A.I.S.C. HOT-ROLLED STRUCTURAL STEEL SHAPE DESIGNATIONS
New Designation Type of Shape Old designation
W 24 x 76 W shape 24 WF 76
W 14 x 26 W shape 14 B 26
S 24 x 100 S shape 24 I 100
M 8 x 18.5 M shape 8 M 18.5
M 10 x 9 M shape 10 JR 9.0
M 8 x 34.3 M shape 8 x 8 M 34.3
C 12 x 20.7 American Std. Channel 12 C 20.7
MC 12 x 45 Miscellaneous Channel 12 x 4 C 45.0
MC 12 x 10.6 Miscellaneous Channel 12 JR C 10.6
HP 14 x 73 HP shape 14 BP 73
L6 x 6 x 3/4 Equal Leg Angle L 6 x 6 x 3/4
L6 x 4 x 5/8 Unequal Leg Angle L 6 x 4 x 5/8
WT 12 x 38 Structural Tee ST 12 WF 38
WT 7 x 13 Cut from W shape ST 7 B 13
ST 12 x 50 Cut from S shape ST 12 I  50
MT 4 x 9.25 Cut from M shape ST 4 M 9.25
MT 5 x 4.5 Cut from M shape ST 5 JR 4.5
MT 4 x 17.15 Cut from M shape ST 4 M 17.15
PL ½ x 18 Plate PL 18 X ½
Bar 1 Square Bar Bar 1
Bar 1-1/4 Ο Round Bar Bar 1-1/4 Ο
Bar 2-1/2 x 1/2 Flat Bar Bar 2-1/2 x 1/2
Pipe 4 Std. Pipe Pipe 4 Std.
Pipe 4 x . Strong Pipe Pipe 4 x-Strong
Pipe 4 xx Strong Pipe Pipe 4 xx-Strong
TS 4 x 4 x .375 Structural Tubing: Square Tube 4 x 4 x .375
TS 5 x 3 x .375 Rectangular Tube 5 x 3 x .375
TS 3 OD x .250 Circular Tube 3 OD x .250