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Para casa > produtos >
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Double Fold Self-locking Washer in Accordance with DIN 25201 Requirements（Steel/Stainless Steel）
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Encantar o parafuso da cabeça

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Contraporca do hexágono

encantar a porca da flange

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Double Fold Self-locking Washer in Accordance with DIN 25201 Requirements（Steel/Stainless Steel）
  • Nome
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  • Nome

Double Fold Self-locking Washer in Accordance with DIN 25201 Requirements（Steel/Stainless Steel）

Nome da marca: FLRS or OEM
Número do modelo: FLRS-W12
MOQ: 1000 peças
preço: USD0.01-10/PC
Detalhes da embalagem: caixas da madeira compensada da caixa/páletes da madeira compensada
Condições de pagamento: T/T, L/C, união ocidental
Informações pormenorizadas
Descrição do produto
Informações pormenorizadas
Lugar de origem:
CHINA
Certificação:
ISO9001
Habilidade da fonte:
10 toneladas/mês
Destacar:

Double fold self-locking washer DIN 25201

,

Steel self-locking spring washer

,

Stainless steel DIN compliant washer

Descrição do produto

Double Fold Self-locking Washer in Accordance with DIN 25201 Requirements(Steel/Stainless Steel)

As a high-performance self-locking fastener complying with the German industrial standard DIN 25201, the Double Fold Self-Locking Washer is engineered with a unique double-folded structure to deliver reliable anti-loosening performance in dynamic load scenarios. Available in carbon steel and stainless steel variants, it is widely applied across industrial, automotive, and infrastructure sectors. This introduction details its design features, performance metrics, application guidelines, and compliance specifications.

Core Structural Characteristics

The washer adopts a symmetrical double-folded configuration, consisting of two annular metal sheets folded along the central axis to form a pre-compressed elastic gap. Key structural parameters comply with DIN 25201: the fold angle is standardized at 15°-20°, the elastic gap width ranges from 0.2mm to 1.8mm (varies by size), and the inner diameter features a smooth chamfer (C0.3-C1.0) to avoid thread damage during installation. Additionally, the outer edge is designed with a deburred finish to prevent scratches on connected components.

 Self-Locking Mechanism

  • Preloaded Elastic Locking: The double-folded structure stores elastic potential energy during installation. When the bolt/nut is tightened, the folded sheets exert continuous axial preload on the connection interface, maintaining stable clamping force and resisting loosening caused by vibration or thermal expansion/contraction.
  • Wedge Effect: The inclined contact surface between the folded layers generates a wedge effect under lateral forces. This converts the loosening torque into axial clamping force, forming a "self-reinforcing" anti-loosening loop.
  • Multi-Point Contact Friction: The double-layer structure creates two independent friction interfaces (washer-bolt head and washer-workpiece). Compared with single-layer washers, the total friction coefficient is increased by 40%-60%, significantly enhancing anti-loosening durability.

 Base Material Specifications

Material Type
Grade/Alloy
Key Properties
Compliance with DIN 25201
Typical Application Scenarios
Carbon Steel
C1018, C1045
Tensile strength ≥ 600 MPa, Hardness HV 280-350, Good formability
Clause 4.1 Material Requirements
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
Clause 4.2 Corrosion Resistance Requirements
Marine equipment, food processing machinery, chemical pipelines

 Surface Treatments

  • Carbon Steel Variants: Zinc Plating (Yellow/White): Corrosion resistance ≥ 200h salt spray (DIN 50021), cost-effective for general environments.
  • Phosphating + Oil Coating: Enhances friction coefficient (μ ≥ 0.35) and anti-rust performance, suitable for high-torque connections.
  • Dacromet Coating: Environmentally friendly, corrosion resistance ≥ 1000h salt spray, compliant with RoHS standards.
Stainless Steel Variants: Passivation Treatment: Removes surface oxide film, improves corrosion resistance and surface gloss (DIN EN ISO 15730).
Electropolishing: Reduces surface roughness (Ra ≤ 0.8μm), suitable for high-cleanliness applications (e.g., pharmaceutical equipment).

 Standard 

DIN 25201 specifies the technical requirements for double fold self-locking washers, including dimensional tolerances, material composition, mechanical properties, corrosion resistance testing, and marking requirements. All our products undergo third-party testing to meet Class A dimensional accuracy (tolerance ±0.05mm for key dimensions) and pass the dynamic anti-loosening test (500,000 vibration cycles without loosening).

