Ridge Assembly 14 gauge-10 threads per inch x 42mm long screw class 4 coating
Hex Head Washer with 16mm Aluminium 5251/EPDM Bonded Washer
Ridge Assembly screws are for fastening the crests of roof sheeting to steel purlins.
The Class 4 corrosion protection system meets the requirements of ISO 9223 Category 4 (Outdoor application for moderate and severe 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).
