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tipped pcbn inserts in 55 degree diamond shape D for hard turning ferrous metals of cast iron and hardened steel, the cbn insert cutting edges are made with polycrystalline cubic boron nitride, indexable inserts with cbn tips are precision cutting tools, which are used in cnc fine finish machining and turning roller, bearing, pumps, automobile brake disk, aircraft jet engine.for container a572 grade 50 house manufacturing tolerance Technical Product Manual - Nucor Skyline A 572 Grade 50 50 345 A 572 Grade 50 50 345 A 572 Grade 60 60 415 A 572 Grade 60 60 415 A 572 Grade 65 65 450 A 588 50 345 A 588 50 345 A 690 50 345 A 690 50 345 Highlighted fields represent the most commonly used and readily available steel grades. Delivery Conditions & Tolerances ASTM A 6 Mass ± 2.5% Length + 5 in. 0 in. Maximum Rolled