Type A stair treads are offered in an aluminum locked by swaging construction and are made with a corrugated (grooved) nosing that is welded to the leading edge of the tread. The stair treads are fabricated from stock panels.
Product Information
There are two bearing bar shapes available for Type A stair treads. The most common is the Rectangular bar shape because it offers more strength than the ?I? bar shape. The ?I? bar shape is more suited to architectural design. Type A stair treads are available in a variety of bar heights: 1, 1-1/4, 1-1/2, or 1-3/4 inches.
Rectangular Locked by Swaging
I-Bar Locked by Swaging
End Plates
End plates are welded to the ends of the stair tread. The diagram below shows the end view of an end plate and its dimensions.
End View of End Plate
Explanation of Dimension ?A?, ?B?, and ?C?
The ?A? dimension in the illustration above varies according to the width of the stair tread. See the ?A? Dimension Table below for exact measurements.
RECTANGULAR BAR
I-BAR
Width of Tread
(Inches)
?A?
(Inches)
Width of Tread
(Inches)
?A?
(Inches)
2?1/2
5?1/16
2?1/2
6?3/16
2?1/2
6?1/4
2?1/2
7?3/8
4?1/2
7?7/16
4?1/2
8?9/16
4?1/2
8?5/8
4?1/2
9?3/4
9?13/16
10?15/16
11
12?1/8
12?3/16
The ?B? and ?C? dimensions in the illustration above vary according to the material that the end plate is made from. See the ?B? and ?C? Dimension Table below for exact measurements.
Both RECTANGULAR and I-BAR
Material
?B?
(Inches)
?C?
(Inches)
Aluminum
2?1/4
Last Updated almost 4 years
