A307 Grade a Zinc Plated Steel 5/16 In. X 1-1/2 In. External Hex Lag Screws (50-. Lag screw bolts are used in place of standard wood screws whenever the mounting surface must bear a heavy load. Note that lag screws do not accept nuts as they are technically thick...
Wrench Size3/8″TypeSquare Head BoltSystem of MeasurementImperial (Inch)Dia/Thread Size5/16-18SpecificationASTM A307ThreadCoarseFinishPlainMaterialSteelGradeALength5/8″
