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Serving the Defense & Commercial Industries Since 1962

We are a defense contractor committed to providing high quality precision machining services at an economical cost. We have manufactured flanges, valves, fittings, and various critical components for the defense and commercial industries for over 55 years. Guill Tool adheres to the strict criterion of ISO 9001:2015, military standards and specifications.

Precision Manufacturing Expertise Is Here For You


Why Choose Guill Tool For Your Precision CNC Machining


We have been an AS9100 facility since 1995. ISO 9001:2015 guides our work processes at every level. We are dedicated to continuous quality improvement.

ISO 9001:2015

We have been an ISO 9001 facility since 1995. ISO 9001:2015 guides our work processes at every level. We are dedicated to continuous quality improvement.

Quality Materials

Ask us about our Nuclear Plant Material Special Emphasis Program (Level 1/Subsafe).

Made in the USA

Our products are manufactured in the USA using lean principles, and the highest quality with SO 9001:2015 standards.

Efficient Precision Machining
Helping You Reduce Your Total Cost

Extensive Library

An extensive specification library provides cross-reference between National Stock Numbers, and those of the leading nuclear submarine builders.

Unparalleled Customer Service

We excel in building and sustaining long-term relationships. Our extensive supplier chain can meet material control requirements for Level 1/SUBSAFE, Nuclear Plant Material and Oxygen Clean.

Cost Effective

We are dedicated to helping the defense industry reduce total ownership cost.

Wide Range of Capabilities

Our 5-axis CNC Machine Center is capable of machining a 27.6” diameter at a 28.7” length while our EDM Hole Starter can drill a 0.008” hole, and our EDMS can machine to a tolerance of 0.0002”. For a full listing of our machinery please visit our Facilities page.

In-House Quality Control

We have decades of experience manufacturing. All of our products are held to the most stringent quality control standards in the defense industry.

Our Engineering Staff

Our skilled engineers provide on-site component design and flow analysis. Guill Tool employs personnel who have been designated Supplier Delegated Inspectors by the General Dynamics Corporation, Electric Boat Division, and Northrop Grumman Shipbuilding, Newport News.


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

CAGE Code: 29030

DUNS Number: 00-119-8233

Serving the Defense and Commercial Industries

High Energy Fluid Systems

• Steam

• Seawater

• Pure Water

• Reactor Coolant

• Hydraulics

High Pressure Gases

• Air

• Oxygen

• Nitrogen

Experience, Excellence, Engagement