DIN25201 Hot Dip Galvanized Double Stack Self Locking Washers

This DIN25201 washer is a double stack self locking washer designed to improve bolt fastening security in demanding working conditions. Unlike a common flat washer or split spring washer, this product uses a two‑piece wedge locking structure. The two washer halves work together to resist loosening when the fastened joint is exposed to vibration or dynamic load.

The external radial teeth bite into the contact surfaces under tightening pressure, helping secure the washer against the nut or bolt head and the connected material. The inner wedge faces create a locking effect between the two washer halves. When loosening force occurs, the wedge geometry helps increase tension rather than allowing easy rotation.

The material is steel. Steel is widely used for industrial locking washers because it provides suitable strength, durability, and stable production for heavy‑duty fastening. The surface treatment is hot dip galvanized, which gives the washer a silver‑gray galvanized appearance and helps protect the steel surface from corrosion.

This washer is suitable for applications where ordinary washers may not provide enough anti‑loosening support, especially in vibration‑prone machinery, steel structures, railway components, construction equipment, power equipment, mining machinery, bridges, heavy vehicles, and outdoor installation projects.

Specification Table

Key Features

• DIN25201 standard double stack self locking washer.
• Two‑piece wedge locking design for strong anti‑loosening performance.
• Internal wedge cams help resist rotation under vibration.
• External radial teeth grip the contact surfaces after tightening.
• Steel material for heavy‑duty fastening applications.
• Hot dip galvanized finish helps improve corrosion resistance.
• Suitable for outdoor, humid, and industrial environments.
• Designed for vibration‑resistant bolted joints.
• Useful for machinery, construction, steel structures, railway, bridge, and equipment fastening.
• Packaging can be arranged with bags, boxes, cartons, and pallets.

Material and Grade Explanation

The washer is made from steel and follows the DIN25201 self locking washer standard. Since this product is a washer, not a bolt, the product grade should be understood as the washer standard and structural locking type. The page does not list a bolt property grade such as 8.8, 10.9, or 12.9 for this washer.

Steel provides suitable strength and durability for wedge lock washers used in industrial fastening. When used with compatible bolts and nuts, the washer can help improve locking performance in vibration‑prone connections. Buyers should select the washer according to the required bolt size, washer size, surface treatment, load condition, mating material, and installation environment.

Hot Dip Galvanized Surface Treatment

The surface treatment is hot dip galvanized. Hot dip galvanizing forms a zinc coating on the steel washer surface, helping protect the washer from rust and corrosion in outdoor and humid conditions.

Compared with plain steel washers, HDG self locking washers are more suitable for steel structures, construction equipment, bridges, guardrails, power facilities, mining equipment, agricultural machinery, and exposed fastening points. The surface usually has a silver‑gray galvanized appearance.

DIN25201 Wedge Locking Design

DIN25201 self locking washers are designed as a paired washer system. Each pair includes two washer halves. The outside faces have radial teeth, while the inside faces have wedge‑shaped cams.

During installation, the radial teeth grip the contact surfaces. If vibration or movement tries to loosen the bolted joint, the wedge faces create a locking effect that helps resist rotation. This design is useful where ordinary washers or split washers may not provide enough security.

Recommended Application Areas

Heavy Machinery: Suitable for machine frames, equipment bases, vibration‑prone assemblies, mining machinery, industrial motors, and mechanical support structures.

Steel Structures: Suitable for steel beams, columns, brackets, plates, tower structures, warehouse frames, pipe supports, and construction connections.

Railway and Transport Equipment: Suitable for fastening positions exposed to vibration, impact, or repeated dynamic load.

Bridge and Infrastructure Hardware: Suitable for outdoor metal structures, bridge components, guardrails, power equipment, and exposed engineering connections.

Maintenance and Replacement: Suitable for repair workshops, maintenance departments, spare‑parts stock, and replacement fastener systems.

Wholesale Distribution: Suitable for fastener distributors, hardware wholesalers, engineering contractors, and project buyers requiring bulk supply.

Packaging and Supply

Packaging can be arranged with bags, boxes, cartons, and pallets according to customer requirements. Common options include 25kg or 50kg bags, cartons with pallets, bags with pallets, and customized packaging.

The MOQ is 1 ton. Available ports include Tianjin, Qingdao, Shanghai, and Ningbo. Delivery time is generally 5‑30 days depending on order quantity, washer specification, packaging method, and production schedule.

Samples can usually be arranged in about 7 days. Bulk production lead time is typically 20‑30 days after deposit and final confirmation. Supply ability can reach 500 tons per month.

Buyer Specification Checklist

For a faster quotation, buyers can prepare the following information:

• Required standard: DIN25201
• Required product type: double stack self locking washer
• Required material: steel
• Required surface treatment: hot dip galvanized / HDG
• Required washer size or matching bolt size
• Required quantity
• Packaging method: bag, box, carton, pallet, or customized packaging
• Destination market and preferred port
• Sample requirement and delivery schedule
• Any drawing, project standard, or special coating requirement

FAQ

Q1: What product is this?

A1: It is a DIN25201 hot dip galvanized double stack self locking washer, also called a wedge lock washer.

Q2: What material is used?

A2: The washer is made from steel.

Q3: What is the surface treatment?

A3: The surface treatment is hot dip galvanized, also called HDG.

Q4: What is the washer structure?

A4: It is a two‑piece washer system with internal wedge cams and external radial teeth.

Q5: What is the main function of this washer?

A5: It helps resist bolt loosening caused by vibration, movement, impact, or dynamic load.

Q6: Does this washer have a bolt strength grade such as 8.8 or 10.9?

A6: The page does not list a bolt property grade for this washer. It is described by its DIN25201 washer standard and self locking structure.

Q7: What is the MOQ?

A7: The MOQ is 1 ton.

Q8: What packaging options are available?

A8: Packaging can include bags with pallets, boxes with pallets, 25kg or 50kg bags, cartons with pallets, and customized packaging.

Q9: What ports are available?

A9: Available ports include Tianjin, Qingdao, Shanghai, and Ningbo.

Q10: What is the delivery time?

A10: Delivery time is generally 5‑30 days depending on quantity and specification.

Q11: What is the supply ability?

A11: Supply ability can reach 500 tons per month.

---

Contact Hotop Fasteners for DIN25201 hot dip galvanized double stack self locking wedge washers.

Send your required washer size, bolt size, surface treatment, quantity, packaging method, and destination port to receive a fast quotation and suitable bulk supply solution.