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UNIDRIVE COMBINATION (PH/SQ) FLAT HEAD ZINC
SPAX® Multi-Purpose construction screws are a versatile multi-material fastener solution for a wide range of interior applications, including wood, concrete, masonry, sheet metal and plastic. Unidrive combination head can be used with either Phillips or square drive bit.
Available in: #10, #6, and #8 diameters
Purchase Options:
Material & Coating
Cold-rolled carbon steel wire, heat treated for strength and durability, and plated with zinc finish to prevent red rust. Clear zinc is tested and recognized for use in above ground contact pressure treated lumber for interior dry/damp general construction applications (e.g., AWPA UC1-UC2).
Features
- IRC / IBC Code Compliant DrJ TER No. 2010-02 Construction Screw Properties
- Heat treated for strength and durability
- Serrated threads offers faster drive, professional installation, and reduces splitting
- Unique 4CUT™ Point requires no pre-drilling
- Head designed to countersink flush with material
- Unidrive combination can be used with phillips or square drive bit
SPAX ENGINEERED FASTENERS ARE THE MOST ADVANCED FASTENER PRODUCT ON THE MARKET
Typical Applications
- Cabinet frames
- Hinge installation
- Wood crafts
- General purpose fastening
Downloads
Application Guides
Reference Lateral Shear Values
Product Brochures
Product Submittals
Design Values & Loads
Southern Pine(SG=.55)
| Diameter | #6 | #8 | #10 |
|---|---|---|---|
| Withdrawal W (lbs./inch) | 140 | 175 | 190 |
| Head Pull-Through WH (lbs.) | 179 | 157 | 315 |
Douglas Fir(SG=.50)
| Diameter | #6 | #8 | #10 |
|---|---|---|---|
| Withdrawal W (lbs./inch) | 133 | 133 | 176 |
| Head Pull-Through WH (lbs.) | 150 | 157 | 238 |
Hem Fir & Spruce-Pine-Fir(SG=.42)
| Diameter | #6 | #8 | #10 |
|---|---|---|---|
| Withdrawal W (lbs./inch) | 105 | 127 | 144 |
| Head Pull-Through WH (lbs.) | 125 | 123 | 177 |
Douglas Fir(SG=.50)
| Diameter | |
|---|---|
| Withdrawal W (lbs./inch) | |
| Head Pull-Through WH (lbs.) |
Plywood 15/32"(SG=.39)
| Diameter | #6 | #8 | #10 |
|---|---|---|---|
| Withdrawal W (lbs./inch) | 51 | 51 | 90 |
| Head Pull-Through WH (lbs.) | - | 120 | 151 |
OSB 19/32"(SG=.50)
| Diameter | #6 | #8 | #10 |
|---|---|---|---|
| Withdrawal W (lbs./inch) | 83 | 83 | 92 |
| Head Pull-Through WH (lbs.) | - | 120 | 177 |
Plywood 23/32"(SG=.50)
| Diameter | #6 | #8 | #10 |
|---|---|---|---|
| Withdrawal W (lbs./inch) | 134 | 162 | 186 |
| Head Pull-Through WH (lbs.) | - | 212 | 293 |
OSB 15/32"(SG=.50)
| Diameter | #6 | #8 | #10 |
|---|---|---|---|
| Withdrawal W (lbs./inch) | 29 | 36 | 54 |
| Head Pull-Through WH (lbs.) | - | 68 | 78 |
OSB 19/32"(SG=.50)
| Diameter | #6 | #8 | #10 |
|---|---|---|---|
| Withdrawal W (lbs./inch) | 36 | 48 | 54 |
| Head Pull-Through WH (lbs.) | - | 78 | 78 |
OSB 23/32"(SG=.50)
| Diameter | #6 | #8 | #10 |
|---|---|---|---|
| Withdrawal W (lbs./inch) | 52 | 52 | 66 |
| Head Pull-Through WH (lbs.) | - | 110 | 110 |
ALLOWABLE WITHDRAWAL (W) AND HEAD PULL-THROUGH (WH)
- Tabulated withdrawal and head pull-through design values (W) and (WH) are shown at a CD = 1.0. Tabulated withdrawal and head pull-through values shall be adjusted by all applicable adjustment factors per NDS Table 11.3.1.
- Full withdrawal strength is calculated by multiplying the length of thread embedded in the main member by the tabulated reference withdrawal values.
- Head pull-through values for #6 diameter and larger in Souther pine, Douglas-Fir, Hem Fir and Spruce-Pine-Fir are minimum 1.0" side member thickness.
- Head pull-through values for #8 diameter and larger in Southern Pine, Douglas-Fir, Hem-Fir and Spruce-Pine-Fir are minimum 1.5" side member thickness.
- For wood species with an assigned specific gravity between 0.42 and 0.50, use the tabulated values for specific gravity of 0.42. For wood species with an assigned specific gravity between 0.50 and 0.55, use the tabulated values for specific gravity of 0.50. For wood species with an assigned specific gravity greater than or equal to 0.55, use the tabulated values for specific gravity of 0.55.
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