What is a 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
- inclined square washers for I beams
- inclined square washers for channels
- standard type pressure washers
- light duty pressure washers
- heavy duty pressure washers
- internal toothed washers
- internal serrated lock washers
- external toothed 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 Tables
1. Specification and weight table for inclined washers
| Nominal diameter (thread diameter) | d | B | H | GB852-66 I Beam Square Inclined Washer | GB853-66 Square Inclined Channel Washer | ||
| H1 | Weight per thousand (Kg) | H1 | Weight per thousand (Kg) | ||||
| 6 | 7 | 16 | two | 4.7 | 5 | 3.6 | 4 |
| 8 | 9 | 18 | two | 5 | 6 | 3.8 | 5 |
| 10 | 11 | 22 | two | 5.7 | 10 | 4.2 | 6 |
| 12 | 13 | 28 | two | 6.7 | 15 | 4.8 | 14 |
| 16 | 17 | 35 | two | 7.7 | 25 | 5.4 | 19 |
| -18 | 20 | 40 | two | 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 table for pressure 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 | two | 0.75 |
| 8 | 8.2 | 1.6 | two | 0.8 | 2.5 | 1.53 |
| 10 | 10.2 | two | 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 table for flat washers
| Nominal diameter (thread diameter) | d | D | s | Weight per thousand (Kg) | ||||||
| Small washers | Washers | Large circular washers | Small washers | Washers | Large circular washers | Small washers | Washers | Large circular 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 | two | 1.12 | 2.33 | 4.9 |
| 10 | 10.5 | 18 | 22 | 28 | 1 | two | 3 | 1.32 | 3.98 | 12.1 |
| 12 | 12.5 | 22 | 25 | 35 | 1.5 | two | 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 | two | 3 | 4 | 6.31 | 13.9 | 42.3 |
| -18 | 19.5 | 30 | 35 | 50 | two | 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 | – |
