Posted to News on 20th Oct 2025, 10:30
Efficient expansion anchoring with one-sided accessibility
SPREDLOC are threaded studs which Bollhoff offers in combination with the respective processing systems for expansion anchoring. The threaded studs according to property class 8.8 have been especially designed for simple and efficient installation with one-sided accessibility after the manufacture of your component.
The result is wear-free, stable threads for your high-quality lightweight structures made of aluminium, magnesium or polymers. SPREDLOC advantages include efficiency, with a pre-installed, one-piece fastener. No holding thread is required and thread creation in formed and drilled tap holes possible. Component cleanliness is assured, with no chips or burrs during installation.
SPREDLOC is suited for a wide range of lightweight materials. Easy processing is assured, thanks to a 'blind' setting method (one-sided accessibility). Established RIVKLE installation equipment is available for processing - ranging from hand tools to a fully automatic systems.
SPREDLOC is a pre-installed fastener consisting of two elements. It is spun on using the installation tool and inserted into the mounting hole. The hole can be preformed or machined with common drills as a blind or through hole.
Through the axial pulling motion of the installation tool on the stud of the fastener, the sleeve is pulled over the stud shank and at the same time expanded. In the process, the diamond knurl of the anchoring sleeve presses into the wall of the hole on the component. The longitudinal knurling on the stud head prevents the stud from rotating inside the sleeve.
A cylindrical shoulder on the threaded stud restricts the possible setting travel and increases the pull-out strength. The SPREDLOC is now anchored and locked against screwing and pull-out.
This joining solution is suited for material thicknesses and dome heights from 6 mm.
