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Concrete screw with countersunk head W-BS/S
Highest loads and efficient installation. For flush-mount installation of e.g. railings or handrails, zinc-plated steel
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Variants
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- For anchorage in concrete and masonry
- Extremely flexible application thanks to up to three effective anchorage depths (size 6-10)
- Fastening can be adjusted up to two times after installation (size 6-10), for example in order to align railings or anchor plates (please refer to the installation instructions)
- Very high loads
- Very low spacing and edge distances thanks to very low expansion effect
- Very fast and easy installation and immediate load-bearing capacity
- Attractive, flush-mount installation possible
European Technical Assessment ETA-16/0043 for individual fixing point, option 1, cracked and uncracked concrete:
- Static and quasi-static action (dia. 6-10)
- Seismic action, performance category C1 (dia. 6-10) and C2 (dia. 8-10)
- Fire resistance R30, R60, R90, R120
European Technical Assessment ETA-23/0196 for anchorage in masonry
- Static and quasi-static action (dia. 5-10)
- Fire resistance R30, R60, R90, R120 (dia. 5-6)
European Technical Assessment ETA-16/0128 for anchors in a redundant non-structural system:
- Cracked and uncracked concrete, (dia. 5 and dia. 6)
- Hollow-core prestressed concrete ceilings C30/37-C50/60, (dia. 6)
- Fire resistance R30, R60, R90, R120
DIBt National technical approval/general type approval Z-21.1-2075 as bonded screw anchor for anchorage in concrete (dia. 10 ), type SK countersunk head
- Use in combination with WIT-BS injectable mortar as WIT-BS bonded screw anchor
- In reinforced and non-reinforced and cracked and uncracked concrete C20/25 to C50/60
Fire resistance rating when exposed to fire according to the standard temperature time curve in masonry (Mz, KSL, KS) and reinforced concrete, (dia. 5 and dia. 6) - expert report no 2101/173/18 - 2018
From size 8, we recommend the use of a suitable tangential impact driver for installation. The recommended maximum nominal torque must be observed. When used in masonry, the stone-specific installation data according to ETA-23/0196 must be observed.
![](https://media.wuerth.com/stmedia/wuerth/images/std.lang.all/resolutions/normal/348px/4206421.jpg)
Railings
![](https://media.wuerth.com/stmedia/wuerth/images/std.lang.all/resolutions/normal/348px/4206422.jpg)
Handrails
![](https://media.wuerth.com/stmedia/wuerth/images/std.lang.all/resolutions/normal/348px/4332957.jpg)
Adjustment - subsequent aligning possible
![](https://media.wuerth.com/stmedia/wuerth/images/std.lang.all/resolutions/category/348px/37435254.jpg)
Create the drill hole
![](https://media.wuerth.com/stmedia/wuerth/images/std.lang.all/resolutions/category/348px/12162590.jpg)
Clean the drill hole
![](https://media.wuerth.com/stmedia/wuerth/images/std.lang.all/resolutions/category/348px/12162589.jpg)
Place screw
![](https://media.wuerth.com/stmedia/wuerth/images/std.lang.all/resolutions/category/348px/12162588.jpg)
Screw in the screw
![](https://media.wuerth.com/stmedia/wuerth/images/std.lang.all/resolutions/category/348px/12162587.jpg)
Considered installed when the head is close fitting
![](https://media.wuerth.com/stmedia/wuerth/images/std.lang.all/resolutions/category/348px/12162586.jpg)
Screw out the screw max. 2x each by max. 10 mm. Underlay. Screw in
![](https://media.wuerth.com/stmedia/wuerth/images/std.lang.all/resolutions/category/348px/12162592.jpg)
Considered installed when the head is close fitting. Lining max. 10 mm. The required embedment depth must be maintained as a minimum
![](https://media.wuerth.com/stmedia/wuerth/images/std.lang.all/resolutions/category/348px/3662258.jpg)
Locate the tensioning strand
![](https://media.wuerth.com/stmedia/wuerth/images/std.lang.all/resolutions/category/348px/3662259.jpg)
Mark the tensioning strand and locate the next one
![](https://media.wuerth.com/stmedia/wuerth/images/std.lang.all/resolutions/category/348px/3662260.jpg)
Mark the tensioning strands. Specify the drilling range
![](https://media.wuerth.com/stmedia/wuerth/images/std.lang.all/resolutions/category/348px/3662261.jpg)
Create the drill hole. Observe spacing
![](https://media.wuerth.com/stmedia/wuerth/images/std.lang.all/resolutions/category/348px/3662262.jpg)
Clean the drill hole
![](https://media.wuerth.com/stmedia/wuerth/images/std.lang.all/resolutions/category/348px/3662263.jpg)
Screw in the screw
![](https://media.wuerth.com/stmedia/wuerth/images/std.lang.all/resolutions/category/348px/3662264.jpg)
Considered installed when the head is close fitting. Observe the embedment depth/mirror thickness
European Technical Assessment ETA-16/0043 for individual fixing point, option 1, cracked and uncracked concrete:
- Static and quasi-static action (dia. 6-10)
- Seismic action, performance category C1 (dia. 6-10) and C2 (dia. 8-10)
- Fire resistance R30, R60, R90, R120
European Technical Assessment ETA-23/0196 for anchorage in masonry
- Static and quasi-static action (dia. 5-10)
- Fire resistance R30, R60, R90, R120 (dia. 5-6)
European Technical Assessment ETA-16/0128 for anchors in a redundant non-structural system:
- Cracked and uncracked concrete, (dia. 5 and dia. 6)
- Hollow-core prestressed concrete ceilings C30/37-C50/60, (dia. 6)
- Fire resistance R30, R60, R90, R120
DIBt National technical approval/general type approval Z-21.1-2075 as bonded screw anchor for anchorage in concrete (dia. 10 ), type SK countersunk head
- Use in combination with WIT-BS injectable mortar as WIT-BS bonded screw anchor
- In reinforced and non-reinforced and cracked and uncracked concrete C20/25 to C50/60
Fire resistance rating when exposed to fire according to the standard temperature time curve in masonry (Mz, KSL, KS) and reinforced concrete, (dia. 5 and dia. 6) - expert report no 2101/173/18 - 2018
Anchorages in concrete, individual fixing point with approval (dia. 6-10):
In normal weight concrete C20/25 to C50/60 (cracked and uncracked concrete)
Anchors in a redundant non-structural system in concrete, with approval:
- In normal weight concrete C20/25 to C50/60 (cracked and uncracked concrete), (dia. 5 and dia. 6)
- In hollow-core prestressed concrete ceilings C30/37-C50/60, (dia. 6)
Anchorages in masonry with approval (dia. 5-10):
- In solid calcium silicate block and perforated block
- In solid block masonry brick
Specifically designed for attractive, flush-mount installation
Suitable for fastening medium to heavy loads in concrete and light to medium loads in masonry:
- Fastening of e.g. staircase railings and balcony balustrades, handrails, steel structures, wooden substructures, metal profiles etc. in in-place installation
- Fastenings subject to seismic activity in earthquake-prone areas (only concrete)
- Fastenings subject to exposure to fire
W-BS/S (galvanised steel) may only be used in dry indoor room conditions
For use in concrete < C20/25 and pressure-resistant natural stone (without approval)
Select RAL-colour code
!! NOTE: On-screen visualisation of the colour differs from real colour shade!!