Würth UAE Contact +971 50 858 2034 | Free delivery on orders above 200 AED
Concrete screw with countersunk head W-BS/S - CONCSCR-(W-BS/SK)-(A2K)-TX30-5-25-6X60 Concrete screw with countersunk head W-BS/S - CONCSCR-(W-BS/SK)-(A2K)-TX30-5-25-6X60 Concrete screw with countersunk head W-BS/S - CONCSCR-(W-BS/SK)-(A2K)-TX30-5-25-6X60 Concrete screw with countersunk head W-BS/S - CONCSCR-(W-BS/SK)-(A2K)-TX30-5-25-6X60
Concrete screw with countersunk head W-BS/S - CONCSCR-(W-BS/SK)-(A2K)-TX30-5-25-6X60 - 1
Concrete screw with countersunk head W-BS/S - CONCSCR-(W-BS/SK)-(A2K)-TX30-5-25-6X60 - 2
Concrete screw with countersunk head W-BS/S - CONCSCR-(W-BS/SK)-(A2K)-TX30-5-25-6X60 - 3
Concrete screw with countersunk head W-BS/S - CONCSCR-(W-BS/SK)-(A2K)-TX30-5-25-6X60 - 4

Concrete screw with countersunk head W-BS/S

Concrete screw W-BS steel zinc plated type SK
CONCSCR-(W-BS/SK)-(A2K)-TX30-5-25-6X60

Art.-no. 5929136025
EAN 4046777685237
All versions

Prices for customers after login

Exclusively for trade customers

Register now and access more than 125,000 products

Highest loads and efficient installation. For flush-mount installation of e.g. railings or handrails, zinc-plated steel
  • 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
Proof of Performance

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

Notice

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.

Application area

Railings

Handrails

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 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

Application area

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)

Anchor size

6 mm

Anchor length (l)

60 mm

Attachment height (t fix 1)

25 mm

Attachment height (t fix 2)

20 mm

Attachment height (t fix 3)

5 mm

Thread diameter

7.5 mm

Nominal drill-bit diameter (d 0)

6.0 mm

Drill hole depth (h 1.1)

40 mm

Drill hole depth (h 1.2)

45 mm

Drill hole depth (h 1.3)

60 mm

Embedding depth (h nom1)

35 mm

Embedding depth (h nom2)

40 mm

Embedding depth (h nom3)

55 mm

Head diameter (d sk)

13 mm

Internal drive

TX30

Head type

Countersunk head

Material

Steel

Through-hole in the component to be connected (d f)

