SDW

Structural Wood Screw

The Strong-Drive® SDW screw is a 8.0mm diameter, high-strength structural wood screw specifically designed for fastening multi-ply wood members together such as plated trusses, engineered timber products and solid-sawn timber. CE marked to EN14592. Driver bit included in every box.

Technical Data Sheet

CE Marking

Service class 2

Indoor

Black finish

EPD

Fastener Designer

Product Details

Images

Features

Material

Heat treated carbon steel - black E-coat™

Features

The SDW installs easily with no pre-drilling and is available in optimized lengths for fastening 2, 3 and 4-ply trusses or 45mm engineered timber such as Laminated Veneer Lumber (LVL). The SDW enables single-side fastening, while still allowing concurrent loading on both sides of the assembly to the full allowable head or point-side load of the fastener.

CE marked to EN14592
Low-profile head for reduced interference during handling or installation of hardware on the assembly
High shear values enable wider screw spacing
Bold thread design firmly clinches plies together to close gaps in multi-ply assemblies
Optimal screw lengths provide maximum point side penetration
Driver bit included in each box

Application

Common Applications

Fastening of multiple wood elements including uprights and trusses
Solid wood
Engineered timber

Warning:

Industry studies show that hardened fasteners can experience performance problems in wet or corrosive environments. Accordingly, the SDW timber screws should only be used in dry, interior and non-corrosive environments e.g. Service class 1 & 2.

Technical Data

Dimensions

Product Dimensions

References	Fastener Dimensions [mm]					Driver Bit	Weight [kg]
References	l	l_g	d₁	d	d_h	Driver Bit	Weight [kg]
SDW22258-R50E	66	36	5.6	8	19	T-40	0.018
SDW22300-R50E	76	37		8	19	T-40	0.02
SDW22338-R50E	86	40		8	19	T-40	0.021
SDW22438-R50E	111	37		8	19	T-40	0.025
SDW22458-R50E	117	37		8	19	T-40	0.028
SDW22500-R50E	127	40		8	19	T-40	0.03
SDW22600-R50E	152	37		8	19	T-40	0.034
SDW22638-R50E	162	37		8	19	T-40	0.037
SDW22634-R50E	172	40		8	19	T-40	0.038

Structural Parameters - hEN14592

References	Characteristic Yield Moment - Threaded Section - M_y,k [M_y.k] [Nm]	Characteristic withdrawal parameter - f_ax,k,90° [f_ax.k.90°] [N/mm²]	Characteristic head pull-through parameter - f_head,k [f_head.k] [N/mm²]	Characteristic tensile capacity - f_tens,k [f_tens.k] [kN]	Characteristic torsional strength - f_tor,k [f_tor.k] [Nm]	Torsional ratio
SDW22258-R50E	17.4	13.2	21.4	21.4	24.2	4.5
SDW22300-R50E	17.4	13.2	21.4	21.4	24.2	4.5
SDW22338-R50E	17.4	13.2	21.4	21.4	24.2	4.5
SDW22438-R50E	17.4	13.2	21.4	21.4	24.2	4.5
SDW22458-R50E	17.4	13.2	21.4	21.4	24.2	4.5
SDW22500-R50E	17.4	13.2	21.4	21.4	24.2	4.5
SDW22600-R50E	17.4	13.2	21.4	21.4	24.2	4.5
SDW22638-R50E	17.4	13.2	21.4	21.4	24.2	4.5
SDW22634-R50E	17.4	13.2	21.4	21.4	24.2	4.5

Connection detail for a Multiply Trimmer (UDL) - 2ply

References	Screw SWL [N]	Safe Working Loads Max UDL⁽¹⁾ [KN/m]			Screw Characteristic Load	Characteristic Loads Maximum UDL ⁽¹⁾ [kN/m]
References	SCL⁽²⁾ Long Term	1 Row @ 600 ctrs	2 Row @ 600 ctrs	3 Row @ 600 ctrs	SCL⁽²⁾ Long Term	1 Row @ 600ctrs	2 Row @ 600ctrs	3 Row @ 600ctrs
SDW22300-R50E	980	3.3	6.5	9.8	2900	9.7	19.3	29
SDW22338-R50E	1110	3.7	7.4	11.1	3110	10.4	20.7	31.1
SDW22500-R50E	1220	4.1	8.1	12.2	3810	12.7	25.4	38.1
SDW22634-R50E	1220	4.1	8.1	12.2	3810	12.7	25.4	38.1

