If I can find out what type of metal (or an equivalent metal) they were made of I'm about 75-percent sure I can make a safe working copy of a Lee Enfield bolt head Threads for the SMLE Boltheads are diameter.
While resistant to compression the cast heads have less shear strength than steels. The M marked boltheads are Cast Iron, the M stands for "Mild Steel" but White Cast Iron is listed as mild steel in British metallurgy hand books. So its likely this steel was used for the contemporay No.4 boltheads. "Head, breech bolt - Steel B.S.S.5005/103 - Case hardened and polished" The Specs for the SMLE boltheads made from 1938 onwards were I don't know if other metals or alloys were used for the No.4 but I suspect simple cast steel may have been used as well. This metal also has an unusual ability to old lubricants like a bearing, which reduced thread wear. The SMLE specs called for No.34F Special Gun Iron, a very pure malleable "white" cast iron with an extremely high resistance to compression. Anyone know what the thread pattern is on the tail end of these Bolt-Heads? I had to come back and edit this post cause I almost forgot to ask something else pertaining to these Lee Enfield Bolt-Heads. If possible, I'm just looking for straight answers and maybe some insight on the manufacturing technique used to make these little gizmos. I know there are alot of guys here that have alot of smarts when it comes to the Lee Enfield. If I can find out what type of metal (or an equivalent metal) they were made of I'm about 75-percent sure I can make a safe working copy of a Lee Enfield bolt head. These guns were made in so many different places that it stands to reason that the specs on them would differ greatly. It seems that in my search for one of the right length, the longest one I could find measured short and it has the #3 stamped on it. Do any of you more knowledgeable Enfield guys know what type of metal was used to make the Bolt-Heads on the Enfield No.4's?
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