BT4

Concealed joist hanger BT4

The concealed beam hangers BT4 are used for invisible connections between supported beams and supporting beams or post.

Technical Data Sheet

CE Marking

ETA

Service class 2

Fire resistance R 30

Electrogalvanized steel 20 µm

Product Details

Images

Features

Material

Steel quality:
S 250 GD + Z 275 according to DIN EN 10346

Corrosion protection:
275 g / m galvanized on both sides 20mm

Benefits

• The connection can be made up to 45 °.
• Shoes BT4 are particularly suitable for timber-to-timber connection, in which the fibers are perpendicular (e.g. columns)
• Mounting hole allows safe and comfortable hanging beam.
• In the shoe does not need additional support
• Fire protection according to DIN 4102nd

Application

Applications

Wood, wood products

Scope

• For connecting secondary beams of wood or wooden materials to the main support structure of wood / wood materials

Technical Data

Dimensions

Product Dimensions

References	Tun / DB nr.	NOB nr.	Product Dimensions [mm]					Joist Size [mm]		Header holes	Joist holes
			A	B	C	t₁	t₂	Width	Height	Ø5	Ø13
			A	B	C	t₁	t₂	Min	Min β=0	Ø5	Ø13
BT4-90	3965068	21593637	90	103	61	3	6	60	90	16	4 (Ø8.5)
BT4-120	3965076	42277124	120	103	61	3	6	60	152	20	3
BT4-160	3965084	42277143	160	103	61	3	6	60	192	28	4
BT4-200	3965092	21593660	200	103	61	3	6	60	232	36	5
BT4-240	3965100	21593678	240	103	61	3	6	60	272	44	6

HT = Main beam or support

Combined value:

\sum\frac{F_{i,d}} {R_{i,d}}\le1

For angled connections, the resistance must reckon with multiplier.

Wood/wood fastening- Characteristic values in kn

References	Product Capacities
	Number of Fasteners				Product characteristic capacities - Timber C24 [kN]
	Header		Joist		R_1,k						R_2,k
	Qty	Type	Qty	Type	Dowels length [mm]						Dowels length [mm]
	Qty	Type	Qty	Type	60	80	100	120	140	160	60	80	100	120	140	160
BT4-90	16	CNA4.0x50	4	STD8	10.8	11.8	12.9	13.7	13.7	13.7	8.1	8.9	9.7	10.3	10.3	10.3
BT4-120	20	CNA4.0x50	3	STD12	17.3	18.2	19.4	20.7	22.3	23.9	11.5	12.1	12.9	13.8	14.9	15.9
BT4-160	28	CNA4.0x50	4	STD12	28	29.5	31.2	33.3	35.7	38.2	21	22.1	23.4	25	26.8	28.6
BT4-200	36	CNA4.0x50	5	STD12	39.8	41.9	44.3	47.2	50.4	53.9	31.8	33.5	35.4	37.8	40.3	43.1
BT4-240	44	CNA4.0x50	6	STD12	52.2	54.9	57.9	61.7	65.9	70.3	43.5	45.8	48.2	51.4	54.9	58.6

The joist shall have as minimum a width = length of steel dowel.

For beams with a slope β the capacities shall be multiply with the factor.

β	0°	15°	30°	45°
factor	1.0	0.95	0.9	0.85

R_2,kcapacities are calculated as R_2,k = R_1,k x (nb of dowels - 1) / (nb of dowels).

The top dowel is not considered for the uplift capacities as it is placed in an open hole.

More detailed information are given in the ETA.

Product characteristic capacities - Timber beam to timber beam - R3.k and R4.k

References	Product Capacities
	Number of Fasteners				Product characteristic capacities - Timber C24 [kN]
	Header		Joist		R_3,k						R_4,k
	Qty	Type	Qty	Type	Dowels length [mm]
	Qty	Type	Qty	Type	60	80	100	120	140	160
BT4-90	16	CNA4.0x50	4	STD8	1.5	1.9	2.3	2.7	3.1	3.6	7.8
BT4-120	20	CNA4.0x50	3	STD12	2.2	2.9	3.5	4.2	4.8	5.6	9.8
BT4-160	28	CNA4.0x50	4	STD12	2.9	3.6	4.4	5.3	6.2	7	13.7
BT4-200	36	CNA4.0x50	5	STD12	3.5	4.4	5.4	6.4	7.4	8.4	17.6
BT4-240	44	CNA4.0x50	6	STD12	4.2	5.3	6.4	7.4	8.6	9.8	21.6

The joist shall have as minimum a width = length of steel dowel.

The capacities R₄ are for all length of steel dowel.

Product characteristic capacities - Timber beam to timber post

References	Product characteristic capacities - Timber beam to timber post - partial nailing
	Number of Fasteners				Post width	Product characteristic capacities - Timber C24 [kN]
	Header		Joist		Min	R_1,k						R_2,k
	Qty	Type	Qty	Type		Dowels length [mm]						Dowels length [mm]
	Qty	Type	Qty	Type		60	80	100	120	140	160	60	80	100	120	140	160
BT4-90	8	CNA4.0x50	4	STD8	86	9	9.9	10.9	11.6	11.6	11.6	6.8	7.4	8.2	8.7	8.7	8.7
BT4-120	12	CNA4.0x50	3	STD12	86	14.6	15.5	16.6	17.9	19.4	20.7	9.7	10.3	11.1	11.9	12.9	13.8
BT4-160	16	CNA4.0x50	4	STD12	86	22.9	24.4	26	27.9	30	32	17.2	18.3	19.5	20.9	22.5	24
BT4-200	20	CNA4.0x50	5	STD12	86	32	34.1	36.2	38.7	41.2	43.4	25.6	27.3	29	31	33	34.7
BT4-240	24	CNA4.0x50	6	STD12	86	41.6	44.3	46.8	49.7	52.3	53.2	34.7	36.9	39	41.4	43.6	44.3

The joist shall have as minimum a width = length of steel dowel.

For beams with a slope β the capacities shall be multiply with the factor.

β	0°	15°	30°	45°
factor	1.0	0.95	0.9	0.85

The capacities from this table are also valid for partial nailing beam to beam.

R_2,kcapacities are calculated as R_2,k = R_1,k x (nb of dowels - 1) / (nb of dowels).

The top dowel is not considered for the uplift capacities as it is placed in an open hole.

More detailed information are given in the ETA.

Product characteristic capacities - Timber beam to timber post - R3.k and R4.k

References	Product characteristic capacities - Timber beam to timber post - partial nailing
	Number of Fasteners				Post width	Product characteristic capacities - Timber C24 [kN]
	Header		Joist		Min	R_3,k						R_4,k
	Qty	Type	Qty	Type		Dowels length [mm]
	Qty	Type	Qty	Type		60	80	100	120	140	160
BT4-90	8	CNA4.0x50	4	STD8	86	1.5	1.9	2.3	2.7	2.7	2.7	3.9
BT4-120	12	CNA4.0x50	3	STD12	86	2.2	2.9	3.5	4.2	4.8	5.6	5.9
BT4-160	16	CNA4.0x50	4	STD12	86	2.9	3.6	4.4	5.3	6.2	7	7.8
BT4-200	20	CNA4.0x50	5	STD12	86	3.5	4.4	5.4	6.4	7.4	8.4	9.8
BT4-240	24	CNA4.0x50	6	STD12	86	4.2	5.3	6.4	7.4	8.6	9.8	11.8