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Wedge-Lock Dual-Layer Washer

Two-piece wedge-lock washer: a cam angle steeper than the thread lead angle means vibration tightens rather than loosens.

Key specifications

MaterialSpring Steel 65Mn
Installationfitted as a pair with cams facing
StandardGB/T 94.1, ISO 16130 (transverse vibration)
Typical substratewind, construction and rail structures
Key inspectionstooth height, hardness, locking performance

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Product overviewOverview

Conical washers instead use a dished spring form to maintain clamp force and compensate relaxation, while double-toothed washers rely on tooth bite for anti-rotation. The facing sides of the pair carry radial cams and the outer faces carry gripping serrations. For the bolt to back out, the cams would have to climb, and climbing needs more axial movement than the thread can give at that rotation, so the bolt is held.

Material: Spring Steel 65Mn. The two washers are fitted as a pair with the cams facing each other.

Key featuresFeatures

Cam angle exceeds the thread lead angle, so the pair cannot back out.
Cam geometry converts loosening into axial lift, so locking is independent of friction.
Must be used as a pair with cams facing each other; a single washer provides no locking.
Conical washers maintain clamp force where thermal cycling relaxes the joint.

Typical applicationsApplications

Automotive chassis and driveline
Pressure vessels and pipe flanges
Wind turbine towers and nacelles

Selection notesSelection

Always fit as a pair with cams facing each other and serrations against the part and the head; a single washer has no locking function.

Frequently asked questionsFAQ

Why must the two washers be used as a pair?

Locking comes from relative sliding on the cam faces. A single washer has no mating cam, so it behaves as a plain washer with no locking effect.

What matters during installation of the Wedge-Lock Dual-Layer Washer?

Fit the two washers as a pair with the cams facing each other. Cam angle exceeds the thread lead angle, so the pair cannot back out.

Specifications

Material	Spring Steel 65Mn
Surface Treatment	Black oxide / Zinc-plated
Standard	GB/T 94.1, ISO 16130 (transverse vibration)
Installation	fitted as a pair with cams facing
Typical substrate	wind, construction and rail structures
Key inspections	tooth height, hardness, locking performance

Manufacturing and inspection

Tooth height, cam angle and hardness are sampled to drawing.We recommend a pilot assembly at the actual torque and mating part before locking the process parameters for volume.