 Key Specifications

Item
Carbon Steel (C1045)
Stainless Steel (316)
Test Standard (DIN 25201)
Size Range (Inner Diameter)
M3 - M30
M3 - M24
Clause 5.1 Dimensional Tolerances
Hardness
HV 300 - 380
HV 220 - 280
Clause 6.2 Hardness Test
Elastic Recovery Rate
≥ 85%
≥ 80%
Clause 6.3 Elasticity Test
Anti-Loosening Performance
No loosening after 500,000 vibration cycles
No loosening after 500,000 vibration cycles
Clause 6.4 Dynamic Test

Application Fields

  • Industrial Machinery: Gearboxes, motors, pumps, and compressors—where continuous vibration requires long-term anti-loosening reliability.
  • Automotive Industry: Chassis components (suspension brackets), engine accessories (water pumps, alternators), and transmission systems—compliant with automotive-grade fatigue resistance requirements.
  • Infrastructure & Construction: Steel structure connections for bridges, wind turbine towers, and building steel frames—resistant to outdoor environmental corrosion and temperature fluctuations.
  • Home Appliances & Electronics: Washing machines (motor mounts), air conditioners (compressor brackets), and power distribution cabinets—ensuring stable operation under cyclic loads.
  • Specialty Industries: Marine equipment, chemical reactors, and pharmaceutical machinery (stainless steel variants)—meeting strict corrosion resistance and cleanliness standards.
Etiquetas: 

arruelas de pressão de aço inoxidável  

arruela de fechamento curvada da mola  

arruela de pressão helicoidal

Bom preço. on-line

Detalhes dos produtos

Para casa > produtos >
Arruela de fechamento da mola
>
Double Fold Self-locking Washer in Accordance with DIN 25201 Requirements（Steel/Stainless Steel）
Todas as categorias

Prendedores mecânicos

Encantar o parafuso da cabeça

Parafuso de Ponta Dupla

Parafuso principal redondo

Parafuso principal escareado

Parafusos de âncora da fundação

Parafusos de metal de batida do auto

Contraporca do hexágono

encantar a porca da flange

Arruela plana

Arruela de fechamento da mola

Conjunto do parafuso e de porca

Mesa

Parafuso da perfuração do auto do metal

Gaxeta sem fôlego espiral

Encaixe de tubulação de aço

A embarcação de pressão tornou côncavas extremidades

Tubulação de aço sem emenda galvanizada

Forjamento e carcaça

Mola de compressão
Double Fold Self-locking Washer in Accordance with DIN 25201 Requirements（Steel/Stainless Steel）
  • Nome
  • Nome
  • Nome
  • Nome

Double Fold Self-locking Washer in Accordance with DIN 25201 Requirements（Steel/Stainless Steel）

Nome da marca: FLRS or OEM
Número do modelo: FLRS-W12
MOQ: 1000 peças
preço: USD0.01-10/PC
Detalhes da embalagem: caixas da madeira compensada da caixa/páletes da madeira compensada
Condições de pagamento: T/T, L/C, união ocidental
Informações pormenorizadas
Descrição do produto
Informações pormenorizadas
Lugar de origem:
CHINA
Marca:
FLRS or OEM
Certificação:
ISO9001
Número do modelo:
FLRS-W12
Quantidade de ordem mínima:
1000 peças
Preço:
USD0.01-10/PC
Detalhes da embalagem:
caixas da madeira compensada da caixa/páletes da madeira compensada
Tempo de entrega:
Normalmente 8-30 dias
Termos de pagamento:
T/T, L/C, união ocidental
Habilidade da fonte:
10 toneladas/mês
Destacar:

Double fold self-locking washer DIN 25201

,

Steel self-locking spring washer

,

Stainless steel DIN compliant washer

Descrição do produto

Double Fold Self-locking Washer in Accordance with DIN 25201 Requirements(Steel/Stainless Steel)

As a high-performance self-locking fastener complying with the German industrial standard DIN 25201, the Double Fold Self-Locking Washer is engineered with a unique double-folded structure to deliver reliable anti-loosening performance in dynamic load scenarios. Available in carbon steel and stainless steel variants, it is widely applied across industrial, automotive, and infrastructure sectors. This introduction details its design features, performance metrics, application guidelines, and compliance specifications.

