BSR (Self-Anchoring Expansion Bolt)

BSR (self-anchoring expansion bolts) per GOST 28778-90 are used in construction to attach structural components, pipelines, equipment and other elements to concrete, reinforced concrete and brick structures of buildings and facilities. Thanks to their simple installation and reliable connection, these fasteners have become widely used.

BSR is a special type of fastener for installing critical connections subject to high loads. The assembly includes a bolt, a flat washer, a nut and a wedging element. All parts are made of steel with a property class of 4.6 or higher.

The bolt is installed into a pre-drilled hole of the required diameter. As the nut is turned, the expansion element increases in diameter and secures the fastener in the base material. After installation, only the bolt shank with the nut remains on the surface, to which various components can be attached. The expansion effect ensures resistance to external forces — the bolt reliably withstands pull-out loads.

GOST 28778-90 establishes a size range from M6×65 to M24×300 mm. The fastener is designed for installation in concrete structures with a strength of at least M150 and is not intended for installation in cellular or hollow materials. This is a solution for assembling load-bearing connections in dense materials; high strength and corrosion protection ensure long-term service life.

Technical description of BSR (self-anchoring expansion bolt)

BSR M6×65

M8×85

M10×100

M12×110

M16×150

M20×200