Author Topic: thread sizes  (Read 1030 times)

andy

  • Guest
thread sizes
« on: 24.10. 2009 18:48 »
where can i get a list of thread sizes and pitches for the A7 engine and other bits ???? EG:- this bolt is a 3/8ths dia and 24TPI cycle thread.  as i have lots of taps and dies as i used to be a tool setter/engineer and i inherited a few from a uncle who did model making. thanks in advance.ANDY.
Good Advice
0
No reactions

Online muskrat

  • Global Moderator
  • Wise & Enlightened
  • **
  • Join Date: Jul 2009
  • Posts: 8431
  • Karma: 111
  • Lithgow NSW Oz
    • Shoalhaven Classic Motorcycle Club Inc
Re: thread sizes
« Reply #1 on: 24.10. 2009 19:32 »
G'day Andy, you will find most of the threads are 26 tpi 55* cycle thread which is similar to brass thread but dif angle 60*. Some BSF thread for head bolts, rear sprocket studs etc. Most studs are whit/cyc. Then throw in a few BA screws and whit cover (timing, primary, g/box) screws. Pretty sure a member posted a list not long back.
Cheers
Good Advice
0
No reactions
'51 A7 plunger, '57 A7SS now A10CR,  '83 CB1100F, 88 FXST .
Australia
Muskys Plunger A7

Online groily

  • Wise & Enlightened
  • *
  • Join Date: Jul 2007
  • Posts: 1118
  • Karma: 18
    • www.brightsparkmagnetos.com
Re: thread sizes
« Reply #2 on: 24.10. 2009 22:45 »
Hi Andy,
If you look at, for example, mdmetric.com (there be others) you'll see pretty well all sizes and forms listed most helpfully with diagrams etc as well. 3/8 24 is UNF not Cycle. UNC/F are 60 degrees, as is metric and Cycle. BSF and WW and Brass are 'whitform' and 55 degrees. BA is 47.5 and mostly confined to electrical kit. Most Cycle stuff is 26tpi, with 20 tpi options in larger sizes. You'll also meet BSP/Gas threads, for fuel taps etc. 1/8th and 1/4 are the usual ones. Tracy Tools in Devon can supply pretty well all threading tackle ever needed if your stock doesn't cover it already!
Good Advice
0
No reactions
Bill

Online trevinoz

  • Newcastle, N.S.W. Australia.
  • Wise & Enlightened
  • *
  • Join Date: Jul 2006
  • Posts: 2917
  • Karma: 67
Re: thread sizes
« Reply #3 on: 25.10. 2009 00:08 »
Andy,
           I posted my list under the topic "Bolts" in Stories and Chat.
  Trev.
Good Advice
0
No reactions

Offline Josh Cox

  • Valued Contributor
  • ****
  • Join Date: Apr 2009
  • Posts: 275
  • Karma: 0
Good Advice
0
No reactions
Black 1953 Golden Flash Plunger

Offline olev

  • Brisbane, Australia
  • Resident Legend
  • *****
  • Join Date: Sep 2008
  • Posts: 517
  • Karma: 3
Re: thread sizes
« Reply #5 on: 25.10. 2009 08:40 »
Good Advice
0
No reactions

Offline BSA_54A10

  • Wise & Enlightened
  • *
  • Join Date: May 2008
  • Posts: 2030
  • Karma: 32
    • BSA National
Re: thread sizes
« Reply #6 on: 25.10. 2009 11:33 »
The Stainless bits list is also on the BSA Bantam Yahoo group ( in the files section) as an excel spread sheet so it can be searched.
Good Advice
0
No reactions
Bike Beesa
Trevor