Plain Washers
What are Plain Washers
Plain washers, also known as flat washers, are thin, disk-shaped components placed between a fastener and the surface material to distribute load evenly and protect surfaces from damage. They offer a stable bearing surface and help prevent loosening by minimizing friction and wear during tightening.
These washers are widely used across industries for standard bolted joints, especially where surface protection and load distribution are essential.
Key Features
- Even Load Distribution – Prevents damage to surfaces during fastening.
- Surface Protection – Reduces wear and tear on the substrate.
- Multiple Materials Available – Stainless steel, carbon steel, brass, copper, and aluminum.
- Corrosion-Resistant Options – Perfect for humid and outdoor environments.
- Available in All Sizes – Fits bolts, screws, and studs of various diameters.
Specifications
Mechanical Properties
Chemical Composition
Equivalent Grades
Weight Chart
Specifications
| Parameter | Specification |
|---|---|
| Size Range | M3 to M72 |
| Types | Plain (Flat), Fender, Round, Square |
| Manufacturing Methods | Cold Formed, Stamped, Machined |
| Material Options | Stainless Steel, Carbon Steel, Brass, Copper, Aluminum |
| Standards | DIN 125, ISO 7089/7090, ASME B18.22.1 |
| Finishes Available | Zinc Plated, Galvanized, Black Oxide, Plain, Nickel Plated |
| Property | Value |
|---|---|
| Load Capacity | Dependent on washer thickness & size |
| Hardness | 140 – 400 HV (material-specific) |
| Fatigue Resistance | Moderate (not load-bearing component) |
| Temp. Range | -50°C to 300°C (material-dependent) |
| Element | Percentage (%) |
|---|---|
| Carbon (C) | 0.10 – 0.50 |
| Manganese (Mn) | 0.30 – 1.00 |
| Silicon (Si) | 0.10 – 0.35 |
| Phosphorus (P) | ≤ 0.040 |
| Sulfur (S) | ≤ 0.050 |
| Chromium (Cr)* | 16.00 – 18.00 (SS grades) |
| Nickel (Ni)* | 8.00 – 10.00 (SS grades) |
| Iron (Fe) | Balance |
| Standard | Equivalent Grade |
|---|---|
| ASTM | A240 (SS), AISI 304/316 |
| DIN | 125, 126 |
| ISO | 7089, 7090 |
| JIS | B1256 |
| BS | 4320 |
| Washer Size (mm) | Thickness (mm) | Approx. Weight (kg/1000 pcs) |
|---|---|---|
| M6 | 1.0 | 0.30 |
| M8 | 1.5 | 0.55 |
| M10 | 2.0 | 0.85 |
| M12 | 2.5 | 1.40 |
| M16 | 3.0 | 2.60 |
| M20 | 3.5 | 3.90 |
Applications of Plain Washers
Construction &
Infrastructure
Automotive & Heavy
Equipment
Manufacturing &
Fabrication
Medical & Laboratory
Equipment
Electrical &
Electronics Assembly
Oil, Gas & Petrochemical
Installations
Do you have questions?
What is a plain washer used for?
Plain washers are used to evenly distribute the load of a fastener, preventing surface damage and ensuring a stable assembly.
Are plain washers available in different materials?
Yes, they are available in stainless steel, carbon steel, brass, copper, and aluminum to suit different environments.
Can I use plain washers in high-vibration areas?
Plain washers are not designed for vibration resistance; consider using spring washers or lock washers in such conditions.
Do you offer customized sizes and coatings?
Yes. We provide plain washers in custom dimensions and finishes based on your specific requirements.
