What does ANSI MBG 531 mean?

ANSI/NAAMM MBG 531-17 ANSI/NAAMM MBG 531-17 Bearing bar spacing is designated by a number which indicates sixteenths of an inch, or mm. For welded or pressure-locked grating this is the distance, in sixteenths of an inch, or mm, center-to- center of bars.

Where is NAAMM MBG 531 located?

NAAMM MBG 531 800 Roosevelt Road Bldg. C, Suite 312 Glen Ellyn, Illinois 60137 Phone: (630) 942-6591 www.naamm.org email: [email protected] ANSI/NAAMM MBG 531-17 ANSI/NAAMM MBG 531-17 The members of the Metal Bar Grating Division of the National Association of Architectural Metal Manufacturers have supported the preparation of this Manual.

What is the ASTM B 221 standard for aluminum gratings?

b) Aluminum gratings: Bearing bars shall be either alloy 6005A-T61, 6061-T6, 6105-T5, or alloy 6063-T6, conforming to ASTM B 221 (B 221M). Cross bars and bent connecting bars shall be of alloy 6061 or 6063 conforming to ASTM B 221 (B 221M), or alloy 3003 conforming to ASTM B 210 (B 210M).

What is the minimum clearance between cross bars on grating?

1/4” (6) nominal clearance between ends of cross bars on rectangular grating or rivet heads on riveted grating. Metal shall be used for all grating supports and provide a 1 in. (25 mm) minimum bearing surface for depths up to 21/4in. (57 mm), and 2 in. (51 mm) minimum bearing surface for depth 21/2in. (64 mm) and over, at each end of span.