B50 cylinder head nuts

[Dave Halsall]

Good evening  would  anyone  be able to  tell me if l can use 7/16 nuts for  the cylinder head  of 5/8 AF spanner  size ( fo ease of getting  a ring  spanner  for ease of access) instead  of the 11/16 AF Spanner size.
I gather  the larger size  gives better  clamping  force but  with  the thick  washers  would this  make any difference.
Many thanks for any  suggestions
Dave

[Rupert]

What you suggest is feasible but as far as I'm aware there are no off-the- shelf unf nuts of that description.
It would be fairly simple to make some on a lathe starting with 5/8" a/f hex bar.
You would then be able to make the underside flat rather than chamfered which would help to spread the load over a wide area of the washer.

[Dave Halsall]

What you suggest is feasible but as far as I'm aware there are no off-the- shelf unf nuts of that description.
It would be fairly simple to make some on a lathe starting with 5/8" a/f hex bar.
You would then be able to make the underside flat rather than chamfered which would help to spread the load over a wide area of the washer.

What you suggest is feasible but as far as I'm aware there are no off-the- shelf unf nuts of that description.
It would be fairly simple to make some on a lathe starting with 5/8" a/f hex bar.
You would then be able to make the underside flat rather than chamfered which would help to spread the load over a wide area of the washer.

Thanks for your response nuts of 7/16  are available but  not  sure  of where they came from, my mate  has a small engineering  firm and  let me have  some.  However  l can find  out  hopefully  where these came from.
And l will try  and  give  details.
With this in mind I can assume  its OK to use these nuts rather  than the 11/16 size.
Thanks again for your help  it's greatly appreciated

[DAVE BRADY]

Hi,

Is it worth modifying a ring spanner to fit better? Grinding off just a bit can make all the difference to the ease of use without really weakening it.  The torque required is not too great so a reasonable quality spanner would do.

Dave.

[DAVE BRADY]

Hi,

Another thought.  Are they the same thread as late A65 cylinder 12 point base nuts? Or is that type of nut available in the correct size?

Dave.

[Dave Halsall]

Hi,

Another thought.  Are they the same thread as late A65 cylinder 12 point base nuts? Or is that type of nut available in the correct size?

Dave.

Thanks  Dave I am not  sure  on that  perhaps  they are and  l will look  in to that.
But  maybe  better to better  to use the correct proper  size  nuts and  grind a spanner  to suit.
Much appreciated for your help