Countersunk Rib Head 8 gauge-18 threads per inch x 30mm long screw zinc yellow coating
Countersunk Rib Head screws are for fastening sheeting/fibre cement where a self embedding head is required.
The Zinc Yellow corrosion protection system meets the requirements of ISO 9223 Category 2 (Internal application for mild environments).
AS 3566.2 (Self drilling screws for the building & construction industries) specifies the corrosion protection systems required on screw fasteners Classes 1, 2, 3 & 4 where Class 1 is intended for indoor application and Class 4 for environments up to and including ISO 9223 Category 4 (Severe industrial and severe marine environments).
