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SDWS Timber Screw (Interior Grade) — Allowable Shear Loads — Douglas Fir–Larch and Southern Pine

See footnotes below.

SDWS Timber Screw (Interior Grade) — Allowable Shear Loads — Spruce-Pine-Fir and Hem-Fir

1. Design values are based on full fastener embedment and the adjacent members are in contact with each other.
2. Allowable loads are shown at the wood load duration factor of C_D = 1.0. Loads may be increased for load duration up to a C_D = 1.6.
3. Tabulated values must be multiplied by all applicable adjustment factors per the NDS.
4. For minimum fastener spacing requirements for both side and main members, see the Spacing Requirements Figure and Table below.
5. Loads are for in-service moisture content less than or equal to 19% (C_M=1.0).
6. Loads are based on installation into the side grain of the wood member with the screw axis perpendicular to the face of the wood member.

SDWS Timber Screw (Interior Grade) Spacing Requirements

1. For SDWS19 screws subject to axial loading only, use the following minimum dimensions: end distance = 2 3/4", edge distance = 1 1/8", spacing parallel to grain = 2", spacing perpendicular to grain = 1 1/8".
2. For SDWS22 screws subject to axial loading only, use the following minimum dimensions: end distance = 3 1/4", edge distance = 1 3/8", spacing parallel to grain = 2 1/4", spacing perpendicular to grain = 1 3/8".

SDWS Timber Screw (Interior Grade) — Allowable Withdrawal Loads — Douglas Fir–Larch, Southern Pine, Spruce-Pine-Fir and Hem-Fir Lumber

1. The tabulated reference withdrawal design value, W, is in pounds per inch of the thread penetration into the side grain of the main member.
2. The tabulated reference withdrawal design value, W_max, is in pounds where the entire thread must penetrate into the side grain of the main member.
3. Tabulated reference withdrawal design values (C_D=1.0), W and W_max, must be multiplied by all applicable adjustment factors from the NDS as referenced in the IBC or IRC.
4. Embedded thread length is that portion held in the main member, including the screw point.
5. Values are based on the lesser of withdrawal from the main member or pull-through of a 1.5" side member.
6. Loads are for in-service moisture content less than or equal to 19% (C_M=1.0).

Wood Species Combinations in the Specific Gravity Range 0.35 to 0.41

Allowable Loads for Strong-Drive SDWS Timber Screws (Interior Grade) with Expanded Specific Gravity Options

Allowable load tables below provide shear and withdrawal capacities for wood species with an assigned specific gravity of 0.35 to 0.41. Wood species with a specific gravity within this range are provided below.

1. For SDWS19 screws subject to axial loading only, use the following minimum dimensions: end distance = 2 3/4", edge distance = 1 1/8", spacing parallel to grain = 2", spacing perpendicular to grain = 1 1/8".
2. For SDWS22 screws subject to axial loading only, use the following minimum dimensions: end distance = 3 1/4", edge distance = 1 3/8", spacing parallel to grain = 2 1/4", spacing perpendicular to grain = 1 3/8".

SDWS Timber Screw (Interior Grade) — Allowable Lateral Loads in the Specific Gravity Range 0.35 to 0.41

1. Design values are based on full fastener embedment and the adjacent members are in contact with each other.
2. Allowable loads are shown at the wood load duration factor of C_D = 1.0. Loads may be increased for load duration per the building code up to a C_D = 1.6. Tabulated values must be multiplied by all applicable adjustment factors per the NDS.
3. For minimum fastener spacing requirements for both side and main members, see the Spacing Requirements Figure and Table above.
4. For in-service moisture content less than or equal to 19% (C_M=1.0).
5. The load tables are based on testing in accordance with ICC-ES AC233, with an applied factor of safety of 5.0.

SDWS Timber Screw (Interior Grade) — Allowable Withdrawal Loads in the Specific Gravity Range 0.35 to 0.41

1. The tabulated reference withdrawal design value, W, is in pounds per inch of the thread penetration into the side grain of the main member.
2. The tabulated reference withdrawal design value, W_max, is in pounds where the entire thread must penetrate into the side grain of the main member.
3. Tabulated reference withdrawal design values, W and W_max, are shown at the wood load duration factor of C_D = 1.0. Loads may be increased for load duration per the building code up to a C_D = 1.6. Tabulated values must be multiplied by all applicable adjustment factors per the NDS as referenced in the IBC or IRC.
4. Embedded thread length is that portion held in the main member including the screw point.
5. Values are based on the lesser of withdrawal from the main member or pull-through of a 1.5" side member.
6. For in-service moisture content less than or equal to 19% (C_M=1.0).
7. The load tables are based on testing in accordance with ICC-ES AC233, with an applied factor of safety of 5.0.

Code Reports & Compliance

Drawings