Welcome to Würth Germany For trade customers only Contact +49 7940 15-2400
Concrete screw stair bolt W-BS/A4 with connecting thread
Concrete screw stair bolt W-BS/A4 with connecting thread - 1
Concrete screw stair bolt W-BS/A4 with connecting thread - 2
Concrete screw stair bolt W-BS/A4 with connecting thread - 3

For detailed information, other images and documents, please select individual articles from the following table.

Concrete screw stair bolt W-BS/A4 with connecting thread

Highest loads and efficient installation. Ideal for mounting attachments outdoors in concrete that need to be removable, A4 stainless steel

See product details

Available in 3 versions

Show availability in Würth trade store
Exclusively for trade customers

Register now and access more than 125,000 products

Variants

  • Extremely flexible to use due to three anchoring depths

  • Very high loads

  • Smallest axial and edge clearance due to very low expansion effect

  • Very fast and simple assembly, immediately load-bearing and easy to dismantle

  • Pre-positioned, push-through or stand-off installation possible

  • Attachment can be adjusted up to two times after assembly
Proof of Performance

European Technical Assessment ETA-16/0043 for fixing point, option 1, cracked and non-cracked concrete:


  • Static and quasi-static effects (∅8 - ∅10)

  • Seismic effect, performance category C1 (∅8 - ∅10)

  • Fire resistance R30, R60, R90, R120


DIBt National technical approval/general type approval Z-21.1-2075 as bonded screw anchor for anchoring in concrete (∅10, type ST stair bolt)


  • Use in combination with injectable mortar WIT-BS as bonded screw anchor WIT-BS

  • In reinforced and non-reinforced and cracked and non-cracked concrete C20/25 to C50/60


Tensile capacity in concrete hollow body ceilings, (∅8 - ∅10) - expert report no. 21641 - 2016

Notice

From size 8, we recommend the use of a suitable tangential impact screwdriver for installation. The recommended nominal torque must be observed. When used outdoors, the drill hole can be sealed with WIT-BS injectable mortar.

Application area

Adjustment - subsequent aligning possible

Create the drill hole

Clean the drill hole

Place screw

Screw in the screw

Considered installed when the head is close fitting

Screw out the screw max. 2x each by max. 10 mm. Underlay. Screw in

Considered installed when the head is close fitting. Lining max. 10 mm. The required embedment depth must be maintained as a minimum

Locate the tensioning strand

Mark the tensioning strand and locate the next one

Mark the tensioning strands. Specify the drilling range

Create the drill hole. Observe spacing

Clean the drill hole

Screw in the screw

Considered installed when the head is close fitting. Observe the embedment depth/mirror thickness

European Technical Assessment ETA-16/0043 for fixing point, option 1, cracked and non-cracked concrete:


  • Static and quasi-static effects (∅8 - ∅10)

  • Seismic effect, performance category C1 (∅8 - ∅10)

  • Fire resistance R30, R60, R90, R120


DIBt National technical approval/general type approval Z-21.1-2075 as bonded screw anchor for anchoring in concrete (∅10, type ST stair bolt)


  • Use in combination with injectable mortar WIT-BS as bonded screw anchor WIT-BS

  • In reinforced and non-reinforced and cracked and non-cracked concrete C20/25 to C50/60


Tensile capacity in concrete hollow body ceilings, (∅8 - ∅10) - expert report no. 21641 - 2016