R.R.Steel Industries

Length: 32mm (measured from under the head to the end of the threaded shank)

Head Type: Large flat mushroom or round head, often slotted for a flathead screwdriver

Thread: Fully threaded shank with a standard coarse machine screw thread (typically M6 or M8 diameter)

Material: Usually steel, available in zinc-plated, galvanized, or stainless steel for corrosion resistance

Washer Included: Often comes with a square nut and sometimes a washer to distribute load and resist loosening

Primary Use:

• Fixing metal roofing sheets to timber or metal purlins

• Securing items where a wide head is needed to prevent pull-through

Advantages:

• Wide head spreads load, reducing risk of damage to soft materials

• Easy to install with a flathead screwdriver

Common Applications:

• Roofing and cladding

• Sheet metal assembly

• Light-duty structural fixing