Specifications include, but are not limited to: 2. Regular Steel Snow Plow Blades: Blades shall be constructed in accordance with American Society for Testing and Materials (ASTM) A36 or ASTM A29 standards. 2.1. Blades shall be of typical SAE- AISI grade for this application: 1084, 1090, etc. 2.2. Blades shall be manufactured to a uniform range on the Rockwell “C” R(c) and Brinell scales. Hardness testing shall be in accordance with the current versions of ASTM E-18 and ASTM E-10 through E-14. Hardness Range Rockwell C Scale Min 24 Max 36 Brinell Scale 215 337 2.3. Length, Width, and Thickness of the blade will be specified on the solicitation. Tolerances shall be +1/16” to -3/32” width from spec and +/- 1/8” length from spec. 3 foot Blades shall be straight and flat within 1/8 inch. 4 foot blades shall be straight and flat within 3/16 inch. Longer blades shall be straight and flat within ¼ inch over 5 feet. 2.4. Blades shall have standard AASHTO square highwaypunching holes for 5/8” bolts. Holes shall becountersunk11/16 inchon the cutting side, to allow bolt head align flushwithsurfaceofblade. Holes shall bespaced 12 inches center to center ona straight line and located within .06 inch of true position using both ends as reference points. The .06 inchshall be ± non-accumulative. The first hole on the left shall bespaced 3 inches fromthe end withthe second hole 3 inches fromthe first hole. The right end of the blade shall be spaced the same as the left end. Height from top of blade will be two inches on center. 2.5. Blades shall be coated with a rust-preventative solution. 3. Tungsten Carbide Insert Blades: Blades shall be constructed in accordance with American Society for Testing and Materials (ASTM) A36 or ASTM A29 standards. 3.1. Blades shall be of typical SAE- AISI grade for this application: 1020, 1021, 1025, 1026, A36, etc. 3.2. Blades shall be manufactured to a uniform range on the Rockwell B (Rb) and Brinell scales. Hardness testing shall be in accordance with the current versions of ASTM E-18 and ASTM E-10 through E-14. Hardness Range Rockwell B Scale Min 66 Max 73 Brinell Scale 119 235 3.3. Length, Width, and Thickness of the blade will be specified on the solicitation. Tolerances shall be +1/16” to -3/32” width from spec and +/- 1/8” length from spec. Blades shall be straight and flat within ¼ inch over 5 feet. 3.4. Blades shall have standardAASHTOsquare highway punching holes for 5/8” bolts. Holes shall be countersunk 11/16 inch countersunk on the cutting side, to allow bolt headalignflushwithsurfaceofblade.Holesshallbespaced12inchescenterto center on a straight line andlocated within.06 inchof true position using both ends asreference points. The .06 inchshall be ± non-accumulative. The first hole on the left shall bespaced 3 inches from the end with the second hole 3 inches fromthe first hole. The rightend of the blade shall bespaced the same as the leftend. Height from top of blade will be two inches on center. 3.5. Carbide Inserts shall be constructed of a high shock WC. Inserts shall have the following characteristics: Cobalt Content 11% to 14% Density 14.1 – 14.6 Hardness 87.5 to 89.0 Rockwell A R(a) 170-185 Brinell
