Thread-rolling screws for a secure and direct screw connection
Thread-rolling screws form their own nut threads when they are screwed into precut holes. This not only saves assembly and production costs, but also creates stable and secure connections.
In contrast to thread cutting, the material structure in the counter thread is not interrupted during thread rolling, but compressed and strain hardened. The nut threads are automatically formed in cast blind holes, passages or in drilled, lasered or punched sheet metal parts. Especially suitable for materials such as steel, aluminium, brass or copper.
The "15/85" principle
The use of thread-rolling screws reduces costs of thread cutting, cleaning, inspection, tools, etc. up to approximately 85%. The remaining 15% remain for the fastener itself, i.e. the cost of the screw.
Thread-rolling in a class of its own: GEFU® SCREWS with TAPTITE 2000® thread
The special GEFU® SCREWS with TAPTITE 2000® thread are designed to combine the advantages of the earlier TAPTITE screws with a new thread form, the thread with the radius profile. The radius profile facilitates the flow of the nut material in the direction of the screw thread core. This results in an excellent mechanical connection technology and an ergonomic connection. Thanks to the TAPTITE 2000® thread, the rolling torques are reduced by up to 50 percent compared to conventional thread-rolling screws.
| Requirements for assessing the mechanical and functional properties of a thread-rolling screw are: | |
|---|---|
| Surface hardness Edge hardness (E.H.) | DIN 7500 + DIN 267-30 for the class 10.9 (ISO 20898-1) |
| Core hardness | DIN 7500 + DIN 267-30 for the class 10.9 (ISO 20898-1) |
| Minimum breaking torque | DIN 7500 + DIN 267-30 for the class 10.9 (ISO 20898-1) |
| Rolling torque | DIN 7500 + DIN 267-30 for the class 10.9 ( ISO 20898-1) |
Mechanical properties
Geometry - thread-rolling screw
The use of GEFU® TAPTITE 2000® increases the security of the bolting process and generates higher preload forces. This unique technology results in thread-rolling screws with the best mechanical and ergonomic properties.
As a rule, there are no need for additional securing elements with thread-rolling screws, since this is a backlash-free connection with a high pull-out resistance.
This significantly reduces the cost of the complete connection.
Thread-rolling screws according to DIN 7500
The thread of thread-rolling screws is designed in such a way that the formed internal thread can accommodate a screw with metric ISO thread (standard thread), tolerance 6h. The shape and the arrangement of the rolled part of the thread are determined appropriately.
The DIN 7500 is the oldest and most widely used version here and defines the thread and the technical delivery conditions. But also thread screws like TAPTITE®, DUO-TAPTITE® or TAPTITE 2000® are very popular on the market today.
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Brochure – GEFU® TAPTITE 2000®- Our other solutions for direct screw connections
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