Fasteners

Connectors for Cross Laminated Timber (CLT) Structures

Screws

SWD

Structural Double Threaded Wood Screw

SWD is a construction screw designed to connect two timber members together. The small cap-style head and double thread creates a flexible, hidden assembly with high strength. The differentiated thread pitch creates a clamping effect, reducing the risk of gaps between the timber members.

Technical Data Sheet

CE Marking

ETA

EPD

Protec® +

Service class 2

Outdoor

Fastener Designer

SWD_SSTBP_homepage_PL_pl

SWD_SSTBP_homepage_LV_en

SWD_SSTBP_homepage_NO_no

SWD_SSTBP_homepage_DK_da

Product Details

Images

Features

CE marked to EN14592
Cap-style head
Double threaded
Chisel point

Material

Steel - Protec^®+ coating

Application

Common Applications

Timber to timber connections

Technical Data

Product dimensions

Dimensions

Reference	Fasteners Dimensions[mm]
	Item Code	Other		Product Dimensions[mm]
	Item Code	Qty per box	Stocked in UK	d[mm]	l[mm]	dh[mm]	d1[mm]	lg1[mm]	lg2[mm]	Driver Bit[mm]
SWD6.5X65	75425	50.0	Yes	6.5	65	8	4	28	21.5	T-30
SWD6.5X90	75426	50.0	Yes	6.5	90	8	4	40	33.5	T-30
SWD6.5X130	75427	50.0	Yes	6.5	130	8	4	40	33.5	T-30
SWD6.5X160	75428	50.0	Yes	6.5	160	8	4	65	58.5	T-30
SWD6.5X190	75429	50.0	Yes	6.5	190	8	4	80	73.5	T-30
SWD6.5X220	75430	50.0	Yes	6.5	220	10	4	95	88.5	T-30
SWD8.0X90	75431	50.0	Yes	7.8	90	10	5.4	40	31.5	T-40
SWD8.0X130	75432	50.0	Yes	7.8	130	10	5.4	40	31.5	T-40
SWD8.0X160	75433	50.0	Yes	7.8	160	10	5.4	65	56.5	T-40
SWD8.0X190	75434	50.0	Yes	7.8	190	10	5.4	80	71.5	T-40
SWD8.0X220	75435	50.0	Yes	7.8	220	10	5.4	95	86.5	T-40
SWD8.0X245	75436	50.0	Yes	7.8	245	10	5.4	107.5	99	T-40
SWD8.0X275	75437	50.0	Yes	7.8	275	10	5.4	107.5	99	T-40
SWD8.0X300	75438	50.0	Yes	7.8	300	10	5.4	135	126.5	T-40
SWD8.0X330	75439	50.0	Yes	7.8	330	10	5.4	135	126.5	T-40

Product characteristic properties

Reference	Screw Parameters
	Characteristic parameters
	Characteristic Yield Moment – My,ₖ[Nm]	Characteristic withdrawal parameter - fₐₓ,ₖ,₉₀°[N/mm²]	Characteristic head pull-through parameter - fₕₑₐd,ₖ[N/mm²]	Characteristic tensile capacity - fₜₑₙₛ,ₖ[kN]	Characteristic torsional strength - ftor,k[Nm]	Torsional ratio
SWD6.5X65	12.4	13.7	-	14.5	12.6	≥ 1,5
SWD6.5X90	12.4	13.7	-	14.5	12.6	≥ 1,5
SWD6.5X130	12.4	13.7	-	14.5	12.6	≥ 1,5
SWD6.5X160	12.4	13.7	-	14.5	12.6	≥ 1,5
SWD6.5X190	12.4	13.7	-	14.5	12.6	≥ 1,5
SWD6.5X220	12.4	13.7	-	14.5	12.6	≥ 1,5
SWD8.0X90	26.8	13.1	-	25.3	27.7	≥ 1,5
SWD8.0X130	26.8	13.1	-	25.3	27.7	≥ 1,5
SWD8.0X160	26.8	13.1	-	25.3	27.7	≥ 1,5
SWD8.0X190	26.8	13.1	-	25.3	27.7	≥ 1,5
SWD8.0X220	26.8	13.1	-	25.3	27.7	≥ 1,5
SWD8.0X245	26.8	13.1	-	25.3	27.7	≥ 1,5
SWD8.0X275	26.8	13.1	-	25.3	27.7	≥ 1,5
SWD8.0X300	26.8	13.1	-	25.3	27.7	≥ 1,5
SWD8.0X330	26.8	13.1	-	25.3	27.7	≥ 1,5

Certification

Declaration of Performance (DoP)

uk-dop-e21-0670-02-s-2.pdf

Show history

2022-08-26

uk-dop-e21-0670.pdf

European Technical Assessment (ETA)

eta-21-0670-2025-10-17.pdf

Show history

2021-12-09

eta210670-2021-12-09-cor-1.pdf

Environmental Product Declarations (EPD)

epd-certificate-sst-screws

CAD and BIM Library

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Product Details

Images

Features

Features

Material

Application

Common Applications

Technical Data

Product dimensions

Dimensions

Product characteristic properties

Certification

Declaration of Performance (DoP)

European Technical Assessment (ETA)

Environmental Product Declarations (EPD)

SWD8.0X160

SWD6.5X130

SWD6.5X90

SWD8.0X190

SWD6.5X220

SWD6.5X190

SWD8.0X90

SWD8.0X330

SWD6.5X160

SWD8.0X220

SWD8.0X300

SWD8.0X245

SWD8.0X130

SWD6.5X65

SWD8.0X275

SWD8.0X160

SWD6.5X130

SWD6.5X90

SWD8.0X190

SWD6.5X220

SWD6.5X190

SWD8.0X90

SWD8.0X330

SWD6.5X160

SWD8.0X220

SWD8.0X300

SWD8.0X245

SWD8.0X130

SWD6.5X65

SWD8.0X275

2D

3D/3D Simplified

About Simpson Strong-Tie®

Simpson Strong-Tie U.K.

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