[Frank Erskine]

On Tue, 26 Jun 2012 22:17:39 +0100, "Jim Hawkins"
wrote:

Justin C wrote:
On 2012-06-15, Brian Reay. wrote:
"Justin C" wrote in message
...
I need to buy some bolts to replace some rusted and
corroded. The bolts I have hexagonal heads and a smooth
shank from the head to about halfway down, where the thread
starts.

Looking online I find most bolts have a thread from the
head all the way down, this isn't what I want.

Also, I only need to buy three, can anyone recommend
somewhere I can buy bolts in small numbers, these are 9mm
by 50mm A2 stainless, and not cheap (I've found 9mm x 50mm
threaded all the way at about £85/100, I definitely don't
want to by 100 when I only need three!).

As others have pointed out, you are after bolts.


I think those with thread all the way down are called 'set screws',
though I have no idea why.

Set screws are totally different.

--
Frank Erskine

[[email protected]]

On Monday, June 25, 2012 7:21:57 PM UTC+1, Justin C wrote:

Thanks for the reply, you've made me double check my
measurements. It's not easy when they've suffered crevice
corrosion (the leak was fixed last year, but I didn't
replace the bolts at the time).

The digital callipers say they're 0.3715"... or about
9.43mm. That's not M9, nor is it 3/8" which should be 0.375
decimal inches (decimal inches?! the mind boggles). I'm
guessing that 3/8 is what they are and either the callipers
are out or these were cheap bolts.

Actually that sounds pretty close to me - I think the tolerance on the major diameter is about .007" for medium fit (which is the tightest tolerance recommended for bolts under 3/4"). That means the diameter could be between 0.375 and 0.367 inches.

[Frank Erskine]

On 27 Jun 2012 21:23:58 GMT, Huge wrote:

On 2012-06-26, Jim Hawkins wrote:
Justin C wrote:
On 2012-06-15, Brian Reay. wrote:
"Justin C" wrote in message
...
I need to buy some bolts to replace some rusted and
corroded. The bolts I have hexagonal heads and a smooth
shank from the head to about halfway down, where the thread
starts.

Looking online I find most bolts have a thread from the
head all the way down, this isn't what I want.

Also, I only need to buy three, can anyone recommend
somewhere I can buy bolts in small numbers, these are 9mm
by 50mm A2 stainless, and not cheap (I've found 9mm x 50mm
threaded all the way at about £85/100, I definitely don't
want to by 100 when I only need three!).

As others have pointed out, you are after bolts.


I think those with thread all the way down are called 'set screws',

Machine screw. You're welcome.

I've heard of bolts which are partially threaded described as having
so much "wood", that is, say 2" of unthreaded shank would be described
as '2" wood', the idea being that often such a shank would pass
through a piece of wood being attached to, typically some sort of
metal fixture.

--
Frank Erskine

[Rod Speed]

"Frank Erskine" wrote in message
...
On 27 Jun 2012 21:23:58 GMT, Huge wrote:

On 2012-06-26, Jim Hawkins wrote:
Justin C wrote:
On 2012-06-15, Brian Reay. wrote:
"Justin C" wrote in message
...
I need to buy some bolts to replace some rusted and
corroded. The bolts I have hexagonal heads and a smooth
shank from the head to about halfway down, where the thread
starts.

Looking online I find most bolts have a thread from the
head all the way down, this isn't what I want.

Also, I only need to buy three, can anyone recommend
somewhere I can buy bolts in small numbers, these are 9mm
by 50mm A2 stainless, and not cheap (I've found 9mm x 50mm
threaded all the way at about £85/100, I definitely don't
want to by 100 when I only need three!).

As others have pointed out, you are after bolts.


I think those with thread all the way down are called 'set screws',

Machine screw. You're welcome.

I've heard of bolts which are partially threaded described as having
so much "wood", that is, say 2" of unthreaded shank would be described
as '2" wood', the idea being that often such a shank would pass
through a piece of wood being attached to, typically some sort of
metal fixture.

In fact even bolts that arent used with any wood at all
arent normally threaded all the way up to the head.

[Dave Plowman (News)]

In article ,
Rod Speed wrote:
In fact even bolts that arent used with any wood at all
arent normally threaded all the way up to the head.

Who cares if they get this wrong in Oz - as so much else?

This is a UK group, and a bolt is a bolt here. Not a machine screw.

--
*If you try to fail and succeed, which have you done? *

Dave Plowman London SW
To e-mail, change noise into sound.

[Rod Speed]

"Dave Plowman (News)" wrote in message
...
In article ,
Rod Speed wrote:
In fact even bolts that arent used with any wood at all
arent normally threaded all the way up to the head.

Who cares if they get this wrong in Oz - as so much else?

This is a UK group, and a bolt is a bolt here. Not a machine screw.

And most arent threaded all the way up to the head
with the bigger bolts even on that soggy little island.

[Justin C[_12_]]

On 2012-06-27, wrote:
On Monday, June 25, 2012 7:21:57 PM UTC+1, Justin C wrote:

Thanks for the reply, you've made me double check my
measurements. It's not easy when they've suffered crevice
corrosion (the leak was fixed last year, but I didn't
replace the bolts at the time).

The digital callipers say they're 0.3715"... or about
9.43mm. That's not M9, nor is it 3/8" which should be 0.375
decimal inches (decimal inches?! the mind boggles). I'm
guessing that 3/8 is what they are and either the callipers
are out or these were cheap bolts.

Actually that sounds pretty close to me - I think the tolerance on the major diameter is about .007" for medium fit (which is the tightest tolerance recommended for bolts under 3/4"). That means the diameter could be between 0.375 and 0.367 inches.

That's useful to know. Thank you.

Westfield Fastners were quick to deliver and I'm over to
the boat tomorrow so shall install them then - if they fit!

Justin.