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DIN 25201 (washer) Washer

DIN 25201 Washer is a paired self-locking washer set that uses matching wedge-shaped surfaces to provide loosening resistance. Carbon steel or stainless steel versions can cover different strength and corrosion-resistance needs, making the product suitable for high-vibration joints.

It is used in construction machinery, rail vehicles, wind power equipment, mining machinery, bridge accessories, and heavy steel structures. When a loosening tendency appears, the paired washer geometry creates a counteracting locking effect that helps maintain preload and reduce maintenance frequency.

Selection should consider bolt strength, surface hardness, load direction, and environmental corrosiveness to ensure the washer set matches the fastener assembly and provides stable mechanical locking performance.

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Dimensions unit: mm

Specification

3

3.5

3.5

4

4

5

5

6

6

1/4 ①

1/4

8

8

3/8 ①

sp enlarged size ②

sp enlarged size ②

sp enlarged size ②

sp enlarged size ②

sp enlarged size ① ②

sp enlarged size ②

Bolt specifications

Metric

 

M3

M3.5

M3.5

M4

M4

M5

M5

M6

M6

-

-

M8

M8

-

Inches

 

#5

#6

#6

#8

#8

#10

#10

-

-

1/4”

1/4”

5/16”

5/16”

3/8”

d

Max.

 

3.5

4

4

4.5

4.5

5.5

5.5

6.6

6.6

7.3

7.3

8.8

8.8

10.5

Min.

 

3.3

3.8

3.8

4.3

4.3

5.3

5.3

6.4

6.4

7.1

7.1

8.6

8.6

10.1

dc

Nominal

 

7

7.6

9

7.6

9

9

10.8

10.8

13.5

11.5

13.5

13.5

16.6

16.6

Max.

 

7.2

7.8

9.2

7.8

9.2

9.2

11

11

13.7

11.7

13.7

13.7

16.8

16.8

Min.

 

6.8

7.4

8.8

7.4

8.8

8.8

10.6

10.6

13.3

11.3

13.3

13.3

16.4

16.4

h

Carbon steel

Nominal

1.8

1.8

1.8

1.8

1.8

1.8

1.8

1.8

2.5

2.5

2.5

2.5

2.5

2.5

Max.

2.05

2.05

2.05

2.05

2.05

2.05

2.05

2.05

2.75

2.75

2.75

2.75

2.75

2.75

Min.

1.55

1.55

1.55

1.55

1.55

1.55

1.55

1.55

2.25

2.25

2.25

2.25

2.25

2.25

Weight per thousand pieces kg ③

Carbon steel (7.85)

≈

0.41

0.46

0.72

0.42

0.67

0.56

0.96

0.81

2.14

1.22

1.99

1.62

3.05

2.55

h

Stainless steel

Nominal

2.2

2.2

2.2

2.2

2.2

2.2

2.2

2.2

2

2.2

2.2

2

2

2

Max.

2.45

2.45

2.45

2.45

2.45

2.45

2.45

2.45

2.25

2.45

2.45

2.25

2.25

2.25

Min.

1.95

1.95

1.95

1.95

1.95

1.95

1.95

1.95

1.75

1.95

1.95

1.75

1.75

1.75

Weight per thousand pieces kg ③

Stainless steel(7.93)

≈

0.5

0.57

0.89

0.51

0.83

0.7

1.18

1

1.73

1.08

1.77

1.31

2.47

2.06

  

Specification

3/8

10

10

11

12

12

1/2 ①

1/2

14

14

16

16

18

18

sp enlarged size ① ②

sp enlarged size ②

sp enlarged size ②

sp enlarged size ① ②

sp enlarged size ②

sp enlarged size ②

sp enlarged size ②

Bolt specifications

Metric

 

-

M10

M10

M11

M12

M12

-

-

M14

M14

M16

M16

M18

M18

Inches

 

3/8”

-

-

7/16”

-

-

1/2”

1/2”

9/16”

9/16”

5/8”

5/8”

-

-

d

Max.

 

10.5

10.9

10.9

11.6

13.2

13.2

13.7

13.7

15.4

15.4

17.2

17.2

19.7

19.7

Min.

 

10.1

10.5

10.5

11.2

12.8

12.8

13.3

13.3

15

15

16.8

16.8

19.3

19.3

dc

Nominal

 

21

16.6

21

18.5

19.5

25.4

19.5

25.4

23

30.7

25.4

30.7

29

34.5

Max.

 

21.2

16.8

21.2

18.7

19.7

25.6

19.7

25.6

23.2

30.9

25.6

30.9

29.2

34.7

Min.

