1.1 This specification covers normalized and tempered, and quenched and tempered carbon and alloy steel forged or rolled rings for reduction gears.

1.2 Several grades and classes of steel are covered as follows:

1.2.1 Grade 1 Classes A and B, Grade 2 Classes C and D are carbon steel.

1.2.2 Grade 3 Classes E and F, Grade 4 Classes G, H, I, J, K and L, Grade 5 Classes M and P, and Grade 6 Class T are alloy steel.

1.2.3 All grades and classes are considered weldable under proper conditions. Welding techniques are of fundamental importance and it is presupposed that welding procedure and inspection will be in accordance with proper methods for the class of material used.

1.3 The values stated in inch-pound units are to be regarded as the standard. The values given in parentheses are for information only.