Stainless Steel Self Drilling Screws (for metal)
Stainless Steel Self Drillers (Stainless Steel Tek Screws)
Self Drilling Screws are designed specifically for drilling through thin sheet metal, and are available in a range of head types and drives. Stainless Steel Self Drillers are available in 410 Stainless Steel, 304 Bi-Metal and Hardtec or Marutex Stainless Steel. A key feature is the self drilling tip which is the part of the screw that drills the hole. The specially shaped flute clears the swarf from the hole for the threaded part of the screw to tap. The main thing to remember is that the total thickness of the sheets being fastened cannot exceed the length of the self drilling tip of the screw, otherwise the thread will strip or the screw will jam in the hole.
For more information on where and when to use the differnt types of self drilling screws click here or refer to the .pdf document on this page.
Countersunk Square Drive Self Drillers have a a countersunk or flat head so that when drilled into the sheet the head of the screw will sit flush with the surface of the sheet metal. Identified by their head type, drive, nominal diameter in gauge and length (overall length) they are available in 8 and 10 gauge and from 3/4” to 2” in length.
Pan Head Self Drilling Screws are available in square and phillips drive and have a flattened dome head shape with a flat base. The wide flat base of the head offers excellent holding ability, also identified by their head type, drive type, nominal diameter in gauge and length (from under the head). Pan Head Self Drilling Screws are available from Anzor Fasteners in 8 and 10 gauge and in lengths from 1/2” to 2” in both square (Robertson) and phillips drive.
All Countersunk Head and Pan Head Self Drilling Screws are manufactured from 410 grade stainless steel which can be hardened by heat treatment unlike the 300 series grades. 410 is hard and cost effective but does not have the added corrosion resistance offered by Marutex and Hardtec which perform better than 304 and close to 316 in Salt Spray Tests.
Countersunk Head Square Drive Black Self Drillers the countersunk head on these screws allows them to sit flush with the surface of the object, these screws are black in colour while still made of 410 grade stainless steel, commonly used in the aluminium joinery industry. Identified by their head type, drive, colour, nominal diameter (as a metric value) and overall length.