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Bornemann Gewindetechnik
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Knuckle Threads or Round Threads

We manufacture your custom-made knuckle thread. The knuckle thread (or round thread) profile prevents prevents dirt buildup and mechanical damage. It is also more resistant to wear and tear than other threads as there are no delicate edges. We manufacture single-start and multi-start round thread lead screws and knuckle threads according to DIN 405, DIN 15403 and DIN 20400 standards (using metric and imperial measurement units), as well as completely custom made lead screws.

Knuckle Threads at Work

Round Threads

Knuckle thread screws are used in many different applications:

  • Underground mining. Where they are used as round thread lead screws in hoists.
  • As fastening threads in clutch and brake screws on trains and also in larger valves and gates.
  • As lifting and guiding lead screws in industrial engineering where equipment is faced with dirty environments. Due to the rounded edges of the thread profile the round thread lead screw is resistant to dirt and at the same time can withstand very large forces.

Technical Information on Knuckle Threads

Here are the nominal dimensions for a variety of thread profiles according to DIN 405 and a technical drawing of our knuckle threads:

Knuckle Threads »Download PDF
Threaded Spindles »Download PDF

How to Get Your Custom-made Knuckle Thread

Just give us the specifications you want – that’s really all we need! You can leave the technical conversion of your vision into an actual finished knuckle thread or round thread lead screw to us. Simply send us a technical drawing or a sketch with all the required dimensions and we will do the rest.

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