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A
is the No: Size. See No: Conversions below
B is the Length of where the Screw is measured. Self- Tapping Screw have a finer thread witch runs full length. Opposed to Woods Screw. They can be used in most material i.e. Wood, Aluminum, GRP (Fiberglas), Mild Steel Sheet, Plastics. A pilot hole is normally needed. |
| No4 = 3mm, No6 = 3.5mm, No8 = 4mm, No10 = 5mm, No12 = 5.5mm, No14 = 6mm. | |
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