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SDWS27 TIMBER SS Screw

Model: SDWS27

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The Strong-Drive^® SDWS Timber SS Screw is a 7mm-diameter, Type 316 stainless steel, heavy-duty structural fastener suitable for marine and coastal applications where severe-corrosion resistance is a necessity. The SDWS Timber SS screw has a SawTooth^™ point and flat washer head that make it the ideal choice for use in applications such as docks, wharfs, piers, boardwalks and ledgers where strength and severe-corrosion resistance are critical.

Designed to provide an easy-to-install, low-torque driving, high-strength, severe-corrosion resistant alternatives to through bolting, traditional lags, spikes and coach screws. The Strong-Drive SDWS Timber SS screw is a premium solution for heavy-duty structural applications. Type 316 stainless steel provides severe-corrosion resistance, making it suitable for exterior and preservative-treated timber applications.

US Patent 9,523,383

Material & Finish

316 Stainless Steel

Features & Benefits

Designed for securely fastening heavy timber fixing
Fast installation — no predrilling, no counterboring, no heavy-duty equipment needed
High withdrawal resistance
SawTooth^™ point design for fast starts and less driving torque — no need to drill pilot hole
Ideal for fastening any material into timber where there is no access to the rear
7mm shank diameter for heavy-duty structural applications
Large 16.5mm diameter flat washer head with nibs provides load-bearing area and seats flush with surface
Large, deep T50, 6-lobe recess for secure driving
Mid-shaft knurl aids in torque reduction
Made from 316 Stainless Steel for extreme corrosive environment
Load data available for all your applications
These heavy-duty timber screws are available in 6 different lengths
US Patent: 9,523,383

Applications

Outdoor Structures
Deck Structures, Ledgers, Stringers, Boundary Joists, Rim Boards
Landscaping, Retaining Wall
Deck, Carport, Shed, Pergola, Patio applications
Dock, Pier, Boardwalk applications
Jetty, Wharf and Marina construction
Ideal replacement for Spikes, Lag Bolts, Lag Screws, Coach Screws

Decking Calculator

Model No. Table

Technical Data - SDWS27 SS

Table 1. Strong-Drive^® SDWS Timber SS Screw Specifications

Model	Head Marking (##)	Screw Length (mm)	Thread Length^1,2 (mm)	Diameter (mm)			Fastener Strength
Model	Head Marking (##)	Screw Length (mm)	Thread Length^1,2 (mm)	Shank	Major	Minor	Bending Yield Moment³ (N.mm)	Tension (kN)	Shear (kN)
SDWS27300SS-RC10	3	76	51	7	10	6	25900	10.3	9.2
SDWS27400SS-RC10	4	102	76
SDWS27500SS-RC10	5	127
SDWS27600SS-RC10	6	152
SDWS27800SS-RC10	8	203
SDWS271000SS-RC10	10	254

Fastener length is measured from the underside of the head to the point.
Length of thread includes the point.
Bending yield moment calculated from characteristic tensile strength and based on minor thread diameter.
Tension and shear properties are based on 0.5 of the average load for screws tested in tension and shear, respectively. Shear strength is shear through the threads.

Table 2. Characteristic Capacity (Qk) for Strong-Drive^® Single SDWS TIMBER SS Screws Laterally Loaded or Loaded in Withdrawal from Side Grain – Seasoned Timber for Structural Grades JD4/SG8 (upper) and JD5/SG6 (lower)

Model	Screw Length (mm)	Timber Joint Group	Characteristic Shear Loads (N)									Characteristic Withdrawal Capacity (N/mm)⁶
			Timber Side Member Thickness									Face Grain	End Grain
			35	45	63	70	90	100	115	150	200	Face Grain	End Grain
SDWS27300SS-RC10	76	JD4/SG8	4535	—	—	—	—	—	—	—	—	143	85.8
SDWS27300SS-RC10	76	JD5/SG6	4320	—	—	—	—	—	—	—	—	123	73.8
SDWS27400SS-RC10	102	JD4/SG8	7475	6320	4510	—	—	—	—	—	—	143	85.8
SDWS27400SS-RC10	102	JD5/SG6	6735	5310	4025	—	—	—	—	—	—	143	85.8
SDWS27500SS-RC10	127	JD4/SG8	7175	7045	7045	6320	4270	—	—	—	—	143	85.8
SDWS27500SS-RC10	127	JD5/SG6	6735	5310	5310	5415	3480	—	—	—	—	143	85.8
SDWS27600SS-RC10	152	JD4/SG8	7175	7045	7045	7045	7045	6085	4270	—	—	143	85.8
SDWS27600SS-RC10	152	JD5/SG6	6735	5310	5310	5310	5310	5310	3480	—	—	143	85.8
SDWS27800SS-RC10	203	JD4/SG8	7175	7045	8935	9125	9660	7045	7045	6085	—	143	85.8
SDWS27800SS-RC10	203	JD5/SG6	6735	6735	8140	8025	8945	5310	5310	5135	—	143	85.8
SDWS271000SS-RC10	254	JD4/SG8	7175	7045	8935	9125	9660	7045	7045	6085	6085	143	85.8
SDWS271000SS-RC10	254	JD5/SG6	6735	6735	8140	8025	8945	5310	5310	5135	5135	143	85.8

Conditions without numbers in the matrix shall not be used.
The main and side members shall have a characteristic density of 380 kg/m3 for JD5/SG6 and 450 kg/m3 for JD4/SG8.
The tabulated characteristic shear loads and withdrawal are for normal duration of load.
Screws shall be installed normal to the surface of the timber member.
Minimum fastener penetration shall be equal to the screw length less the thickness of the wood side member.
Tabulated characteristic values for withdrawal are in N/mm of thread length into the main member.

Table 3. Minimum Recommended Spacing for Connections with Strong-Drive^® SDWS Timber SS Screws.

Condition		Minimum Distance or Spacing (mm)
Edge Distance	Perpendicular to grain loading	38
Edge Distance	Parallel to grain loading	38
End Distance	Perpendicular to grain loading	150
End Distance	Parallel to grain loading	150
Spacing	Between fasteners in a row	150
	Between non-staggered rows	100
	Between staggered rows	19

Edge distances, end distances, and spacing of screws shall be sufficient to prevent splitting of the timber or as required in this table, or when applicable as recommended by the structural composite timber manufacturer, whichever is more restrictive.

Specifications - SDWS Timber SS Screw

Model No.	Size (mm)	Thread	Point	Head	Material & Finish	Box Qty	Drive Size	Replacement Bit
These fasteners possess a level of corrosion resistance that makes them suitable for use in some exterior and corrosive environments and with some preservative-treated timber. For applications in higher-exposure applications, consider Type-300 series stainless-steel fasteners for superior corrosion resistance. Bit(s) included with every box of screws. Pre-drilling and countersink may be necessary at ends, butt joints, and on applications where denser material is used. Follow board manufacturers recommendations where applicable.
SDWS27300SS-RC10	7 x 76	Bold Threads	SawTooth^™ Point	Washer Head	316 Stainless Steel	10	T-50, 6-lobe	BIT50T-2-R1
SDWS27400SS-RC10	7 x 102
SDWS27500SS-RC10	7 x 127
SDWS27600SS-RC10	7 x 152
SDWS27800SS-RC10	7 x 203
SDWS271000SS-RC10	7 x 254

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