Experienced Staff
Impressive Machining Capabilities
Superior Quality Results
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About Guill

We are an established government supplier and technology leader in precision CNC machining.  Our wide range of capabilities can handle a variety of manufacturing projects.

When you chose Guill Defense we will provide you with the defense components or nuclear components your company requires. We have access to an extensive network of approved suppliers.

This ensures we are able to meet the rigorous standards of complex military specifications.

Manufacturing Expertise Is Here For You

Over 55 years of Experience

Since 1962, Guill Tool has been a preferred defense supplier of Level 1/SUBSAFE, Nuclear and non-level fittings, valves, flanges, components, and assemblies for the Naval Submarine Industry.  We are currently expanding to provide these services for surface ship construction and life-cycle maintenance.  We have decades of experience in a wide array of manufacturing projects based on drawing specifications.


In addition, we maintain a robust design team. We utilize the latest 3D CAD/MCAD in conjunction with Finite Element Analysis (FEA) and Computational Fluid Dynamics (CDF) Systems. This allows us to collaborate with customers in the design of new, efficient components for custom requirements, and turn key projects.


Guill is ISO 9001:2015 Certified by the NQA. We also participate in the General Dynamics Corporation, Electric Boat Division and Northrop Grumman Shipbuilding, Newport News Supplier Delegated Inspection Programs.


Please browse our Products and Facility pages to better understand our superior manufacturing Capabilities and to view the many defense components and parts we have machined and assembled at our West Warwick, RI facility.

Call Us Today To Find Out How We Can Help You