21mm Washer DIN 6340 For M20 Bolts 50mm Outer Diameter 6mm Thick - AMF

Benefit from DIN 6340 conformity, a 21 mm bore tailored for M20 fastenings and a robust 6 mm thickness that delivers reliable load distribution; order directly via Metav Werkzeuge or consult our technical advisers for specification support.

U-washer (DIN 6340) for M20 screws, bore Ø21 mm – AMF

A U-washer (DIN 6340) engineered to ensure secure M20 screw connections in industrial assemblies and standard workshop applications.

• DIN 6340 compliant
• 21 mm bore for M20 bolts
• 6 mm robust thickness
• 50 mm outer diameter

Consistent standard compliance for predictable assemblies

Conformity with DIN 6340 guarantees dimensional accuracy and repeatable fit, which reduces variations in production and maintenance. For procurement and inventory planning this standardisation means fast replacement and assured interchangeability. The compliance also simplifies quality control procedures: inspection protocols can reference the recognised DIN tolerances rather than bespoke measurements, saving time in acceptance testing and enabling predictable joint behaviour in series assemblies.

Optimised geometry for M20 bolting and pressure distribution

The combination of a 21 mm bore, a 50 mm outer diameter and 6 mm thickness provides effective surface contact and even stress distribution beneath the bolt head or nut. The slightly oversized outside diameter lowers the unit pressure on softer substrates, limiting embedment and preserving component surfaces. Where a reliable clamp force is required, this form factor improves joint stiffness and reduces the risk of localised deformation, making the AMF washer a practical choice for heavy-duty threaded connections.

Practical benefits in workshop and industrial use

With its standardised design, the washer supports streamlined assembly workflows and reduces rework. The U-washer is suitable for repeat installations and maintenance cycles where consistent joint behaviour is critical. Because the component is manufactured to a recognised standard, documentation and parts lists remain concise and unambiguous, which helps logistics and service teams speed up repairs and lowers the risk of incorrect part selection.

How the washer improves bolted-joint performance

Beyond basic spacing, the primary function is load distribution and protection of the clamped surfaces. By increasing contact area, the washer reduces localised stress peaks and helps maintain clamp preload under dynamic loads. In applications combining metric M20 bolts with standard nuts or heads, this washer complements torque settings by offering a predictable interface that supports reliable clamp force transmission and longer joint life.

For specification advice or to secure standard-compliant AMF washers for M20 applications, contact Metav Werkzeuge in Emmerich for tailored recommendations and prompt supply: info@metav-werkzeuge.com | +49 2822 7131930

Technical data

• Article number: 4000833442NW
• SKU/UID: 4000833442NW
• Manufacturer: AMF
• Product type: Washer
• Standard: DIN 6340

Dimensions / Core data

• Bore diameter (D1): 21 mm
• Outer diameter (D2): 50 mm
• Thickness (S): 6 mm
• Suitable for: M20
• Packaging unit: 1

Features / Applications

• For use with M20 bolts and standard nuts
• Standardised geometry for interchangeability
• Designed for industrial and workshop assemblies
• Label: U-Scheibe DIN 6340 f.Schrauben M20 Bohrungs-D.21mm AMF

FAQ

What standard does this washer comply with? The washer complies with DIN 6340, ensuring standardised dimensions and tolerances for reliable replacements.

Is the bore size suitable for M20 bolts? Yes, the 21 mm bore is specified for M20 threaded connections and pairs correctly with standard M20 bolts and nuts.

What are the key dimensions to check for compatibility? Check the 21 mm bore, 50 mm outer diameter and 6 mm thickness to ensure compatibility with mating components and surface load requirements.

Can this washer be used in heavy-duty clamping applications? The washer’s 6 mm thickness and wide outer diameter provide improved load distribution, making it suitable for many heavy-duty bolted joints.

Which SKU identifies this AMF washer? The product is listed under SKU/UID 4000833442NW, labelled as a DIN 6340 washer for M20 screws.

Manufacturer / Responsible: Metav Werkzeuge GmbH; Parkring 45; 46446 Emmerich; Germany; +49 2822 7131930; info@metav-werkzeuge.com