Would a pan head do the trick?

It would be better than a hex head... it's for a handrail attachment plate.

Rather than think climate change and the corona virus as science, think of it as the wrath of God. Feel any better?

-Dik

dik - How about square head lag screws? It was a long time before I discovered lag screws had hex heads.

www.SlideRuleEra.net

I want something non-obtrusive for mounting the attachment plate to a wall. Have high loads... maybe look into longer #12 or #14 screws... I generally use lag screws for higher loads.

Rather than think climate change and the corona virus as science, think of it as the wrath of God. Feel any better?

-Dik

Decorative lag screws are available with both square and hex heads. This link if for the square head style.

www.SlideRuleEra.net

Thanks... nice to know; they are attractive and may find another use for them. I was thinking that the head would be an obstruction... that's the reason for the flat head, or maybe a panhead fastener.

Rather than think climate change and the corona virus as science, think of it as the wrath of God. Feel any better?

-Dik

You can get structural screws in larger diameters...if you can find the length you need. Some of the head designs are less obtrusive than hex head...

The GRK fasteners that jotunn posted are relatively clean-looking, and the local carpenters in my area often leave them exposed. You can also get them stainless if needed.

Thanks, gentlemen... I've asked the client what he wants. I suspect a long #12 or #14 with a flat or pan head.

Rather than think climate change and the corona virus as science, think of it as the wrath of God. Feel any better?

-Dik

You can counter-bore the wood so the head is below the surface. It's not very different than the countersink needed for a flat head. Don't forget the washer.

The steel plate will have countersunk part so the flat head will be flush with the top of the plate... thanks.

Rather than think climate change and the corona virus as science, think of it as the wrath of God. Feel any better?

-Dik

Dik:

I take it you've already looked at Simpson WSNTL or SDW flat head screws?

Regards,

DB

Yup... one of the first. I was looking for a more conventional 'flat head' profile', and was wondering if lag screws came in that type of shape. I've often use lag screws for solid connections and was thinking of something like them. The information I've passed on to the client is for using a large diameter 'conventional' wood screw. I can develop the loads with them. Thanks for the response... my problem is that I'm not normally into wood construction... I do have a penchant for timber framing, having done numerous reports on timber framed barn structures.

Rather than think climate change and the corona virus as science, think of it as the wrath of God. Feel any better?

-Dik

Dik:

Have you seen these? They might work better than wood screws and would have less prep work involved. Link

Regards, DB

NB: Plus they're fellow Canadians.

Thanks... I wasn't aware of these... and have forwarded the fastener type to 'my' wood guy... from the info...Wood/Wood, Wood/Concrete, Wood/Steel. I'll look into them, they seem to be pretty good.

Rather than think climate change and the corona virus as science, think of it as the wrath of God. Feel any better?

-Dik