Specifications include, but are not limited to: TUNGSTEN CARBIDE TIPPED SNOW PLOW BLADES 1.0 BLADE 1.1 Blades shall be flat hot-rolled finished steel SAE 1020 of domestic manufacture. 1.2 Punching shall be 11/16" square holes to receive 5/8" diameter carriage bolts. Location and spacing of the holes shall be as shown on the attached drawings. 1.3 The groove for the carbide inserts shall be milled in the center of the blade edge. 1.4 Center of holes shall be in line within 1/32" of established centerline. 2.0 TUNGSTEN CARBIDE INSERTS 2.1 The inserts shall be WC grade of tungsten carbide with 11% to 12% cobalt content. Density: 14.1 minimum to 14.6 maximum. Hardness: 87.5 minimum to 89.0 maximum Rockwell "A" Scale. Transverse Rupture Strength (P.S.I.): 350,000 minimum. Porosity: (ASTM B276-79) A 06 B 00 C 00