« previous next »
Pages: [1]   Go Down

Author Topic: BA threads and spanners  (Read 5400 times)

Offline AndyB

  • Full Member
  • ***
  • Posts: 192
  • Country: england
  • Cry 'god for Harry, England, and Drummond lathes'
BA threads and spanners
« on: August 07, 2011, 02:15:36 PM »
Hi all,

This has got me stumped!

Why is a BA thread size different to the spanner size?
I have been tapping 5BA threads with a 5BA tap and inserting 5BA studs but doing up the 5BA nuts with a 6BA spanner :bang:
I have got 2 sets of BA spanners made by different people (one King Dick) and they are the same!

Bound to be something simple :doh:

Andy
Logged
Waveney Valley, Suffolk/Norfolk Border

Offline DaveH

  • Hero Member
  • *****
  • Posts: 1413
  • Country: za
  • Kempton Park, South Africa
Re: BA threads and spanners
« Reply #1 on: August 07, 2011, 02:20:25 PM »
Small nuts :lol: :lol: :lol:

DaveH
Logged
(Ex Leicester, Thurmaston, Ashby De La Zouch.)

Offline Jasonb

  • Sr. Member
  • ****
  • Posts: 451
  • Country: gb
Re: BA threads and spanners
« Reply #2 on: August 07, 2011, 02:25:24 PM »
Yep small nuts.

For a more scale appearance you can by BA fisings in whats known as "one size smaller" where the hex is from the next size down the scale so 5BA thread has 6BA Hex, 2 BA thread has 3BA hex etc.

J
Logged

Offline AndyB

  • Full Member
  • ***
  • Posts: 192
  • Country: england
  • Cry 'god for Harry, England, and Drummond lathes'
Re: BA threads and spanners
« Reply #3 on: August 11, 2011, 03:48:11 PM »
Funny...

That's just what the wife says... :lol: :lol: :lol:

Thanks Jason. The nut size does look in proportion to the thread size  :scratch:
Logged
Waveney Valley, Suffolk/Norfolk Border
Pages: [1]   Go Up
« previous next »