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Company Profile

Since 1962, we have been supplying quality machined components and assemblies to the United States Navy and other Commercial Enterprises. Our products include Subsafe/Level 1, Nuclear Plant Material and Non-level fittings, valves, components and assemblies for U.S. Submarines, Aircraft Carriers and other surface combatants.

Manufacturing Expertise Is Here For You



Our team is committed to producing quality manufacturing solutions for our nations defense.


With more than 50 years of experience, we are recognized as a technology leader in machining components for the navy, defense, and commercial industries.


Our extensive network of vetted suppliers enables us to provide turn-key assemblies and manufacturing projects at an affordable cost.


Customer satisfaction and customer success are our most important concern as products proceed through manufacturing, testing, and inspection.

Quality & Service

Company Data

  • CAGE Code: 29030
  • DUNS Number: 00-119-8233
  • Business Size: Small Business
  • Accepts Credit Cards: Yes
  • SAM Registration: Active


  • AS9100:2016 Certified by NQA
  • ISO 9001:2015 Certified by NQA
  • JCP Certified
  • EB-2678
  • MIL-1452028A
  • MIL-STD-45662A
  • ITAR Registered
  • NIST SP800-171 Compliant


NAICS Codes:

332710 – Machine Shops
332721 – Precision Turned Products
332911 – Industrial Valves
332912 – Fluid Power Valve and Hose Fittings
332919 – Other Metal Valve and Pipe Fittings
333514 – Special Die & Tool Sets


SIC Codes:

3599 – Machine Shops
3451 – Screw Machine Products
3491 – Industrial Valves
3492 – Fluid Valves and Hose Fittings
3494 – Valves and Pipe Fittings
3544 – Special Die and Tool Sets

FSC Codes:

4730 – Hose, Pipe, Tube, Lubrication and Railings Fittings
4810 – Valves, Powered
4820 – Valves, Non-Powered

Experience, Excellence, Engagement

Full Service Manufacturing

  • CNC Milling, Turning to 27″ diameter
  • Grinding, Wire & Ram EDM to .0002″
  • On-Site Assembly

Core Services

  • High Precision Machining
  • Machine Super Alloy/Exotic Materials to Close Tolerances
  • Short to Medium Length Runs
  • Full Wire EDM Capabilities With a .008 Hole Popper
  • 5-Axis Machining Centers

Drawing List

Our extensive library of US Naval Submarine parts covers over 55 years of multiple class submarines starting in 1962. If there is a hard to find part that you are looking for we may be able to help you.

Other Services

  • Level 1/Subsafe Processes in Place for Years
  • Full Traceability Procedures
  • Multiple 4-Axis Machining Centers up to 36″
  • Multiple CNC Lathes up to 26″ Dia.
  • Turn-key Manufacturing Projects Using Qualified Vendors for Outside Devices When Needed

Download Our Capabilites Sheet


  • AS9100:2016 & ISO 9001:2015 Certified by NQA
  • Competitive Pricing
  • In-House Engineering
  • In-House Inspection
  • Mature, Skilled, Stable Workforce with Long Retention
  • Multiple Shift Operators for Additional Capacity
  • Over 55 Years of Experience in the Defense Industry
  • Responsive Service
  • Short Run and Single Piece Quantities

Past Performance

General Dynamics

(Electric Boat Division)

We have been an Electric Boat supplier for over 50 years, machining non-level and Level One/SubSafe components for the US Submarine Fleet. We are also a SDI (Supplier Delegated Inspector) for Electric Boat.


(Newport News Division)

We have been supplying parts to Newport News for approximately 40 years and we are a SDI (Supplier Delegated Inspector) for them as well. We provide similar high quality parts often times requiring full traceability and made from super alloys/exotic metals that we supply to Electric Boat. They are both submarine manufacturers.


NAVSUP Weapons System Support

(Mechanicsburg, PA)

As a direct Prime Contractor for the Navy, we machine a wide range of Level 1 and Non-Level parts that become spare parts for the existing Submarine fleet.

Military Standards & Specifications


American Manufacturing Since 1962

Our Rhode Island manufacturing facility operates under the quality standards required by government contracts. Our products are manufactured in the USA using lean principles, and the highest quality in a facility that is ISO 9001:2015 Certified by NQA.


Our AS9100:2016 Certification demonstrates our commitment to quality craftsmanship and service. In addition to ISO Certification we adhere to the additional quality system requirements of the Aerospace industry.

ISO 9001:2015

Guill is ISO 9001:2015 Certified by NQA. We have carried ISO 9001 Registration since 1995. The ISO 9001 Registration guides the work processes at every level.

Our quality system conforms to Mil-I-45208A and MIL-STD-45662. Our company is dedicated to a Continuous Quality Improvement Process.

Find Out How We Can Help You