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SERRATED
SAFETY WASHERS ( RIB WASHERS )
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Serrated Washers
are Disc Springs with Trapezoidal Cross Section on both
sides for gripping. lIS serrated safety washers are ready
to fit washers to sustain preload and avoid loosening.
As the bolt is tightened the serrations crunch into the
mating faces and prevents the screw from loosening up
due to vibration. Also, the disc shape holds the necessary
tension. They are available in various sizes to fit bolts
or screws. The diameters for Serrated Washers are matched
to screw dimensions. The outer diameter of washer is matched
to the head diameter of screw head. This allows using
screw and bolt including recessed heads, except countersunk
screw.
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The advantages of Serrated
Safety Washers are :
| 1. |
Used for high vibration
resistance due to positive rib contact |
| 2. |
Excellent pretensioning |
| 3. |
Through proper radius
selection, no splitting/cracking occurs during tightening |
| 4. |
The concentric force
of the washer eliminates the chances of bending the
fastener |
| 5. |
Extensive application
and flexibility, minimizes stocks |
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IIS has ready stock of all the sizes of serrated safety
washers, which can be supplied in variety of materials.
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DIMENSIONS
TABLE FOR SERRATED WASHER SERIES
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Size (Nominal)
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d1 H14
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d2 H14
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s
|
h max.
|
h min.
|
for bolts |
| (mm) |
(mm) |
(mm) |
(mm) |
(mm) |
(mm) |
metric
(mm) |
imperial
(inch) |
| 1.6 |
1.7 |
3.2 |
0.35 |
0.6 |
0.38 |
1.6 |
|
| 2 |
2.2 |
4 |
0.35 |
0.6 |
0.39 |
2 |
|
| 2.5 |
2.7 |
4.8 |
0.45 |
0.9 |
0.49 |
2.5 |
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| 3 |
3.2 |
5.5 |
0.45 |
0.9 |
0.51 |
3 |
1/8" |
| 3.5 |
3.7 |
6 |
0.45 |
0.9 |
0.52 |
3.5 |
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| 4 |
4.3 |
7 |
0.5 |
1 |
0.59 |
4 |
5/32" |
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| 5 |
5.3 |
9 |
0.6 |
1.1 |
0.73 |
5 |
3/16" |
| 6 |
6.4 |
10 |
0.7 |
1.2
|
0.82 |
6 |
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| 6.35 |
6.7 |
9.5 |
0.7 |
1.2 |
0.79 |
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1/4" |
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| 7 |
7.4 |
12 |
0.7 |
1.3 |
0.89 |
7 |
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| 8 |
8.4 |
13 |
0.8 |
1.4 |
0.98 |
8 |
5/16" |
| 10 |
10.5 |
16 |
1 |
1.6 |
1.21 |
10 |
3/8" |
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| 11.1 |
11.6 |
15.9 |
1 |
1.6 |
1.18 |
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7/16" |
| 12 |
13 |
18 |
1.1 |
1.7 |
1.31 |
12 |
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| 12.7 |
13.7 |
19 |
1.1 |
1.8 |
1.33 |
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1/2" |
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| 14 |
15 |
22 |
1.2 |
2.0 |
1.52 |
14 |
9/16" |
| 16 |
17 |
24 |
1.3 |
2.1 |
1.63 |
16 |
5/8" |
| 18 |
19 |
27 |
1.5 |
2.3 |
1.85 |
18 |
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| 19 |
20 |
30 |
1.5 |
2.5 |
1.98 |
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3/4" |
| 20 |
21 |
30 |
1.5 |
2.5 |
1.94 |
20 |
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| 22 |
23 |
33 |
1.5 |
2.7 |
2.08 |
22 |
7/8" |
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| 24 |
25.6 |
36 |
1.8 |
2.9 |
2.32 |
24 |
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| 25.4 |
27 |
38 |
2 |
3.1 |
2.52 |
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1" |
| 27 |
28.6 |
39 |
2 |
3.1 |
2.52 |
27 |
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| 30 |
31.6 |
45 |
2 |
3.6 |
2.78 |
30 |
11/8" |
| 36 |
38 |
54 |
2.5 |
4.2 |
3.38 |
36 |
13/8" |
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