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BS 5S 21:1964
M00000186
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BS 5S 21:1964 Specification for aircraft material. '20' carbon steel (suitable for welding) (25/35 tonf/sq in: maximum size 6 inches diameter or minor sectional dimension)
standard by BSI Group, 01/31/1964
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Cross References:
BS 350
3S 100
Replaces BS 4S 21:1949.