1. Uniformly Distributed Load

2. Structural Composite Lumber

3. The load is uniformly distributed from hangers at regilar centres up to 600mm maximum

4. To calculate the maximum allowable end reaction for each hanger - multiply the UDL by the spacing e.g. 3.51x 0.6 = 2.1kN per hanger

5. To calculate the maximum span of trimmed joists use: 2 x UDL (from above table) / Floor Load (kN/m²) e.g. 2 x 3.51 / 3.12kN

Connection detail for a Multiply Trimmer (UDL) - 3ply

References	Screw SWL [N]	Safe Working Loads Maximum UDL⁽¹⁾ [kN/m]			Screw Characteristic Load [N]	Characteristic Loads Maximum UDL ⁽¹⁾
References	SCL⁽²⁾ Long Term	1 Row @ 600ctrs	2 Row @ 600ctrs	3 Row @ 600ctrs	SCL⁽²⁾ Long Term [N]	1 Row @ 600ctrs	2 Row @ 600ctrs	3 Row @ 600ctrs
SDW22438-R50E	1090	2.7	5.5	8.2	2950	7.4	14.8	22.1
SDW22500-R50E	1120	2.8	5.6	8.4	3070	7.7	15.4	23

1. Uniformly Distributed Load

2. Structural Composite Lumber

3. The load is uniformly distributed from hangers at regilar centres up to 600mm maximum

4. To calculate the maximum allowable end reaction for each hanger - multiply the UDL by the spacing e.g. 3.51x 0.6 = 2.1kN per hanger

5. To calculate the maximum span of trimmed joists use: 2 x UDL (from above table) / Floor Load (kN/m2) e.g. 2 x 3.51 / 3.12kN

Connection detail for a Multiply Trimmer (UDL) - 4ply

References	Screw SWL	Safe Working Loads Maximum UDL⁽¹⁾ [kN/m]			Screw Characteristic Load [N]	Characteristic Loads Maximum UDL ⁽¹⁾
References	SCL⁽²⁾ Long Term	1 Row @ 600ctrs	2 Row @ 600ctrs	3 Row @ 600ctrs	SCL⁽²⁾ Long Term	1 Row @ 600ctrs	2 Row @ 600ctrs	3 Row @ 600ctrs
SDW22600-R50E	1130	2.5	5	7.5	3115	6.9	13.8	20.8
SDW22634-R50E	1120	2.5	5	7.5	3070	6.8	13.6	20.5

1. Uniformly Distributed Load

2. Structural Composite Lumber

3. The load is uniformly distributed from hangers at regilar centres up to 600mm maximum

4. To calculate the maximum allowable end reaction for each hanger - multiply the UDL by the spacing e.g. 3.51x 0.6 = 2.1kN per hanger

5. To calculate the maximum span of trimmed joists use: 2 x UDL (from above table) / Floor Load (kN/m2) e.g. 2 x 3.51 / 3.12kN

Load Transfer - 2ply

References	Maximum Safe Working Load [kN]		Maximum Characteristic Load [kN]
References	4 No. Screws	6 No. Screws	4 No. Screws	6 No. Screws
SDW22300-R50E	7.8	11.8	23.2	34.8
SDW22338-R50E	8.9	13.3	24.9	37.3
SDW22500-R50E	9.8	14.6	30.5	45.7
SDW22634-R50E	9.8	14.6	30.5	45.7

For 4 & 6 screw arrangement images, see installation tab below

Load Transfer - 3ply

References	Maximum Safe Working Load [kN]		Maximum Characteristic Capacity [kN]
References	4 No. Screws	6 No. Screws	4 No. Screws	6 No. Screws
SDW22438-R50E	6.5	9.8	17.7	26.6
SDW22500-R50E	6.7	10.1	18.4	27.6

For 4 & 6 screw arrangement images, see installation tab below

Load Transfer - 4ply

References	Maximum Safe Working Load [kN]		Maximum Characteristic Load [kN]
References	4 No. Screws	6 No. Screws	4 No. Screws	6 No. Screws
SDW22600-R50E	6	9	16.6	24.92
SDW22634-R50E	6	9	16.4	24.56

For 4 & 6 screw arrangement images, see installation tab below

Installation

SDW screws install best with a low-speed drill and a T40 6-lobe bit (bit included with every box of screws).
Pre-drilling is typically not required. SDW screws may be installed through metal truss plates as approved by the truss designer
Drive the fastener so that the top of the head is slightly embedded into the top surface of the timber. To ensure correct performance, do not under or over-drive the fastener.
Individual screw locations may be adjusted up to 75mm to avoid conflicts with other hardware or to avoid timber defects.