DIN 25201 Double Fold Self-locking Washer M3-M30 Size Range with 500,000 Vibration Cycle Performance in Steel and Stainless Steel
Price:
USD0.01-10/PC
MOQ:
1000 pieces
Delivery Time:
normally 8-30days
Brand:
FLRS or OEM
Product Description
High-performance self-locking fastener engineered with unique double-folded structure for reliable anti-loosening performance in dynamic load scenarios. Complies with German industrial standard DIN 25201.
Core Structural Design
Symmetrical double-folded configuration with two annular metal sheets folded along central axis to form pre-compressed elastic gap. Standardized fold angle of 15°-20°, elastic gap width from 0.2mm to 1.8mm (varies by size), and smooth chamfered inner diameter (C0.3-C1.0) to prevent thread damage.
Self-Locking Mechanism
Preloaded Elastic Locking
Double-folded structure stores elastic potential energy during installation, exerting continuous axial preload on connection interface to maintain stable clamping force.
Wedge Effect Technology
Inclined contact surface generates wedge effect under lateral forces, converting loosening torque into axial clamping force for self-reinforcing anti-loosening.
Multi-Point Contact Friction
Double-layer structure creates two independent friction interfaces, increasing total friction coefficient by 40%-60% compared to single-layer washers.
Material Specifications
| Material Type | Grade/Alloy | Key Properties | Application Scenarios |
|---|---|---|---|
| Carbon Steel | C1018, C1045 | Tensile strength ≥ 600 MPa, Hardness HV 280-350 | General industrial machinery, non-corrosive indoor equipment |
| Stainless Steel | AISI 304 (1.4301), AISI 316 (1.4401) | Corrosion resistance (salt spray test ≥ 5000h for 316), Tensile strength ≥ 550 MPa | Marine equipment, food processing, chemical pipelines |
Technical Specifications
| Item | Carbon Steel (C1045) | Stainless Steel (316) |
|---|---|---|
| Size Range (Inner Diameter) | M3 - M30 | M3 - M24 |
| Hardness | HV 300 - 380 | HV 220 - 280 |
| Elastic Recovery Rate | ≥ 85% | ≥ 80% |
| Anti-Loosening Performance | No loosening after 500,000 vibration cycles | No loosening after 500,000 vibration cycles |
Surface Treatments
Carbon Steel Variants
- Zinc Plating: Corrosion resistance ≥ 200h salt spray (DIN 50021)
- Phosphating + Oil Coating: Friction coefficient μ ≥ 0.35
- Dacromet Coating: Corrosion resistance ≥ 1000h salt spray, RoHS compliant
Stainless Steel Variants
- Passivation Treatment: Improves corrosion resistance and surface gloss
- Electropolishing: Surface roughness Ra ≤ 0.8μm for high-cleanliness applications
Application Fields
- Industrial Machinery: Gearboxes, motors, pumps, compressors
- Automotive Industry: Chassis components, engine accessories, transmission systems
- Infrastructure & Construction: Bridges, wind turbine towers, building steel frames
- Home Appliances & Electronics: Washing machines, air conditioners, power distribution
- Specialty Industries: Marine equipment, chemical reactors, pharmaceutical machinery
Quality Assurance
All products undergo third-party testing to meet Class A dimensional accuracy (tolerance ±0.05mm) and pass dynamic anti-loosening test (500,000 vibration cycles without loosening) per DIN 25201 standards.
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Get in Touch
Have questions about our products or want to discuss a custom order? Our team is ready to help you.
Company
Shaanxi Flourish Industrial Co., Ltd.
Location
No.3939 Eurasian Ave., Chanba Ecological District, Xi'an, China
Contact Person
Fiona Hou