Is there a better way to grip with roof fixing and solve the hidden danger of under-the-roof corrosion caused by scratching by the roof sheeting along the shank of the fastener?

A secondary thread located at the top of the shank under the washer face. During installation, the washer face carries the fastener in downward motion while the Hi-Grip thread carries the roof profile in the upward motion. The upward pressure tends to straighten or reverse the indent made by the initial penetration and hence obstructing the possibility of water entry.


– The operator may feels the thread bite, which is a clear signal to prevent over-drilling.

– Restricts “over-drilling” which leads to ponding or drimpling. 

– Prevents sheet moving down the shank when roof is walked on.

– Grips sheet to provide “positive” joint with aluminium bonded EPDM washer.

– Extrudes metal around the fastener hole upwards making water ingress more difficult.

Shank Protection

Shank Protection is a revolutionary patented design feature, to protect fastener shanks from scratching and scouring when crest fixing to metal roofing.


– Cut a slightly larger hole in the roofing profile than the shank diameter, guarding and protecting it.

– Allow the fastener shank to remain unscuffed and scratch-free during installation, keeping the corrosion coating intact and fully functional. 

Drill Point - DX/RX/SD

The drill point is the key factor of self-drilling screws performance. Ocean-Pro self-drilling screws are characterized by aggressive drill points that are made possible by state-of-the-art cold forging technology and tooling.
In Ocean-Pro self-drilling screws, all the elements of performance such as point diameter, point angle, web thickness, and flute length are carefully calibrated for rapid penetration.

The thin chisel edges assure immediate non-walking starts while raked cutting lips, wide spacious flutes, and a tapered entry thread guarantee rapid penetration with low manual pressure needed.

Drill Flute

The length of the drill flute l1 controls the metal thickness drillable. The chips generated during the drilling proceeds are evacuated through the drill flute. If the flute becomes completely embedded in the materials to be drilled, drill chops will clog up in it and the cutting action will cease. This will cause the drill tip to anneal i.e. soften, burn up, or break.

The point length, PL (the unthreaded portion from the tip to the first thread) should be long enough to allow the drilling of all materials to be complete before the first thread engages the material. Hence, the point length of the screw must be greater or equal to the total thickness of all materials to be drilled. When more than one sheet of materials is involved, the calculation of the total thickness to be drilled must include the insulation layer or gap between the top and bottom materials.

Drill Point Length

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