Note: Grade 7 chain is commonly known as "transport grade." Grade 4 chain is commonly known as "high test grade."
TABLE 1: CHAIN GRADE MARKINGS USED BY U.S. CHAIN MANUFACTURERS
Company Name | Proof Coil Grade 3 (not acceptable) | High Test Grade 4 (Minimum acceptable diameter is 3/8 inch) | Transport Grade 7 (Minimum acceptable diameter is 5/16 inch | Alloy Grade 8 (Minimum acceptable diameter is 5/16 inch) |
Acco | "G3" | "G4" | "G7" | "A8A" |
Boltmaster-Taylor | "PC" or "BPC" | "HT" | (not manufactured) | (not manufactured) |
Campbell | "C3," "P" or "MP" | "C4" or "MH" | "C7" or "MT" | "C8" or "CA8" |
Columbus McKinnon | "G30" | "G43" | "G70" | "HA800" |
Crosby | "CG/PC/3" | "CG/C/4" | "CG/C/7" | "CB/A/8" |
Hodell | Unmarked | "G4" | "G7" | (not manufactured) |
Laclede | "L3" | "L4" | "L7" | "G8" |
Peerless | "PC" | "PH" | "P7" | "P8" |
Teledyne McKay | Unmarked | "MKH" | "MK7" | "MK8" |
Turner & Seymour | Unmarked | "TS4" or "4" | "TS7" or "7" | (not manufactured) |
Western | "PC" | "HT" | "S7" or "70" | (not manufactured) |
Note: Chain manufactured by Acco, Boltmaster-Taylor, Hodell, and Teledyne McKay is marked with a grade stamp on each link. The other chain manufacturers above mark their chain with a grade stamp, as indicated, every 10 to 20 links or 2 to 3 linear feet. This table is compiled from information published by the National Association of Chain Manufacturers. The department will update and revise this table periodically. New or additional marking information may be submitted by chain manufacturers to the Wisconsin Department of Transportation, Division of State Patrol, Motor Carrier and Inspection Services Section, P.O. Box 7912, Madison, Wisconsin 53707.
Wis. Admin. Code Department of Transportation § Trans 307.05