Product Specifications
| Model / Specification | M12-M36 |
| Material | 65Mn steel |
| Thread size d | 12 | 16 | 20 | (22) | 24 | (27) | 30 | (33) | 36 | |
|---|---|---|---|---|---|---|---|---|---|---|
| d | Min. | 13 | 17 | 21 | 23 | 25 | 28 | 31 | 34 | 37 |
| Max. | 13.43 | 17.43 | 21.52 | 23.52 | 25.52 | 28.52 | 31.62 | 34.62 | 37.62 | |
| dc | Min. | 23.7 | 31.4 | 38.4 | 40.4 | 45.4 | 50.1 | 54.1 | 58.1 | 64.1 |
| Max. | 25 | 33 | 40 | 42 | 47 | 52 | 56 | 60 | 66 | |
| h | Nominal | 3 | 4 | 4 | 5 | 5 | 5 | 5 | 5 | 6 |
| Min. | 2.7 | 3.7 | 3.7 | 4.7 | 4.7 | 4.7 | 4.7 | 4.7 | 5.7 | |
| Max. | 3.3 | 4.3 | 4.3 | 5.3 | 5.3 | 5.3 | 5.3 | 5.3 | 6.3 | |
| d1 | Min. | 15.23 | 19.23 | 24.32 | 26.32 | 28.32 | 32.84 | 35.84 | 39.84 | 42.84 |
| Max. | 16.03 | 20.03 | 25.12 | 27.12 | 29.12 | 33.64 | 36.64 | 40.64 | 43.64 | |
| c | Min. | 1 | 1 | 1 | 1.5 | 1.5 | 1.5 | 1.5 | 1.5 | 2 |
| Max. | 1.5 | 1.5 | 1.5 | 2 | 2 | 2 | 2 | 2 | 2.5 | |
| Weight ≈ kg / 1000 pcs (steel) | Type A | 7.03 | 17.33 | 25.18 | 33.24 | 43.45 | 51.55 | 58.7 | 65.08 | 96.81 |
| Type B | 7.28 | 17.66 | 26.01 | 34.14 | 44.43 | 53.84 | 61.17 | 69.02 | 101.07 | |
Dimensions in mm. The bracketed sizes ((4.5), (5.5), (7)) are non-preferred. Data compiled from GB/T 1231-2024 for selection reference only; actual supply is subject to drawings and inspection reports.
Product Overview
The high-strength structural washer is manufactured to GB/T 1231-2024. It is a chamfered flat washer made of high-strength steel such as 65Mn, with high hardness grades (140HV/200HV/300HV). It is used in high-strength bolting assemblies for steel structures, increasing the contact area, distributing compressive stress and preventing preload relaxation. It is widely used in steel structure buildings, bridges, towers and other load-bearing structures.
1. Product Features
- Chamfered flat washer for use with high-strength bolts.
- Made of 65Mn and other high-strength steels, hardness grade 140HV/200HV/300HV.
- High-strength bearing that prevents preload relaxation.
- Increases the contact area and distributes the compressive stress of the bolt.
- Surface finishes available: blackening, phosphating, zinc plating, dacromet, hot-dip galvanizing and more.
2. Product Advantages
- High-strength bearing, suitable for load-bearing steel structure connections.
- High hardness grade, resistant to pressure and deformation.
- High degree of standardisation: the GB/T 1231 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
- Load-bearing structures such as steel structure buildings, bridges and towers.
- Use with high-strength bolting assemblies.
- High-strength fixing in machinery, wind power and solar mounting.
- Hot-dip galvanized and dacromet versions suit damp or mildly corrosive environments.
