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Harbor Island Machine Works, Inc.

3431 11th Avenue S.W., Seattle, WA 98134
Telephone: (206) 682-7637 • Fax (206) 623-6011


Established in 1950
, Harbor Island Machine Works has maintained top standards and a commitment to state of the art procedures, on-time delivery, and extremely close-tolerance machining.

From a solid beginning in tool making and machine repair, we have grown in capability and expertise to include production as well as one-off machining. Today, our machine tool inventory includes more than 45 CNC, NC, and conventional machining centers.

At Harbor Island Machine, we understand the rigorous nature of job shop machining and eagerly accept the challenges of complex, premium quality manufacturing. We machine a variety of materials to exacting standards. Our work has included precision machining of sophisticated castings, complex tunnel boring heads, high-end oil tool parts, highly technical multiple-lead threads, ultra-precision set-up tooling, and diamond-making equipment.

We have established a superior reputation for on-time, within budget performance while generating a large variety of production and prototype parts weighing as much as 40 tons.

It is our hope that you will contact us when your need for precision, size and sophistication go beyond the capabilities of traditional vendors. In our area of specialization we will return the greatest value for the dollar spent. Our goal is to provide consistent, top quality machining services, on time. We aim to establish long-standing, mutually beneficial relationships with our customers.

We invite you to visit our facility and meet our team of experts!

  • Three generations of commitment and dedication to excellence
  • Measuring success by friendships made and confidence gained
  • Offering reliability and true value
  • Emphasizing flexibility while maintaining state-of-the-art facilities
  • Taking pride in our work and fulfillment of responsibilities

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