AGMA - American Gear Manufacturers Association

AGMA - American Gear Manufacturers Association

AGMA is a full service trade association representing 400 manufacturers and users of gears and gearing products, suppliers of equipment and services to the industry, individual consultants and academicians. AGMA has members in 30 countries and, in fact, is quickly becoming the Association for global manufacturers in the gear industry.
1500 King Street, Suite 201 Alexandria, VA 22314-2730
Tel: 703-684-0211; Fax: 703-684-0242; website: www.agma.org

AGMA Quality Class Numbers:
The AGMA gear quality numbers range from 3 through to 15 and identify the accuracy level of the tooth element tolerances that are permissible in the manufacture of each particular gear in terms of its specialised use. The permissible tolerances for the different quality numbers may be obtained from the AGMA standards, which show the type of gear and the permissible tolerances and inspection dimensions.

Fig. 1 shows a sample table of suggested quality numbers for spur, helical, herringbone, bevel and hypoid gears, racks and worm gearing.

Application		Quality Number
AEROSPACE
	Actuators	7 - 11
	Control Gearing	10 - 12
	Engine Accessories	10 - 13
	Engine Power	10 - 13
	Engine Starting	10 - 13
	Loading Hoist	7 - 11
	Propellor Feathering	10 - 13
	Small Engines	12 - 13

Once a suitable quality number has been decided, the relevant tolerances for the tooth elements can be selected from the AGMA quality standards. The chart below is a sample of the tooth thickness table.

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