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Picture of a 18 8 Stainless Steel Truss Head Combo Machine Screw

18 8 Stainless Steel Truss Head Combo Machine Screw

by The Fastener Depot

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18-8 stainless steel truss head combo machine screws feature a wide, slightly rounded truss head for a clean finish and increased surface coverage, with a combo drive (slotted and Phillips) for flexible installation. These fasteners are ideal for mounting aluminum hurricane shutters to pre-threaded inserts or paired with nuts.

  • Drive Type: Combo (slotted and Phillips for tool flexibility)

  • Installation: Use a flathead or Phillips screwdriver; insert into pre-threaded holes or use with stainless steel nuts and washers

  • Material/Finish: 18-8 stainless steel for strong corrosion resistance in outdoor and coastal environments
              Machine Screw Additional Resources

              Q. What are truss head combo machine screws used for in hurricane shutters?

              These screws are commonly used to fasten accordion and panel shutters to metal tracks, brackets, or pre-threaded inserts. The wide truss head distributes pressure and sits flush without cutting into the material.

              Q. Are these machine screws self-tapping?

              No. Machine screws require pre-tapped holes or must be used with a nut. They’re not designed to cut their own threads.

              Q. What size machine screw do I need?

              ¼″-20 is the standard size for many shutter systems. Choose the length based on the total thickness of the material stack (e.g., shutter frame, bracket, washer).

              Q. Why use 18-8 stainless steel machine screws?

              It offers excellent resistance to corrosion, especially important in hurricane zones with high humidity, salt exposure, and seasonal use.

              Q. Can I use combo machine screws with aluminum shutters?

              Yes. Just be sure to pair them with compatible stainless steel nuts and washers to avoid corrosion when fastening aluminum panels.

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