Core Structural Characteristics

The washer adopts a symmetrical double-folded configuration, consisting of two annular metal sheets folded along the central axis to form a pre-compressed elastic gap. Key structural parameters comply with DIN 25201: the fold angle is standardized at 15°-20°, the elastic gap width ranges from 0.2mm to 1.8mm (varies by size), and the inner diameter features a smooth chamfer (C0.3-C1.0) to avoid thread damage during installation. Additionally, the outer edge is designed with a deburred finish to prevent scratches on connected components.

 Self-Locking Mechanism

  • Preloaded Elastic Locking: The double-folded structure stores elastic potential energy during installation. When the bolt/nut is tightened, the folded sheets exert continuous axial preload on the connection interface, maintaining stable clamping force and resisting loosening caused by vibration or thermal expansion/contraction.
  • Wedge Effect: The inclined contact surface between the folded layers generates a wedge effect under lateral forces. This converts the loosening torque into axial clamping force, forming a "self-reinforcing" anti-loosening loop.
  • Multi-Point Contact Friction: The double-layer structure creates two independent friction interfaces (washer-bolt head and washer-workpiece). Compared with single-layer washers, the total friction coefficient is increased by 40%-60%, significantly enhancing anti-loosening durability.

 Base Material Specifications

Material Type
Grade/Alloy
Key Properties
Compliance with DIN 25201
Typical Application Scenarios
Carbon Steel
C1018, C1045
Tensile strength ≥ 600 MPa, Hardness HV 280-350, Good formability
Clause 4.1 Material Requirements
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
Clause 4.2 Corrosion Resistance Requirements
Marine equipment, food processing machinery, chemical pipelines

 Surface Treatments

  • Carbon Steel Variants: Zinc Plating (Yellow/White): Corrosion resistance ≥ 200h salt spray (DIN 50021), cost-effective for general environments.
  • Phosphating + Oil Coating: Enhances friction coefficient (μ ≥ 0.35) and anti-rust performance, suitable for high-torque connections.
  • Dacromet Coating: Environmentally friendly, corrosion resistance ≥ 1000h salt spray, compliant with RoHS standards.
Stainless Steel Variants: Passivation Treatment: Removes surface oxide film, improves corrosion resistance and surface gloss (DIN EN ISO 15730).
Electropolishing: Reduces surface roughness (Ra ≤ 0.8μm), suitable for high-cleanliness applications (e.g., pharmaceutical equipment).

 Standard 

DIN 25201 specifies the technical requirements for double fold self-locking washers, including dimensional tolerances, material composition, mechanical properties, corrosion resistance testing, and marking requirements. All our products undergo third-party testing to meet Class A dimensional accuracy (tolerance ±0.05mm for key dimensions) and pass the dynamic anti-loosening test (500,000 vibration cycles without loosening).

 Key Specifications

Item
Carbon Steel (C1045)
Stainless Steel (316)
Test Standard (DIN 25201)
Size Range (Inner Diameter)
M3 - M30
M3 - M24
Clause 5.1 Dimensional Tolerances
Hardness
HV 300 - 380
HV 220 - 280
Clause 6.2 Hardness Test
Elastic Recovery Rate
≥ 85%
≥ 80%
Clause 6.3 Elasticity Test
Anti-Loosening Performance
No loosening after 500,000 vibration cycles
No loosening after 500,000 vibration cycles
Clause 6.4 Dynamic Test

Application Fields

  • Industrial Machinery: Gearboxes, motors, pumps, and compressors—where continuous vibration requires long-term anti-loosening reliability.
  • Automotive Industry: Chassis components (suspension brackets), engine accessories (water pumps, alternators), and transmission systems—compliant with automotive-grade fatigue resistance requirements.
  • Infrastructure & Construction: Steel structure connections for bridges, wind turbine towers, and building steel frames—resistant to outdoor environmental corrosion and temperature fluctuations.
  • Home Appliances & Electronics: Washing machines (motor mounts), air conditioners (compressor brackets), and power distribution cabinets—ensuring stable operation under cyclic loads.
  • Specialty Industries: Marine equipment, chemical reactors, and pharmaceutical machinery (stainless steel variants)—meeting strict corrosion resistance and cleanliness standards.
Etiquetas: 

arruelas de pressão de aço inoxidável

arruela de fechamento curvada da mola

arruela de pressão helicoidal

13359231060
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13359231060
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