Pepperell, MA

Recently acquired by Prince Industries, Pepperell (formerly Keystone Precision Machining) serves the Aerospace and Defense industries with excellence built upon three decades of innovation and dedication. Long-time customers rely on Prince Pepperell because they’re assured of exacting attention to detail, quality, and on-time delivery. We’re proud of the relationships we’ve built with our customers based on mutual respect, integrity, and trust.

Pepperell has grown by investing in new equipment and technology, and now has expanded capabilities and resources as part of Prince Industries. Whether short runs, high-volume production, or start-to-finish assembly, we’re ready to meet your needs. Depending on part complexity, we can turn your job around within days of your order.

Pepperell Capabilities

Rapid Prototyping

Prince Pepperell’s specialty is working closely with clients to provide design for manufacturability solutions – for cost reduction, ease of manufacturing, and reduced time to market. Before any work is begun, Pepperell will review your part design and offer recommendations to improve manufacturing processes that lower costs. Suggestions include material, plating, and tolerancing across all production machining services. Once your prototype has been finalized, Pepperell can provide manufacturing solutions including short-run and production volumes. With multiple 3D printers in-house, Pepperell can create a part in as little as one day, depending on complexity.

Production Machining

Receive your parts in four weeks or less from receipt of PO. Pepperell can meet your short-run or high-volume production requirements through our diverse array of CNC machinery and robotics. We combine a suite of multi-axis vertical and horizontal milling centers across two facilities to help you easily meet your urgent go-to-market timeline – from 1 to 10,000 pieces. Our CNC Turning Centers can support diameter turning up to 10 inches. We combine a fleet of lathes with tolerance capabilities down to .0002. Using our Sodick Wire EDM machine, our EDM specialists can produce both simple and complex parts with exceptionally tight tolerances and smooth finishes. Pepperell’s expertise includes precision drilling for fluid-filled chassis to aid in fluid flow and cooling.

Specifications 

  • Mill: Up to 50” x 26” x 30”
  • Turn: Up to 10” Diameter
  • Wire EDM: Max. 12” x 12”
  • Deep hole: 20”+ deep
  • Quantity: 1–10,000

Mechanical Assembly

Pepperell assembles complex box builds, sub-assemblies, and unique components at our state-of-the-art facility, adhering to ISO9001:2015 standards. Parts are tracked using barcoded work orders ensuring 100% traceability of materials and parts from vendors. We specialize in assembling complex parts and box assemblies, which are installed in control units for missiles, military drones, industrial machinery, and non-invasive medical devices. Because efficient production assemblies – and fast time to market – are based on part design, Keystone works with your engineering team to review designs before beginning production.

Quality Assurance

We take pride in producing and delivering a product that we would want to receive. This lends itself to multi-level inspection procedures at every step of the manufacturing and assembly process. Formal first article and AS9102 reports are produced upon request.  As part of our commitment to continuous improvement, we debrief regularly. Ideas submitted by team members for process improvements are encouraged and rewarded. The result is more than accuracy. It’s an intense focus on ensuring Pepperell delivers the highest-quality parts, know-how, and customer service that exceed your expectations.

Interested in Partnering with Prince?

Pepperell Facility Certifications

ISO 9001

ITAR

PARTNER WITH PRINCE

What Our Customers Say

“Prince has been a strategic supplier of ours for the past 20 years. Over that time, they have collaborated with our engineering team at the early stages of a number of high-profile projects to support our business growth. The Prince team is highly dedicated, with skilled professionals in every aspect of their business. Because of their performance and professionalism, they have more than tripled their business with us over the last several years.”

Global Commodity Manager – Large Industrial Energy Controls Company

“Prince has been a partner of ours for many years. I find them to be a very reliable, professional and customer-focused company. We can count on them to deliver quality products on time and at a fair market price, which is why we continue to turn to them for our machining and fabrication needs.”

Purchasing Manager – Dental Imaging Company

“Prince has been a supplier to our business for well over 20 years. They are very responsive and always willing to align with us to better support our key business objectives. Prince provides consistently good quality and delivery performance. They are very much respected and viewed as a growth supplier to our business.”

Global Sourcing Manager – Large OEM Manufacturer

“We began working with Prince in 2023, and in just one year they have drastically improved manufacturing lead times to match our aggressive schedules, reduced costs, and provided excellent quality and customer service.”

Purchasing Manager • LEO Satellite Company

“Prince is genuinely excited to collaborate on challenging projects. Their talented engineers, quality team, and project managers continue to impress us with their unrelenting dedication and enthusiasm to manufacture groundbreaking aerospace hardware.”

Purchasing Manager • Aerospace Company