Lib Pietrantoni

Lib has been with the Brinkman International Group, Inc. for the last 30 years. Currently the Director of Global Sales, Lib has held numerous positions in Engineering, Operations, Sales and Product Management with CJWinter and its manufacturing divisions. Lib is a member and has served on governing boards for the Society of Automotive Engineers, The American Society of Mechanical Engineers, and Precision Machine Products Association.

Recent Posts

Three Reasons Why Manufacturers Prefer Rolled Threads

An Introduction to Thread Rolling

Thread rolling is a cold forming or cold metal forming process that creates threads using precision thread rolling dies that are the mirror image of the thread being produced. This process is different from other processes like metal cutting, grinding, and chasing because it does not remove any metal to create the desired profile. Instead, these hardened steel thread rolls move and mold ductile metals quickly and very precisely into desired thread form.

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Speedy Delivery Matters! CJWinter Delivers Thread Rolls in 24 Hours or Less

In today’s fast-paced manufacturing environment, delivering products ahead of time is more important than ever. OEMs and other production facilities operate under increasingly tight deadlines, so ensuring that their supply chain exceeds their expectations is crucial to success.

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What is Pitch Diameter?

Taps, dies, bolts, and other helically threaded parts are defined by a number of measurement parameters. Some typical thread dimensions include pitch, depth, angle, and major and minor diameters. Among these dimensions, the pitch diameter is considered to be one of the most crucial.

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CJWinter Manufacturing Thread rolls for premier line attachments and for all manufacturers

As published in Fastener Technology International August/September 2018

CJWinter manufactures thread rolls not only for their premier line of attachments but they also make thread rolls to fit attachments for all manufacturers

If your thread rolling operation includes the use of replacement rolls CJWinter thread rolls should be your product of choice. CJWinter manufactures thread rolls not only for their premier line of attachments but they also make thread rolls to fit attachments for all manufacturers, including Fette, Davenport, Landis, Reed, Detroit, and Salvo. We can produce standard and special tooth forms. We do this in days vs. weeks,  have great customer service, our thread roll quality is comparable and in many cases better than other manufacturers, all at a very competitive price. When you require flexibility and reliability for your thread rolling, CJWinter is here to help. 80% of CJWinter thread rolls ship within 24 hours!

View the Thread Rolls for Major Manufacturers Conversion Chart for more information. If you don't see the thread rolls you need, please contact one of our Sales Engineers. CJWinter can manufacture any cylindrical roll up to 8.00 inches in diameter, we have more than a half century of leading edge technology, in house heat treating, service and quality to offer to our partners. With our new coatings and proprietary materials we can extend your die life while lowering your costs - resulting in increased profits.

CJWinter is the industry leader in thread rolling solutions for CNC, multi-spindle, Swiss and Hydromat® applications. Whether your parts are as tough as stainless steel, or as soft as brass, we are the leading U.S. supplier of thread rolling attachments, thread rolls, and specialty dies. CJWinter is also a licensed MAThread supplier - able to provide the MAThread form on any cylindrical roll we produce.

For more information visit:

Or contact

CJWinter Machine Technologies | 167 Ames Street | Rochester, NY 14611 USA | 800.288.ROLL (7655)| f: 585.429.5095 | e:

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CJWinter How To Series

CJWinter is excited to announce that we’ll be starting a new how-to video series in order to make the operation, rebuilding, setting, and/or recalibration of our attachments more accessible and easier to understand.

The first video in this ongoing series deals with taper setting adjustments on pneumatic attachments.

Features and Benefits of CJWinter’s Pneumatic Attachments

Our pneumatic thread rolling attachments offer a range of unique benefits, including:

Convenient setup and adjustments

  • Clients get out-of-box-ready attachments that are easily adjustable
  • Users can quickly adjust feed rate and eliminate downtime

Equalized rolling pressure

  • Keeps thread rolling away from collet, guaranteeing thread concentricity
  • Eliminates side pressure on spindles and other parts
  • Allows for longer length and diameter rolling

Quick adjustments of pitch diameter

  • Users can make adjustments within .0002 inch without stopping

Patented roll compensator

  • Simplifies roll timing
  • Ensures perfect roll synchronization
  • Eliminates flaking
  • Allows for roll timing adjustments in the machine without disassembling gears
Single cam for entire size range
  • Allows for significant cost savings
Quick adjustments of penetration (roll feed) rate
  • Eliminates the risk of unnecessary downtime
Chip purge line
  • Keeps the gear train free of chips, which minimizes the cost and need for replacements
Quality components
  • 100% complete interchangeability for replacement parts
  • Zero time wasted on retrofitting
Secondary threading
  • Eliminates the need for a costly new machine
  • Allows an inexpensive lathe to be used as an auxiliary thread rolling machine

How-To adjust and set taper setting on pneumatic attachments

Double Dog Point Vs. Tapered Set Screw Attachments

There are two basic types of taper setting mechanisms in our pneumatic attachments: double dog point and tapered set screw. Learn more about these two options below.

