Page 26 - ZSi-Foster Product Catalog

Materials & Manufacturing Details

General Information Fittings
Most channels are produced in 10 and 20-foot lengths with a length General
tolerance of plus or minus ⁄16.
1
Fittings are manufactured by cold forming steel in punch press
W600 and W700 are produced in 10 foot lengths only. dies and conform to those tolerances listed in section 5.3 of Metal
Framing Standards Publication No. MFMA-1.
Channels Material
General Steel used for fittings is Hot-Rolled Pickled and Oiled strip steel or
bar conforming to ASTM A 570 or ASTM A575.
Channels are manufactured by the cold roll forming process which
produces cross sections of uniform dimensions within tolerances Welding
established by the Metal Framing Manufacturer's Association, Fittings having two or more component parts may be arc or
Metal Framing Standards Publication No. MFMA-1. resistance welded in accordance with the appropriate American
Material Welding Society Standards.
Steel used in the manufacture of channels conforms to the
ASTM specifications in this catalog. Finishes
Design Electroplated Zinc or Electro-Galvanized
Design is based on AISI "Specification for the Design of This coating is standard for most ZSi-Foster products. Electro-
Cold-Formed Steel Structural Members." Maximum bending stress Galvanized products meet ASTM B633 SC1 or SC3, Type
used in design is 25,000 pounds per square inch (PSI). This is III. Electroplating deposits zinc on the surface of the steel by
based upon a virgin steel minimum yield stress of 33,000 psi cold electrolysis from a bath of zinc salts. The thickness of zinc applied
worked to an average yield stress of 42,000 psi. in this method is between 0.2 mils to 0.5 mils [5.1 µm to 12.7 µm].
Welding Mill-Galvanized (Pre-Galvanized)
Welds meet the performance requirements of section 4 of AISI ASTM A653 G-90 Pre-galvanized zinc is produced by continuously
"Specification for the design of Cold-Formed Steel Structural rolling steel coils or sheets through molten zinc at the mills.
Members." All multiple sections of two or more single channels are The coils are slit to size and fabricated by forming, shearing or
resistance spot-welded approximately 2" to 3" on center. punching to produce the finished product. During fabrication cut
edges are not generally zinc coated. However, the zinc near the
Channel Nuts uncoated metal becomes a sacrificial anode to protect the bare
areas.
General
Paint-Green Powder Coating
Channel nuts are formed or stamped from steel bar stock and
is case hardened after all forming and taping operations have A dark green low gloss powder coating is applied and thoroughly
been completed. The nuts are coated with zinc to ASTM-B633 baked after steel has been cleaned and phosphatized.
"Electrodeposited Coatings of Zinc on Iron and Steel." Hot Dip Galvanized After Fabrication
Channel nuts have uniform and American coarse screw threads. Channel and fittings which are hot dip galvanized after fabrication
Channel nuts are available both with and without springs. Springs conform to one of the following specifications. ASTM A 123,
are made from Galvanized spring steel wire. ASTM A153 or ASTM A386.
Material Silva-Guard
The bar steel used in manufacture of channel nuts conforms to Silva-Guard coating is a multi-step process that meets the 1000
ASTM A575 or ASTM A576. hour salt spray test per ASTM B117 and DIN 50021. Silva-Guard
coating is WEEE, ELV, and RoHS compliant. SG Finish is
Weights and Dimensions approved for outdoor as well as indoor applications. It is a chrome
All weights given for materials are approximate shipping weights. free duplex coating system that combines an inorganic zinc-rich
Weights will vary somewhat due to permissible tolerances and basecoat with an aluminum-rich organic topcoat.
slight variations in material thickness. Special Coatings
We reserve the right to change design specifications or to add or Other commercially available finishes can be supplied per
discontinue specific items without notice. specification when required to protect applications.

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