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 Table4


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
BS 970 Part 1
805A22 G86220

BS970 Part 2

530A30 G51300
805H17   530A32 G51320
805H20 H86200④1.6523 530A36 G51350
805H22 H86220 530A40 G51400
805M17   530H32 H51300②5130H
805M20 G86200 530H36 H51350②5135H
805M22 G86220④1.6523 530H40 H51400②5140H
808H17   534A99  
808M17   535A99  
815H17   605M30  
815M17   605M36  
817A37 ④1.6565 605A32  
817A42 ④1.6545 605A37  
817M40 ④1.6582 605H32  
820H17   605H37  
820M17   606M36  
822H17   608M38  
822M17   608H37  
826M31 ④1.6743 608M40  
832H13 ④1.6657 640A35 G31350②3135
832M13 ④1.6657 640M31  
835H15 ④1.6723 653M31 G31400②3140
835M30 ④1.6723 708M40 G41400②4140
835M39 ④1.6747 708A37  
897M39 ④1.8523 708A42 ②4140
905M39 K24065③SACM645 708H37 H41350②4135H
945M38   708H42 H41400②4140H
Part 2
Requirements for steels for the manufacture of hot formed springs
503M40   709M40 ②4140H
503A37   722M24  
503A42   785M19  
503H37   816M40 G98400
503H42   817M40 G43400
520M60   823M30  
530M40 G51400 826M31  


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