Duplex 2205 and Super Duplex 2507 self-drilling screws contain both the drilling and fastening mechanisms all in one – saving time and effort. These unique screws have a cutting tip, which eliminates the need to drill a pilot hole before installing the bolt. Duplex self-drilling screws are ideal for high strength applications – offering twice the yield strength of annealed austenitic stainless steels like 316 grades. This allows for more wear resistant cutting tips and a much more durable head.

In addition, Duplex 2205 and Super Duplex 2507 provides improved saltwater corrosion protection to 300 series stainless. In particular, Duplex bolts offer excellent resistance to localized corrosion such crevice and pitting, as well as stress corrosion cracking. This corrosion resistance makes Duplex self-drilling screws ideal for harsh marine and saltwater environments where a fast and reliable fastening solution is needed.

Head Style
•    Flanged Hex Head
•    Standard Hex Head
•    Button Head Socket Cap
•    Socket Head
•    Pan Head

Drill Tip
Pointed and fluted drill tip integrated into the screw to cut and remove material.

Bolt Sizes
Typically we offer these fasteners per ANSI B18.6.4 and DIN 7504 from #4- 3/8” and  4-10mm diameters. Other diameters are available upon request.  

In Stock & Custom Availability
Duplex self-drilling screws (DIN 7504) many metric sizes are available in stock and ready to ship. In addition, custom sizes and per-print designs are also available, typically with a 4-6 week lead time. Minimum order quantities are approximately 1000 pieces, depending on size and style unless in stock.

Neoprene / EPDM Washers
Neoprene and EPDM bonded washers could also be paired with the self drilling screw to seal drilled surfaces.