A3

A0

A2

A4

1:2000

1:100

1:50

1:1500

297 mm x 420 mm

210 mm x 297 mm

250 mm x 330 mm

330 mm x 450 mm

tooth thickness

module

gear ratio

Both (2) and (3)

Contradictory additive dimensions which can affect the actual location and interchangeability should be avoided

All important dimensions with reference to the locating surface should be clearly marked

The dimensions should be shown at place where they can be measured directly

All of the above