Okla. Stat. tit. 45 § 423
The hoisting equipment shall be of such kind and in such condition as to as nearly assure certainty of operation and ease of control at all times, as is practicable. If electric power be used for hoisting, the hoist shall be equipped with an auxiliary safety brake. All hoisting derricks where swinging dump is used, constructed after the date of the passage and approval of this law, shall be so constructed that at no time during the hoisting operations shall the fastening of the cable to the hook approach nearer than thirty-six (36) inches to the sheive. All hoisting sheives installed after the date of the passage and approval of this law, shall be equipped with a shaft the diameter of which shall be to the conveyance load hoisted not less than one (1) inch to each six hundred (600) pounds per conveyance load. Nonspin wire rope shall be used for hoisting men and material, with a safety factor of six required on new rope based on manufacturer's tables and maximum dead load. Said hoisting rope to be discarded for hoisting purposes when there are six broken wires in one rope lay, or when the wires on the crown are worn sixty-five percent (65%) of the original diameter. All hoisting hooks shall be of some safety type, and if standard snap hook is used it shall be made of not less than one and one-half (1 1/2) inch High-grade iron, and the hook shall be attached to the hoisting cable with thimble and three or more standard clamps, such clamps to be at least eight (8) inches apart.
Okla. Stat. tit. 45, § 423