2 material grades - A36 and 65000psi minimum yield
Length and hole spacing - to customer specifications
Width - nominal 5-1/2 inches
Thickness
T-2 - minimum 0.100 inch
T-3 - minimum 0.125 inch
T-4 - minimum 0.145 inch
T-5 - minimum 0.165 inch
Design features
a) holes punched on the sides for hanging cables and ventilation materials b) channel ends have the corners rounded - such reducing sharp corners and prevent cuts to the miners hands and backs in low coal
