International Standard Comparative

BSI No. :: UNS No.

British Standards Institution :: Unified Numbering Systems for Metals and Alloys


BSI Group, also known in its home market as the British Standards Institution (or BSI), is a multinational business services provider whose principal activity is the production of standards and the supply of standards-related services. BSI produces British Standards, and, as the UK’s National Standards Body, is also responsible for the UK publication, in English, of international and European standards. The Group now operates internationally in 150 countries.


The UNS for Metals and Alloys provides a means of correlating many internationally used metal and alloy numbering systems administered by societies, trade associations, and individual users and producers of metals and alloys. Jointly developed by ASTM International and the Society of Automotive Engineers (SAE), it provides the uniformity necessary for efficient indexing, record keeping, data storage and retrieval, and cross-referencing.

Comparative Table5


B/- Council for Building and Civil Engineering C/- Chemical and Health Council
E/- Engineering Council L/- British Electrotechnical Committee and Electrotechnical Council
M/- Multitechnics Council S/- Systems : Management And Environment T/- Disc
BS No.&title BS Grade UNS&etc Spec   BS No.&title BS Grade UNS&etc Spec
BS970 Part 2

BS 970

835M     805A15  
897M     805A17  
905M     805H17  
905M     805M17  
945M     805A20 G87200
945A     805H20 H86200
Part 3
Bright bars for general engineering purposes


  805M20 G86200
523M15 G51550   805A22 G86220
527A19     805H22 H86220
527A60 G51150/font>   805M22 G86220
527M17     805A24  
527M20     805H25  
635A14     805M25  
635H15     815A16  
635M15     815H17  
637A16     815M17  
637H17     820A16  
637M17     820H17  
655A12     820M17  
655H13     822A17  
655M13     822H17  
659A15     822M17  
659H15     832H13  
659M15     832M13  
665A17     835A15  
665H17     835H15  
665M17     835M15  
665A19     302S21  
665H20   Part 4
Valve steels
302S25 S30200
665M20   303S41 S30323
665A22   304S11 S30403
665H23   304S31 S30400
665M23   310S24 S31000


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