Steel Alternating Tread Stair

What is an alternating tread stair and why would I use one? Click here to find out

The steel alternating tread stair:

  • Utilizes a three stringer design, with the alternating treads welded to the stringers.
  • Handrails bolt in place during the installation process.
  • Available in stainless steel, with a natural finish, and carbon steel with a variety of finishes.

Stair Design Details

Table 1: Steel Alternating Tread Stair Design Details
Material Carbon Steel Stainless Steel
Stair Finishes Safety Yellow Powder Coat
Gray Primer Powder Coat
Iron Gray Powder Coat
Hot Dip Galvanized
Choice of Color Powder Coat
Natural finish only
Angles 56°
68°
heights Custom height built to exact vertical height
Standard Rails:
 • 36" to 240" in 56 Degree Angle
 • 42" to 240" in 68 Degree Angle
Optional and Flush Rails:
 • 48" to 240"

Rail Options - All rails are close fitting with a 20” inside width and 23” outside width.   (What happened to the older “Narrow” handrail design?)

  • Standard Handrail - Extends 42” above the top landing of the stair and is used on most stair applications.
  • Optional Handrail – This shortened rail extends 5-3/4” above the top landing of the stair and is designed for use within a roof hatch or a hatch with a standard 12” curb.  This is the most commonly used option for stairs going through an access hatch.
  • Flush Handrail – Rail terminates flush with the top landing of the stair.  This rail is the least common and is used inside of access hatches with little to no curb. 


Contact your customer service rep if you need help determining which rail best fits your application.

 


Table 2: Handrail tech specs
Configurations Rail Height --From Top Landing Inside Handrail Dimensions Outside Handrail Dimensions View Drawings
Standard Handrail 42" 20" 23" 56º
68º
Optional Handrail *roof Hatches 5-3/4" Steel 20" 23" 56º
68º
Flush Handrail 0" - Terminates at top Landing 20" 23" 56º
68º