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Fingertip Reinforcement standards (historic)
Description

The specified yield stresses specified in the Standards for reinforcement have varied over the years. Some values are given below.

Plain round mild steel bars
BS 785: 1938 & BS 785: Part 1, 1967
36,000 psi for bars up to 1 inches

BS 4449: 1969, 1978 & 1988
250 N/mm2

Cold worked deformed bars
BS 1144: 1943
70,000 psi for bars less than 3/8 inch
60,000 psi for bars over 3/8 inch
50,000 psi for twin twisted bars

BS 1144: 1967
66,000 psi for bars up to 5/8 inch
60,000 psi for bars over 5/8 inch
72,000 psi for 72 Grade ribbed bars with rolling mark

BS 4461: 1969
460 N/mm2 for bars up to 16mm
425 N/mm2 for bars over 16mm

Hot rolled deformed bars
BS 785: Part 1, 1967
60,000 psi for medium tensile bars
70,000 psi for high tensile bars

BS 4449: 1969
410 N/mm2 for all sizes

BS 4449: 1978
460 N/mm2 for bars up to 16mm
425 N/mm2 for bars over 16mm


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Historic reinforcing bars and steel fabric
 
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