yes I work with many codes, but I am talking in general. I am looking for engineering data or for those you can talk from experience what are common shop pratices for what I am refering to, if there are codes to what I am refering to please I want to know any and all codes which I can refer to. I understand it may not matter in some applications, but I am looking for refrences where it does matter and it is restricted and even if it is not restricted where it is sound recommended pratice and advantageous to stay within certain limits.