Quality Is Our Priority

Our highly experienced Naval and Nuclear Products Team meticulously plans all manufacturing processes from inception to inspection, ensuring highly efficient work flow and a high quality end product.  Our team includes Prime Contractor Supplier Delegated Inspectors, exemplifying our ability to manufacture to the most demanding standards that exist in the defense industry.

Quality Precision Manufacturing

Quality Policy

Guill Tool & Engineering Co., Inc. is committed to meeting the needs of our customers and to continuously improve our processes. Requirements of ISO 9001:2015 and AS9100:2016 are communicated and maintained at all levels of the company through training, internal audits and internal communication. Each person in the company is dedicated to delivering quality products and service to our customers.

Manufacturing Expertise Is Here For You


Compliance & Certifications

  • Small Business
  • AS9100:2016 Certified by NQA
  • ISO 9001:2015 Certified by NQA
  • DFARS Compliant
  • ITAR Registered
  • NIST SP800-171 Compliant
  • JCP Certified
  • Mercury Free, REACH, RoHS Compliant Facility
  • EB-2678 Approved Level I Supplier (EB and NNS)
  • MIL-I-452028A
  • MIL-STD-45662A
  • Conflict Free Mineral Procurement

AS9100:2016 Certified by NQA

Our AS9100:2016 Certification demonstrates our commitment to quality craftsmanship and service. 

ISO 9001:2015 Certified by NQA

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.

Military Standards & Specificatons

Quality Control

Guill Tool Precision Manufacturing Inspection and Production Procedures are reviewed and inspected by major customers including:

  • General Dynamics
  • Electric Boat Division
  • Northrop Grumman Shipbuilding
  • Newport News
  • Naval Inventory Control Point
  • Mechanicsburg
  • National Quality Assurance, USA


We conducts regular audits and surveillances of existing Quality Control procedures in order to ensure total compliance with

ISO 9001, MIL-I-45208A, MIL-STD-45662A, customer established standards and other applicable MIL-SPEC & STD requirements

Inspection Equipment

Nikon MM-40
Measuring Microscope

Hexagon One CMM
Axis Capacity
X=25″, Y=36″, Z=20″

Brown & Sharp Tessa Microhite 600
Height Gauge – 24″ Height Capacity

Brown & Sharp Hite-Tronic
Height Gauge – 36″ Height Capacity

Taylor Hobson
Profilometer Surtronic 3
Surface Finish Gauge


Electronic Height Gages

Granite Surface Plates

Optical Comparators

Rockwell Hardness Testers

Responsive Service And Competitive Pricing

American Manufactured in Rhode Island

Since 1962, we have been manufacturing quality machined parts and tooling in Rhode Island. We believe in American manufacturing and are proud to be a thriving part of the manufacturing industry by adhering to the highest quality standards and supporting our local economy.

Practices, Procedures & Assets

We are proud to call attention to the following practices, procedures and assets:

  • Goal: Our goal is to manufacture affordable products while adhering to Continuous Improvement quality principles
  • Qualty Control: We employ an in-house quality control staff.
  • Cutomer Service: We possess an unrivaled Customer Service Team.
  • Certifications: We have held ISO 9001 Registered since 1995, and commonly manufacture in accordance with a variety of military standards and specifications including, but not limited to MIL-I-45208A and MIL-STD-45662A.
  • Employees: Our employees have an average of 25 years of experience.
  • Customers: We enjoy close relationships with our long-term customers, and work tirelessly to establish lasting relationships with our new clients.
  • R-TOC: We are dedicated to Reducing Total Ownership Cost (R-TOC).

Quality Precision Manufacturing

It’s not easy to find companies who offer a complete customer service package.  It’s difficult for defense component manufacturers to focus on producing a quality product, offer excellent customer service and adhere to strict military standards, all while keeping costs down for their customers. 

We at Guill have made quality, service and progressive capabilities all equal priorities in our process.

You Can Trust Us For Punctual, Reliable Deliveries