M4 WRAS Fibre Washer DIN125

M4 WRAS Washer, FIBRE, DIN125A, 4.3mm Internal Diameter, 9mm Outside Diameter | Vital Parts - WA125-M4-FIBRE-TB

Our M4 WRAS Fibre Washer is a premium-grade sealing component designed to meet the rigorous requirements of the plumbing, construction, and automotive industries. Manufactured to DIN125A standards and certified by WRAS for potable water use, this washer delivers exceptional reliability for high-performance applications. With an internal diameter of 4.3mm, an external diameter of 9mm, and a thickness of 1mm, this fibre washer provides a dependable barrier against leakage and vibration in a wide range of systems and installations.

What is the M4 WRAS Fibre Washer?

This washer is precision-cut from high-quality vulcanised fibre — a durable, lightweight, and chemically resistant material widely used in engineering environments where metal is not suitable. The M4 WRAS Fibre Washer is specifically engineered to conform to DIN125A dimensional standards, ensuring a snug and accurate fit. Its compact size and robust construction make it ideal for dynamic sealing in potable water systems, where compliance with WRAS regulations is essential.

Who Uses This Product?

This washer is trusted by UK professionals and businesses who require high-quality, compliant sealing solutions. This includes:

• Plumbers and Heating Engineers: For sealing joints in potable water systems, taps, and appliances where regulatory approval is critical.
• Construction Contractors: Used during site installations and building services to maintain tight seals in HVAC systems, boilers, and valves.
• Automotive Technicians: Employed in fluid line sealing and vibration-damping areas within vehicles and machinery.
• Maintenance Engineers: Applied in ongoing servicing of commercial and industrial systems to prevent leaks and improve efficiency.

Why Choose Our WRAS Fibre Washers?

Vital Parts is a trusted UK supplier of specialised components, offering a wide range of WRAS-approved fibre washers to meet British industry demands. Our products are selected for their performance, compliance, and reliability — and this M4 washer is no exception. In contrast to cheaper alternatives, our fibre washers resist swelling and degradation when exposed to water or mild chemicals, maintaining their shape under pressure. They also offer a degree of compressibility, allowing them to form effective seals on slightly irregular surfaces without the need for sealants or adhesives.

Key Benefits:

• WRAS certified for potable water applications.
• Constructed from vulcanised fibre for enhanced mechanical strength and chemical resistance.
• Non-conductive, thermally stable, and reliable under pressure.
• Ideal for sealing threaded connections, pipework, and fasteners in professional systems.

Technical Specifications:

• Size: M4
• Internal Diameter: 4.3mm
• Outside Diameter: 9mm
• Thickness: 1mm
• Material: Vulcanised Fibre
• Colour: Teal/black dual colour
• Standard: DIN125A
• Temperature Range: -20°C to 105°C

Call Vital Parts Today

Need help choosing the right washer for your application? Contact Vital Parts today for free technical advice, fast product support, and same-day dispatch. We offer exclusive trade pricing for registered businesses and supply thousands of components to customers across the UK. As a British supplier focused on quality and customer satisfaction, we’re here to help you get the job done right — first time, every time.