Strong-Drive® SDHR COMBO-HEAD Screw
Strong-Drive® Interior Wood Screws
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Product Details
The Strong-Drive SDHR Combo-Head screw is a structural fastener designed for cross-laminated timber construction, mass timber construction and general interior applications. These partially-threaded, sturdy 0.390"- and 0.470"-diameter structural fasteners are designed to pull structural members together while providing excellent connection strength. The “combination” head allows for driving using either a hex driver bit or T40 6-lobe driver bit. The SDHR Combo-Head has an interior-grade, blue zinc coating, a robust knurled shank and Type-17 point for fast starts and low-torque driving.
Key Features
- Designed for use with steel side plates
- Can be driven by either a hex-head or 6-lobe driver bit
- Heavy-duty, partially threaded shaft with knurl provides strength, with superb pull-out resistance
- Type-17 point ensures fast starts, reduces installation torque and eliminates the need for predrilling in most applications
- Deep T40, 6-lobe recess for a secure drive (replacement bit: BIT40T-134-R2)
- Interior grade blue-zinc coating
Applications
- Steel-to-wood connections
Related Links
Catalog Pages
- Fastener Product Information: C-F-2023 (Fastening Systems), page 99
- Fastener Technical Data and Loads: C-F-2023TECHSUP, pages 138–139
Related Literature
Product Information Table
| Model No. | Coating/Material | Length (in.) | Head Diameter (in.) | Shank Diameter (in.) | Drive Type | Head Type | Thread Length (in.) | Point Type | Packaging Qty. |
|---|---|---|---|---|---|---|---|---|---|
| SDHR27400 | Blue-Zinc Coated | 4 | 0.590 | 0.275 | T40 6-Lobe or Hex-Head | Combination | 2 1/8 | Type-17 Point | 100 |
| SDHR27400-R25 | Blue-Zinc Coated | 4 | 0.590 | 0.275 | T40 6-Lobe or Hex-Head | Combination | 2 1/8 | Type-17 Point | 25 |
| SDHR27614 | Blue-Zinc Coated | 6 1/4 | 0.590 | 0.275 | T40 6-Lobe or Hex-Head | Combination | 4 3/8 | Type-17 Point | 100 |
| SDHR27614-R25 | Blue-Zinc Coated | 6 1/4 | 0.590 | 0.275 | T40 6-Lobe or Hex-Head | Combination | 4 3/8 | Type-17 Point | 25 |
| SDHR31400 | Blue-Zinc Coated | 4 | 0.669 | 0.315 | T40 6-Lobe or Hex-Head | Combination | 2 1/8 | Type-17 Point | 100 |
| SDHR31400-R25 | Blue-Zinc Coated | 4 | 0.669 | 0.315 | T40 6-Lobe or Hex-Head | Combination | 2 1/8 | Type-17 Point | 25 |
| SDHR31614 | Blue-Zinc Coated | 6 1/4 | 0.669 | 0.315 | T40 6-Lobe or Hex-Head | Combination | 4 3/8 | Type-17 Point | 100 |
| SDHR31614-R25 | Blue-Zinc Coated | 6 1/4 | 0.669 | 0.315 | T40 6-Lobe or Hex-Head | Combination | 4 3/8 | Type-17 Point | 25 |
Load Tables
SDHR COMBO-HEAD Screw — Allowable Lateral Design Values for Single-Fastener, Steel-to-Wood Connections
- The main member must be sawn lumber, glulam, or CLT with an assigned specific gravity (SG) as shown in the table above or an engineered wood product with a minimum grade of 1.3E and equivalent SG of at least 0.50.
- Tabulated reference allowable lateral design values (Z) are shown for normal duration of load (CD = 1.0). Loads may be increased for load duration as permitted by the building code up to a CD = 1.60.
- Screws must be installed into the face or side grain of the wood main member with the screw axis at a 90-degree angle to the wood surface.
- Minimum fastener penetration must be equal to the screw length less the thickness of the side member.
- Tabulated reference lateral design values apply to combinations of parallel- and perpendicular-to-grain loading.
SDHR COMBO-HEAD Screw — Allowable Withdrawal Design Values
- The tabulated reference allowable withdrawal design value, W, is in pounds per inch of the thread penetration into the side grain or face grain of the main member. Thread penetration is the portion of the threaded length held in the main member, including the screw point.
- The tabulated reference withdrawal design values, W, are shown for normal duration of load (CD = 1.0) and must be multiplied by all applicable adjustment factors from the NDS as referenced in the IBC or IRC.
- Wood main members must have an assigned specific gravity (SG) as indicated in the table or for engineered wood products, a minimum grade of 1.3E and equivalent SG of 0.50.
SDHR COMBO HEAD Screw — Allowable Head Pullover Design Values
SDHR COMBO-HEAD Screw Spacing Requirements
- For SDHR27 screws subject to axial loading only, use the following minimum dimensions: end distance = 4", edge distance = 1 5/8", spacing parallel to grain = 2 7/8", spacing perpendicular to grain = 2".
- For SDHR31 screws subject to axial loading only, use the following minimum dimensions: end distance= 4 3/4", edge distance = 2", spacing parallel to grain = 3 3/8", spacing perpendicular to grain = 2 3/8".
- Minimum steel edge distance, end distances and spacing of the screws shall be determined in accordance with AISC 360.
Code Reports & Compliance
Drawings
| DWG | DXF | RFA | IFC | SAT | |||
|---|---|---|---|---|---|---|---|
