Bolt/screw thread gauge

Post by **rayofleamington** » Thu Oct 13, 2005 9:15 am

Why have wing bolts disappeared from Monty?

Maybe the mice carried them off for their own car?
I left a small pile of them on a chassis leg (when the car was on the roller) and forgot to bag them before putting the car down and back up again. - I never found all of them.
The head snapped of one (i got the rest out of the captive nut though

) and another couple were pretty rusted.

I also never found the missing rear spring shackle plate, a small screwdriver and a few other things. Now I think of it, the mice MUST be doing their own resto job - can't wait until I find out where they've hidden their car (it could be in the garage behind all my junk) ;)

Post by **wibble_puppy** » Thu Oct 13, 2005 11:46 am

mice, huh?

always borrowing tools without asking - and they don't clean them after using 'em either

Post by **woo** » Thu Oct 13, 2005 12:25 pm

If you own a reasonable vernier gauge you can identify a bolt/set screw by the diameter of the Head across the flats. This is possible since the formulae for head size is different for each thread type.

This site has a handy table you can use: http://www.team.net/sol/tech/SpannerSize.html

Using this chart you won't need to bother about Threads and Pitch per inch.

Robin

Post by **Chris Morley** » Thu Oct 13, 2005 1:51 pm

That's a very handy link Robin!

Post by **bigginger** » Thu Oct 13, 2005 2:07 pm

Yup - added to 'Favo(U)rites' yesterday!

Post by **Alec** » Thu Oct 13, 2005 7:26 pm

Hello Juliet,

this is strange as I'm sure I replied?

Thread gauges are purely Imperial or Metric and are just used to check the T.P.I. or t.p.mm not the thread form so an Imperial gauge will measure whit, BSF, UNC, UNF, B.A., BSP .

I can't comment on the best but if you have a good engineering supplier in your locality, that is easiest. People like Namrick or Bernard F. Wade can help. I don't know their addresses offhand but if you can't find them easily drop me a pm and I'll assist.

Alec

Post by **woo** » Thu Oct 13, 2005 7:43 pm

Along with the chart on my previous post, another chart I came across at the same time when I was looking into Nuts and Bolts a couple of years ago is on:

http://www.gomog.com/allmorgan/whitworth.html

At the foot of the document, which is interesting in itself, is a link to "Whitworth Comparison File" which displays the same data as my previous url but set out in a format which is easier to read.

Robin

Post by **bigginger** » Thu Oct 13, 2005 8:01 pm

10/10 A++ again

Post by **wibble_puppy** » Thu Oct 13, 2005 8:12 pm

wahey! totally excellent links, thank you very much woo, particularly like that second one

Respect is due to someone who can write so clearly - and get in the word "furtling"

thanks again for your help, alec, it's getting clearer, no doubt i'll be in touch when floundering

juliet xxxxxx

Post by **simmitc** » Fri Oct 14, 2005 1:12 pm

I've always found http://www.namrick.co.uk/ to be an extremely good source. Browse the pages and you'l find machine screws, bolts, washers, castle nuts, dome nuts, hex nuts, half nuts (They're used on the rear axle U-bolts, Juliet, and also to hold the carb on, they're thinner than a full nut but have the same thread) and all sorts of other goodies including the Zeus book and thread gauges. Happy buying.

Post by **wibble_puppy** » Fri Oct 14, 2005 4:34 pm

thank you very much, simmitc!