ISO 3912:1977 pdf download.Woodruff keys and keyways
1 SCOPE
This International Standard specifies the dimensional characteristics of Woodruff keys and of the alternative Whitney key and of the corresponding keyways in shaft and hub, It also gives the relationship to be observed between the diameter of the shaft and the section of the key for both torque transmission and positional applications.
2 FIELD OF APPLICATION
This International Standard is intended for general appli-cation to cylindrical shafts and cylindrical shaft ends. 1)
3 DIMENSIONS AND TOLERANCES OF KEYS
See the figures and table 1 on page 2.
4 MATERIAL
Steel having a tensile strength of not less than 590 N/mm2 in the finished condition, unless otherwise agreed between the interested parties.
NOTE - The mechanical properties of the steel will be specified completely at a later date.
5 SHAPE,DIMENSIONS AND TOLERANCES OF KEYWAYS
See the figure and table 2 on page 3.
6 RELATIONSHIP OF SHAFT DIAMETER TO KEY SIZE
Two series of relationships between shaft diameter and key size are given in table 3, page 4 : series 1 for torque appli-cations and series 2 for positional applications (for example where, as in the case of an interference fit, the torque is not transmitted through the key but through the shaft/hub interface).
7 DESIGNATION
A woodruff key shall be designated by its width and its height and by reference to this International Standard.
Examples
- For a key.of normal form and with a section b x h, = 5 x 6,5 mm :
Key IS03912- 5 x 6,5
- For a key of Whitney form and with a section b x h2= 5 x 5,2 mm :
Key ISO 3912- 5x5,2 ISO 3912 pdf download.