M3 ; thread pitch 0.5mm, spanner size 5.5mm. M4 ; thread pitch 0.7mm, spanner size 7mm. M5 ; thread pitch 0.8mm, spanner size 8mm. M6 ; thread pitch 1.0mm, spanner size 10mm. M8 ; thread pitch 1.25mm, spanner size 13mm.
DOME NUTS METRIC A4 MARINE GRADE STAINLESS STEEL M3 M4 M5 M6 M8 M10 M12 M16
UNF DOME NUTS A2 STAINLESS STEEL HEX ACORN 10 1/4" 5/16" 3/8" 1/2" 5/8" 1/2"
HEX Dome Nuts A2 Stainless Steel ACORN DOMED CAP NUT M3 - M8 M10 M12 M14 M16 M20
SOLID BRASS DOME NUTS HEXAGON DOME NUT FOR METRIC SCREWS M4 M5 M6 M8 M10 M12
SOLID BRASS DOME NUTS FOR METRIC BOLTS & SCREWS M3 M4 M5 M6 M8 M10 M12
M3 M4 M5 M6 M8 DOME NUTS DOMED HEXAGON METRIC A4 MARINE GRADE STAINLESS STEEL