[TowerTalk] 4130 Chrome-Moly Grades

[Ron Hylton]

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?

73,
Ron  AD7L
Hillsboro, Oregon