Knurled Pins & Knurling Services

Get the perfect fit for any application with our custom-manufactured knurled pins.


Years in Business


Sq. Ft. Facility


Manufactured Knurled Pins per Month


Satisfied Customers


ISO 9001: 2015

What Are Knurled Pins?

Knurled pins are pins with many small grooves, or serrations, around their diameter. It is often necessary for the purpose of assembly, retention or function for the knurl to be custom designed. Knurled pins typically have a greater number of serrations than grooved pins, offering superior fastening capacity. For this reason, knurled pins are often used to assemble different components, particularly hinge applications and in applications that are subject to vibration.

Knurled pins are created using a cold working process known as flat die thread rolling. Flat die thread rolling forms threads or knurls around cylindrical pieces of metal using two dies. This process offers numerous benefits over thread cutting or machining, including higher production rates, superior material utilization, and stronger threads due to work hardening. Flat die thread rolling also provides better fatigue resistance than thread cutting or machining due to compressive stresses introduced by the rolling manufacturing process.

straight knurl

Knurled Parts

All of our knurled pins are suitable for a wide variety of applications across a broad spectrum of industries, including:









Types of Knurled Pins We Manufacture


Knurled pins come in a wide variety of lengths, diameters, tolerances, and configurations. Here at W.H. Bagshaw Company, we offer straight knurls, diamond knurls, spiral knurls, and standard or metric threads. All of our knurled pins come with a standard diameter tolerance of ± .002” and a standard length tolerance of ± .010”. Our knurled pins range in diameter from .0625” to .325”, and our minimum knurl length is .1250”.

diamond knurl

Knurled Pins Specifications

  • Aluminum
  • Brass
  • High/Low Carbon Steel
  • Copper
  • 300/400 Series Stainless Steel
  • Molybdenum
  • M50
  • 4340
  • 17-4

Our standard knurl diameter tolerance is ± .002”. Our standard knurl length tolerance is ± .010”.

.0625’’ to .325’’ in diameter

Minimum knurl length of .1250”

Gold, silver, copper, zinc, nickel, and tin plating, as well as anodizing, black oxide, and other surface treatments

What Makes W.H Bagshaw So Special?

Family Owned & Operated Since 1870

The cornerstone of American manufacturing for over 150 years, our ongoing success is a testament to our commitment to quality, customer service and continuous improvement.

Strict Quality Standards

We’re ISO 9001:2015-certified, so you can rest assured that each item we produce adheres to the highest quality standards.

30+ Swiss CNC Machines

With over 30 Swiss CNC machines in our factory, there’s no precision machining job too big — whatever you need, we have the capacity for it.

Materials On-Hand

Aluminum, brass, 300/400 series stainless steel, Delrin© plastic, molybdenum and more — we offer a wide variety of materials for a wide variety of applications.

Rapid Response Times

We pride ourselves on our responsiveness — you can always expect to hear back from one of our representatives in 24 hours or less.

Made in the USA

We’re big believers in American manufacturing, which is why all of our orders are fulfilled right here in Nashua, NH.

Our Process

Our Quality Assurance Process

Here at W.H. Bagshaw, we know that the quality of our work impacts the quality of yours.

That’s why we’ve implemented a strict quality assurance process — including scheduled in-process inspections based on part requirements and first-article inspection reports (upon request) — designed to ensure that every precision-machined component we produce is of the highest caliber and made according to your specifications.

quality assurance image

For added peace of mind, we also offer a complete Production Part Approval Process (PPAP) for any component or order upon request.

Most important, our quality management system is ISO 9001:2015-certified, which demonstrates that our precision machine shop is capable of consistently delivering high-quality parts that meet our customers’ exact requirements.

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What Can W.H. Bagshaw Do for You?