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Rolled Threads vs Cut Threads

Rolled Threads vs Cut Threads 


Rolling threads and cutting threads are the two primary manufacturing methods for creating threaded products. 


TOPTI64 bolts are roll threaded as opposed to cut thread. Rolled thread offers distinctive advantages over cut thread due to it’s inherent production process. The granular flow of the major diameter (tip) & minor diameter (root) are re-formed in unbroken continues lines during a compressed rolling process. This continues compressed granular line resist stripping because shear failures would need to take place across all line rather than a single grain. This is particularly evident in the root section of the thread where compress granular lines increases hardness up to 30%.


Thread rolling process redistributes excess material in a compact granular formation outwards giving it maximum efficiency over active stress area.

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Cut thread process removes material from original rod making a reduced core active stress area.



The active stress area are also maximized by compressed redistribution of the material, as opposed to material lost. Accuracy on pitch angle, diameter, thread angle, and surface smoothness are also much better achieved by the compression rollings process as opposed to a cut thread which will be dependent on the machine operator. Equally as important is the ability for a machine operator to maintain consistency over long period of machining.


Granular lines are not broken but enhanced in the tip section (major diameter) and  root section (minor diameter) of a rolled thread process, making  a rolled thread resistance to fatigue before tensile stress can be formed. (see fig below)


Granular lines of a cut thread are completely cut through leaving the threaded roots (minor diameter) exposed as high stress points for tensile stress buildup. (see fig below)

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