A customer in the electronics industry contracted C&L Rivet to fabricate a delay core for one of their product lines. This unit acts as an internal time delay for stopping the flow of electricity in circuit breakers. Fabrication began with 0.0890″ diameter low carbon steel wire, which was formed and headed using our advanced 2 die 3 blow cold header. Parts were then deburred and ground to size with our specially developed tumbling process. To increase material durability and wear resistance, this part was heat treated and copper plated for enhanced conductivity and corrosion resistance. We provide copper plating in 0.000025″ – 0.00075″ thicknesses and max finish of 40 RMS.

The cold heading portion for this part called for the extremely tight tolerances of ±.0002″. Finished dimensions of the delay core were 0.4800″ – 0.5650″ long, and 0.0930″ in diameter. All manufacturing and secondary processing was completed in house at our ISO certified facility. Our products and processes are subject to rigorous quality measures, completing thorough testing and inspections throughout fabrication. This quality program includes dimensional and optical inspections, as well as Statistical Process Control (SPC).

We currently ship 500,000 delay core units per month to the customer’s locations throughout the world. For more information about this delay core project or any of our other capabilities please see the table below or contact us directly.

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Fabricated Low Carbon Steel Delay Core Project Highlights

Product Description

This delay core is used as an internal time delay for stopping electricity flow in circuit breakers

Capabilities Applied/ Processes

Tumbling – De-Burring

Copper Plating
Heat Treating

Equipment Used to Manufacture Part

2 Die 3 Blow Cold Header

Overall Part Dimensions

Ø 0.0930″ Diameter

Tightest Tolerances

± 0.0002″

Material Used

Low Carbon Steel
Diameter: 0.0089″ diameter round wire

Material Finish

Copper Plated
Thickness: 0.000025″ – 0.00075″
40 RMS Max.

In process testing/inspection performed

Dimensional Inspection, Optical Inspection
Statistical Process Control (SPC) All Critical Dimensions

Industry for Use



500,000 / Month

Delivery/ Turnaround Time

6 weeks ARO

Delivery Location


Standards Met

Customer Specifications, 2D CAD Drawing

Product Name

Delay Core

Why did you choose this project to show case?

This is a cold headed part with tight screw machine tolerances