Page 93 - DJJ 40173 compile notes - E-BOOK NEW EDIT WITH INDEX_Neat

Selection and installation of key and

key-seat

◦ The key application usually designed after the shaft diameter is specified.

Shaft diameter as a guide the size of the key which selected using a table
ANSI Standard B17.1-1967(R98)

◦ Key are most often made from low-carbon, cold drawn steel as table AISI

1020 CD which contain information about material condition, max tensile

strength, yield strength, ductility and hardness.

Key classification:

1. saddle key and sunk key

2. square key and flat key

3. Taper key and parallel key

4. Key with and without Gib-head

Selection of key

1. Power to be transmitted

2. Tightness of fit

3. Stability of connection

4. cost