The Fundamentals of Thread Rolling

A highly versatile cold forming process, thread rolling can be done on any type of ductile metal to harden, strengthen, or change the material’s physical properties in other ways.

Thread rolling makes use of hardened steel cylindrical dies to shape materials; the dies, imprinted with the thread profile, penetrate the work metal at ultra-high pressures in order to displace and mold it into a mirror-image thread. Unlike traditional cutting and grinding methods, no metal is lost or cut away during the thread rolling process; it is simply reshaped.

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New CNC Machines and Thread Grinding Capability At CJWinter

CJWinter is proud to announce the installation of several new seven-axis computer numerical controlled (CNC) grinding machines in our facility.  

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Live From PMTS 2017: Metalforming Solutions from CJWinter

CJWinter releases new content on metalforming solutions for all major machine types. 

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PMTS 2017: Get First Look at New CJWinter and Davenport Tools

Thread rolling and screw machine experts CJWinter and Davenport Machine Tool Company will once again showcase at this year’s Precision Machining Technology Show (PMTS 2017). 

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Eco Brass: Thread Rolling for Lead-Free Alloy Now Available

Thread rolling hard materials isn’t always impossible.

Because hardened metals don’t flow easily to fill die threads, they often require a thread cutting process to manufacture.

There’s also the risk of breakage — some materials, especially aerospace metals, are simply too brittle to be thread rolled.

Typically, 150 kilopounds per square inch is the cutoff for thread rolling. These materials are just too strong. However, new alloys are changing the way thread rolling works.

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Avoid Flaking and Damage When Thread Rolling Thin-Walled Parts

When thread rolling screws and fasteners, it’s important to maintain minimum wall thickness.

This can be a challenging task, particularly when designing and manufacturing thin-walled parts, including bolts and screws, that require thread rolling.

If your design includes walls that are thin, thread rolling parts can become problematic during production, as distortion can occur. Distortion not only causes flaking and non-uniform thread geometry on a completed part, but it can also lead to the tearing or collapse of a part’s threaded portion during the thread rolling process.

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How to Calculate Thread Rolling Penetration Rate on CJWinter Pneumatic Attachments

Over the course of our 60 years of providing thread rolling solutions CJWinter has fielded a number of questions about the process — including dies, attachments, and other related tooling.

One of the most common questions we receive is: “How should I calculate thread rolling penetration rate?”

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Engineering Bulletin: How to Keep Attachments Running Efficiently

Protecting your assembly from moisture and debris is critical to avoid leaks and contamination.

Over CJWinter’s 60 years of experience in the industry, we’ve identified a number of ways to keep thread rolling attachments running efficiently. Let’s look at an airline assembly as an example.

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Enjoy Easier Thread Roll Ordering on CJWinter’s New Online Catalog

CJWinter’s premium selection of thread rolling products is now easier to access than ever before.

We are excited to announce the launch of our new online product catalog, filled with features that simplify the procurement of thread rolling tools and replacements for virtually any industry.

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Engineering Bulletin: Thread Gaging

All threaded fasteners, fittings and connectors must be measured using accurate gaging methods to ensure the highest quality.

Blank specifications vary on straight threads and tapered pipe threads. When rolling a straight thread, machine the part's blank diameter to the maximum pitch diameter - .002 inch. Roll the thread until the pitch diameter is within specification — between the pitch diameter's maximum and minimum — and adjust the blank diameter until the major diameter is within specification — between the major diameter's maximum and minimum.

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