How do I know what size my keyway is?
The keyway dimensions are also different from the English system. Metric keyways are dimensioned by width and depth as measured from the radius of the shaft to the center of the keyway. See dimensions W and h in Figure 1. Unless otherwise specified, the shaft keyway is assumed to be standard.
What is standard keyway size?
Standard Keyway & Setscrew Sizes
| Bore | Keyway | Setscrew |
|---|---|---|
| 5/8 to 7/8 | 3/16 x 3/32 | 1/4 – 20 |
| 15/16 to 1-1/4 | 1/4 x 1/8 | 5/16 – 18 |
| 1-5/16 to 1-3/8 | 5/16 x 5/32 | 3/8 – 16 |
| 1-7/16 to 1-3/4 | 3/8 x 3/16 | 3/8 – 16 |
What key is required for hub keyway?
a) Flat saddle key A flat saddle key is a taper key which fits in a keyway in the hub and is flat on the shaft.
What is a P9 tolerance?
The second is a P9 tolerance. This is an undersized clearance. The advantage of the Js9 tolerance is that the key can be inserted and the gear manipulated without much difficulty. Whereas the P9 tolerance is a press fit tolerance.
How do you pick a shaft key?
Key dimensions: Parallel keys are most commonly used. The key and key seat cross section are ISO standardized. The key length should be less than about 1.5 times the shaft diameter to ensure a good load distribution over the entire key length when the shaft becomes twisted when loaded in torsion.
What is the standard keyway for a 1 shaft?
Imperial – Rectangular B.S. 46 : PART 1 : 1958
| Nominal Shaft Diam | Key Size | |
|---|---|---|
| Over | To (incl.) | |
| 1 | 1 1/4 | 5/16 x 1/4 |
| 1 1/4 | 1 1/2 | 3/8 x 1/4 |
| 1 1/2 | 1 3/4 | 7/16 x 5/16 |
What is a shaft keyway?
Shaft keyway and keys are used to transmit torque from shafts to mechanical transmission elements such as gears, pulleys, etc. using a keyed joint. They can be made using either a standard stock material such as key stock or custom machined to suit the application.
Which type of the key used on the shaft and hub?
Sunk keys are the Types of keys which is installed on both the keyways of the shaft and hub. The upper half is placed on the hub keyway and the down half is placed on the shaft keyway. The sunk key also prevents relative motion between the shaft and hub. Shear resistance plays a major role in power transmission.
What is a H8 tolerance?
H8 (hole) tolerance range = +0.000 mm to +0.039. f7 (shaft) tolerance range = −0.050 mm to −0.025 mm. Potential clearance will be between +0.025 mm and +0.089 mm.
How do you calculate hubhub keyway depth?
Hub keyway depth is one-half the nominal height of the key and measured from the side corner. The dimension from the top of the keyway to the opposite bore side, “T-dim”, is calculated from (refer to ANSI/AGMA 9002-B04) the following: = bore + (h kw – Ch) Note: Class 1 clearance fits assumed.
How are bore and keyway dimensions calculated?
Bore and Keyway dimensions comply with ANSI/AGMA 9002-B04 Standard. Hub keyway depth is one-half the nominal height of the key and measured from the side corner. The dimension from the top of the keyway to the opposite bore side, “T-dim”, is calculated from (refer to ANSI/AGMA 9002-B04) the following: = bore + (h kw – Ch)
What are the industry standards for key sizes and keyways?
standard key and keyways must be held to recommended tolerances. Industry standards for key sizes in various bores exist for both English and Metric systems. A common standard available from the Mechanical Power Transmission Association is MPTA-B1-2003. Another useful industry standard is ANSI Standard B17.1 for Keys and Keyseats. Shallow Keys
What is the hub or bushing Keyseat called?
The hub or bushing keyseat can be referred to as a keyway. Keyway: The hub or bushing keyseat. In order to lock a hub or bushing and shaft together, and prevent the shaft from rotating in the bore, a key is commonly inserted into a keyway that is machined in both the bore and shaft.