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SFS TDBL-nonut® Fastener: Patented Design Enables BSA Compliance
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2026-03-04
UK-based SFS Group Fastening Technology's TDBL-nonut® fastener, with ETA-11/0191 approval, features a patented thread shape, under-head locking detail, and tri-lobular geometry that ensures it stays firmly secured without loosening—revolutionizing alternatives to traditional nuts and bolts. Single-sided installation is simple and backed by full testing, increasingly favored by cladding specialists to meet Building Safety Act (BSA) goals and efficient workflows.
Key design highlights include tri-lobular start to reduce operator torque load on hands and arms; full 360° thread engagement for effective bite; and impact overdrive for reliable, warrantied connections. Case-hardened thread forming enhances durability. Available in 8.6mm dia. x 16mm length, 10.6mm dia. x 23/30/50mm lengths, plus new low-profile flat-head versions, ideal for steel frames and substrates.
A recent two-storey commercial office case study demonstrates: Replacing traditional "tech screws" in curtain wall-to-steel frame fastening, TDBL-nonut® provides robust BSA Golden Thread data for performance certainty. SFS UK Marketing Head Vincent Matthews noted: "This design delivers complete technical proof from installation to verification, supporting Golden Thread and BSA requirements."
The project team praised: "SFS experts guided calculations and selection; its 'drill, drive, tighten' simplicity is reliable and time-saving, backed by excellent support." This product bolsters building safety and efficiency.
SFS TDBL-nonut®扣件
專利設計
建築安全法
ETA-11/0191
頭下鎖定結構
三瓣狀幾何設計
螺帽
螺栓
耐用性
fastener
patented design
Building Safety Act (BSA)
under-head locking detail
tri-lobular geometry
bolt
nut
durability
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