Custom CNC Milling of a Ductile Iron Steering Knuckle

We manufacture a variety of automotive suspension and power train components, which requires capabilities that go far beyond most machine shops. We manufactured this critical automotive component for an auto manufacturer in Michigan.

This part was designed to be used as a steering knuckle. This component is not only responsible for a cars steering but it must also support the entire front end.

Manufactured from high strength D65-45-12 ductile iron, it featured dimensions of 10.5″ in length, 9.5″ in width, 4″ in height, and meet tolerances of ±0.0006″.

The milling processes required to manufacture this component include drilling, boring, reaming of tapered holes, as well as straddle and slot milling. After milling, the parts had a groove machined, followed by tapping, and tapered hole reaming. The finished parts were deburred and featured an e-coat and machined finish. We currently manufacture 3,200 of these components to this customer per year. To learn more about this project sees the table below or contacts us directly.

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Highlights of this Custom CNC Machining Project

Product Description

This Knuckle is used on a Car’s Suspension Assembly.

CNC Machining Capabilities Applied/Processes

CNC Milling
Ream Tapered Holes
Straddle Milling
Slot Milling

Tapered Reaming

Equipment Used to Manufacture Part

Horizontal Machining Center

Overall Part Dimensions

Length: 10.5″
Width: 9.5″
Height: 4″

Tightest Tolerances

± 0.0006″

Material Used

D65-45-12 Ductile Iron

Material Finish

e-coat and machined

In process testing/inspection performed

Inspect and Record “SC’s”
Functional Gage Checks

Industry for Use

Automotive Industry


1,600 pairs per year

Delivery Location


Standards Met

Customer Specifications, 2D CAD Drawing

Product Name

Steering Knuckle

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