Coach screws are the heavy-duty timber fastener — a hex-head screw with a coarse wood thread driven with a spanner — and we stock DIN 571 in Umm Al Quwain from M6 to M20 and 25 to 300 mm long, zinc plated, hot-dip galvanized and stainless A2 / A4, with washers to suit.
A coach screw (lag screw, lag bolt) has a square or hexagon head, a plain shank and a tapered, coarse wood-screw thread. Driven into a pilot hole in timber with a socket or spanner, it develops high withdrawal resistance without a nut, so it is used where only one side is accessible: fixing timber to timber, brackets to joists, and — with an expanding plug — steel to masonry and concrete. Larger sizes are used for sleeper fixings, timber-frame structures and pergolas.
Applications
- Timber construction, decking and pergolas
- Joist hangers, brackets and post bases
- Sleepers, retaining walls and landscaping
- Machinery and equipment on timber floors
- Steel to masonry with expansion plugs
- Playground, fencing and gate hardware
Standards, grades & finishes
Screws to DIN 571 (hex head), sizes M6 to M20, lengths 25 to 300 mm, carbon steel class 4.6 / 4.8, stainless A2 / A4 to ISO 3506. Finishes zinc plated to ISO 4042, hot-dip galvanized to ISO 1461, plain stainless. Square-head and Torx-drive coach screws, and coach screws with DIN 440 timber washers, to order.
This item is imported from approved mills and held in stock in our Umm Al Quwain warehouse alongside the anchor bolts, studs and plate washers we manufacture ourselves, so complete bolt sets ship from one source. Tensile, hardness and chemical testing is carried out by independent UAE-accredited laboratories, and EN 10204 3.1 certificates are issued with every batch. We supply across the GCC, MENA and Africa.