20 EA BLADE, SNOW PLOW, 3/4 IN. X 6 IN. X 48 IN., STANDARD HIGHWAY PUNCH 6 HOLES 2 IN. FROM TOP, CARBIDE INSERT, THE BLADE SHALL BE FLAT HOT-ROLLED FINISHED STEEL TO MEET OR EXCEED SPECIFICATIONS FOR A36 OR 1020 TYPE STEELS. PUNCHING SHALL BE 11/16-IN.(0.688 IN.) SQUARE HOLES WITH COUNTERSINK OF 80 TO 82 DEGREES, .120 IN. MINIMUM DEPTH TO .180 IN. MAXIMUM DEPTH TO RECEIVE 5/8-IN. DIAMETER PLOW BOLTS. THE GROOVE FOR THE CARBIDE INSERTS SHALL BE MILLED IN THE CENTER OF THE BLADE EDGE. THE CARBIDE INSERTS SHALL BE A HIGH SHOCK WC GRADE OF TUNGSTEN CARBIDE WITH 11 TO 12-1/2% COBALT CONTENT, 14.1 MINIMUM TO 14.6 MAXIMUM DENSITY, 87.5 MINIMUM TO 89.0 MAXIMUM HARDNESS. THE INSERTS SHALL BE A TRAPEZOID DESIGN OF THE FOLLOWING DIMENSIONS: HEIGHT .635 IN. +/-.005, WIDTH .365 IN. +/-.010, LENGTH 1 IN. NOMINAL. THE INSERTS SHALL BE POSITIONED IN THE MILLED GROOVE AT APPROXIMATELY .010 BETWEEN THE INSERTS THE ENTIRE LENGTH OF EACH CUTTING EDGE. THE INSERTS SHALL BE BRAZED ON ALL SIDES CONSISTENT WITH SOUND BRAZING PRACTICE WITHOUT VOIDS OR THE USE OF SHIMS. EACH BLADE SECTION SHALL CONTAIN ONE INSERT, ONE INCH NOMINAL LENGTH FOR EACH INCH OF BLADE SECTION LENGTH, DUE TO THE THICKNESS OF THE BRAZE JOINTS BETWEEN THE INSERTS, IT MAY BE NECESSARY FOR SEVERAL INSERTS TO BE SLIGHTLY SHORTER OR LONGER THAN THE NOMINAL 1 IN. LENGTH TO INSURE THAT THE CARBIDE INSERT RUNS THE ENTIRE LENGTH OF THE BLADE WITHOUT PROTRUDING FROM THE END OF THE STEEL BLADE. THE BLADES SHALL BE PAINTED ON BOTH SIDES AND ALL EDGES WITH YELLOW PAINT (REF: PRUETT-SCHAFFER CHEMICAL CO. PRODUCT CODE 20-14), 2 MILS MINIMUM THICKNESS AS PER ATTACHED DRAWING DATED MARCH 2009. 31 EA BLADE SAVER, CENTER, ISOLATED CARBIDE 1 IN. X 6 IN. X 21 IN., STANDARD HIGHWAY PUNCHING 4 HOLES 1.72 IN. FROM TOP, CARBIDE CYLINDRICAL DESIGN INSERTS, BLADE SHALL BE FLAT HOT-ROLLED FINISHED STEEL TO MEET OR EXCEED SPECIFICATIONS FOR A36 OR 1020 TYPE STEELS. PUNCHING SHALL BE 11/16-IN. SQUARE HOLES WITH COUNTERSINK OF 80 TO 82 DEGREES .120 MINIMUM DEPTH TO .180 INCH MAXIMUM DEPTH ON BOTH SIDES OF BLADE TO RECEIVE 5/8-IN. DIAMETER PLOW BOLTS. THE CARBIDE INSERTS SHALL BE A HIGH SHOCK WC GRADE OF TUNGSTEN CARBIDE WITH 10-1/2 TO 12-1/2 % COBALT CONTENT, 13.9 MINIMUM TO 14.6 MAXIMUM DENSITY, 86.8 MINIMUM TO 89.2 MAXIMUM HARDNESS. THE INSERTS SHALL BE CYLINDRICAL DESIGN WITH A DOME-SHAPED END OF THE FOLLOWING DIMENSIONS: HEIGHT: .753 IN. +/-.007, DIAMETER: .523 IN. +/-.004, BOTTOM ANGLE: 25 DEGREES WITH A NOSE RADIUS OF 1/16 IN. MINIMUM. THE INSERTS SHALL BE POSITIONED IN HOLES DRILLED IN THE CENTER OF THE THICKNESS OF THE BLADE AND SHALL BE SPACED .75 IN. CENTER TO CENTER ALONG THE ENTIRE LENGTH OF THE CUTTING EDGE SECTION. THE INSERTS SHALL BE BRAZED ON ALL SIDES CONSISTENT WITH SOUND BRAZING PRACTICE WITH NO EVIDENCE OF VOIDS IN THE BRAZE JOINT. THE BLADES SHALL BE PAINTED ON BOTH SIDES AND ALL EDGES WITH YELLOW PAINT (REF: PRUETTSCHAFFER CHEMICAL CO. PRODUCT CODE 20-14), 2 MILS MINIMUM THICKNESS. AS PER ATTACHED DRAWING DATED MARCH 2009.
