Machine screw sizes?

I need some 10mm long countersunk machine screws for Pegler Belmont lockshield radiator valve caps but can't work out the size and Pegler have ignored my requests. M4 is too thin and M5 too thick. Can't find any to match up in the shops. Anyone know which imperial size comes between the two? Would it be 3/16" (nearest equivalent to 4.5mm)? I'm not sure how imperial screws are measured.

Reply to
rrh
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Here is a selection from my table of common machine screw sizes, in diameter order:

Type Size Diam " TPI Dia mm Pitch mm BSW 5/32 0.15625 32 3.97 0.79 MF 4 0.157 50.80 4 0.5 M 4 0.157 36.29 4 0.7 BA 3 0.1614 34.84 4.10 0.73 M 4.5 0.177 33.87 4.5 0.75 BA 2 0.185 31.35 4.70 0.81 BSF 3/16 0.1875 32 4.76 0.79 BSW 3/16 0.1875 24 4.76 1.06 MF 5 0.197 50.80 5 0.5 M 5 0.197 31.75 5 0.8 BA 1 0.2067 28.25 5.25 0.90 BSW 7/32 0.21875 24 5.56 1.06

BA British Association BSF British Standard Fine BSW British Standard Whitworth M Metric Coarse MF Metric Fine UNC Unified Coarse UNEF Unified Extra Fine UNF Unified Fine

TPI Threads Per Inch

Reply to
Matty F

Excellent - just what I need. Many thanks.

Reply to
rrh

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