 

20.8

16.4

20.8

18.3

19.3

25.2

19.3

25.2

22.8

30.5

25.2

30.5

28.8

34.3

h

Carbon steel

Nominal

2.5

2.5

2.5

2.5

2.5

3.4

2.5

3.4

3.4

3.4

3.4

3.4

3.4

3.4

Max.

2.75

2.75

2.75

2.75

2.75

3.65

2.75

3.65

3.65

3.65

3.65

3.65

3.65

3.65

Min.

2.25

2.25

2.25

2.25

2.25

3.15

2.25

3.15

3.15

3.15

3.15

3.15

3.15

3.15

Weight per thousand pieces kg ③

Carbon steel (7.85)

≈

5.1

2.42

4.97

3.2

3.18

9.87

2.97

9.59

6.12

14.79

7.32

13.56

9.49

16.82

h

Stainless steel

Nominal

2

2

2

2.2

2

3

2

3.2

3

3.2

3

3.2

3.2

3.2

Max.

2.25

2.25

2.25

2.45

2.25

3.25

2.25

3.45

3.25

3.45

3.25

3.45

3.45

3.45

Min.

1.75

1.75

1.75

1.95

1.75

2.75

1.75

2.95

2.75

2.95

2.75

2.95

2.95

2.95

Weight per thousand pieces kg ③

Stainless steel(7.93)

≈

4.12

1.95

4.01

2.85

2.57

8.8

2.4

9.12

5.45

14.06

6.53

12.89

9.03

15.99

   

Specification

3/4 ①

3/4

20

20

22

22

24

24

1 ①

1

27

27

30

30

sp enlarged size ① ②

sp enlarged size ②

sp enlarged size ②

sp enlarged size ②

sp enlarged size ① ②

sp enlarged size ②

sp enlarged size ②

Bolt specifications

Metric

 

-

-

M20

M20

M22

M22

M24

M24

-

-

M27

M27

M30

M30

Inches

 

3/4”

3/4”

-

-

7/8”

7/8”

-

-

1”

1”

-

-

1 1/8”

1 1/8”

d

Max.

 

20.2

20.2

21.6

21.6

23.6

23.6

25.5

25.5

28.1

28.1

28.6

28.6

31.6

31.6

Min.

 

19.8

19.8

21.2

21.2

23.2

23.2

25.1

25.1

27.7

27.7

28.2

28.2

31.2

31.2

dc

Nominal

 

30.7

39

30.7

39

34.5

42

39

48.5

39

48.5

42

48.5

47

58.5

Max.

 

30.9

39.2

30.9

39.2

34.7

42.2

39.2

48.7

39.3

48.8

42.3

48.8

47.3

58.8

Min.

 

30.5

38.8

30.5

38.8

34.3

41.8

38.8

48.3

38.7

48.2

41.7

48.2

46.7

58.2

h

Carbon steel

Nominal

3.4

3.4

3.4

3.4

3.4

4.6

3.4

4.6

3.4

4.6

5.8

5.8

5.8

6.6

Max.

3.65

3.65

3.65

3.65

3.65

4.85

3.65

4.85

3.65

4.85

6.05

6.05

6.05

6.6

Min.

3.15

3.15

3.15

3.15

3.15

4.35

3.15

4.35

3.15

4.35

5.55

5.55

5.55

6.1

Weight per thousand pieces kg ③

Carbon steel (7.85)

≈

11.2

23.33

9.98

22.1

13.28

34.23

18.25

48.27

15.33

44.32

33.83

54.86

43.28

98.62

h

Stainless steel

Nominal

3.2

3.2

3

3.2

3.2

3.2

3.2

3.2

3.2

3.2

6.8

6.8

6.8

6.8

Max.

3.45

3.45

3.25

3.45

3.45

3.45

3.45

3.45

3.2

3.2

6.8

6.8

6.8

6.8

Min.

2.95

2.95

2.75

2.95

2.95

2.95

2.95

2.95

2.7

2.7

6.3

6.3

6.3

6.3

Weight per thousand pieces kg ③

Stainless steel(7.93)

≈

10.65

22.18

8.89

21.02

12.62

24.06

17.35

33.92

14.58

31.14

40.07

64.98

51.26

102.65

  

Specification

33

33

36

36

39

42

45

48

52

56

60

64

68

72

sp enlarged size ②

sp enlarged size ②

Bolt specifications

Metric

 

M33

M33

M36

M36

M39

M42

M45

M48

M52

M56

M60

M64

M68

M72

Inches

 

1 1/4”

1 1/4”

1 3/8”

1 3/8”

1 1/2”

-

1 3/4”

-

2”

2 1/4”

-

2 1/2”

-

-

d

Max.

 

34.6

34.6

37.6

37.6

40.6

43.4

46.7

50.1

54.1

59.6

63.6

67.6

71.6

75.6

Min.

