Roofing self-drilling screws (Unslot indented hexagon head withbonded EPDM washer SDS).

Material: Hardened Carbon Steel C1022A

Core hardness: 300-460HV

Surface hardness: min 450HV

Surface Treatment: Zinc plated

Standard: DIN, ASTM

Certification: ISO9001, CE

Non-standards: OEM is available if you provide the drawing or sample

Washer: EPDM, Non-conductive

Drilling point: #1