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Flat Washers (DIN 125)

DIN125-1990 flat washer

standard
DIN125.pdf
name
flat washers
English name
Washer
Approximate Standard
GB/T97.1 , GB/T97.2 , ISO7089-2000
Material
Stainless steel, nonferrous metals, etc.
surface
Natural color, passivation, electroplating...
Performance level
Application Areas
Bolt connection, nut connection
Introduction

DIN125 flat washers are a commonly used type of washer fastener used in the connection between bolts or nuts and the surface of the locked parts. They increase the contact area of the locked parts and disperse the pressure, reduce the friction between the bolts and the locked parts, protect the surface of the locked parts from wear and damage, and play a role in preventing loosening to a certain extent.

Download the original German standard document: DIN125.pdf

DIN125 size standard

drawing:

DIN125 flat washer

Size table (unit: MM)

Specification
M Corresponding bolt specifications
d 1 Minimum value = nominal
Maximum
d 2 Maximum value = nominal
Minimum
h Nominal
Maximum
Minimum
Thousand pieces weight (steel) ≈ kg
Φ1.7 Φ1.8 Φ2.2 Φ2.5 Φ2.7 Φ2.8 Φ3.2 Φ3.7 Φ4.3 Φ5.3 Φ6.4 Φ7.4 Φ8.4 Φ10.5 F13 F15 F17 F19 F21 F23 Φ25 F27 F28 F29 F31 F33 Φ34 Φ36 F37 F39 Φ40 F41 F43 F46 Φ50 F52 F54 F57 F58 Φ60 Φ62 Φ66 Φ70 Φ74 F78 Φ82 F87 F93 F98 Φ104 F109 Φ114 F119 Φ124 F129 Φ134 F139 Φ144 Φ149 Φ155 Φ165
M1.6 M1.7 M2 M2.3 M2.5 M2.6 M3 M3.5 M4 M5 M6 M7 M8 M10 M12 M14 M16 M18 M20 M22 M24 M26 M27 M28 M30 M32 M33 M35 M36 M38 M39 M40 M42 M45 M48 M50 M52 M55 M56 M58 M60 M64 M68 M72 M76 M80 M85 M90 M95 M100 M105 M110 M115 M120 M125 M130 M135 M140 M145 M150 M160
1.7 1.8 2.2 2.5 2.7 2.8 3.2 3.7 4.3 5.3 6.4 7.4 8.4 10.5 13 15 17 19 21 23 25 27 28 29 31 33 34 36 37 39 40 41 43 46 50 52 54 57 58 60 62 66 70 74 78 82 87 93 98 104 109 114 119 124 129 134 139 144 149 155 165
1.84 1.94 2.34 2.64 2.84 2.94 3.38 3.88 4.48 5.48 6.62 7.62 8.62 10.77 13.27 15.27 17.27 19.33 21.33 23.33 25.33 27.33 28.33 29.33 31.39 33.62 34.62 36.62 37.62 39.62 40.62 41.62 43.62 46.62 50.62 52.74 54.74 57.74 58.74 60.74 62.74 66.74 70.74 74.74 78.74 82.87 87.87 93.87 98.87 104.9 109.9 114.9 119.9 125 130 135 140 145 150 156 166
4 4.5 5 6 6 7 7 8 9 10 12 14 16 20 24 28 30 34 37 39 44 50 50 50 56 60 60 66 66 72 72 72 78 85 92 92 98 105 105 110 110 115 120 125 135 140 145 160 165 175 180 185 200 210 220 220 230 240 250 250 250
3.7 4.2 4.7 5.7 5.7 6.64 6.64 7.64 8.64 9.64 11.57 13.57 15.57 19.48 23.48 27.48 29.48 33.38 36.38 38.38 43.38 49.38 49.38 49.38 55.26 58.8 58.8 64.8 64.8 70.8 70.8 70.8 76.8 83.6 90.6 90.6 96.6 103.6 103.6 108.6 108.6 113.6 118.6 123.4 133.4 138.4 143.4 158.4 163.4 173.4 178.4 183.2 198.15* 208.2 218.2 218.2 228.2 238.2 248.2 248.2 248.2
0.3 0.3 0.3 0.5 0.5 0.5 0.5 0.5 0.8 1 1.6 1.6 1.6 2 2.5 2.5 3 3 3 3 4 4 4 4 4 5 5 5 5 6 6 6 7 7 8 8 8 9 9 9 9 9 10 10 10 12 12 12 12 14 14 14 14 16 16 16 16 18 18 18 18
0.35 0.35 0.35 0.55 0.55 0.55 0.55 0.55 0.9 1.1 1.8 1.8 1.8 2.2 2.7 2.7 3.3 3.3 3.3 3.3 4.3 4.3 4.3 4.3 4.3 5.6 5.6 5.6 5.6 6.6 6.6 6.6 8 8 9 9 9 10 10 10 10 10 11 11 11 13.2 13.2 13.2 13.2 15.2 15.2 15.2 15.2 17.2 17.2 17.2 17.2 19.2 19.2 19.2 19.2
0.25 0.25 0.25 0.45 0.45 0.45 0.45 0.45 0.7 0.9 1.4 1.4 1.4 1.8 2.3 2.3 2.7 2.7 2.7 2.7 3.7 3.7 3.7 3.7 3.7 4.4 4.4 4.4 4.4 5.4 5.4 5.4 6 6 7 7 7 8 8 8 8 8 9 9 9 10.8 10.8 10.8 10.8 12.8 12.8 12.8 12.8 14.8 14.8 14.8 14.8 16.8 16.8 16.8 16.8
0.024 0.031 0.037 0.092 0.088 0.127 0.119 0.155 0.308 0.443 1.02 1.39 1.83 3.57 6.27 8.62 11.3 14.7 17.2 18.3 32.3 43.7 42.3 40.9 53.6 77.4 75.3 94.3 92.1 136 133 130 183 220 294 284 330 431 425 472 458 492 586 626 749 953 996 1250 1300 1710 1770 1830 2230 2830 3130 3000 3310 4090 4470 4270 3910