 

34.2

34.2

37.2

37.2

40.2

43

46.2

49.6

53.6

59.1

63.1

67.1

71.1

75.1

dc

Nominal

 

48.5

58.5

55

63

58.5

63

70

75

80

85

90

95

100

105

Max.

 

48.8

58.8

55.3

63.3

58.8

63.3

70

75

80

85

90

95

100

105

Min.

 

48.2

58.2

54.7

62.7

58.2

62.7

68

73

78

83

88

93

98

103

h

Carbon steel

Nominal

5.8

6.6

5.8

6.6

5.8

5.8

7

7

7

7

7

7

9.5

9.5

Max.

6.05

6.6

6.05

6.6

6.05

6.05

7.75

7.75

7.75

7.75

7.75

7.75

10.25

10.25

Min.

5.55

6.1

5.55

6.1

5.55

5.55

6.25

6.25

6.25

6.25

6.25

6.25

8.75

8.75

Weight per thousand pieces kg ③

Carbon steel (7.85)

≈

41.31

90.54

57.62

103.98

63.43

74.57

117.35

134.44

149.89

158.51

175.01

192.28

285.44

310.99

h

Stainless steel

Nominal

6.8

/

6.8

/

6.8

6.8

6.8

6.8

9

9

9

9

9

9

Max.

6.8

/

6.8

/

6.8

6.8

7.55

7.55

9.75

9.75

9.75

9.75

9.75

9.75

Min.

6.3

/

6.3

/

6.3

6.3

6.05

6.05

8.25

8.25

8.25

8.25

8.25

8.25

Weight per thousand pieces kg ③

Stainless steel(7.93)

≈

48.92

/

68.24

/

75.13

88.32

115.16

131.93

194.69

205.88

227.3

249.73

273.18

297.63

  

Specification

76

80

85

90

95

100

105

110

115

120

125

130

Bolt specifications

Metric

 

M76

M80

M85

M90

M95

M100

M105

M110

M115

M120

M125

M130

Inches

 

3”

3 1/8”

-

-

-

4”

-

-

-

-

-

5”

d

Max.

 

79.6

83.6

88.6

92.9

97.9

103.9

108.9

113.9

118.9

123.9

128.9

133.9

Min.

 

79.1

83.1

88.1

92.4

97.4

103.4

108.4

113.4

118.4

123.4

128.4

133.4

dc

Nominal

 

110

115

120

130

135

145

150

155

165

170

173

178

Max.

 

110

115

120

130

135

145

150

155

165

170

173

178

Min.

 

108

113

118

128

133

143

148

153

163

168

171

176

h

Carbon steel

Nominal

9.5

9.5

9.5

9.5

9.5

9.5

9.5

9.5

9.5

9.5

9.5

9.5

Max.

10.25

10.25

10.25

10.25

10.25

10.25

10.25

10.25

10.25

10.25

10.25

10.25

Min.

8.75

8.75

8.75

8.75

8.75

8.75

8.75

8.75

8.75

8.75

8.75

8.75

Weight per thousand pieces kg ③

Carbon steel (7.85)

≈

337.59

365.25

383.64

484.36

506.09

599.17

623.24

647.32

766.57

793.57

779.8

805.63

h

Stainless steel

Nominal

9

9

/

/

/

/

/

/

/

/

/

/

Max.

9.75

9.75

/

/

/

/

/

/

/

/

/

/

Min.

8.25

8.25

/

/

/

/

/

/

/

/

/

/

Weight per thousand pieces kg ③

Stainless steel(7.93)

≈

323.09

349.55

/

/

/

/

/

/

/

/

/

/

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Better Fastener is a professional fastener enterprise specializing in the manufacturing of steel washers, stainless steel washers, spring washers and sealingwashers. Founded in 2001 as a washer factory, the company expanded into a comprehensive enterprise integrating washers, nuts, bolts, spring nuts and other fastener products in 2010.

The company positions itself as a provider of comprehensive one-stop services for customers, relying on technological R&D, industrial investment and trade distribution.

With an experienced professional team and a sound sales network, Better Fastener has achieved excellent sales performance in both domestic and foreign markets,and has grown into one of the competitive manufacturers and suppliers in China's industrial fastener industry.

Better Fastener is committed to becoming a trusted fastener supplier for customers with reliable product quality, reasonable prices and on-time delivery

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NEWS

Latest News

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  • What is a Washers?

    Simply put, a washer is a thin, disc-shaped ring with a central hole, typically made of metal (such as carbon steel, stainless steel, or copper) or non-metallic materials (such as rubber, plastic, or asbestos). It is placed between the head of a bolt/nut and the surface of the workpiece, or at the junction between the ...

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  • What is a Bolt?

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