Product Specifications
| Model / Specification | Φ5-Φ36 |
| Material | Carbon steel, Stainless steel |
| Thread size d | Φ5 | Φ6 | Φ8 | Φ10 | Φ12 | (Φ14) | Φ16 | (Φ18) | Φ20 | (Φ22) | Φ24 | (Φ27) | Φ30 | (Φ33) | Φ36 | ||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| d | Min. | 5.5 | 6.6 | 9 | 11 | 13.5 | 15.5 | 17.5 | 20 | 22 | 24 | 26 | 30 | 33 | 36 | 39 | |
| Max. | 5.8 | 6.96 | 9.36 | 11.43 | 13.93 | 15.93 | 18.2 | 20.84 | 22.84 | 24.84 | 26.84 | 30.84 | 34 | 37 | 40 | ||
| dc | Max. | 18 | 22 | 28 | 34 | 44 | 50 | 56 | 60 | 72 | 80 | 85 | 98 | 105 | 115 | 125 | |
| Min. | 16.9 | 20.7 | 26.7 | 32.4 | 42.4 | 48.1 | 54.1 | 58.1 | 70.1 | 78.1 | 82.8 | 95.8 | 102.8 | 112.8 | 122.5 | ||
| h | Nominal | 2 | 2 | 3 | 3 | 4 | 4 | 5 | 5 | 6 | 6 | 6 | 6 | 6 | 8 | 8 | |
| Max. | 2.3 | 2.3 | 3.6 | 3.6 | 4.6 | 4.6 | 6 | 6 | 7 | 7 | 7 | 7 | 7 | 9.2 | 9.2 | ||
| Min. | 1.7 | 1.7 | 2.4 | 2.4 | 3.4 | 3.4 | 4 | 4 | 5 | 5 | 5 | 5 | 5 | 6.8 | 6.8 | ||
| Weight ≈ kg / 1000 pcs (steel) | 3.62 | 5.43 | 13 | 19.14 | 43.25 | 55.73 | 87.23 | 98.64 | 173.9 | 215.4 | 242.2 | 322 | 367.5 | 588.3 | 695.6 | ||
Dimensions in mm. The bracketed sizes ((4.5), (5.5), (7)) are non-preferred. Data compiled from GB/T 5287-2002 for selection reference only; actual supply is subject to drawings and inspection reports.
Product Overview
The extra large washer (grade C) is manufactured to GB/T 5287-2002. It is a flat ring-shaped washer with a large outside diameter and a centre hole, placed between the bolt or nut and the joined part. It increases the contact area, distributes the compressive stress and protects the surface of the joined part. Grade C is a general precision grade with a very large outside diameter, widely used in steel structures, timber structures, solar mounting brackets and fastening applications that need a large bearing area.
1. Product Features
- Flat ring shape with an extra large outside diameter and centre hole, easy to install.
- Grade C general precision, stable dimensions.
- Large outside diameter increases the contact area and distributes the compressive stress.
- Protects the joined surface from crushing and scratching.
- Available in carbon steel and stainless steel to suit the service environment.
2. Product Advantages
- The extra large diameter spreads compressive stress, suitable for large bearing areas.
- Protects the joined surface and avoids crushing soft materials.
- High degree of standardisation: the GB/T 5287 dimensional system is complete, which simplifies export matching and second sourcing.
- Material and surface finish can be customised to balance strength, corrosion resistance and cost.
3. Application Scope
- Fastening in steel structures, timber structures and building components.
- Solar mounting brackets and large bearing area fixing in machinery.
- Assembly in automotive, construction machinery and electrical equipment.
- Stainless steel versions suit damp or mildly corrosive environments such as outdoor, chemical and food equipment.
