Friends, what does I-beam 14a mean?

I-beam material 14# and 14a are the same

The standard of No. 14 I-beam is 140*80*5.5mm, and the weight of 1 meter is 16.89Kg.

I-beam, also known as steel beam (English name Universal Beam), is a long steel bar with an I-shaped cross-section. I-beams are divided into three types: ordinary I-beams, light I-beams, and H-beams. It is a section steel with a channel shape.

Whether I-shaped steel is ordinary or light, due to the relatively high and narrow cross-sectional dimensions, the moment of inertia of the two main axes of the cross-section is quite different, so it can only be directly used in other applications. Members subject to bending in the plane of the web or formed into lattice-type stress-bearing members. It is not suitable to use axial compression members or members that are perpendicular to the web plane and are curved, which greatly limits its application range.

H-shaped steel is an efficient and economical section profile (others include cold-formed thin-walled steel, profiled steel plates, etc.). Due to their reasonable cross-sectional shape, they can make the steel more efficient and improve its load-bearing capacity. Different from the ordinary I-shaped steel, the flange of the H-shaped steel is widened, and the inner and outer surfaces are usually parallel, which makes it easy to connect with other components with high-strength bolts. Its size series is reasonable and the models are complete, which is convenient for design and selection.