Serrated Flange Lock Nut

A serrated flange lock nut is a one-piece metal fastener consisting of a hexagonal nut body and an integrated circular flange with serrations on its bearing face. The flange distributes the clamping load across a wider contact area, while the serrations engage with the mating surface during tightening to increase resistance to rotational movement.

Unlike nylon-insert lock nuts, this design contains no polymer locking insert. Its temperature suitability depends on the material grade, surface coating, applied load, and operating environment.

 
Serrated flange lock nuts are used in automotive components, industrial machinery, agricultural equipment, and general mechanical assemblies. Selection requires attention to thread dimensions, mechanical property class, corrosion exposure, installation torque, and mating-surface compatibility.

Automotive and Commercial Vehicles: Mounting brackets, selected chassis components, and mechanical joints where serrated contact is compatible with the joint design.

Industrial Machinery: Motor mounts, conveyor assemblies, equipment frames, and mechanical housings requiring an integrated bearing flange.

Agricultural Equipment: Selected mounting brackets, machinery guards, and equipment structures exposed to movement and vibration.

Construction Equipment: Mechanical mounting assemblies where the fastener's material, strength class, and surface interaction meet design requirements.

Electrical Equipment: Selected enclosure and component mounting points where serrations do not compromise protective coatings or electrical bonding requirements.

Application suitability depends on the joint design, loading conditions, substrate material, and applicable engineering standards. Critical structural connections require fasteners qualified for the specific application.

Thread Compatibility: Match the nut diameter, pitch, and thread system to the mating bolt. Metric and Unified threads are not interchangeable. Verify the required thread tolerance and engagement length.

Material and Strength Class: Select the material and mechanical property class according to the bolt specification, joint load, temperature, and governing standard. A2-70 and A4-80 stainless steel fasteners should be distinguished from carbon steel property classes.

Mating Surface: Serrations can penetrate coatings and leave surface marks. Evaluate substrate hardness, coating thickness, and acceptable surface damage before installation, particularly on aluminum components and finished panels.

Corrosion Resistance: Choose a coating or stainless steel grade based on the operating environment. Specify the applicable corrosion test method, exposure duration, and acceptance criteria instead of assuming a universal salt-spray rating.

Installation Torque: Determine tightening torque according to fastener dimensions, material, coating, lubrication, and joint design. Torque values should not be transferred between different configurations without engineering evaluation.

Reuse Requirements: Repeated installation can wear the serrations or damage the mating surface. Inspect the threads and bearing face after removal, and replace damaged fasteners.

For a quotation, provide the thread size and pitch, material grade, mechanical property class, surface finish, applicable standards, order quantity, and delivery destination. Include the mating bolt specification, substrate material, installation conditions, and required inspection documents.
For custom requirements, submit a dimensioned drawing or reference sample showing thread dimensions, flange geometry, serration configuration, and material requirements.

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