metal roofing screws(HEAVY STEEL TEK SELF DRILLING METAL CORRUGATED ROOFING SCREW)
Feature：Steel to Steel For Heavy Section Purlins (Hot Rolled Purlin)
Head：Hexagon Self-Drilling.
Roofing screws with a 5/16th hexagonal head for attaching sheets to heavy section steel purlins,
between 6.0mm to 12.5mm.

• Slotted Round Head Machine Screws
• Slotted 4-40 Machine Screw Black Oxide Abrasive

Machine screws, Phillips pan head, Stainless steel 18-8 black oxide finish, #4-40 Pan head machine screw length is measured from under the head to the end of the screw. Note: Thread length on machine screws can vary.

The 16mm rubber washer beneath the aluminium flange expands under pressure and forms a permanent weather-seal.

Designed for fixing cladding and sheet metal to light and heavy structural purlins as used when constructing industrial units.

Slotted Round Head Machine Screws

Slotted 4-40 Machine Screw Black Oxide Abrasive