To the top

New Zealand International

Product Tabs

Product Details
SDWS TIMBER SS Screw
SDWS TIMBER SS Screw
SDWS TIMBER SS Screw Sizes
SDWS TIMBER SS Screw Sizes
SDWS TIMBER SS Screw
SDWS TIMBER SS Screw
SDWS TIMBER SS Screw
SDWS TIMBER SS Screw
SDWS TIMBER SS Screw
SDWS TIMBER SS Screw
SDWS TIMBER SS Screw
SDWS TIMBER SS Screw
SDWS TIMBER SS Screw
SDWS TIMBER SS Screw
SDWS27300SS Illustration
SDWS27300SS Illustration
SDWS TIMBER SS Screw Illustration
SDWS TIMBER SS Screw Illustration

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, Wharf, Pier, Boardwalk applications
  • Jetty, Wharf and Marina construction
  • Ideal replacement for Spikes, Lag Bolts, Lag Screws, Coach Screws
Model No. Table

SDWS-SS Technical Data

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

Model

Head Marking
(##)

Screw Length
(mm)

Thread Length1,2 (mm)

Diameter (mm)

Fastener Strength

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

  1. Fastener length is measured from the underside of the head to the point.
  2. Length of thread includes the point.
  3. Bending yield moment calculated from characteristic tensile strength and based on minor thread diameter.
  4. 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 SG8 (upper) and 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

SDWS27300SS-RC10

76

SG8

4535

143

85.8

SG6

4320

123

73.8

SDWS27400SS-RC10

102

SG8

7475

6320

4510

143

85.8

SG6

6735

5310

4025

143

85.8

SDWS27500SS-RC10

127

SG8

7175

7045

7045

6320

4270

143

85.8

SG6

6735

5310

5310

5415

3480

143

85.8

SDWS27600SS-RC10

152

SG8

7175

7045

7045

7045

7045

6085

4270

143

85.8

SG6

6735

5310

5310

5310

5310

5310

3480

143

85.8

SDWS27800SS-RC10

203

SG8

7175

7045

8935

9125

8945

7045

7045

6085

143

85.8

SG6

6735

6735

8140

8025

9660

5310

5310

5135

143

85.8

SDWS271000SS-RC10

254

SG8

7175

7045

8935

9125

8945

7045

7045

6085

6085

143

85.8

SG6

6735

6735

8140

8025

9660

5310

5310

5135

5135

143

85.8

  1. Conditions without numbers in the matrix shall not be used.
  2. The main and side members shall have a characteristic density of 380 kg/m3 for SG6 and 450 kg/m3 for SG8.
  3. The tabulated characteristic shear loads and withdrawal are for normal duration of load.
  4. Screws shall be installed normal to the surface of the timber member.
  5. Minimum fastener penetration shall be equal to the screw length less the thickness of the wood side member.
  6. 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

Parallel to grain loading

38

End Distance

Perpendicular to grain loading

150

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

 
Technical Data & Docs

Warranty

Warranty

Masterspec
Inspiration
Request a Demo

Request a Demo/Sample

Experience the innovation design of Simpson Strong-Tie's products and how we can help you build safer, stronger structures. Please fill out your details and submit the form below. We’ll be in touch to schedule a time to talk and give you a personal demo of Simpson Strong-Tie products.

Request a Demo/Sample

Experience the innovation design of Simpson Strong-Tie's products and how we can help you build safer, stronger structures. Please fill out your details and submit the form below. We’ll be in touch to schedule a time to talk and give you a personal demo of Simpson Strong-Tie products.

Structural Connections

 

Unmatched Quality from the Truss to the Foundation

With nearly 60 years of field and R&D experience, Simpson Strong-Tie® timber connectors are manufactured to the industry's highest standards. From framing angles to straps to heavy-duty joist hangers, we offer the most diverse product line so that you have the right product for the job.

Simpson Strong-Tie® connectors offer unmatched quality with laboratory and field testing, and are backed by our uncompromising commitment to customer service. As the company that built the connector industry, you can count on Simpson Strong-Tie® to work closely with builders, engineers and building officials to deliver innovative, building code-compliant solutions to help build safer, stronger structures economically. Download the Timber Connectors NZS 3604 Catalogue.

Timber Connectors

From testing to service to availability, everything we do is engineered to ensure your project's success. With every product, you know you are getting the quality, value, service and on-time delivery that we have built our reputation on for the past 60 years.

From straps and ties to joist hangers and much more, Simpson Strong-Tie® structural connectors increase the strength and safety of timber-frame structures. Each connector is unique to Simpson Strong-Tie and is designed for specific applications without the need to adapt metal plating to suit a connection. Download the Timber Construction Connectors Catalogue.

Steel Frame Connectors

From fully tested and engineered connectors and clips Simpson Strong-Tie® provides comprehensive structural solutions for cold-formed steel construction. From steel-to-steel connections to full-scale lateral solutions and curtain wall connectors, we remain committed to developing new technology that helps to advance the cold-formed steel industry.

Find out how Simpson Strong-Tie timber connectors can help you build the right way every day. Download the Cold-Fromed Steel Construction Connectors Catalogue.