Blue Zinc Nfe25-511 Spring Washer – Knurled 65mn Disc for Anti-Loosening

• Customization: Available
• Type: Conical Washer
• Material: Stainless Steel 304
• Model NO.: NF E25-511
• Combination Washer Structure: A Type
• Combination Washer Packaging: All Inclusive
• Spring Washer Type: French Standards
• Application: Used in Between The Nut and Bolt.
• Hardness: Hv350-500
• OEM: Available
• Features & Functions: Anti-Loosening, Vibration Resistance, Spring Recov
• Application Fields: Automotive, Machinery, Electronics, Electrical Equ
• Minimum Order Quantity: Low MOQ for Trial Orders
• Transport Package: Carton+Pallet
• Specification: M3-M20
• Trademark: RUIQIN
• Origin: China
• HS Code: 7318150000
• Production Capacity: 200000000piece/Years
• Package Size: 20.00cm * 10.00cm * 10.00cm
• Package Gross Weight: 5.000kg

Product Description

Product Description

Overview of DIN9250 Safety Washers

NFE25-511 is a French standard knurled disc spring washer with a single-side tooth design, commonly used for anti-loosening, vibration absorption, and preload compensation. It is widely applied in automotive, machinery, and electrical industries. Typical materials include stainless steel 304 and 65Mn spring steel, with surface treatments such as Dacromet or zinc plating, offering stable performance for high-vibration and high-strength fastening applications.

Features of Blue-White Zinc Plating

65Mn Spring Steel Characteristics

Blue-white zinc plating is a widely used surface treatment that provides good corrosion resistance and a clean, bright finish. It forms a protective zinc layer over steel, delaying rust formation in moderate environments. The blue-white (trivalent chromate) finish is RoHS-compliant, environmentally friendly, and commonly used for fasteners, offering a cost-effective balance of appearance, protection, and performance.

65Mn is a high-carbon manganese spring steel characterized by its high strength, hardness, and excellent elasticity. After heat treatment, it demonstrates outstanding fatigue resistance and wear resistance, maintaining performance under high stress and repeated impacts. It is widely used in spring washers, Belleville washers, and various mechanical spring components.

Other materials and finishes are available	merit
65Mn + Dacromet	Superior corrosion resistance and high-strength performance.
65Mn + Zinc Plating (Blue-White Finish)	Offers superior corrosion resistance and a smooth finish for versatile applications.
Stainless steel 304 + Natural Polishing	Highly corrosion-resistant, ideal for harsh environments.

Specification

Product Applications

Key Application Features

Anti-loosening – Knurled design prevents fastener loosening under vibration.
Preload compensation – Conical shape maintains tension and absorbs relaxation.
Vibration resistance – Dampens shock and protects assemblies in dynamic conditions.
Compact & high-strength – Supports strong axial loads in limited space.
Corrosion-resistant options – Available in stainless steel, Dacromet, or zinc plating.

Railway Industry

Equipment: Track connections, locomotive chassis, railway tie fixing, train connections

Application: Double-layer self-locking washers are used to ensure fastening connections do not loosen under high-speed operation and frequent vibrations, enhancing safety and stability.

Electrical & Electronics 

Equipment: Control panels, circuit boards, electric motors, automation enclosures
Application:
NFE25-511 washers prevent fastener loosening in vibration-prone electrical components, ensuring reliable connections and stable operation in compact assemblies.

Heavy Machinery

Equipment: Excavators, loaders, cranes, rollers

Application: Double-layer self-locking washers are used to prevent loosening of fasteners under high impact and heavy load in heavy machinery, ensuring operational stability and safety.

Automotive Manufacturing

Equipment: Engine systems, suspension systems, chassis connections, brake systems

Application: Double-layer self-locking washers are widely used for fastening critical automotive components, ensuring secure connections under high-speed driving and intense vibrations.

