Concrete screw with countersunk head W-BS/S

Name: Concrete screw with countersunk head W-BS/S
Brand: Würth
SKU: 5929136045

Concrete screw W-BS steel zinc plated type SK
CONCSCR-(W-BS/SK)-(A2K)-TX30-25-45-6X80

Art.-no. 5929136045

EAN 4046777685244

All versions

Specification

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

Application

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)

Technical information

Anchor size	6 mm
Anchor length (l)	80 mm
Attachment height (t fix 1)	45 mm
Attachment height (t fix 2)	40 mm
Attachment height (t fix 3)	25 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	s_min [mm]	100
Minimum edge distance	c_min [mm]	100
Minimum spacing between the groups of anchors	a_min [mm]	100
Distance between cavities	l_c ≥ [mm]	100
Spacing between tensioning strands	l_p ≥ [mm]	100
Spacing between tensioning strands and drilled hole	a_p ≥ [mm]	50
Nominal drill diameter	d₀ [mm]	6
Through hole in the component being connected	d_f ≤ [mm]	8

Installation parameters in concrete
Anchor size [mm]		5	6			8			10
Nominal length of thread engagement	h_nom [mm]	35¹⁾	35¹⁾	40	55	45	55	65	55	75	85
Minimum axis distance	s_min [mm]	35	35	40		40	50		50
Axis distance	s_cr,N [mm]	81	81	93	132	105	129	156	129	180	204
Minimum edge distance	c_min [mm]	35	35	40		40	50		50
Edge distance	c_cr,N [mm]	40,5	40,5	46,5	66	52,5	64,5	78	64,5	90	102
Minimum member thickness	h_min [mm]	80	80			80			80
Nominal drill diameter	d₀ [mm]	5	6			8			10
Diameter of cutting edges	d_cut ≤ [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	d_f ≤ [mm]	7	8			12			14
Internal drive		TX25	TX30			TX40			TX50
Head diameter	d_sk [mm]	12	13			20			22
Max. rated torque of tangential impact screwdriver	T_imp,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		h_nom	h_nom1	h_nom1	h_nom2	h_nom1	h_nom2	h_nom1		h_nom2
		[mm]	35	35	55	45	65	55		75
Nominal drill diameter	d0	[mm]	5	6		8		10
Diameter of cutting edges	d_cut ≤	[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	d_f ≤	[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
	h_nom	N_adm	V_adm	c_min	s_{min, \|\|} = s_{min, ⊥}	c_{j ⊥} ≥	c_{j \|\|} ≥	T_inst≤	T_inst≤	T_imp,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 f_mean = 26 N/mm², minimum wall thickness h_min = 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 f_mean = 14 N/mm², minimum wall thickness h_min = 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 f_mean = 17 N/mm², minimum wall thickness h_min= 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 f_mean = 21 N/mm², minimum wall thickness h_min = 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 f_mean = 4 N/mm², minimum wall thickness h_min = 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 γ_M=2.5 was taken into account on the resistance side and a partial safety factor γ_F=1.4 on the impact side. The specified values apply to an individual anchor in masonry with f_vko: 0.15 [N/mm²] and σ_d: 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		h_nom [mm]
Admissible centric tension load¹⁾ on an individual anchor without the influence of the edge distance	Tensile zone (cracked concrete C20/25²⁾, s ≥ 3 h_ef c ≥ 1.5 h_ef)	N_perm.[kN] = C20/25²⁾
	Compressive zone (non-cracked concrete C20/25²⁾, s ≥ 3 h_ef c ≥ 1.5 h_ef)	N_perm.[kN] = C20/25²⁾
Admissible shear load¹⁾ on an individual anchor without the influence of the edge distance	Tensile zone (cracked concrete C20/25²⁾, c ≥ 10 h_ef)	V_perm. [kN] = C20/25²⁾
	Compressive zone (non-cracked concrete C20/25²⁾, c ≥ 10 h_ef)	V_perm. [kN] = C20/25²⁾
Permissible bending moment		M_adm [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⁾	F_perm.[kN]
¹⁾ The partial safety factors of the resistances y_M regulated in the evaluation/approval and a partial safety factor of the effects of γ_F = 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		h_nom [mm]
Anchors in concrete in a non-structural system based on a redundant design³⁾		N_perm. [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 h_ef)	V_perm. [kN] = C20/25²⁾
	Compressive zone (non-cracked concrete C20/25²⁾, c ≥ 10 h_ef)
Permissible bending moment		M_adm [Nm]
Admissible load when exposed to fire (R30, R60, R90, R120), see European Technical Assessment ETA-16/0128

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