Our Mission

To develop solutions for the manufacturing challenges of tomorrow, today.

Our Vision

To be a leader in the provision of high quality, value-driven machining services.

Our Values

At K4 Machining, we operate on principles that not only define the company we are today, but that also influence the company we strive to become in the future.


At K4 Machining, delivering quality products and services is our top priority. Our robust quality management system is designed such that we are able to consistently meet specifications and exceed expectations.


Honesty and integrity are among our guiding principles. We strive to develop authentic relationships with our customers, suppliers, and employees by consistently honoring our commitments and instilling a culture of ethical conduct within our organization.


Our multigenerational team is comprised of highly skilled individuals with diverse technical skills and perspectives. These unique competencies allow us to discover, develop, and implement efficient manufacturing strategies that allow us to derive value for our customers.

   Customer Focus

At the core of K4 Machining lies our commitment to providing excellence to our valued customers. By fostering strong relationships with each of our clients and creating customized solutions to meet their individual needs, we set ourselves apart from other machine shops of our kind.


We pride ourselves on remaining at the forefront of technological advancements and improvements within the manufacturing industry. Our skilled team is dedicated to continually improving the processes we employ in order to maintain optimal levels of operational efficiency that translate to value for our customers.

Our Commitment to Quality

We are fully committed to providing our customers with high quality products that comply with their specifications the first time, every time. We are currently ISO 9001:2015 compliant and are on the path towards certification.

Our quality policy encapsulates a commitment to excellence coupled with a drive for continuous improvement. It incorporates the following principles:

Fostering a company-wide mindset of quality as a top priority

Utilizing best practices in manufacturing to minimize product defects and meet and exceed customers’ expectations

Promoting participation in and understanding of quality management activities across multiple company functions

Adopting an iterative quality management system review process such that the system is continually refined and improved



Our History

Armed with decades of experience and a drive to bring excellence to the manufacturing industry, Anna and Lou Leszczynski, along with their children, founded K4 Machining in 2018. Since its inception, K4 Machining has carved a niche for itself in the ultra-precision machining market, and now proudly serves the medical, electronics, automotive, architectural, semiconductor, defense, and commercial industries. Over the course of the last few years, K4 Machining has also made strides in modernizing its operations, as evidenced by numerous equipment acquisitions and large-scale renovation projects. As a women-owned/family-operated business, traditional family values shape the ways in which we conduct business. The future of manufacturing is filled with promise, and we remain committed to fulfilling our promise of excellence in all that we do.

Our Leadership Team

203.437.8764 | 217 Interstate Lane, Waterbury, CT 06705 | [email protected]