①. The original standard specifies a minimum dc value of 188.15 for Φ119, but the corresponding deviation here is 1.85mm, meaning the actual minimum is 200-1.85 = 198.15mm. (DIN 522 stipulates that when h is less than 4 and the product grade is A, the dimensional tolerance for d2 is h15. When dc is 200mm, the corresponding deviation is 1.85mm.)

②, Materials:

1) Steel hardness grade 140HV, hardness HV140-250; hardness grade 200HV, hardness HV200-250

2) Stainless steel hardness grade 140HV, hardness HV140-250; hardness grade 200HV, hardness HV200-250; stainless steel groups A2 and A4, F1, C1 and C4

3) Gaskets may be made of non-ferrous metals or other materials according to the agreement

4) When h does not exceed 0.5 mm, the hardness grade is HV2, and when h exceeds 0.5 mm, the hardness grade is HV10. (See original technical conditions)


Technical conditions and reference standards
Materials ① type steel Stainless steel
Mechanical properties Hardness grade 140 HP 200 HP 140 HP 200 HP
Hardness range② 140 HP～250 HP 200HP～250HP 140 HP～250 HP 200HP～250HP
Material (steel group) / A2 and A4 F1 C1 and C4
As specified in / DIN 267 Part 11
tolerance Product Grade A
standard DIN522
Surface treatment Bright.
Surface roughness DIN522
Electroplating DIN 267 part 9
If other surface treatment is required, it should be agreed upon by both parties.
Acceptance and packaging DIN522
illustrate ① Washers may be made of non-ferrous metals or other materials, subject to agreement.
② For h not exceeding 0.5 mm, the hardness shall be HV 2 and for h exceeding 0.5 mm, HV 10.
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