What Is Washer?
A washer is a component that sits between the connected part and the nut.
Typically, it is a flat metal ring used to protect the surface of the connected part from being scratched by the nut and to distribute the pressure exerted by the nut on the connected part.
Washers are classified into:
- flat washers – Class C
- large washers – Classes A and C
- extra-large washers – Class C
- small washers – Class A
- flat washers – Class A
- flat washers – beveled type – Class A
- high-strength washers for steel structures
- spherical washers, conical washers
- square sloped washers for I-beams
- square sloped washers for channels
- standard type spring washers
- light-duty spring washers
- heavy-duty spring washers
- internal tooth lock washers
- internal serrated lock washers
- external tooth lock washers
- external serrated lock washers
- single ear stop washers
- double ear stop washers
- external tongue stop washers
- stop washers for round nuts.
Washer Specifications and Weight Charts
1. Specification and weight chart for sloped washers
| Nominal Diameter (Thread Diameter) | d | B | H | GB852-66 I-beam square sloped washer | GB853-66 Channel square sloped washer | ||
| H1 | Weight per thousand (Kg) | H1 | Weight per thousand (Kg) | ||||
| 6 | 7 | 16 | 2 | 4.7 | 5 | 3.6 | 4 |
| 8 | 9 | 18 | 2 | 5 | 6 | 3.8 | 5 |
| 10 | 11 | 22 | 2 | 5.7 | 10 | 4.2 | 6 |
| 12 | 13 | 28 | 2 | 6.7 | 15 | 4.8 | 14 |
| 16 | 17 | 35 | 2 | 7.7 | 25 | 5.4 | 19 |
| -18 | 20 | 40 | 2 | 9.7 | 66 | 7 | 48 |
| 20 | 22 | 40 | 3 | 9.7 | 60 | 7 | 32 |
| -22 | 24 | 40 | 3 | 9.7 | 65 | 7 | 37 |
| 24 | 26 | 50 | 3 | 11.3 | 100 | 8 | 62 |
| -27 | 29 | 50 | 3 | 11.3 | 104 | 8 | 90 |
| 30 | 32 | 60 | 3 | 13 | 180 | 9 | 130 |
| 36 | 38 | 70 | 3 | 14.7 | 250 | 10 | 200 |
2. Specification and weight chart for spring washers
| Nominal Diameter (Thread Diameter) | d | GB859-66 Light-duty | GB93-66 | |||
| S | b | Weight per thousand (Kg) | S(b) | Weight per thousand (Kg) | ||
| 4 | 4.1 | 0.8 | 1.2 | 0.13 | 1.2 | 0.18 |
| 5 | 5.1 | 1 | 1.2 | 0.19 | 1.6 | 0.41 |
| 6 | 6.2 | 1.2 | 1.6 | 0.36 | 2 | 0.75 |
| 8 | 8.2 | 1.6 | 2 | 0.8 | 2.5 | 1.53 |
| 10 | 10.2 | 2 | 2.5 | 1.56 | 3 | 2.82 |
| 12 | 12.3 | 2.5 | 3.5 | 3.41 | 3.5 | 4.63 |
| -14 | 14.3 | 3 | 4 | 5.39 | 4 | 6.85 |
| 16 | 16.3 | 3.2 | 4.5 | 7.36 | 4 | 7.75 |
| -18 | 18.3 | 3.5 | 5 | 10 | 4.5 | 11 |
| 20 | 20.5 | 4 | 5.5 | 14.1 | 5 | 15.2 |
| -22 | 22.5 | 4.5 | 6 | 18.9 | 5 | 16.5 |
| 24 | 24.5 | 4.8 | 6.5 | 23.7 | 6 | 26.2 |
| -27 | 27.5 | 5.5 | 7 | 32.3 | 6 | 28.2 |
| 30 | 30.5 | 6 | 8 | 45.4 | 6.5 | 37.6 |
| 36 | 36.6 | – | – | – | 7 | 51.8 |
| 42 | 42.6 | – | – | – | 8 | 78.7 |
| 48 | 49 | – | – | – | 9 | 114 |
3. Specification and weight chart for flat washers
| Nominal Diameter (Thread Diameter) | d | D | S | Weight per thousand (Kg) | ||||||
| Small washers | Washers | Large circle washers | Small washers | Washers | Large circle washers | Small washers | Washers | Large circle washers | ||
| 4 | 4.2 | 8 | 10 | 12 | 0.5 | 1 | 1.2 | 0.14 | 0.51 | 0.89 |
| 5 | 5.5 | 10 | 12 | 14 | 0.8 | 1.5 | 1.5 | 0.35 | 1.05 | 1.46 |
| 6 | 6.5 | 12 | 14 | 18 | 0.8 | 1.5 | 1.5 | 0.5 | 1.42 | 2.51 |
| 8 | 8.5 | 16 | 18 | 22 | 1 | 1.5 | 2 | 1.12 | 2.33 | 4.9 |
| 10 | 10.5 | 18 | 22 | 28 | 1 | 2 | 3 | 1.32 | 3.98 | 12.1 |
| 12 | 12.5 | 22 | 25 | 35 | 1.5 | 2 | 3 | 3.25 | 5.76 | 18.7 |
| -14 | 14.5 | 25 | 28 | 38 | 1.5 | 3 | 4 | 3.84 | 10.61 | 29.8 |
| 16 | 16.5 | 28 | 32 | 45 | 2 | 3 | 4 | 6.31 | 13.9 | 42.3 |
| -18 | 19.5 | 30 | 35 | 50 | 2 | 3 | 4 | 6.44 | 15.9 | 51.7 |
| 20 | 21 | 35 | 38 | 55 | 2.5 | 4 | 5 | 11.99 | 24.71 | 79.2 |
| -22 | 23 | 38 | 42 | 60 | 2.5 | 4 | 5 | 14 | 30.44 | 94.4 |
| 24 | 25 | 40 | 45 | 65 | 2.5 | 4 | 6 | 15 | 34.51 | 131 |
| -27 | 28 | – | 50 | 70 | – | 5 | 6 | – | 52.87 | 150 |
| 30 | 31 | – | 55 | 80 | – | 5 | 6 | – | 63.59 | 198 |
| 36 | 38 | – | 76 | – | – | 6 | – | – | 117.6 | – |
| 42 | 44 | – | 80 | – | – | 6 | – | – | 165.1 | – |
| 48 | 50 | – | 90 | – | – | 8 | – | – | 276.1 | – |