8.0 mm

Surface

Zinc plated

Type description

W-BS type SK

Installation parameters in pre-loaded hollow ceiling panels
Anchor size [mm] 6
Minimum axis distance smin [mm] 100
Minimum edge distance cmin [mm] 100
Minimum spacing between the groups of anchors amin [mm] 100
Distance between cavities lc ≥ [mm] 100
Spacing between tensioning strands lp ≥ [mm] 100
Spacing between tensioning strands and drilled hole ap ≥ [mm] 50
Nominal drill diameter d0 [mm] 6
Through hole in the component being connected df ≤ [mm] 8
Installation parameters in concrete
Anchor size [mm] 5 6 8 10
Nominal length of thread engagement hnom [mm] 351) 351) 40 55 45 55 65 55 75 85
Minimum axis distance smin [mm] 35 35 40 40 50 50
Axis distance scr,N [mm] 81 81 93 132 105 129 156 129 180 204
Minimum edge distance cmin [mm] 35 35 40 40 50 50
Edge distance ccr,N [mm] 40,5 40,5 46,5 66 52,5 64,5 78 64,5 90 102
Minimum member thickness hmin [mm] 80 80 80 80
Nominal drill diameter d0 [mm] 5 6 8 10
Diameter of cutting edges dcut ≤ [mm] 5,40 6,40 8,45 10,45
Drill hole depth h1 ≥ [mm] 40 40 45 60 55 65 75 65 85 95
Through hole in the component being connected df ≤ [mm] 7 8 12 14
Internal drive TX25 TX30 TX40 TX50
Head diameter dsk [mm] 12 13 20 22
Max. rated torque of tangential impact screwdriver Timp,max [Nm] 110 160 300 400
1) For anchors in a redundant non-structural system
General installation parameters in masonry:
Anchor size Diameter 5 6 8 10
Nominal length of thread engagement hnom hnom1 hnom1 hnom2 hnom1 hnom2 hnom1 hnom2
[mm] 35 35 55 45 65 55 75
Nominal drill diameter d0 [mm] 5 6 8 10
Diameter of cutting edges dcut ≤ [mm] 5,4 6,4 8,45 10,45
Drill hole depth h0 ≥ [mm] 55 55 75 65 85 75 95
Through hole in the fixture df ≤ [mm] 7 8 12 14
Performance data of an individual anchor in solid and perforated block masonry according to ETA-23/0196
Anchor size Nominal length of thread engagement Admissible tensile load Admissible shear load Min. edge distance Min. spacing Distance from joints Max. torque for manual installation Max. torque for installation with drill/driver Installation using tangential impact driver
hnom Nadm Vadm cmin smin, || = smin, ⊥ cj ⊥ ≥ cj || ≥ Tinst≤ Tinst≤ Timp,max
[mm] [mm] [kN] [kN] [mm] [mm] [mm] [mm] [Nm] [Nm] [Nm]
Solid calcium silicate block KS NF in accordance with EN 771-2:2015-11
KS 20 - 2.0 - NF - 240 x 115 x 71 mm, stone raw density ρ ≥ 2.0 kg/dm3, stone compressive strength fmean = 26 N/mm2,
minimum wall thickness hmin = 240 mm
5 35 1 0,94 80 80 35 80 6 185
6 35 0,89 0,94 80 80 35 80 11 10 185
6 55 1,4 0,94 80 80 35 80 11 185
8 45 1,17 0,94 80 80 35 80 27 300
8 65 1,23 0,94 80 80 35 80 23 300
10 55 1,06 0,94 80 80 35 80 34 300
10 75 1,29 0,94 80 80 35 80 146 300
Silka XL solid calcium silicate block KS 12DF in accordance with DIN EN 771-2:2015-11
KS- R (P) - 2.0 - 12DF - 498 x 175 x 148 mm, stone raw density ρ ≥ 1.8 kg/dm3, stone compressive strength fmean = 14 N/mm2,
minimum wall thickness hmin = 175 mm
5 35 0,66 0,91 80 80 40 80 6
6 35 0,66 0,91 80 80 40 80 10 10
6 55 1,17 2,37 80 80 40 80 10 185
8 45 1,8 0,91 80 80 40 80 25 300
8 65 1,8 2,14 80 80 40 80 25 300
10 55 1,83 1,69 80 80 40 80 45 300
10 75 1,91 2,44 80 80 40 80 45 300
Hollow calcium silicate block KS L, 3DF in accordance with DIN EN 771-2:2015-11
SWKV KSL 12 - 1.6 - 3DF - 240 x 175 x 113 mm, stone raw density ρ ≥ 1.5 kg/dm3, stone compressive strength fmean = 17 N/mm2, minimum wall thickness hmin = 175 mm
5 35 0,31 0,46 58 80 35 58 6 8 100
6 35 0,31 0,46 58 80 35 58 11 10 100
6 55 0,31 0,46 58 80 35 58 11 100
8 45 0,46 0,46 58 80 35 58 27 200
8 65 0,46 0,46 58 80 35 58 27 200
10 55 0,63 0,63 58 80 35 58 37 200
10 75 0,63 0,63 58 80 35 58 46 200
Masonry brick Mz in accordance with DIN EN 771-1:2015-11
Mz 20 - 2.0 - NF - 240 x 115 x 75 mm, stone raw density ρ ≥ 2.1 kg/dm3, stone compressive strength fmean = 21 N/mm2, minimum wall thickness hmin = 240 mm
5 35 0,46 0,6 80 80 35 80 2 4
6 35 0,46 0,6 80 80 35 80 3 9
6 55 0,46 0,6 80 80 35 80 3 9
8 45 0,66 0,6 80 80 35 80 16 14
8 65 0,66 0,6 80 80 35 80 16 14
10 55 0,86 0,6 80 80 35 80 23 185
10 75 0,91 0,77 80 80 35 80 23 185
Lightweight concrete solid block Vbl in accordance with DIN EN 771-3:2015-11
Vbl 4 - 1.0 - 2DF - 240 x 115 x 113 mm, stone raw density ρ ≥ 1.5 kg/dm3, stone compressive strength fmean = 4 N/mm2, minimum wall thickness hmin = 240 mm
8 65 0,17 0,66 80 80 35 80 6 10
10 75 0,37 0,91 80 80 35 80 5 14

