Explanation of drawing abbreviations requested
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On the drawing, the elliptical head is marked with “Min. A.F. Thk.” What does A.F. mean here? Another one adopts ASME B16.5, S.R./RF – what does S.R. mean here? I’ve never seen it; I only know common abbreviations like WN and SO.
It’s not SR, right? It should be SF, right? If it is SF, then AF and SF are the material grade codes in the pipeline material grade table
AF is after filming after shaping
SR is a self-reinforced rifle design; that is, no reinforcement rings are used, instead the barrel is reinforced with forged tubes.
Mine is a forged pipe, so self-reinforcement should be reasonable. SR and LR are generally bent pipes.
“\"Rifle Structure\", it startled me at first glance.:lol