Technical Information considering gears, mechanical components, steels, heat treatment and machining is listed following:

Case Hardness Depth Definition

Correction of gear toothing

Degree of gear accuracy vs application

Specification	Degree of accuracy ISO	Degree of accuracy AGMA
Control gears	2 - 4	13-12
Measuring instruments	3 - 6	13-10
Turbine reducers	3 - 5	13-11
Aviation reducers	3 - 6	13-10
Machine tools	3 - 7	13-9
Aviation engines	5 - 6	11-10
High speed gearboxes	5 - 6	11-10
Passenger cars	6 - 7	10-9
Industrial gearboxes	7 - 8	9-8
Light ship engines	7	9
Rolling mills, locomotives	8 - 9	8-7
Heavy ship engines, tractors	8 - 9	8-7
Building and agricultural machines	8 - 10	8-6
Textile machines	7 - 9	9-7

 

Degree of accuracy ISO 1328	3	4	5	6	7	8	9	10	11
Degree of accuracy AGMA	13	12	11	10	9	8	7	6	5
Max. surface roughness Ra max [nm]	0.1-0.2	0.4	0.8	1.6	1.6	3.2	6.3	12.5	25
Max. peripheral speed [m/s] straight teeth	80	60	35	15	8	5	3	3	3
Max. peripheral speed [m/s] helical teeth	100	80	50	30	12	8	5	3	3

 

Material of worm/gear

Optimum number of teeth for bevel gears

Recommended use of spline types

Steel Grade Equivalent

Steel Properties

Surface Roughness for different manufacturing proceses