M6 x 70mm flat head phillips screw in 316

[ncp]

Need 8 of these with washers w/ nuts.

Thought about trying to substitute 1/4-20 x 2.75" (At the the suggestion of Willard since this is what they use now). The problem with the SAE screw is the that the head is bigger and they don't fit in the countersunk spot. (see pic, note how one doesn't sit flush).

Also, already found them in 18-8 stainless (from what I've read, just below 304 quality) but would like to find 316 since they're holding my elephant trunks on and are in the water.

Thanks

[ncp]

[Bigtalljv]

Hit the flange with a countersink to fit the new size screw?

[nugent]

Originally Posted by Bigtalljv

Hit the flange with a countersink to fit the new size screw?

Wot e said

[ncp]

Originally Posted by Bigtalljv

Hit the flange with a countersink to fit the new size screw?

When I got my stainless swim step made they dunked it in some sort of solution so that the welds wouldn't rust and keep it pretty. I don't know if that was done to that stainless ring (looks pretty good for 1994). But, which is the lesser of the two evils New countersink to expose virgin stainless of use lesser grade stainless screws?

The only reason I'm looking is because two of eight originals have mangled heads so I just assumed for a couple dollars that I could just replace the whole lot. It's never that simple...
(I don't have the bits to countersink either - I'd need to buy/borrow)

[Bigtalljv]

Countersink are cheap, just a couple bucks. Not sure about the rust. Isn't stainless like AL in that once the top oxidizes it's protected?

[jyasaki]

The nickel reacts pretty quick to oxygen; a matter of seconds (if that) if I recall right.

Exposing fresh SS to air isn't a problem. If it was, every metal to metal contact would leave a trail of rust.

jky