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The impression of screw tip should clearly appear on the shaft
cylinder surface. A correlation between non-tightening shaft
diameter and set screw is shown as below.
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Shaft Diameter and Set Screw Size
The fixation limit (shaft holding power) of shaft and hub or flange
is related to the friction factor between the tip of set screw and
shaft. The fixation limit based on the data of examination results
is described below.
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Shaft Diameter and Shaft Holding Power
Shaft holding power decreases as hardness of non-tightening
shaft increases. The relationship between hardness and shaft
holding power is described below.
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Hardness and Shaft Holding Power
Two set screws are sometimes used when a large shaft holding
power is required. However, using two set screws does not
necessarily mean that the shaft holding power becomes double.
This is because shaft holding power is different depending on the
open angle (alignment) between two set screws. The following
diagram indicates the relationship between set screw open angle
and shaft holding power.
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If the Size of Set Screw Cannot be Enlarged
Screw tip impression
Correlation between set screw and shaft diameter
60
50
40
30
20
10
3
4
5
6
8
10
12
shaft diameter [mm]
(Example)
set screw diameter [mm]
Max. shaft diameter
Min. shaft diameter
Good example Bad example
Set screw open angle and shaft holding power
0
30
60
2.0
1.8
1.6
1.4
1.2
1.0
90
120
150
180
Magnification of shaft holding
power per set scr
ew
In the case
of one.
Set screw open angle [ ° ]
Non-tightening shaft diameter and shaft holding power
(concave point)
* Shaft holding power of set screw is related to the size of non-tightening shaft diameter.
10,000
5,000
1,000
500
200
5
10
15
20
25
M5 T = 441N·cm
M4 T = 216N·cm
M3 T = 98N·cm
30
35
Shaft diameter [mm]
Shaft holding powe [N·cm]
Set screw and shaft hardness and shaft holding power
1.0
20
25
30
35
40
45
50
55
60
0.5
Decreasing rate of shaft holding power
Hardness of shaft [HRC]
Set screw HRC40
Set screw HRC50
How to Use Hexagon Socket Set Screws
Technical Data
Supplementary information
Содержание COUPLINGS
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