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 Table6


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 4
316S11 S31603

BS 1449
Steel plate, sheet and strip
Carbon and carbon manganese plate, sheet and strip

DCB3 C85700
316S31 S31600 G1 C90500
317S12 S31703 HTB(1) C96500
317S16 S31700 HTB3 C86200
321S31 S32100 LB1 C93800
331S42   LB2 C93700
347S31 S34700 LG1 C84400
349S52   LG2 C83600
349S54 S63008④1.4871 LG4 C92200
381S34   SCB3 C85400
401S45 S65007④1.4718 SCB6  
410S21 S41000 BS 1449
Steel plate, sheet and strip
Carbon and carbon manganese plate, sheet and strip
1 ④1.0335,1.0338,1.0392
416S21 S41600 2 ④1.0335,1.0333,1.0338
420S29 S42000 3 ④1.0347,1.0333,1.0335
430S17 S43000 4 ④1.0330,1.0332,1.0391
431S29 S43100 10 ④1.0301
443S65 S65006④1.4747 12  
Part 5
Carbon and alloy spring steels for the manfacture of hot formed springs
250A53 H92550④1.0904 14 ④1.0332
250A58 G92600④1.0909 15 ④1.0035
250A61 G92600④1.0906 17 ④1.0401
527A60 G50550④1.7176 20  
735A50 G61500④1.8159 22 ④1.0402
Part 6
SI metric values (for use with BS 970 Parts 1 to 5)
BS 1004
Spec. for zinc alloys for die casting and zinc alloy die castings
A Z33520 50  
B   60 K02502①A569
    70 K02502①A570-36
BS 1400
Spec. for copper alloy ingits and copper alloy and high condu-
AB1 ①B148-C95200 80  
AB2 ①B148-C95800 95  
CMA2 ①B148-C95700 34/20  


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