Coach Screws (also known as lag screws) are large wood screws with tapered stem, large threads and a sharp end point. Coach screws are produced with square head or hex head typically used for timber-metal connections or two timber joints. These Lag screws have plain stem along with a sufficient thread length to be able to join metal pieces to timber.
BoltPort can manufacture these coach screws in zinc plated steel, stainless steel A2, A4, 304, 316, duplex 2205, copper, brass, titanium, etc. DIN 571 and ASME B18.2.1 covers dimension requirements for Coach/Lag Screws.
Forming | Hot & Cold Forged |
Metric Size | M10 to M100 |
Imperial Size | 3/8 to 8" |
Threads | UNC, UNF, ISO, BSW & ACME. |
Standards | ASME,BS,DIN,ISO,UNI,DIN-EN |
Sub types | 1. Fully Threaded Coach Screws 2. Partial Threaded Coach Screws 3. Metric Coach Screws 4. Imperial Coach Screws |
ASME B18.2.1 | 3/8 inch to 3 inch |
BS 1769 | ½ inch to 2 inch |
ASME B18.2.3.6M | M12 to M36 |
ASME B18.2.3.7M | M16 to M36 |
DIN 6914 | M12 to M36 |
ISO 7412 | M12 to M36 |
UNI 5712 | M12 to M36 |
DIN-EN 14399-4 | M12 to M36 |