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SDWC Truss Screw

Model: SDWC

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The Strong‑Drive® SDWC Truss Screw provides a truss and rafter-to-top plate connection as well as a method to fasten stud-to-top and bottom plate. The fully-threaded shank engages the entire length of the fastener providing a secure connection.

The SDWC uplift values listed were analysed and calculated based on the characteristic values determined following AS1649-2001 (Timber-Methods of Test for Mechanical Fasteners and Connectors-Basic Working Loads and Characteristic Strength). The SDWC has also been tested in accordance with ICC-ES AC233 (screw) and AC13 (wall assembly and roof-to-wall assembly) for uplift and lateral loads between wall plates and vertical wall framing and between the top plate and the roof rafters or trusses.

Material

Carbon Steel

Finish
  • SDWC15450-KT: E‑Coat™
  • SDWC15600-KT: Clear Zinc Coating with Orange Topcoat
Features & Benefits
  • Cap Head countersinks fully into the double top plate to avoid interference with plasterboard or finish trades
  • Orange colour for easy inspection of 152 mm screws
  • Fully-threaded shank engages the entire length of the fastener, providing a secure connection between the roof and wall framing members
  • Type-17 Point for faster starts and easier driving
  • Wide tolerance on installation angle makes it easy to install the SDWC correctly — Installation guide included to help ensure proper installation angle
  • Can be installed from inside the structure, eliminating exterior work on the upper stories and enhancing job safety
  • Fastening can be performed before or after exterior sheathing is applied for added flexibility
  • Installation guide included in pack to help ensure proper installation angle
Applications
  • Truss/Rafter-to-Top Plate connection
  • Stud-to-Top and Bottom Plate connection
Model No. Table

Model No.

Fastener Length (mm)

Thread
Length (mm)

Diameter (mm)

Fastener Strength

Head

Major

Minor

Bending Yield Strength

(MPa)

Tension

(kN)

Shear

(kN)

SDWC15450-KT

114

108

8.31

5.97

3.86

1345

15.5

10.9

SDWC15600-KT

152

146
  1. For the purposes of measuring overall length, fasteners shall be measured from the top of the head to the end of the point. Length of thread includes the point.
  2. Bending yield strength is the 5%-offset value based on the minor diameter as determined following ASTM F1575.
  3. Tension and shear properties are average ultimate values. Shear strength is shear through the threads.
 
Characteristic Single-Shear Lateral Design Values for the Strong-Drive SDWC Truss Screws

Model No.

Fastener Length (mm)

Thread
Length (mm)

Side Member

Main Member

Lateral Characteristic Design Value, QkL (N)

Min. Thickness

(mm)

Grain

Min. Thickness

(mm)

Grain

QkL para

QkL perp

JD4

JD5

JD4

JD5

SDWC15450

114

108

35

Face

35

End

—

—

2220

2220

SDWC15600

152

146

2/35

Face

35

Edge

4200

3500

5300

5100

35

Face

35

End

—

—

2950

2650

2/35

Face

35

End

—

—

4650

4150
  1. The Main Member is the part where the fastener tip is embedded; the Side Member is part adjacent to the head.
  2. Minimum penetration into the main member shall be 25mm.
  3. The main and side members shall be sawn timber or structural composite timber with the design density or equivalent design density typical of JD4 and JD5 grades.
  4. Screws shall be installed into the side grain of the wood side member with the screw axis at a 90-degree angle to the surface of the member.
  5. Para: Parallel-to-grain loading in the side member and perpendicular-to-grain loading in the main member.
  6. Perp: Perpendicular-to-grain loading in the side member and perpendicular-to-grain loading in the main member, except where the main member is loaded parallel-to-grain.
 
Characteristic Withdrawal and Pull-Through for the Strong-Drive SDWC Truss Screws

Model No.

Thread
Length (mm)

Thread
Length (mm)

Main Member

Withdrawal

Characteristic

Design Value, Qkw

(N/mm)

Pull-Through

Characteristic

Design Value, Qkp

(N/mm)

Min. Thickness

(mm)

Grain

JD4

JD5

JD4

JD5

SDWC15450

114

108

35

Edge

133

84

—

—

SDWC15600

152

146

35

End

78

50

96

82

35

Face

110

75

108

97

2/35

Face

118

102

131

105
  1. Withdrawal and pull-through characteristic values are in N/mm of thread penetration into the main member and side member, respectively.
  2. Face and edge installations are at 90 degrees to the grain and end installation is along the grain.
  3. Withdrawal and Pull-through loads shall be checked against tension strength in design.
 
Connection Geometry for Strong-Drive SDWC Truss Screws

Condition

Minimum Distance or Spacing (mm)

SDWC15450/SDWC15600

Edge Distance

Load in any direction

13

End Distance

Load along grain toward end

50

Load along grain way from end

50

Loading across grain (including withdrawal loads)

25

Spacing Between Fasteners in a Row

Loaded parallel grain 

90

Loaded perpendicular to the grain

60
  1. 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.
  2. Edge and end distances based on Evaluation Report 262.
 

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