Okla. Stat. tit. 45, § 45-423: Hoisting equipment

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.