Thanks for your help

Hi Bruce and Radarsdesk,

Thank-you both for answering my question.

Interesting to read the historical evolution of bolt standards that you provided Radarsdesk. Reminds me for some reason of the troubles Packard had when manufacturing the Merlin- apparently that was quite a task.

You have confirmed what I suspected that the “E” in the RAF Stores Section and Reference Number designates this as 1/4″BSF.

Bruce, the Brown Brothers catalogue that you have scanned and posted is excellent, it tells me everything I need to know about BSF bolt and nut dimensions. Thanks for your generosity in scanning this.

Regards,