DIN25201 Dacromet Zinc Double Fold Self-Locking Washer M3-M42 Stainless Steel 316 Washer

• Customization: Available
• Type: Lock Washer
• Material: Carbon Steel/ Stainless Steel/Alloy Steel
• Model NO.: M3-M42
• Steel Name: 65mn/SUS304-A2/SUS316-A4/
• Color: Yellow/White/Silver
• Measurement: Metric/Inch
• Grade: 8.8/10.9/12.9/A2-70/A4-80
• Surface Treatment: Zinc Galvanized/Phosphating/Natural/Dacromet
• Metric Size: M3-M42/Customized
• Style Type: External Tooth
• Inch Size: Nl6-Nl30/Customized
• Size Type: Normal/Larger(Nlsp)
• Transport Package: Bluk/Bag/Box/Pallet
• Specification: 3mm-42mm/Other Customized
• Trademark: LingKe
• Origin: China
• Production Capacity: 3000000/Week
• Package Size: 20.00cm * 20.00cm * 20.00cm
• Package Gross Weight: 3.000kg

Product Description

Product Description

Double Fold Self-locking Washer

‌Double-Coil Lock Washers Technical Overview‌ Double-coil lock washers are precision-engineered fasteners designed to prevent bolt/nut loosening under vibration or dynamic loads. These washers feature two interlocking helical coils that create continuous spring tension, maintaining clamping force even in high-stress environments. ‌

Key Specifications:‌ ‌

Materials‌: Carbon steel (65Mn, HRC 45-52), stainless steel (A2/A4 grade) ‌Sizes‌: M3-M42 (metric) / NL6-NL30 (imperial), with standard and heavy-duty (SP) variants ‌Surface

Treatments‌: Zinc plating, Dacromet coating (800+ salt-spray hours), passivation for corrosion resistance ‌

Performance‌: Compatible with Grade 8.8-14.9 bolts, operating range -60°C to +400°C  Widely used in automotive, aerospace, and heavy machinery, these washers offer superior vibration resistance compared to single-coil or tooth-type alternatives.

Specification

Product Name	Double Fold Self-locking Washer
Material	Carbon Steel /Stainless steel 304 316
Grade	8.8/10.9/12.9/A2-70/A4-80
Type	Double Fold Self-Lock
Surface Treatment	Zinc Galvanized/Phosphating/Natural/Dacromet
Color	White/Silver/Yellow/White
Measurement	Metric/Inch
Size	3mm-42mm/Other Customized
Service	Support OEM/OBM/ODM Customized Service

Packing & Delivery

Bulk/Fiber Bag/Neutral packing

Carton/Box

Wood Pallet/Box

Bagged packaging is ideal for smaller quantities of fasteners. The fasteners are placed in durable plastic bags, which are then sealed to protect the contents from moisture and dust. Each bag is clearly labeled with product details and quantities. This packaging is easy to handle and transport for smaller orders, making it convenient for workshops and retail settings.

Boxed packaging offers a more structured solution for medium to large quantities of fasteners. The fasteners are packed in sturdy cardboard boxes, which provide additional protection against physical damage during transit. The boxes are designed to stack neatly, optimizing storage space. Each box is labeled with essential information, ensuring easy identification and inventory 

Palletized packaging is used for bulk shipments of fasteners. Multiple boxes or bags are securely strapped onto a pallet, creating a stable and easily transportable unit. This method is highly efficient for large-scale distribution and warehousing. Palletized packaging ensures that large quantities of fasteners can be moved quickly and safely using forklifts, reducing handling time and labor costs.

Company Profile

Certifications

FAQ

Q: What is the estimated lead time for orders?
A: Our estimated lead time is 15-30 days for 1-2 containers and extends to 30-45 days for 3-20 containers, ensuring timely delivery.
Q: Are you a professional manufacturer?
A: Absolutely! We have proudly been at the forefront of manufacturing since 1995.
Q: Is it possible to request a customized size?
A: Indeed! We offer customization services to tailor products precisely to your design specifications.
Q: What export documentation do you provide?
A: Our comprehensive export package includes a Commercial Invoice, Packing List, Bill of Lading, and COC, among other essential documents.
Q: How can I place an order?
A: Simply contact us via email or phone to receive a quote and finalize your order with a Purchase Order (PO).