Major Metal Cast Aluminum Structural Stair Treads
Stair Treads are only available in Cast Aluminum.

TYPE 104
Nose 1"x1" (25.4mm x 25.4mm) Chief use: as structural treads with bent-plate risers or superimposed on existing steps.		 TYPE 106A
Double nose tread. reversible. Chief use: as structural tread supported by carrier angles on stringers. Open risers.

TYPE 107
Nose 3/4" X 3/4" (19.05 mm x 19.05 mm),
toeplate 1" (25.4 mm). End lugs provided
for bolting directly to stringer. Open risers. Click HERE for application photograph of End Lug.

Type 105-A
Nose 1" x 1-1/2" (25.4 mm) x 38.1 mm)
Chief use: as structural treads with bent-plate risers or superimposed on existing steps.
   

TYPE 106
Double nose tread, reversible. End lugs provided for bolting treads directly to stringers. Click HERE for application photograph of End Lug.

TYPE 117A
Double nose ladder tread, reversible.
Chief use: marine and industrial ladders.
Treads bolt directly to stringer.
 

Type 105
Nose 1" x 1-1/2" (25.4 mm x 38.1 mm ) toeplate 1" (25.4 mm) Chief use: as structural treads. Nosing and toeplate can be drilled for attaching flat plate risers, when specified.

TYPE 107A
Nose 3/4" X 3/4" (19.05 mm x 19.05 mm), toeplate 1" (25.4 mm). Structural tread fastened to carrier angles on stringers. Open risers.
   

TYPE 117
Double nose tread, reversible. Chief use: as structural tread fastened to carrier angles on stringers.

TYPE 105-B
Chief use: as structural treads with bent-plate risers or superimposed on existing steps.

Back to Major Metal Cast Treads Introduction
  • Castings are subject to usual foundry draft, tolerances and thickness +/- 1/8".
  • Nosing will show a parting line on nose surface.
  • Standard measurements are from top of nosing.
  • Custom lengths to +/- 1/16".
  • Standard hole size 1/4" with countersunk hole tops.
  • Beveled Treads: Contact The mat King regarding availability per application.
Maximum Length versus Depth - To be used as a guide when developing a specification or bid request. Platform recommended piece size. Consult The Mat King for details.
Type Number Metal Depth Thickness Structural Max Length Non-Structural Max Length Diagram
100 Cast Aluminum 1.5" to 6" 5/16" to 3/8" N/A 8'-6"

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Type 100

Architectural Specifications
    6" to 12" 5/16" to 5/8" N/A 6'
101 Cast Aluminum 1.5" to 6" 5/16" to 3/8" N/A 8'-6"
    6" to 12" 5/16" to 5/8" N/A 6'
101SP Cast Aluminum 1.5" to 6" 5/16" to 3/8" N/A 8'-6"
    6" to 12" 5/16" to 5/8" N/A 6'
102 Cast Aluminum 1.5" to 6" 5/16" to 3/8" N/A 8'-6"
    6" to 12" 5/16" to 5/8" N/A 6'
103 Cast Aluminum 1.5" to 6" 5/16" to 3/8" N/A 8'-6"
    6" to 12" 5/16" to 5/8" N/A 6'
104 Cast Aluminum 1.5" to 6" 5/16" to 3/8" N/A 8'-6"
    6" to 12" 5/16" to 5/8" N/A 6'
110 Cast Aluminum 1.5" to 6" 5/16" to 3/8" N/A 8'-6"
    6" to 12" 5/16" to 5/8" N/A 6'
116 Cast Aluminum 1.5" to 6" 5/16" to 3/8" N/A 8'-6"
    6" to 12" 5/16" to 5/8" N/A 6'
116A Cast Aluminum 1.5" to 6" 5/16" to 3/8" N/A 8'-6"
    6" to 12" 5/16" to 5/8" N/A 6'
120 Cast Aluminum 1.5" to 6" 5/16" to 3/8" N/A 8'-6"
    6" to 12" 5/16" to 5/8" N/A 6'
105  Cast Aluminum 6" to 12" 1/2" to 5/8" 5' 6'
105-A Cast Aluminum 1-1/8" Slanted 5/16" to 3/8" N/A 8'-6"

Type 105-A

Architectural Specifications
    6" to 12" 5/16" to 5/8" 5' 6'
105-B Cast Aluminum 1-1/8" Slanted 5/16" to 3/8" N/A 8'-6"
    6" to 12" 5/16" to 5/8" 5' 6'
             
106 Cast Aluminum 4" to 6" 1/2" to 5/8" N/A 8'-6"
      6" to 12" 1/2" to 5/8" 5' 6'
107 Cast Aluminum  10" to 12" 1/2" to 5/8" 5' 6'
107-A  Cast Aluminum or Cast Iron 10" to 12" 1/2" to 5/8" 5' 6'

117
  Cast Aluminum

4" to 6"

 1/2" to 5/8" N/A 8'-6"
   

6" to 12"

 1/2" to 5/8" 5' 6'

117-A
Cast Aluminum

4" to 6"

 1/2" to 5/8" N/A 8'-6"
   

6" to 12"

 1/2" to 5/8" 5' 6'

150
Cast Aluminum
 1.5" to 1.5"

3/8"

 N/A 6'
           

250
Cast Aluminum
 2.5" to 2.5"

1/2"

 N/A 6'
 

Back to Major Metal Cast Treads Intro

Connecting Riser to Nose and Toe Plate Example Drawing

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