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SERRATED SAFETY WASHERS ( RIB WASHERS ) :

Serrated Washers, Serrated Safety Washers, Rib Washers

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.
Serrated Washers, Serrated Safety Washers, Rib Washers
 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

IIS has ready stock of all the sizes of serrated safety washers, which can be supplied in variety of materials.

DIMENSIONS TABLE FOR SERRATED WASHER SERIES
Size (Nominal)
d1 H14
d2 H14
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
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
4
4.3
7
0.5
1
0.59
4
5/32"
5
5.3
9
0.6
1.1
0.73
5
3/16"
6
6.4
10
0.7

1.2
0.82
6
6.35
6.7
9.5
0.7
1.2
0.79
1/4"
7
7.4
12
0.7
1.3
0.89
7
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"
11.1
11.6
15.9
1
1.6
1.18
7/16"
12
13
18
1.1
1.7
1.31
12
12.7
13.7
19
1.1
1.8
1.33
1/2"
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
19
20
30
1.5
2.5
1.98
3/4"
20
21
30
1.5
2.5
1.94
20
22
23
33
1.5
2.7
2.08
22
7/8"
24
25.6
36
1.8
2.9
2.32
24
25.4
27
38
2
3.1
2.52
1"
27
28.6
39
2
3.1
2.52
27
30
31.6
45
2
3.6
2.78
30
11/8"
36
38
54
2.5
4.2
3.38
36
13/8"


Serrated Safety Washers, Rib Washers, Serrated Washers, Disc Springs, Washers, Ball Bearing Washers, Slotted Washers, Belleville Washers, Wave Spring Washers, Thane, India



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