Im trying to find the correct name for a type of machine screw (for eBay/online shopping searches).

It has a head like a carriage bolt (large pan, say 20mm in diameter, but only 5mm thick in the middle and tapering to a thin circumference), but without the square top to the shank. A combi slot in the top (slot/posi), M8 thread from the top of the shank and about 20mm long.

anyone?

Like a flatter button head?

bigger diameter. Not necc much flatter.

Its a “Truss” according to this american thingy.

But I cant seem to find any in UK

Are you offering, Stoner?

here we are

http://www.trfastenings.com/pages/JIS+Phillips+Truss+Head

now, where to buy?!

mollie – in this instance Im a taker, not a giver.

I sometimes see button head screws with wider bases – they look like they’ve got washers under them but it’s integral. Not in M8, though. Button head with a washer?

I may end up having to use a pan head machine screw and washer, but was hoping to keep a lower profile.

Ah, those – I’m sure I found some at B&Q for something…

Stigs fasteners have been good when I’ve wanted stuff

The thing your after looks a lot like a B&Q roofing bolt but they are for a flat head screw driver.

probably not in M8 though ben.

They had them in M8 last weekend…

cheers igm, these might do it:

http://www.a2stainless.co.uk/M8-x-20-Hex-Socket-Flange-Button-Screw_ADQS.aspx?nh=2

EDIT: igm, in B&Q you mean?

It sounds like a roofing bolt, the sort of thing to hold corrugated sheet to metal rafters / trusses

Moses, I love you.

http://www.ebay.co.uk/itm/10-PACK-M8-X-80-ROOFING-BOLTS-NUTS-MUSHROOM-HEAD-ZINC-GUTTER-FENCE-ETC-/170923718522?pt=UK_DIY_Material_Nails_Fixing_MJ&hash=item27cbd8f77a

Yep B&Q had M8 roofing bolts, but they were slotted not Allen / Phillips / Pozidrive

I use these flat head furniture bolts quite a lot. Neat and flat. Usually m6 but you can get other sizes.