4 stainless versions for outdoor use and ensure bolt length passes through both parts with 1–2 threads protruding.
Which products are suitable for temporary fixing during installation (collated nails, assembly nails)?
Use collated/cassette nails and collated screws such as 2.8x75 mm collated nails or Senco 3.5x25 mm collated screws. They speed up installation and hold components in place until permanent bolts or anchors are fitted.
How to choose fastenings for façade dowels and long anchors (10x120 mm and above)?
Select façade dowels/anchors sized 10x120 mm or longer designed for deep embedment and load distribution, using hex or hex-head screws/bolts. Consider the base material (concrete/brick) and choose anchor type rated for the required load capacity.
Which lifting straps and cargo covers are suitable for moving furniture?
Use lifting/ratchet straps 25–50 mm wide with high break strength and anti-slip surfaces and a ratchet mechanism for secure tightening. Protect furniture with durable covers and foam pads to prevent scratches and dents during transport.
How to check compatibility of a screw and drill bit for self-drilling installation?
The drill bit must match the manufacturer's recommended diameter for the screw; for 3.0–3.5 mm screws use the corresponding bit or no pilot for many wood applications. Check the product spec (e.g. ESSDRIVE 3.0x16) and choose a bit with the correct diameter and length to ensure proper fit and avoid splitting.
Which washers and lock washers are needed when fastening bolts to thin metal?
Use flat washers to spread the load and spring/lock washers to prevent loosening. Match the washer hole to the bolt size (e.g. M6) and choose A4 stainless or galvanized material for corrosion protection.