Type A — Double Dog Point is found in our 125 Series, 141/151 Series, 160/170 Series

Tools needed for this type of attachment include: surface plate, Allen wrench, adjustable indicator stand, .0001-inch resolution indicator, and riser block (2 inches x 2.5 inches x 6 inches).

To make taper setting adjustments on this pneumatic attachment, users must follow these step-by-step instructions:

  1. Remove thread rolls.
  2. Place attachment on rise block.
  3. Indicate the carbide roll pin on both sides to assess parallelism.
  4. Loosen taper adjust set screw with an Allen wrench, and move accordingly.
  5. Tighten the locking set screw to secure carbide roll pin
  6. Re-indicate, zeroing on the immobile pin side.
  7. Indicate the moving side, and document reading.
  8. Repeat steps 2 - 7 required taper is achieved.
  9. Do the same on the other arm.

Type B — Tapered Set Screw is found in our 134 Series, 162/172 Series

For this type of attachment, users require the following tools: surface plate, Allen wrench, flat-bladed screwdriver, adjustable indicator stand, .0001-inch resolution indicator, and riser block (2 inches x 2.5 inches x 6 inches).

Taper setting adjustment instructions are as follows:

  1. Remove thread rolls.
  2. Place attachment on rise block.
  3. Indicate the carbide roll pin on both sides to assess parallelism.
  4. Loosen locking set screw with an Allen wrench.
  5. Pull out carbide roll pin.
  6. Turn the taper set screw in or out one revolution.
  7. Slide the carbide roll pin back in.
  8. Tighten down the lock-in set screw.
  9. Re-indicate, zeroing on the immobile pin side.
  10. Indicate the moving side, and document reading.
  11. Repeat steps 2 - 10 until required taper is achieved.
  12. Do the same on the other arm

Learn More

CJWinter backs all of our products and services with a deep commitment to constant improvement and innovation. We’re proud to offer the following guarantees to all of our valued customers:

  • Unmatched customer service — We offer in-depth online support, engineering support, and scheduled on-site training services.
  • Superior tools — High-strength design and construction prolong tool life and allow for superior surface finish.
  • Fast delivery — We ship 80% of our thread rolls within 24 hours of client ordering.

For more detailed pneumatic attachment instructions and visuals, check out our how-to video here.

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CJWinter & Davenport at PMPA National Tech Conference 2018

CJWinter & Davenport are excited to announce that they will be attending the 2018 PMPA National Technical Conference from April 21-24 in Rosemont, IL.

We will join other technical and quality leaders from across the country to exhibit the latest technology and machining capabilities used by precision machining shops today. Visit our booths #33 and #34 during the event and speak with our industry leading experts.

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New 132EG Cross Slides Offer Added Strength, Easier Maintenance

CJWinter’s 132EG series cross slides have recently been updated to include several new features to improve serviceability, longevity and quality of the slides.

The top blocks are now smaller and position specific, making them more similar to the classic Davenport size for 1st and 2nd position. 

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CJWinter Wins PMPA’s Technical Member Participation Award

At CJWinter, we’re proud to be part of a vibrant manufacturing community — and we’re equally proud to maintain active membership in various industry associations. From the American Petroleum Institute (API) to the Business Council of New York State, Inc., we hold memberships across a range of prominent groups.

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Pitch Diameter, Major Diameter, Blank Diameter - What are They?

As mentioned in our last blog post, in order to achieve a fully optimized thread rolling process, there are two diameters that come into play: Pitch Diameter and Blank Diameter. The means by which a blank diameter is calculated will vary based on whether a straight thread or a tapered pipe thread is the end goal. In order to calculate the blank diameter for a straight thread you must first have an understanding of what the maximum and minimum pitch diameters are, as well as an understanding of the maximum and minimum of the major diameter. 

But, what’s rarely touched upon is what all of those terms mean. In this blog post, we’ll take a step back and walk through what each of these thread rolling keywords are, and explain how they interface together.

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Proper Tooling & Gauges to Thread Roll Pre-Plate Parts Efficiently for External Threads

A guide to the proper tooling and gauges required for efficiently thread rolled pre plate parts.

It is important when manufacturing component parts to take into account the correct plating requirements.  Having knowledge of the specific plating specifications as well as making allowances to the thread rolls and gages are critical in producing a functional thread. Below are some important things to consider that will ultimately allow you to run pre-plate parts efficiently.
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