Here in the Portland metro area, we have an excellent source of tubing from
a company called Tube Service. They offer several grades of 4130 alloy
Chrome-Moly tube, including:
4130 Airframe (Cond. N) Specs: Mil-T-6736, AMS 6360
4130 Aircraft (CDSR) Specs: AMS-6371
4130 Commercial Specs: ASTM A-519
My question is, which grade is typically used for masts?
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