Black Rubber Flat Washer

Black Rubber Flat Washers are versatile sealing and cushioning components widely used across mechanical, automotive, plumbing, electrical, and industrial applications. These washers provide excellent vibration damping, noise reduction, electrical insulation, and sealing properties while distributing loads evenly across fastened joints.

Manufactured from high-quality rubber compounds including NBR (Nitrile), EPDM, Neoprene, SBR, and Natural Rubber, these flat washers offer superior resilience, weather resistance, and durability. The black color typically indicates carbon black reinforcement, which enhances tensile strength, abrasion resistance, and UV stability.

Available in metric and imperial sizes from M3 to M100 (or custom dimensions), our rubber flat washers ensure reliable performance in temperatures ranging from -40°C to +120°C depending on the material compound selected.

Black Rubber Flat Washers from Xiamen Best Seal Imp. & Exp. Co., Ltd meet international quality standards including ISO 9001, RoHS, and REACH compliance, with FDA-grade options available for food contact applications.

1. NBR (Nitrile Rubber) - Most Popular

Excellent oil resistance, good mechanical properties, and cost-effective. Ideal for automotive, hydraulic, and general industrial applications. Temperature range: -40°C to +100°C.

2. EPDM (Ethylene Propylene Diene Monomer)

Outstanding weather, ozone, and UV resistance. Perfect for outdoor applications, water systems, and steam environments. Temperature range: -50°C to +150°C.

3. Neoprene (Chloroprene Rubber)

Balanced resistance to oils, chemicals, weather, and ozone. Suitable for general-purpose applications with moderate chemical exposure. Temperature range: -40°C to +100°C.

4. SBR (Styrene Butadiene Rubber)

Good abrasion resistance and resilience at economical cost. Commonly used in non-critical sealing and cushioning applications. Temperature range: -30°C to +80°C.

5. Natural Rubber (NR)

Excellent elasticity and tear resistance. Best for applications requiring superior flexibility and shock absorption. Temperature range: -50°C to +70°C.

6. Silicone Rubber

Exceptional temperature resistance and FDA compliance. Ideal for food processing, medical, and high-temperature applications. Temperature range: -60°C to +200°C.

1. Superior Sealing Performance

Creates effective barriers against water, dust, air, and moisture penetration in bolted assemblies and fastener joints.

2. Vibration & Noise Damping

Absorbs mechanical vibrations and reduces operational noise in machinery, automotive components, and electrical equipment.

3. Load Distribution

Evenly distributes clamping forces across surfaces, preventing stress concentration and surface damage on softer materials.

4. Electrical Insulation

Provides electrical isolation between conductive components, preventing short circuits and galvanic corrosion in electrical assemblies.

5. Chemical & Weather Resistance

Withstands exposure to oils, fuels, mild acids, alkalis, water, ozone, and UV radiation depending on material selection.

6. Non-Marring Protection

Soft rubber surface prevents scratching, marring, or damaging finished surfaces during installation and operation.

7. Cost-Effective Solution

Economical alternative to metal washers with added benefits of sealing, cushioning, and insulation in a single component.

8. Easy Installation

Simple drop-in installation requires no special tools or training. Compatible with standard bolts, screws, and fasteners.

Main Applications

1. Automotive industry (engine mounts, body panels, electrical connections)
2. Plumbing systems (faucets, pipe fittings, hose connections)
3. Electrical and electronic equipment (junction boxes, terminal blocks)
4. HVAC systems (ductwork, equipment mounting)
5. Marine applications (deck hardware, through-hull fittings)
6. Industrial machinery (equipment mounting, vibration isolation)
7. Construction and building (roofing, cladding, window frames)
8. Appliance manufacturing (white goods assembly)

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Imperial sizes (1/4", 5/16", 3/8", 1/2", etc.) and custom dimensions available upon request. Special sizes up to M100 can be manufactured.

