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 Table20


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 3606
LWHT316S29 S31603 BS4360
55C K02002
LWHT321S22 S32100 55E K12202①A633-E
LWHT347S17 S34700 55F K02002
LWHT316S25 S31600 BS4449
Spec. for carbon steel bars for the reinforcement of concrete
Mild ①A615-40
W304S22   60 ①A615-60
Spec. for weldable structural steels
WR50A K11510    
WR50A1 K11510    
WR50B K11430    
WR50B1 K11430 BS4659
Spec. for tool and die steels
BA2 T30102
WR50C K12043 BD2 T30402
WR50C1 K11538 BD2A  
40A K02300④1.0040 BD3 T30403
40B K02300①A131A,B BH10 T20810
40C K01802④1.0116 BH10A  
40D K01802④1.0136 BH11 T20811
40DD   BH12 T20812
40E K02507①A131D,E BH13 T20813
40EE   BH19 T20789
43A K02606①A283-D BH21 T20812
43A K02507 BH21A  
43B K02404①A36 BH224/5  
43C K01802④1.0144 BL1  
43D K01802④1.0144 BM1  
43DD   BM2 T11302
43E K02404①A573-65 BM4 T11304
43EE   BM15  
50A K02401 BM35  
50B K12000④1.0050 BM42 T11342
50C K12037④1.0050 BO1  
50D K12000①A633-C BO2  
50DD K12202 BP20  
50E K02508 BP30  
50EE   BS1  
50F K02002 BT1 T12001
      BT4 T12004


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