About Duffin Manufacturing Company

Duffin is a highly reliable and flexible machining company for precision turned parts, coatings and assemblies. We work with a variety of businesses and industries to manufacture all of their fittings and components, from low to high volume requests. We are backed by the extensive resources and financial stability of our parent company, Chicago Faucet.

Numbers that tell a story…

Duffin is an ISO 9001:2008 and ISO 14001:2004 and OHSAS 18001:2007 certified partner for all of your critical machining services, including precision screw machining and CNC machining capabilities.

50 Years

We have been in business since 1956 providing high-quality turned parts, from simple assemblies to complex, tight-tolerance components. Our experts manufacture any part needed to run your business.

50 Machines

We operate 50 industry-leading screw machines and CNC lathe turning units to manufacture high-value components for a variety of industries. Our highly flexible machining capabilities ensure that you receive the services required for precision, custom parts.


We operate a 50,000 square-foot facility in Elyria, Ohio that delivers components locally, to Canada and all of the Eastern U.S. Our stocking program guarantees that your parts are available any time.

50 – 500,000

We produce any volume request to fulfill your turned part needs. Whether you require 50 parts to several million, we easily accommodate both small and large production runs at our state-of-the-art machining center.

Quality Care and Service

precision partsDuffin’s wide range of applications spans across many industries. Our skilled workmanship creates high-value, precision parts with consistency. If customers need complex parts, our engineering support helps with customized solutions to complete even the toughest specifications. We also offer many secondary machining services such as grinding, stamping, drilling, and tapping and post-machining processes such as heat-treating, and surface coatings.

Our focused customer base ensures quick, responsive service. We work closely with each individual and business to fully understand every detail for their turned part needs.

Duffin’s manufacturing process is optimized to reduce unnecessary costs for the customer and provide the most economical, high-quality production solution. We add the finishing touches to projects with any assembly and product testing needed.

Rely on our manufacturing and assembly expertise for your next project. Request a quote to get started.

Product SamplesVIEW MORE

Custom Nut Steel Chrome plate Screw Machine High/Low Vol. - 1
Custom Parts Secondary Operation Brass Assembly Low Vol. - 2
Hose Connector Brass Screw Machine Chrome Plating High/Low Vol. Pipe Thread - 5
Gas Fitting Steel Zinc Plate Screw Machine -3
Faucet Fitting Brass Secondary Operation Complex Part Screw Machine - 1
Plumbing Stem Brass Chrome Plate ACME Thread Screw Machine Hight/Low Volume -1
Value Cartridge Low Lead Brass Assembly Screw Machine ACME Thread - 3
Gas Fitting Steel Zinc Plate Screw Machine -1
Solder Fitting Copper Any Vol. Screw Machine Pipe Adapters Male - 1
Custom Bolt Brass Screw Machine High/Low Vol. Small Parts - 3
Water Fitting Stainless Steel Pipe Thread AWWA Thread Screw Machine High/Low Vol. - 1
Custom OEM Parts Secondary Operation Brass - 2