Product Name: ASTM Steel Grating Trench Grating Systems Model NO.: MRG008 Size: Per Design Trademark: MR Transport Package: Pallet Specification: ASTM Origin: Qingdao, Shandong HS Code: 73089000 Product Description Trench Grating SystemsTrench Grating Systems allow the user to combine any of the gratings presented in ourTrench & Inlet Systemspage with any of the frames in theEmbed framessection of this website. Systems are available in Standard Duty for pedestrian loads or Heavy Duty for vehicular traffic. Unlike cast iron or molded trench products, this flexible system allows the user to specify the exact clear opening ("S" dimension) desired.Because we offer five distinct embed frame profiles, the user can select a frame to meet the exact edge condition desired. Bolting the grates to the frames is optional and must be specified.All gratings are provided with plain surface (the optional serrated surface is also available when specified) and open ends aretrench bandedto maximize drain capacity.Unless otherwise noted, all trench frames and grating are hot dip galvanized after fabrication in accordance with ASTM Specification A-123. Our most popular systems are listed in the table below.How To Specify Trench Systems Trench systems are specified by component model numbers. Simply follow the sample specification below.