Bolt Size Chart

[Windy Miller]

Evening All!

I need to find a bolt to fit a tapped hole, and I am having trouble finding an easy to understand bolt size chart.

The hole measures 22mm dia (between the threads) and it looks to be a fairly coarse thread. The only thread gauges I have that come anywhere near the pitch are an old Whitworth set, and the best fit is 8 - I guess thats 8 tpi?

Any clues as to the size of the bolt I need? Can anyone point me to a thread chart website please?

There is going to be very little stress on this fixture, so if it's not exactly right it's not a big deal - as long as I can loosely screw it in a few turns and it won't fall off that would be OK!

It's for a solid steel cone about 6" dia base tapering to more or less nothing, and about 12" or so high. I want to weld a tapered square bar to the bolt so it will fit in the hardy hole on the anvil to true up roundish forged rings. It could probably just sit there on the anvil without any fittings, but if it fell off it's heavy enough to hurt. A lot!

I want to use the bolt & bar scenario rather than a bar welded straight to the cone, as sometimes it's handy to just sit it straight on the bench.

Any suggestions?

 

[ford34/2]

Threads

any ideas on the age of your CONE component.??

Stan

 

[Tino]

Try here http://www.britishfasteners.com/threads/bsc.html

 

[Paul G]

Looks like you have answered your own question.

1" BSW is indeed 8 tpi with a tapping size of 22mm


Cheers
Paul G

 

[Windy Miller]

Looks like you have answered your own question.

1" BSW is indeed 8 tpi with a tapping size of 22mm


Cheers
Paul G

Ah Ha! As simple as that! Cheers Paul that is very helpful

I would have thought that this size bolt is far less common nowadays, so not the sort of thing that I would find at Screwfix or the like. Can anyone suggest a supplier that would sell me just a couple of bolts? I'm sure there are specialist bolt suppliers but I don't want to buy dozens of them - 3 or 4 would be plenty for my needs!

Once again thanks all for your input!

 

[Shox Dr]

Try Hardware and Fasteners Not much he doesn't have

 

[ford34/2]

whitworth

I can thread you a couple of bits of steel bar, if thats any good?? 1" X 8 Whitworth.

FOC

Stan

 

[Windy Miller]

I can thread you a couple of bits of steel bar, if thats any good?? 1" X 8 Whitworth.

FOC

Stan

Thank you very much for your offer Stan - that's very decent of you!

I don't want to put you to any needless trouble, so I'll have a look at Shox Dr's link and see what there is available, but if I don't have any luck I'll give you a shout.

Yet another example of what a thoroughly nice bunch of blokes there are on this forum! Thanks Again!

 

[Shox Dr]

I'd call Stuart, I doubt it will be on the site. If I remember I'll call in on Monday morning, it's only 600yds down the rd

 

[Windy Miller]

I'd call Stuart, I doubt it will be on the site. If I remember I'll call in on Monday morning, it's only 600yds down the rd

What a Gent - Thanks very much!

 

[Shox Dr]

tapered or parallel? Parallel I would have thought

 

[Windy Miller]

tapered or parallel? Parallel I would have thought

Hmmm I'm not sure, but I would think parallel.

I have no idea what the cone was originally made for, or how old it is. I picked it up for a fiver or so at a boot fair last year. I'll post up some pics when it's done. Maybe somebody can tell me what it is for!

 

[ford34/2]

whitworth

sent you a pm with some options.
--no prob

Stan

 

[Windy Miller]

sent you a pm with some options.
--no prob

Stan

Thanks Stan! Pm relied!

 

[ford34/2]

update

you get fixed up??

Stan

 

[Shox Dr]

Sorry H&F can't help. They don't stock any BSP

 

[Windy Miller]

Well I called the Guy that Shox Dr suggested and he DOES have some in stock (BSW not BSP!), but I was a litte surprised at the cost. I thought I would buy 3 bolts just in case summat went wrong somewhere, and it came to £48!!! I guess if I just bought 1 it would be far more bearable (£14 + £6 postage), but Stan has thrown a bit of a spanner in the works with his suggestion (in a pm), that it could possibly be a Metric 24 X 3.

I think I'll try to find a coarse metric bolt and see if that fits before I commit to either buying one from H&F or taking Stan up on his kind offer, as I'd hate to waste anyone's time and/or money buy getting the wrong one!

I finished work early this evening, so I can go and play in the garage for a while

Watch this space...

 

[Shox Dr]

Well I called the Guy that Shox Dr suggested and he DOES have some in stock (BSW not BSP!),

doh. I'll speak to him if you want I'll get a lot more discount than yourself I'd say. Let me know how it pans out

 

[ford34/2]

update

PRICE---was that for exotic metal?? mine just be mild steel!! Ha,

The whitworth 1" X 8 OD is 1"
Core is .8399 and the pitch would be .125 ( 8 per inch)

The Metric 24 X 3 OD is .945
Core is .7915 and the pitch would be .1181 (almost 8.5 per inch)

The core would be, the approx ID of a nut. and UNC is almost Whitworth.
the two threads also differ, the whitworth is 55 Degrees, and the metric is 60 degrees.
why is life so complicated.

Stan

The fairly obvious, if its oldish its probably Whitworth, if its newish -Metric. So your original 22mm hole is a lot nearer to the whitworth,.8399 near to 21.33mm
the metric .7915 is only- about 20.1mm

I THINK

 

[Windy Miller]

Blimey - more confusion! Why is this getting so complicated?

Well I've been out and had another measure up, and it consistently comes up with an internal dia of 22.01mm, and the 8tpi whitworth thread gauge fits nicely, so I'm confident that whatever the type of thread it is, it's 8tpi! I'm not sure I could tell if it was 60* or 55* though - I cant see down in the hole that well.

22.01mm translates to 0.866", so maybe it could be a 1" UNC thread afterall?

Rather than mess people about helping me out on this, I think I'll find a UNC and a metric bolt and see how I get on with them. If they don't fit, then it's likely to be the 1" Whit. I think. Unless it's a badly cut thread which is why it was at the boot fair in the first place!

Whils I was scouring the garage for suitable things to try, I found that I can get it in a few turns with an old Argon regulator. It's obviously not the right thread, but it was nice to find something that sort of fitted!

Thanks for all your help and ideas Guys - hopefully I'll get somewhere with it soon!