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.

An incorrectly sized blank diameter can result in thread rolling issues like tapered threads, slivers and flakes, and off-size threads.

Blank design, therefore, is an important consideration in the thread rolling process to ensure parts are manufactured to the highest quality.

Working in the thread rolling industry for over 60 years, CJWinter has seen its fair share of thread rolling problems of all types.  

Blank diameter, material type, and rate of penetration all play major roles in the performance of your thread rolling solution. Over the years, we identified the most common thread rolling issues and developed a series of solutions to address any challenge.

Of all the thread rolling problems we see on a regular basis, the following five represent the most common issues — and our recommended solutions to address them.  

1. Slivers / Flakes