|
   
SEMS (Screw and Washer Assembly) |
|
 |
WASHER leakage
prevention |
+ |
productivity
improvement |
WASHER error
prevention |
Prime cost
reduction |
Easy work
and working time reduction |
quality improvement
|
|
 |
? washer size (JIS B 1256)
Unit: mm
classification |
M2 |
M2.6 |
M3 |
M3.5 |
M4 |
M4.5 |
M5 |
M6 |
M8 |
D(diameter)
|
5.5 |
0
-0.3 |
6.5
(5) |
0
-0.35 |
7
(6) |
0
-0.35 |
9
(7) |
0
-0.35 |
9
(8) |
0
-0.35 |
10
(9) |
0
-0.35 |
10 |
0
-0.35 |
12.5
(11.5) |
0
-0.4 |
17
(15.5) |
0
-0.4 |
T(thickness) |
0.3 |
±0.04 |
0.5 |
±0.05 |
0.5 |
±0.05 |
0.5 |
±0.05 |
0.8 |
±0.1 |
0.8 |
±0.1 |
1 |
±0.1 |
1.6 |
±0.15 |
1.6 |
±0.15 |
flatness
tolerance |
0.05 |
0.05 |
0.05 |
0.05 |
0.1 |
0.1 |
0.1 |
0.2 |
0.2 |
? numerical value inside ( ) is the one of small
size |
? imperfect screw size (U)
JIS B 1188
Unit : mm
classification |
M
2 |
M
2.6 |
M
3 |
M
3.5 |
M
4 |
M5 |
M
6 |
M
8 |
(wave
form)
spring washer |
1.8 |
2.1 |
2.4 |
2.8 |
3.5 |
4.3 |
5.1 |
6.7 |
plain
washer |
1.1 |
1.4 |
1.5 |
1.7 |
2.3 |
2.7 |
3.7 |
4.2 |
spring(wave
form) washer
+plain washer |
2.1 |
2.7 |
3.0 |
3.4 |
4.4 |
5.4 |
6.9 |
8.4 |
edge
washer |
- |
- |
1.9 |
2.1 |
2.3 |
2.8 |
3.2 |
4.2 |
edge
washer
+plain washer |
- |
- |
2.5 |
2.7 |
3.2 |
3.9 |
5.0 |
5.9 |
dish
washer |
- |
- |
1.7 |
- |
2.3 |
2.7 |
3.3 |
4.3 |
dish
edge washer |
- |
- |
3.4 |
4.0 |
4.6 |
5.4 |
6.6 |
8.3 |
|
|
 |
|
|
|
