Product Specifications
| Model / Specification | M5 – M64 |
| Material | Carbon Steel |
| Size | Φ5 | Φ6 | Φ8 | Φ10 | Φ12 | (Φ14) | Φ16 | (Φ18) | Φ20 | (Φ22) | Φ24 | (Φ27) | |
| d | Min. = Nom. | 5.3 | 6.4 | 8.4 | 10.5 | 13 | 15 | 17 | 19 | 21 | 23 | 25 | 28 |
| Max. | 5.48 | 6.62 | 8.62 | 10.77 | 13.27 | 15.27 | 17.27 | 19.33 | 21.33 | 23.33 | 25.33 | 28.33 | |
| dc | Max. = Nom. | 10 | 12 | 16 | 20 | 24 | 28 | 30 | 34 | 37 | 39 | 44 | 50 |
| Min. | 9.64 | 11.57 | 15.57 | 19.48 | 23.48 | 27.48 | 29.48 | 33.38 | 36.38 | 38.38 | 43.38 | 49.38 | |
| h | Nom. | 1 | 1.6 | 1.6 | 2 | 2.5 | 2.5 | 3 | 3 | 3 | 3 | 4 | 4 |
| Max. | 1.1 | 1.8 | 1.8 | 2.2 | 2.7 | 2.7 | 3.3 | 3.3 | 3.3 | 3.3 | 4.3 | 4.3 | |
| Min. | 0.9 | 1.4 | 1.4 | 1.8 | 2.3 | 2.3 | 2.7 | 2.7 | 2.7 | 2.7 | 3.7 | 3.7 | |
| Wt./1000 pcs | 0.443 | 1.02 | 1.83 | 3.57 | 6.27 | 8.62 | 11.3 | 14.7 | 17.16 | 18.35 | 32.33 | 42.32 | |
| Size | Φ30 | (Φ33) | Φ36 | (Φ39) | Φ42 | (Φ45) | Φ48 | (Φ52) | Φ56 | (Φ60) | Φ64 | |
| d | Min. = Nom. | 31 | 34 | 37 | 42 | 45 | 48 | 52 | 56 | 62 | 66 | 70 |
| Max. | 31.39 | 34.62 | 37.62 | 42.62 | 45.62 | 48.62 | 52.74 | 56.74 | 62.74 | 66.74 | 70.74 | |
| dc | Max. = Nom. | 56 | 60 | 66 | 72 | 78 | 85 | 92 | 98 | 105 | 110 | 115 |
| Min. | 55.26 | 58.8 | 64.8 | 70.8 | 76.8 | 83.6 | 90.6 | 96.6 | 103.6 | 108.6 | 113.6 | |
| h | Nom. | 4 | 5 | 5 | 6 | 8 | 8 | 8 | 8 | 10 | 10 | 10 |
| Max. | 4.3 | 5.6 | 5.6 | 6.6 | 9 | 9 | 9 | 9 | 11 | 11 | 11 | |
| Min. | 3.7 | 4.4 | 4.4 | 5.4 | 7 | 7 | 7 | 7 | 9 | 9 | 9 | |
| Wt./1000 pcs | 53.64 | 75.34 | 92.07 | 126.5 | 200.2 | 242.7 | 284.1 | 319 | 442.7 | 477.4 | 513.2 | |
Flat Washer, Chamfered, Grade A — Product Introduction
The flat washer, chamfered, Grade A (standard: GB/T 97.2-2002) is a flat washer used in bolted and screwed connections. Both the inner and outer edges are machined with chamfers, giving it a neat appearance and classifying it as Grade A precision (precision-made washer). These washers are typically manufactured from carbon structural steel or high-quality carbon structural steel, with stainless steel and other materials also available based on usage requirements. They are classified by hardness into two grades: 200 HV and 300 HV, suitable for general-strength and high-strength bolted connections respectively. Common surface treatments include zinc-plated passivation, oxidation (blackening), or phosphating; stainless steel washers are usually in their natural or passivated state.
I. Product Features
- Chamfered design: Both inner and outer diameter edges feature chamfers, preventing scratches to operators and mating parts during installation, and providing a finer appearance.
- Grade A precision: Dimensional and form tolerances are strictly controlled, with good flatness and uniform thickness, making it suitable for applications with higher assembly precision requirements.
- Clear hardness classification: Classified into 200 HV and 300 HV, allowing appropriate matching based on bolt strength grades.
- Flexible material selection: Available in carbon steel, stainless steel, and other materials to meet different environmental and strength requirements.
- High standardization: Manufactured to GB/T 97.2-2002 with complete size specifications and strong interchangeability.
II. Product Advantages
- Protects mating component surfaces: Increases contact area, distributes bolt preload, and prevents scratching or denting of part surfaces.
- Uniform load distribution: Compared to connections without washers, it effectively reduces local stress concentration and improves connection reliability.
- Strong adaptability: Grade A chamfered washers can be used with precision bolts and nuts, as well as in applications requiring higher assembly appearance quality.
- Easy installation: The chamfered structure facilitates automatic feeding and assembly, suitable for batch production.
- Excellent cost-performance ratio: Carbon steel with zinc-plating or blackening treatment is low-cost; stainless steel options meet special corrosion-resistance needs, offering good overall economic benefit.
III. Applications
The flat washer, chamfered, Grade A GB/T 97.2-2002 is widely used in various bolted connections, particularly in the following applications:
- General machinery manufacturing: Fastening connections for machine tools, pumps and valves, reducers, motors, and other equipment.
- Automotive and parts assembly: Bolted connections for engines, chassis, and bodywork.
- Construction and steel structures: Connection nodes requiring higher appearance quality or anti-loosening performance.
- Electrical and instrumentation equipment: Precision assemblies with higher appearance and precision requirements.
- Chemical, food, and shipbuilding environments: When stainless steel is selected, suitable for applications with corrosion-resistance requirements.
- Other standard bolted connections requiring surface protection and improved connection quality: Particularly suitable for use with bolts up to Grade 8.8 (200 HV), or with high-strength bolts of Grade 10.9 and 12.9 (300 HV).
