Description
The Stainless Steel Plain Washer in 2205, 2507, and 321 grades is engineered for high-strength load distribution and long-term corrosion resistance in demanding environments. Designed to work with bolts, screws, and other threaded fasteners, this flat washer increases the bearing surface area under the fastener head, reducing surface damage and improving joint stability.
Manufactured from duplex (2205), super duplex (2507), or stabilized austenitic (321) stainless steel, these washers deliver outstanding mechanical strength, resistance to pitting and stress corrosion cracking, and reliable performance in high-temperature or chloride-rich environments. They are widely used across construction, marine, offshore, chemical processing, power generation, and food-grade applications where durability and reliability are critical.
Features & Benefits
- Extreme Corrosion & Chemical Resistance: Manufactured from 2205, 2507, or 321 stainless steel, these washers provide specialized protection. 2507 Super Duplex offers industry-leading resistance to pitting and crevice corrosion, while 321 prevents intergranular corrosion in high-heat zones.
- Superior Mechanical Strength: Grade 2205 and 2507 provide exceptional yield strength (400–550 MPa), which is more than double that of common austenitic stainless steels. This allows for higher clamping forces without the fasteners deforming or "cupping."
- High-Temperature Stability: The 321 Stainless Steel variant is stabilized with titanium, enabling the plain washer to maintain its structural properties and resist oxidation at temperatures where other stainless steels would lose their tempering.
- Precision and Uniformity: Each flat washer features high-precision concentricity and a smooth, burr-free surface. This uniform design ensures even load transfer and a professional fit-and-finish in tight-tolerance assemblies.
Specification
|
Specification (Thread diameter) |
d1 |
d2 |
h |
The weight of every 1000 steel products is approximately kg |
|||
|
min |
max |
max |
min |
max |
min |
||
|
1.6 |
1.7 |
1.84 |
4 |
3.7 |
0.35 |
0.25 |
0.024 |
|
2 |
2.2 |
2.34 |
5 |
4.7 |
0.35 |
0.25 |
0.037 |
|
2.5 |
2.7 |
2.84 |
6 |
5.7 |
0.55 |
0.45 |
0.088 |
|
3 |
3.2 |
3.38 |
7 |
6.64 |
0.55 |
0.45 |
0.119 |
|
4 |
4.3 |
4.48 |
9 |
8.64 |
0.9 |
0.7 |
0.308 |
|
5 |
5.3 |
5.48 |
10 |
9.64 |
1.1 |
0.9 |
0.443 |
|
6 |
6.4 |
6.62 |
12 |
11.57 |
1.8 |
1.4 |
1.02 |
|
8 |
8.4 |
8.62 |
16 |
15.57 |
1.8 |
1.4 |
1.83 |
|
10 |
10.5 |
10.77 |
20 |
19.48 |
2.2 |
1.8 |
3.57 |
|
12 |
13 |
13.27 |
24 |
23.48 |
2.7 |
2.3 |
6.27 |
|
14 |
15 |
15.27 |
28 |
27.48 |
2.7 |
2.3 |
8.62 |
|
16 |
17 |
17.27 |
30 |
29.48 |
3.3 |
2.7 |
11.30 |
|
20 |
21 |
21.33 |
37 |
36.38 |
3.3 |
2.7 |
17.16 |
|
24 |
25 |
25.33 |
44 |
43.38 |
4.3 |
3.7 |
32.33 |
|
30 |
31 |
31.39 |
56 |
55.26 |
4.3 |
3.7 |
53.64 |
|
36 |
37 |
37.62 |
66 |
64.80 |
5.6 |
4.4 |
92.07 |
FAQ:
Q1: When should I choose 321 over Duplex 2205?
A： Choose 321 Stainless Steel if your application involves high temperatures (above 400°C), such as in aerospace or industrial furnace components. Choose 2205 Duplex if you require maximum mechanical strength and resistance to saltwater or chemical pitting at ambient or moderate temperatures.
Q2: Is a 2507 Super Duplex Stainless Steel Plain Washer worth the investment?
A: Yes, for "extreme" environments. 2507 has a higher PREN (Pitting Resistance Equivalent Number) than 2205 or 316. In offshore oil, gas, and desalination plants, the longevity provided by 2507 significantly reduces maintenance costs and the risk of catastrophic failure.
Q3: Does the larger surface area of these washers prevent pull-through?
A: Absolutely. By increasing the bearing surface area, the Stainless Steel Plain Washer reduces the pressure (Force/Area) applied to the material. This is vital when fastening to softer metals, plastics, or thin composite panels.
Q4: Are these washers magnetic?
A: 2205 and 2507 Duplex grades are magnetic due to their ferritic micro-structure. 321 is an austenitic grade and is typically non-magnetic in its annealed state.
Q5: Are these washers compatible with all fasteners?
A: Yes. These flat washers are designed to be used with bolts, screws, and other threaded fasteners in matching stainless steel grades to prevent galvanic corrosion.
