Size picker · Hex socket drive · ISO 7380-2
Flanged button head sizes.
A button head with a built-in flange — the washer is part of the screw. Pick a diameter and length for the head and flange diameters, the key size, and the grade.
1 Pick a diameter
2 Pick a length
Choose a diameter first.
Your browser could not draw the 3D view. The dimensions beside it are unaffected.
Drawn to proportion from the standard dimensions. Illustration, not a photograph of the item.
Selected
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| Sym | Dimension | Value |
|---|
Job stopped? Ring 01327 877577 and we'll check the stock while you're on.
Read the full ISO 7380-2 size chart
| Size | 3 | 4 | 5 | 6 | 8 | 10 | 12 | 14 | 16 | 18 | 20 | 25 | 30 | 35 | 40 | 45 | 50 | 60 | 65 | 70 | 75 | 80 | 90 | 100 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| M3 | ||||||||||||||||||||||||
| M4 | ||||||||||||||||||||||||
| M5 | ||||||||||||||||||||||||
| M6 | ||||||||||||||||||||||||
| M8 | ||||||||||||||||||||||||
| M10 |
The range shown is what fastener wholesalers commonly list — not a claim about what the standard mandates, and not a stock list. In-between lengths (85, 95, 170…), lengths past 300mm and odd diameters like M7 are made too, and availability varies by finish and grade — ask us for anything you can't see.
The washer you cannot lose
The flange spreads the clamping load over a wider face, which matters on sheet, plastics and slotted holes. It also takes a step out of the build: no washer to hold, drop or forget. The dome itself is smaller than a plain button head of the same thread — the flange carries the bearing face instead.
Same drive and same class as the plain button head (10.9), and the same shallow socket, so treat the key the same way.
Not sure which you need?
Bring the old one in — Baird Close, Daventry.
More size charts
Every size, drawn to scale.
Hex setscrews
DIN 933 · full thread
Hex bolts
DIN 931 · part thread
Socket cap screws
DIN 912
Low head cap screws
DIN 7984
Button head screws
ISO 7380-1
Countersunk socket screws
DIN 7991
Grub screws
DIN 913–916 · five points
Nuts
DIN 934 · nyloc · thin · Stover · flange
Washers
ISO 7089 · BS 4320 · penny
Not sure what the markings on the head mean? Bolt grades explained covers 8.8, 10.9, 12.9, stainless A2 and A4, and the imperial SAE grades.
All of it comes off the shelf at Baird Close — see the full fasteners & fixings range, or every size guide.