Small Flanged Hex Bolts

Small head indicates a smaller Spanners is used
M6
Head size M8
Head Thickness 5.5mm +/- 0.15mm
Flanges Dia 10.5 +0.5mm/-0mm
Flanges Thickness 1mm
Thread length 8-30mm full thread
Thread length 35-95mm =18mm
M8
Head size M10
Head Thickness 7mm +/- 0.15mm
Flanges Dia 14.5 +0.6mm/-0mm
Flanges Thickness 1.2mm
Thread length 14-45mm full thread
Thread length 50-95mm =22mm

How to measure
Measure from end of thread to under the head.