Page 527 - Wurth Total Catalogue

thread rolling screws - information

GEFU-1 Screw
Thread Rolling Screw to DIN 7500.

The optimal screw connection in steel,
diecast, aluminium, brass and copper,
at minimum assembly costs.
• The Thread Rolling screw cuts its own thread
during assembly in pre-drilled holes, without
shavings and tolerance.
• No costs for thread cutting, cleaning, rejects,
jigs, tools and machinery.
• Suitable for metal on metal and wood on metal.

The triangular cross section over the
entire length of the shaft and conical
tapered thread ends provide the
following advantages compared to
conventional screws.
• No thread cutting.
Normal Screws • No shavings.
Large amount of thread play, resulting in loss of pre-stress force (1,2). The thread-cutting process • Cost reduction.
interrupts the fibre orientation in the thread (3), resulting in reduced retaining force. Owing to shavings, • Easy insertion.
a deep blind hole is required. • Low torque.
• Cuts standard metric threads.
• No locking required.
• High resistance to vibrations.
• High reversing torque.
• High failure moment.
• High stripping force.

Conventional Thread - Cutting Screws
The metal fibres are cut (1) during the screw-in procedure, blind holes must be drilled deeper to
accomodate resulting shavings.

Thread Rolling Screws
AUS. pub. 09/12 © No deep blind hole required, since no shavings are accumulating during thread cutting.
High stripping forces cold forming of the thread (1), no thread play (2), thus no loss of pre-stress force.

06 3701