Cast Abrasive Structural Treads
Short Form Specifications Treads will be Barrycraft Alumatread or Feratread style as manufactured by Barry Pattern & Foundry Co., Birmingham, AL. Tread surface will have silicon carbide abrasive, a minimum of 2-1/4 ounces per square foot to a minimum depth of 1/32 of an inch. All castings will be of uniform quality, free from blowholes, shrinkage defects, swells, cracks or other defects. Treads will be true to pattern. Casting material will be free of fins, burrs and slag. Cast iron will have one coat of black paint. Aluminum will have a natural sand cast finish. Widths available: Width for structural treads are made to order. Minimum width is 4". The width should not exceed 12" to maintain structural strength. Standard surface: Cross-hatched abrasive. Available surface: Fluted - must be specified. Truss ribs may be furnished for additional support. Nuts and bolts for attachment by others. Maximum length: 5'6". |
(Click on diagram below to enlarge) |
Table B: Structural Tread Thickness | Style B-5: Bolted Shelf Angles And Riser Plates | ||||
Span | To 3'0" | To 4'0" | To 5'6" | ||
Feratread Abrasive Cast Iron | 7/16" | 1/2" | 5/8" | ||
Alumatread Abrasive Cast Aluminum |