Specifications include, but are not limited to: Carbide Adapter Blades, 3’ and 4’ Blade 1. Blade shall be ASTM A36 Structural Grade hot rolled flat steel. Blade size is 3/4" x 7” x 3 ft. or 4 ft. long. 2. Blade to have (2) sets of holes. The top set is a 2” on center punch pattern with holes drilled, counter-sunk, and square punched to accommodate a 5/8" plow bolt. The bottom set of holes has a 3-3-12 punch pattern, and are drilled thru at 11/16" diameter. 3. Dimensional tolerance between hole spacing is +/- 1/16" (non-accumulative) from center to center across the full length of blade. 4. The milled channel for carbide insert retention shall be positioned in the center of the blade edge. 5. Each blade will have weld stops positioned to enhance the performance of the blade assemblies. 6. All blades shall have a durable and clearly visible wear line in order to easily determine when blades need to be changed. Carbide Inserts 1. Inserts shall be trapezoidal in design, with the following dimensions: a. Length: 1.0" nominal b. Width: 0.36" min. e. Height: 0.63" max. d. Top angle: 25° with nose radius of 0.06" 2. Inserts to contain 89% tungsten (average by weight) and shall be of a grade containing 11% cobalt (average by weight). 3. Specific gravity (density) shall be between 14.35 and 14.60 gm/cc. 4. Hardness shall be Ra scale between 87.5 and 88.8, and have a minimum traverse rupture strength of 351,000 psi. Brazing 1. Each blade shall contain approximately (1) 1” carbide insert for each 1” of blade length. 2. The carbide inserts shall be placed in-line within the milled channel. 3. The carbide inserts shall be brazed on all sides in contact with the blade using sound brazing practice, having no evidence of voids, and no use of shims or fillers. 4. Brazing material shall have a tensile strength of 70,000 psi. 4’ Flexible Blade Clamp Bar 1. Clamp bar to be made of abrasion resistant steel. 2. Dimensions: 1/2” thick x 3” High. 3. Tolerance between hole spacing is +/- 1/16”, non-accumulative, from center to center across full length of clamp bar. 4. Punched for a 5/8” Carriage bolt and matching the bushing pattern on the blade.
