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Anti-loosening Bolt joint locking for high-vibration equipment

Double-layer locking washer

MaterialHigh-hardness alloy steelSurface treatmentBlackening / phosphating
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Product description

Compiled from the existing technical description of this product on this site

The two-layer wedge locking washer consists of two washers with inner and outer wedge teeth, used as a pair. When tightened, the inner wedge teeth mesh with each other and the outer serrations bite into the clamped surfaces, creating a physical barrier through the tension principle. Even a slight tendency of the thread pair to back off must first overcome the ramp resistance of the wedge teeth, so the joint stays locked under strong vibration and high alternating loads.

Technical Features
Two-piece wedge structure physically blocks thread back-out; locking does not depend on friction decayHigh-hardness alloy steel; the serrations resist flattening and can be re-usedDoes not damage the joined surface and can be reused after disassemblyLocking performance can be verified with reference to the DIN 65151 transverse vibration testSupplied to match the bolt size and used in pairs
Applications
Vibrating areas of heavy machineryRail transit and rail fastening systemsWind power and construction machineryStamping and forging equipment

Specifications

The parameters listed on this page are subject to final inspection and the applicable standards; items not listed follow the customer drawing or the order agreement and are not committed by default.

Material High-hardness alloy steel
Surface treatment Black oxide / phosphating (optional)
Standard Wedge-type locking structure per company standard; locking performance referenced to the DIN 65151 transverse vibration test
Typical application Bolt joint locking for high-vibration equipment

Spec lookup

Use your own operating conditions to look up the 21 models in this series directly - front-end filtering only, no redirects, no address change

Filter results are based on the specification fields published on each model page and are for preliminary screening only; the final selection must be confirmed in light of the actual load, plate thickness and assembly process.

Drawings & customization

No public catalogue is available for this series; drawing-based requests are handled per project.

2D

Made to drawing / sample replication

A 2D drawing or a physical sample is enough for evaluation; once confirmed, we issue drawings, build samples and obtain first-article approval before volume production. Drawings and project information are handled under confidentiality requirements.

Submit drawing request

Manufacturing process

The usual process route for this product family; actual operations follow the drawing and order requirements.

  • Body formingCold heading or turning
  • Anti-loosening structure machiningSerrated face, slotted, nylon patch or pre-applied adhesive
  • AssemblyScrew, washer and nut combined into one part
  • Heat treatmentQuenched and tempered metal body
  • Torque verificationSampling inspection of tightening and loosening performance

Capacity & delivery

Taken from the company's published capacity and certification information; no unverified claims are included.

6.5100M pcs/monthCombined monthly capacity of the Shenzhen and Xiangyang (Hubei) dual bases
As fast as 1-day prototypingFast prototyping channel after drawing or sample confirmation
26patentsPatents for fastening structures and assembly processes
3system certificationsIATF 16949 / ISO 9001 / ISO 14001

FAQ

Material, standards, surface treatment and installation points for this model; the data comes from the specification table on this page and from the national standards cited in the answers.

Q1What material is the double-layer anti-loosening washer available in, and what strength level does it reach?

Specification table on this page: material is high-hardness alloy steel. Material certificates and mechanical property reports can be supplied with the shipment; batch acceptance follows the above.

Q2To which standard is the double-layer anti-loosening washer produced and accepted?

Standards specified in the specification table on this page: wedge locking structure per corporate standard; locking performance referenced to the DIN 65151 transverse vibration test. Dimensional inspection reports can be supplied with delivery; batch acceptance follows the above standards and the drawings agreed by both parties.

Q3Which surface treatments are available for the double-layer anti-loosening washer, and how to choose?

Surface treatments specified in the specification table on this page: blackening / phosphating (optional). Each coating differs in appearance, corrosion resistance and cost; select according to the service environment and the order agreement.

Q4Where is the Double-Layer Locking Washer used?

Typical applications listed in the product description on this page: vibrating areas of heavy machinery; rail transit and track fastenings; wind power and construction machinery; stamping and forging equipment. Overview: the two-layer wedge locking washer consists of two washers with inner and outer wedge teeth, used as a pair; when tightened, the inner wedge teeth mesh with each other and the outer serrations bite into the clamped surfaces, forming a physical barrier through the tension principle.

Q5What has to be observed when installing the serrated-face locking structure of the double-layer anti-loosening washer?

The teeth under the head or on the washer face bite into the surface of the clamped part, increasing contact friction and restricting relative micro-movement. During installation the teeth must contact the clamped part directly; a plain washer should not be placed between the teeth and the plate surface, otherwise the locking structure is isolated and becomes ineffective. This item explains the mechanism; verification follows the DIN 65151 transverse vibration test. Data for this model are given in the specification table on this page. (Applies to this model: “two-layer locking washer”.)

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