FastenMaster GuardDog Exterior Wood Screws - 1350 Count - 3-1/2"

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Quick ID: Q58
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There is a rolling change taking place with GuardDog screws. The drive type is changing from Pozi square to a Torx ttap drive. Please contact us if you require a specific drive. If not, we will ship the component that is currently available.


  • Torx Ttap drive delivers stick fit, wobble-free installation
  • Cutting nips help clean out under head for splinter-free surface
  • Type 17 point for quick installation
  • Superior ACQ Approved corrosion resistant coating
  • Aggressive threads for strong holding power and withdrawal strength
  • Free Torx Ttap 25 bit included


FastenMaster GuardDog Exterior Wood Screws - 1350 Count - 3-1/2" is a versatile exterior wood screw used for a variety of applications including pressure-treated decking, railings, stair stringers, deck frame blocking, dimensional headers, pergolas and more. Fully tested, fully guaranteed in pressure-treated lumber, cedar, redwood, and chemically treated lumber for the life of the project.

Installation allows you to use a 0-1800 RPM variable speed drill (at least 14.4V if cordless). Use the PoziSquare driver bits provided and install fasteners perpendicular to the deck. Increase drill speed as the screw threads into the deck. Slightly countersink and do not overdrive. If cam-out occurs, be sure to remove and replace the screw.


Manufacturer Part NumberFMGD312-1350
Sub BrandGuardDog
Bit SizeT25
Compatible ToolsStandard T25 TORX Driver Bit
Coverage (Square Feet)375 SF of Deck Surface Based on a Fastening Pattern of 2 Screws per Joist, Spaced every 16", into Standard 6" Wide Decking
Driver Bit IncludedYes
Included AccessoriesTORX Ttap Bit
Installation MethodTwo Fasteners per Deck-to-Joist Connection. Predrilling Recommended Only When Fastening within 1-1/2" of End of Board or Using Hardwoods
Number of Screws1350
Package Quantity1350
Screw Drive TypeTorx Ttap
Screw Head StyleTORX ttap Drive System
Screw Point TypeType 17 Auger Tip
WarrantyFully Tested, Fully Guaranteed in ACQ, Cedar, Redwood and Copper Azole

Weights and Dimensions

Weight (Pounds)25
Length (Inches)3.5

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