Custom Micro-Molded Parts for the Automotive Industry

Micro-Molded Parts
Micro-Molded Parts

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At CNR Group, LLC, our reputation is built on our ability to provide custom injected molded parts that meet the most demanding accuracy requirements. In the project illustrated here, we were approached by a customer in the auto industry to produce micro-molded parts to be used for automotive transmissions. The project was to begin with prototyping in small quantities, a practice than many of our competitors are unwilling to undertake if the job is not certain to result in a high volume order. We pride ourselves on our flexibility in these types of jobs and were eager to accept the contract, providing quotes within a 48 hour turnaround.

Using Delrin acetal as our base material, we molded the prototypes on our NISSEI 50 ton electric ejection molding machine using a 1.2 oz. shot size. These were micro-molded parts with multiple sizes required, the smallest of which 20 parts weigh a total of only 1 gram.

Multiple factors made this project especially challenging; these were unconventionally sized for their application and required precision accuracy due to the part needing to be over molded with silicon. However, the quality of our equipment combined with our seasoned staff allowed us to meet all of our customers' requirements. We produced the parts within our customer's timeframe and held tightest tolerances to ±0.002". The quality of our work was ensured by full dimensional inspections performed at a level 2 production part approval process (PPAP), and was backed up by our fully ISO compliant work processes.

Our customer was impressed with our finished products, and requested orders in quantities ranging from 500 to 3 million parts. We were able to turnaround these requests in their entirety, including delivery to our client in Wisconsin, within just six weeks.

To learn more about these micro-molded parts or the equipment and processes used to fabricate them, please see the information in the following table or contact us directly.

Micro-Molded Parts Specifications

Product Name
Micro-Molded Parts
Product Description
This micro-molded part is used on automotive transmission parts.
Capabilities Applied/Processes
Injection Molding
Equipment Used to Manufacture Part
Part was molded on a Nissei 50 ton 1.2 oz shot size, TACT Controlled, fully electric injection molding machine.
Overall Part Dimensions
Multiple sizes of parts molded. Parts molded can be small as 0.05 grams.
Tightest Tolerances
Material Used
Delrin Acetal
All customs colors can be applied.
Industry for Use
In Process Testing/Inspection Performed
Dimensional Inspection Per Established Control Plan
500 to 3 Million
Additional warehousing and blanket orders available.
Delivery/Turnaround Time
3 to 4 Weeks
Rush Services Available
Delivery Location
Standards Met
ISO 9001:2000 Compliant

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