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
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.
Quote from: Rupert on 24 Jun, 2025, 21:01 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.
Quote from: Rupert on 24 Jun, 2025, 21:01 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
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.
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.
Quote from: DAVE BRADY on 27 Jun, 2025, 11:06 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