3/8"-7 x 4" Grade A Plain Finish Hex Head Lag Screw / FASTENER LENGTH: 4.000 INCHES NOMINAL HEAD STYLE: C1 HEXAGON HEAD HEIGHT: 0.226 INCHES MINIMUM AND 0.268 INCHES MAXIMUM WIDTH BETWEEN FLATS: 0.544 INCHES MINIMUM AND 0.562 INCHES MAXIMUM MINIMUM TENSILE STRENGTH: 55000 POUNDS PER SQUARE INCH HARDNESS RATING: 60.0 ROCKWELL B NOMINAL OVERALL NONMACHINE THREAD STYLE: A13 GIMLET POINT (TYPE A, AB OR BA) NONMACHINE NOMINAL THREAD DIAMETER: 0.375 INCHES MATERIAL: STEEL OVERALL