THREAD FORMS
Worm Threads
Our thread rolling offerings are built on a foundation that includes custom-engineered or standard worms designed for gearing, valve, or power transmission applications. Pitch diameters range from .0625″ thru 4″ with diametrical pitch (DP) capabilities from 5 DP thru 64 DP. Pressure angles include 14.5, 20, and 25 degrees.

All worm forms can be rolled with right- or left-handed threads and/or multiple starts. Rolled Threads Unlimited can provide worms in 12-foot lengths or machined to your blueprint specifications. More than 200 sets of worm and DP thread rolling dies are available at Rolled Threads Unlimited, catering to in-feed and thru-feed applications with an extensive array of thread pitches and finish diameters.
Specifications
Materials

SPOTLIGHT
Worm Threads
Pictured is an 8 DP Worm thread fastener, machined from a full threaded rod and heat treated to Rc 26-30. This piece is used in the gear box assembly for a piece of heavy duty agricultural equipment.