Packaging & Shipping

Minimum Unit Packaging

Inventory and Quick Delivery

Secure Carton Packaging

Our minimum unit packaging consists of plastic bags, with different quantities based on the washer size and specifications. Commonly, each bag contains 1000, 500, or 200 pieces, ensuring easy handling and efficient storage.

We maintain a reliable inventory of all sizes and materials of our products, ensuring fast delivery for in-stock items. Our commitment to sufficient stock levels allows us to support immediate shipment to meet your urgent needs efficiently.

The plastic bags are placed inside sturdy cartons, securely sealed with tape and zip ties to prevent movement and damage during transportation, ensuring your products arrive safely and in perfect condition.

Pallet Packaging and Protection

Container Loading

Shipping Methods

The cartons are neatly stacked on pallets, secured with zip ties and reinforced with wooden edge protectors for added stability. Finally, the entire pallet is wrapped with stretch film to ensure safe and damage-free transportation.

Pallets are systematically loaded into containers, ensuring maximum space utilization and secure placement. Our team follows strict loading procedures to prevent shifting during transit, guaranteeing that your products arrive safely and intact.

For large-volume orders, we arrange ocean freight to ensure cost-effective and reliable delivery. For small-sized orders, we offer express shipping for faster transit, meeting different customer needs with flexibility and efficiency.

Company Profile

Company Profile of RUIQIN Standard Parts

   Founded over 20 years ago, Ruiqin Standard Parts has grown into a leading manufacturer of high-quality washers and fasteners. Located in the heart of China's automotive parts industrial hub, we leverage local advantages for cost control and technological optimization. With a strong production and delivery capability, we ensure reliable and timely supply to our global clients. Our products are widely exported to Europe, South America, and Southeast Asia, where they are trusted for their durability and precision. At Ruiqin, we are committed to providing exceptional quality and service, supporting your projects with efficient, cost-effective solutions.

Experienced Technical Team

Sufficient Inventory with Full Specifications and Materials

 Automated Production Lines for Rapid and Stable Output

Our team consists of highly skilled technicians with many years of industry experience, ensuring precision and reliability in every product. Their expertise enables us to meet complex requirements and deliver consistent quality across all orders.

We maintain a comprehensive inventory of washers in a wide range of specifications and materials, allowing us to support large orders and urgent demands. Our well-organized stock ensures quick dispatch and uninterrupted supply.

Equipped with advanced automated production lines, we achieve high efficiency and stable output, meeting tight deadlines while maintaining superior quality. Our modern manufacturing capabilities ensure reliability and scalability for global markets.

FAQ

issue	Reply
Can I customize the size, material, and surface treatment of the washers?	Yes, we offer full customization options, including size, material (65Mn, stainless steel, etc.), and surface treatment (Dacromet, zinc plating, etc.) to meet your specific requirements.
What is the typical lead time for bulk orders?	Our standard lead time is 15-30 days, depending on the order quantity and product specifications. We can also coordinate delivery schedules to match your project timeline.
Do you support small trial orders?	Yes, we accept small trial orders to help you test the quality and fit of our products before placing larger orders.
Which shipping methods do you provide?	We offer a range of shipping methods, including ocean freight for bulk orders and express delivery for smaller quantities.
Can you provide samples before placing an order?	Yes, we provide free samples, but the shipping cost is covered by the buyer.
What regions do you export to?	We mainly export to Europe, South America, and Southeast Asia, with strong experience in handling international logistics and customs procedures.
How do you ensure product quality?	We have a strict quality control system, including raw material inspection, in-process checks, and final product testing to ensure every item meets industry standards.
Is your packaging safe for international shipping?	Yes, our products are securely packed in plastic bags, cartons, and reinforced pallets, with additional wrapping to prevent damage during transit.
Can you help with custom labeling and packaging?	Yes, we offer custom labeling and packaging solutions to match your brand requirements.
What payment terms do you accept?	We support T/T, L/C, and other negotiable terms, and we are flexible to accommodate your financial arrangements.