DIN 3970-1:1974-11

1 Scope
2 Symbols and denominations
3 Application and accuracy
4 Dimensions
      4.1 Gear blank
      4.2 Tooth systems
      4.3 Number of teeth z
      4.4 Tooth thickness s
      4.5 Addendum ha, active profile and tip circle
             diameter da
      4.6 Tooth flank direction
      4.7 Bore
      4.8 Wobble of contact faces and concentricity of
             receiving arbor
5 Hardness
6 Marking
7 Order details
8 Mounting master gears for acceptance testing
9 Packing, storing and handling
10 Master gears which do not comply with this Standard
      in all respects

Applies to straight-tooth and helical master gears for checking spur gears with normal module mn = 0.5 to 20 mm, helix angle beta up to 45degree and basic rack according to DIN 867.