Since our inception in 1920, Chicago Rivet & Machine Co. has a reputation for high-quality cold formed parts. Fasteners are our specialty which led one of our long-term clients to approach us about mass-producing a hex-head bushing. The customer needed to adhere to a short and strict timeline, which included customer approval and UL listing certification.

The hex-head bushings were created in both aluminum and brass, and fabricated using a double backward extrusion process. We used a hex-head die followed by a secondary drill and tap process, all within precise tolerances of ±0.005 inches. Our team was able to deliver the annual order of 2.5 million parts in less than 10 weeks. The customer was incredibly pleased with our ability to meet their strict timing and tolerance needs. In addition to the tight tolerances, short timelines, and fast UL compliance, we were able to reduce costs for the client compared to their previous screw machining vendor.

Hex-head Bushing

Project Name & Description

Hex-head Bushing

Capabilities Applied/Processes

Double backward extrusion, hex-head die; secondary drill/tap

Equipment Used to Manufacture Part

2-die, 3-blow header

Overall Part Dimensions

<1” length; .20” main tenon diameter; .15” and .60” hole extrusions

Tightest Tolerances


Material Used

Parts offered in aluminum and brass

Material Finish


Industry for Use

General industrial


Medium-high (2.5 million/year)

Delivery/Turnaround Time

8 – 10 weeks

Delivery Location


Standards Met

Underwriters Laboratory