Technical Information

Tensile Strenght Ranges

Tensile strength for the various specifications of hardened and tempered material in BS 970 are designated with the reference symbols P to Z.

Reference Symbol Tensile Strength N/mm2* Tensile Strength tons/sq. in.
P 550-700 35-45
Q 625-775 45-50
R 700-850 45-55
S 775-925 50-60
T 850-1000 55-65
U 925-1075 60-70
V 1000-1150 65-75
W 1075-1225 70-80
X 1150-1300 75-85
Y 1225-1375 80-90
Z 1550min 100min
*1 N/mm2 = 1MPa