#6 Diameter Screws

Welcome to the “6-Diameter Screws” collection at Old West Iron. This group is organized by shank diameter (gauge) — in this case, screws with a #6 gauge — not by head size or style. #6 screws have a shank diameter of approximately 0.138 in (≈ 3.5 mm). 

These screws sit in the mid-range: thick enough for more reliable grip and moderate strength, yet small enough to use for a variety of woodworking tasks — ideal for cabinetry, furniture, trim work, and interior projects where you don’t need heavy structural fasteners.

FAQ

Q: What does “#6” mean on a screw?
A: “#6” is the gauge number, which refers to the diameter of the screw’s shank (the shaft, including the outer thread diameter). It does not indicate the head size or style. 

Q: Why are the screws grouped by shank diameter instead of head size?
A: Because the shank diameter (gauge) determines the screw’s strength, holding capacity, and the size of pilot-holes needed. Head size or style affects only appearance or how the screw sits, not its functional gauge.

Q: For what kinds of projects is a #6 screw appropriate?
A: #6 screws are well-suited for light- to medium-duty tasks — such as attaching cabinet hardware, trim, light furniture assembly, or interior wood joinery — especially where you want a smaller hole and don’t need heavy structural strength. 

Q: Will I find different head types under #6 screws?
A: Yes. Our collection may include a variety of head styles (flat, round, oval, decorative, etc.) — because we group by shank diameter, not head style. Head design affects appearance and how the screw sits, but not the nominal gauge.

Q: How do I choose screw length when using a #6 screw?
A: Length depends on how deep you need the screw to go into your material. As a general guideline for wood projects: the tip of the screw should penetrate well into the second piece you’re joining — often at least halfway into its thickness.