Specifications include, but are not limited to: BLADE: The blade shall be flat hot rolled finished steel minimum SAE 1020 or equal with a minimum thickness of and width of 5 and 6. The groove for the carbide inserts shall be milled in the center of the blade edge. Punching shall be 11/16 square holes with counter sink to receive 5/8 diameter plow bolts. Location and spacing of holes shall be AASHO standard punched except one additional bolt hole may be added at the ends of each section to give greater support. Center of holes shall be in line within 1/32 of established centerline. TUNGSTEN CARBIDE INSERTS:. The inserts shall be a high shock WC grade of tungsten carbide with 11 to 12-1/2 percent cobalt content. Density: Minimum density of 14.1 Hardness: Minimum hardness of 87.5 measured on Rockwell A scale Transverse Rupture Strength: Minimum rupture strength of 300,000 psi