Notes:


For further details on compressive strength, spacing, edge distances and installation positions, please refer to ETA-23/0196
To determine the admissible load, the partial safety factor from ETA γM=2.5 was taken into account on the resistance side and a partial safety factor γF=1.4 on the impact side.
The specified values apply to an individual anchor in masonry with fvko: 0.15 [N/mm²] and σd: 0.2 [N/mm²].
For combinations of tensile and shear loads, bending torques or reduced spacing and edge distances, please see ETA-23/0196.
Documentation for block removal must also be provided.
Performance data in concrete - fixing point according to ETA-16/0043
Anchor size [mm] 6 8 10
Nominal length of thread engagement hnom [mm]
Admissible centric tension load1)
on an individual anchor without the influence of the edge distance 		Tensile zone
(cracked concrete C20/252), s ≥ 3 hef c ≥ 1.5 hef) 		Nperm. [kN] = C20/252)
Compressive zone
(non-cracked concrete C20/252),
s ≥ 3 hef c ≥ 1.5 hef)
Admissible shear load1)
on an individual anchor without the influence of the edge distance 		Tensile zone
(cracked concrete C20/252), c ≥ 10 hef) 		Vperm. [kN] = C20/252)
Compressive zone
(non-cracked concrete C20/252), c ≥ 10 hef)
Permissible bending moment Madm [Nm]
Admissible load under seismic activity performance categories C1 and C2 see European Technical Assessment ETA-16/0043 C1 x x x x x
C2 x x
Admissible load when exposed to fire (R30, R60, R90, R120), see European Technical Assessment ETA-16/0043
Performance data in hollow-core prestressed concrete ceilings according to ETA-16/0128
Anchor size [mm] 6
Mirror thickness [mm] ≥ 25 ≥ 30 ≥ 35
Anchors in a redundant non-structural system in hollow-core prestressed concrete ceilings5) Fperm. [kN]
1) The partial safety factors of the resistances yM regulated in the evaluation/approval and a partial safety factor of the effects of γF = 1.4 have been taken into account. For a combination of tensile and shear loads, for the influence of the edge distance and anchor groups please see the appropriate guidelines e.g. DIN EN 1992-4.
2) The concrete has normal reinforcement. Higher values are possible for higher concrete strengths.
3) The admissible loads were determined without axial influence and the influence of the edge distance.
4) Number of attachment points ≥ 3 and at least one anchor per attachment point produces a load per attachment point of Fperm ≤ 1.4 kN or number of attachment points ≥ 4 and at least one anchor per attachment point produces a load per attachment point of Fperm ≤ 2.1 kN. The admissible loads can be increased if the design shows that the requirements governing the strength and rigidity of the component to be attached remain satisfied even after the failure of an anchor in terms of the limit state of serviceability and load-bearing capacity.
5) The assembly data must be observed.
Performance data in concrete - anchors in a redundant non-structural system according to ETA-16/0128
Anchor size [mm] 5 6
Nominal length of thread engagement hnom [mm]
Anchors in concrete in a non-structural system based on a redundant design3) Nperm. [kN] ≥ C20/25
Admissible shear load1)
on an individual anchor without the influence of the edge distance 		Tensile zone
(cracked concrete C20/252), c ≥ 10 hef) 		Vperm. [kN] = C20/252)
Compressive zone
(non-cracked concrete C20/252), c ≥ 10 hef)
Permissible bending moment Madm [Nm]
Admissible load when exposed to fire (R30, R60, R90, R120), see European Technical Assessment ETA-16/0128

Product information

Würth Catalogue

Datasheets(X)

CAD data (available after login)

Certificates/ Documents

 | 

 | 

Art.-no.
Cust. Mat. No.

Hazardous Material

Product information

Würth Catalogue

Datasheets()

Datasheets ()

CAD data  | 

Certificates/ Documents

 | 

 | 

Technical information
Show all product details