SFS Dekfast 785851, #12-13 X 8 inch Roofing Screws. #3 Phillips Drive, 13 TPI, Drill Point. 500/Carton. Price/Carton. Currently Unavailable until Late October 2021
- Color could be light gray or black and is not selectable.
SFS Dekfast 785851 is a #12-13 x 8 inch Roofing Screw is used for insulation attachment to structural concrete, wood and steel roof decks. Comes with #3 Phillips drive. The drill point design prevents fastener walking and it cuts through gravel and BUR. 13 threads per inch offers higher pull-out values.
For insulation attachment to Structural Concrete, Wood and Steel Roof Decks.
- Steel thickness from 22 ga (.028 inch)
- through 18 ga (.045 inch): Min penetration: 3/4 inch
- Wood 2x (1-1/2 inch thick): Min penetration: 1 inch
- Plywood: Min thickness: 3/4 inch
- FR treated; min through penetration: 1/4 inch
- Dekfast 2-7/8 inch hex metal plates
- Dekfast 3 inch round plastic Dekflat plates
Coated Steel Roofing Screws, No. 12 with a self-drilling point. The screws have a 0.2-mil (0.005 mm) galvanized plating and a 1-mil (0.025 mm) fluorocarbon coating.
- Drill point design prevents fastener walking
- Drill point cuts through gravel and BUR
- 13 threads per inch for ease of installation in concrete decks
- Deep #3 recess provides ultimate bit engagement
- Head Types: #3 Phillips
- Head Height: Max 0.118 inch
- Head Dia: Max 0.448 inch
- Thread Major Dia: 0.222 inch
- Shank Dia: 0.167 inch
Strength (lbs ult.)
- Tensile: 2410
- Torsional: 76 in-lbs min
- Shear: 1815
Pull-out (lbs avg.)
- Steel 22 ga: 513
- Steel 20 ga: 695
- Steel 18 ga: 787
- 4000 psi concrete: 850 (1 inch min penetration)
- 2x dimensional lumber (1 inch penetration): 462
- 3/4 inch FR Plywood (through penetration): 575
Dekfast fasteners and plates are Metro Dade and Factory Mutual approved for attachment of insulation board to roof deck. Refer to FM Approval Guide and Supplements for current FM approved insulation fastening patterns. #12 fasteners exceed Factory Mutual corrosion-resistance Standard 4470.
2000 – 2500 rpm screw guns with hardened #3 Phillips. #12 Dekfast fasteners are available pre-assembled with metal or plastic insulation plates.
- #12 from 1-5/8 to 8 inches
- #14 from 1-1/4 to 12 inches
- #15 from 1-1/4 to 26 inches
- #12 hex head from 1-5/8 to 8 inches
- #12 assembled to 3 inch round plates
- #12 Isofast belted
- #15 Isofast belted
similar product terms: deck screw, roofing insulation screw, roofing screw, dekfast, dek fast, roofing fasteners, membrane fasteners, SFS, membrane screws, insulation board fasteners, insulation board screws
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