# DEPTH CONTROL VALUES FOR SHAFT KEYSEATS AND HUB KEYWAYS

Tabulated depth control values for shaft keyseats and hub keyways are given in ANSI B17.1-1967 standard and this page has been prepared accordingly.

The distance from the bottom of the shaft keyseat to the opposite side of the shaft is specified by dimension S. The distance from the bottom of the hub keyway to the opposite side of the hub bore is specified by dimension T. For taper keyseats, T is measured at the deeper end. See the following figure for the dimensions.

##### Calculator:

 INPUT PARAMETERS Key Type Parallel KeyTaper Key Key Cross Section Square Rectangular Nominal Shaft Diameter 1/2 9/16 5/8 11/16 3/4 13/16 7/8 15/16 1 1-1/16 1-1/8 1-3/16 1-1/4 1-5/16 1-3/8 1-7/16 1-1/2 1-9/16 1-5/8 1-11/16 1-3/4 1-13/16 1-7/8 1-15/16 2 2-1/16 2-1/8 2-3/16 2-1/4 2-5/16 2-3/8 2-7/16 2-1/2 2-9/16 2-5/8 2-11/16 2-3/4 2-13/16 2-7/8 2-15/16 3 3-1/16 3-1/8 3-3/16 3-1/4 3-5/16 3-3/8 3-7/16 3-1/2 3-9/16 3-5/8 3-11/16 3-3/4 3-13/16 3-7/8 3-15/16 4 4-3/16 4-1/4 4-3/8 4-7/16 4-1/2 4-3/4 4-7/8 4-15/16 5 5-3/16 5-1/4 5-7/16 5-1/2 5-3/4 5-15/16 6 6-1/4 6-1/2 6-3/4 7 7-1/4 7-1/2 7-3/4 8 9 10 11 12 13 14 15

 RESULTS Parameter Symbol Value Unit Key Type --- --- --- Key Cross Section --- --- Key Size --- --- inch Nominal Shaft Diameter D --- Dimension S S --- Dimension T T ---

##### Definitions:

Keyseat: An axially located rectangular groove in a shaft or hub. Hub keyseat has been sometimes referred to as a keyway

Sunk Key: A standard form of key with rectangular or square cross-section in which the key fits into the keyseats on the shaft and the hub.

##### Reference:
• Oberg, E. , Jones ,F.D. , Horton H.L. , Ryffel H.H., (2016) . Machinery's Handbook . 30th edition.  Industrial Press Inc.
• Oberg, E. , Jones ,F.D. , Horton H.L. , Ryffel H.H., (2012) . Machinery's Handbook . 29th edition.  Industrial Press Inc.
• ANSI B17.1-1967, Keys and Keyseats