I'm restoring an old car and need to identify some threads but i can't seem to find and info on thread sizes and some threads are actually in the car bodywork so can't be taken to a shop and matched. Has anyone got any thread sizing charts, or know where i can download them from. I mainly need the overall diameters and tpi (threads per inch).
I've also got some pipe fittings running through the chassis rails that need new fitting and these need identifiying insitu also.
Some way also me metric as they have been altered in the past.
Any help much appriciated
2007-11-21 08:13:18 · 11 answers · asked by jbenny1 1 in Cars & Transportation ➔ Maintenance & Repairs
Steve k has got it exactly right. Every apprentice in my day was encouraged to buy one. It has every detail you need regarding diameter, tpi, drilling size, everything. They can still be bought at most good engineering suppliers.
A must for someone in your situation.
2007-11-21 09:07:05 · answer #1 · answered by firebobby 7 · 2⤊ 0⤋
Up to the 1950' - ish British car threads were BSF. British threads were based on the diameter of the bolt, American ones were measured across the flats of the nut. Some Austin/Morris engines were American but the chassis was British!
Some Morris cars before the war were a bastardised BSF in that they had two more threads per inch than BSF of a similar diameter.
Buy a few nuts and bolts on the web and simply try them for size.
BTW Pipe threads used for brake pipes and petrol lines were and remain copper BSP so you should not have problems there.
RoyS
2007-11-22 01:19:36 · answer #2 · answered by Anonymous · 0⤊ 0⤋
You can buy thread pitch gauges which will allow you to measure the no. of threads per inch or mm. Once that is known, use a sizing chart and the diameter becomes fairly apparent. Sears has the screw pitch gauges and sizing charts.
2007-11-21 08:20:41 · answer #3 · answered by mustanger 7 · 0⤊ 0⤋
Take a look here, this uys covered all the bases, use the arrows to scroll through the sizes, the UNC, UNF, BA, BSP etc etc.
Bolts on an old car will be UNC, UNF or BA.
http://www.colinusher.info/Livesteam/mewdata.html
2007-11-21 21:05:15 · answer #4 · answered by Steven N 4 · 0⤊ 0⤋
You need a book called the mechanical engineering handbook. It has all the info you need. It's about 2 inches thick it has so much info.
Try the library, if there isn't one in the branch, they will get one for you to borrow.
If there's a local college with technical courses, they may have one in their library. You can then photocopy the relevant pages.
2007-11-21 08:25:26 · answer #5 · answered by efes_haze 5 · 0⤊ 0⤋
What you need is a set of thread pitch gauges. You can normally get them from machine shops.
Ja.
2007-11-22 01:27:07 · answer #6 · answered by Anonymous · 0⤊ 0⤋
you can buy a thread gauge and measure the thread should be able to pick one up on www.blackwoods.com.au and your pipe threads can be measured the same hope this helps you out
2007-11-21 08:29:15 · answer #7 · answered by L J 2 · 0⤊ 0⤋
Why don't you go on the website of the type of car you are restoring and ask them the question? Just google it to find the site
2007-11-21 14:19:42 · answer #8 · answered by Pepper of the Moon 6 · 1⤊ 0⤋
As Stevek said and I only repeat to endorse - get the Zeus book. Google it and you will find one easy enough. These are invaluable little books and cost next to naff all,
2007-11-21 09:03:18 · answer #9 · answered by ShuggieMac 5 · 1⤊ 0⤋
http://msxml.excite.com/info.xcite/search/web/thread%2Bsizes
2007-11-21 08:51:21 · answer #10 · answered by tronary 7 · 0⤊ 0⤋