Axial Thread Rolling Advantages

Advantages To Using An RSVP Thread Rolling System

Thread rolling is now recognized as the fastest and most reliable method of producing quality threads, with RSVP axial and tangential heads and rolls at the forefront of this technology.

The introduction of radial thread rolling offers a new dimension to users of this process, and means thread production can be measured in fractions of a second!

The applications for RSVP thread rolling heads are almost limitless, with models available to suit virtually every type of lathe in the industry.

Technical support

It should be noted that many of the features of thread rolling are shared by axial, tangential and radial rolling heads. Customers are advised to contact our technical department for assistance in selecting the appropriate equipment.

RSVP enjoy the advantage of a dedicated manufacturing facility that offers the customer unrivaled technical
support and know-how across a full range of thread rolling and thread cutting products. This expertise applies throughout our thread rolling program and is available to all our customers in North America.

The Benefits Of Thread Rolling

In order to select the appropriate rolling head, it is important to understand the principles of thread rolling.

The cold forming rolling process produces threads by plastic deformation of the material. This in turn imparts high strength plus excellent surface finish, combined with improved wear and corrosion resistance.

As a result, rolled threads are indispensable to safety critical applications in the aerospace, nuclear and automotive industries.

The high rates of material deformation required to roll threads have a most beneficial consequence; very short cycle times. Compare thread rolling with other widely used methods and the potential savings in time and cost are self evident. Figure 1 illustrates the time saving over single point as 7.2 seconds per thread. Multiply this by over 200,000 parts per annum to give a total time saving of 400 hours. This equates to 10 extra weeks of valuable machine time!

RSVP Tooling, Inc. - Axial Thread Rolling System - Thread Rolling Advantages Graph

Figure 1

Axial, Tangential Or Radial?

Before choosing the optimum rolling system, there are certain criteria that must be met:

a. Material - for axial rolling should have minimum
elongation of 5% and the tensile strength should not
exceed 1700 N/mm2. However, 8% elongation and 1000 N/mm2 are preferred for radial rolling.

b. pindle - should be fast enough to permit rolling speeds of 60-180 sfm when axial thread rolling and 60-90 sfm when radial rolling. The work piece must always be on the same center line as the rolling head.

c. Power - available power for rolling at high speeds is essential. Radial rolling requires additional torque to axial and tangential rolling as the process is completed in just one revolution of the rolls.


For producing long threads, or threads without run-out restriction, then RSVP axial rolling heads are the ideal selection. Axial heads feed on from the end of the part and require one revolution of the spindle for each pitch of thread to be produced. Controlled forward axial motion, either by cam or CNC feed, are recommended although manually operated lathes can also give excellent results. RSVP axial heads are self opening and normally require an external closing action to re-set them ready for the next pass. Right hand rolling heads are required for rolling right hand threads and the spindle direction must also be right hand. Left hand threads require corresponding heads and spindle rotation. For more detailed information on axial rolling, please consult the RSVP Axial Rolling System catalogue.


This system is used mainly on bar lathes for rolling short threads up to the shoulder or behind the shoulder.The tangential attachment is fitted to the machine cross slide and under controlled feed, forces the rolls tangentially over the rotating part up to its centre line. Unlike axial heads, tangential attachments can roll both right and left hand threads with spindle rotation in either direction. Only the roll design is changed.


For producing very short threads with a tight runout or when rolling close to a shoulder or into an undercut, then RSVP radial rolling heads offer the ideal solution. Due to the 3-roll action of the radial system, the component is well supported during the rolling process, even when threading the ends of long shafts. Since the rolling action is completed within one revolution of the rolls, cycle times are extremely short and in most cases, under 0.5 seconds.

Radial rolling heads are automatically re-set after each threading pass, but are normally actuated by external means when positioned over the component to be rolled.This is by means of the external trip lever on stationary heads, or an internal push rod on rotating heads.

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