Picture Framing Screw Sizes

zinc plated screwEver wondered what size a number ‘4’ screw is and whether you’d be better with a number ‘3’ ? well here’s a table of screw widths (thread widths) commonly used in picture framing –

No. ‘1’ = 2.0mm diameter
No. ‘2’ = 2.2mm diameter
No. ‘3’ = 2.5mm diameter

No. ‘4’ = 2.9mm diameter
No. ‘6’ = 3.5mm diameter
No. ‘8’ = 4.2mm diameter
No. ’10’ = 5.0mm diameter
No. ’12’ = 5.5mm diameter
No. ’14’ = 6.5mm diameter

You can check out out picture framing screw and pins page for all your screw and pin purchases.

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