Type 17 Hex Head 12 gauge-11 threads per inch x 25mm long screw full thread without seal, class 4 coating
Type 17 Hex Head screws without seals are for general fastening to timber where a water tight seal is not necessary.
Type 17 screws are a self drilling point for fastening into timber. The hardened point will also drill through thin metals up to 0.75mm thick that makes this point suitable for fastening sheets to timber battens. The screw threads extend down the point thus the screw "pulls" itself into the timber that reduces the required drilling pressure and reduces the risk of stripping of threads due to "over running".
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).