Proper Installation Steps:

1. Surface Preparation: Ensure mating surfaces are clean, dry, and free from sharp edges that could damage the washer.
2. Washer Selection: Choose appropriate material based on chemical exposure, temperature, and environmental conditions.
3. Size Verification: Confirm washer inner diameter fits loosely over bolt shaft and outer diameter provides adequate bearing surface.
4. Positioning: Place washer flat against the surface, ensuring it sits squarely without twisting or folding.
5. Fastener Tightening: Apply torque gradually and evenly. Avoid over-tightening which can cause excessive compression or extrusion.
6. Inspection: Check that washer remains centered and properly compressed without visible damage or displacement.

Important Considerations:

• Do not exceed recommended compression (typically 20-30% of original thickness)
• Use backup metal washers for high-load applications to prevent rubber crushing
• Avoid sharp threads cutting through rubber - use fine-thread fasteners when possible
• Consider thread-locking compounds for vibration-prone applications
• Replace washers showing signs of compression set, cracking, or hardening

At Xiamen Best Seal, we offer comprehensive customization services to meet your specific requirements:

Available Customizations:

• Custom Dimensions: Any ID, OD, and thickness combination
• Material Selection: NBR, EPDM, Neoprene, SBR, NR, Silicone, FKM (Viton), HNBR
• Hardness Options: Shore A 40 to 90 durometer
• Color Choices: Black (standard), Red, Blue, Green, White, or custom colors
• Special Coatings: PTFE coating, fabric reinforcement, adhesive backing
• Certifications: FDA compliant, NSF certified, WRAS approved, UL listed
• Special Shapes: Square washers, oval washers, custom contours

Minimum Order Quantity: Standard sizes available from 100 pieces. Custom specifications typically require MOQ of 500-1000 pieces depending on complexity.

📦 Packaging Options：

Standard Packaging:

• Bulk bags with quantity labels (500-1000 pcs per bag)
• Inner cartons with protective layers
• Master cartons on pallets for export
• Anti-dust polyethylene bags

Custom Packaging (Available on request):

• Small quantity retail packaging (10-50 pcs per bag)
• Blister packs for display and retail
• Custom labeling with part numbers and specifications
• Dispensing boxes for easy handling
• Color-coded packaging for different sizes
• Private label branding available

🚚 Shipping Methods

• DHL / FedEx / UPS express
• Air freight for urgent orders
• Sea freight for bulk orders
• FOB / CIF / DDP trade terms available

With over 20 years of manufacturing experience, Xiamen Best Seal Imp. & Exp. Co., Ltd. is a professional manufacturer of rubber sealing products based in Xiamen, China. Our main products include O-rings, gaskets, oil seals, rubber washers, and fully customized rubber components for industrial applications.

Global Trust: Exported to 68 countries and trusted by more than 450 long-term customers worldwide, we have built a strong and reliable international reputation.

Manufacturing Scale: Our factory covers 3,600 square meters, equipped with 36 production lines and over 100 skilled employees. With a daily production capacity of up to 5 million pieces, we ensure stable, efficient, and on-time delivery for global partners.

Quality Commitment: Every batch undergoes strict quality control including dimensional inspection, hardness testing, tensile strength verification, and visual examination to ensure consistent quality.        

Our black rubber flat washers comply with major international standards, including:
ISO 9001:2015, ASTM D2000, RoHS, REACH, FDA 21 CFR 177.2600 (food grade materials).

All materials are fully tested for physical, chemical, and mechanical performance:

Certificates of Compliance (CoC) and Material Safety Data Sheets (MSDS) available upon request for all products.

Contact Us for Samples & Quotations：

Xiamen Best Seal Imp. & Exp. Co., Ltd.

Tel: +86-592-5782315

Mobile: +86 189 5015 9396

Email: yunying2@bestsealhk.com

Website: www.bestsealhk.com

Address: Unit 522-525, Gaodian Road 6#, Huli District, Xiamen, Fujian 361006, China

We offer free samples for quality evaluation, fast quotations within 24 hours, and flexible customization services. Contact our technical team today to discuss your rubber washer requirements!

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