NFE 25-511 Conical Lock Washers

NFE 25-511 conical lock washer: a dished washer that stores elastic energy as it is flattened.

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

Wedge-locking washers work in pairs. The conical form is a spring in the axial direction, so when the joint settles or the bolt stretches the washer recovers and keeps preload. Compared with a split washer the load-deflection curve is flatter, which suits soft parts and joints that see large temperature swings.

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

Key featuresFeatures

Flatter load-deflection curve than a split washer.
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

Wind turbine towers and nacelles
Construction machinery structures
Rail bogies and running gear

Selection notesSelection

Choose cone height by joint stiffness: a taller cone gives more take-up on soft parts, a shallow cone avoids going solid on stiff joints.

Frequently asked questionsFAQ

How does a conical washer differ from a split washer?

A split washer relies on the offset ends and loses most of its force once flattened. A conical washer deflects as a whole, so it has a longer working stroke and more stable recovery, which matters where thermal expansion is significant.

What matters during installation of the NFE 25-511 Conical Lock Washers?

Fit the two washers as a pair with the cams facing each other. Flatter load-deflection curve than a split washer.

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.