FlatLok Structural Wood Screws 6-3/4" - Bucket of 200

by FastenMaster
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FastenMaster FlatLOK is a multi-purpose structural wood-to-wood fastener that is an alternative fastening method to using nails and through bolts when attaching multi-ply LVL, dimensional beams and girder trusses. FlatLOK is easy-to-use because it requires no predrilling, thereby saving time and money. The flat head sits flush, allowing for easy application of drywall or trim. In addition, FllatLOK is approved for single-sided installation making the job easier to complete both at ground level or for elevated applications. FastenMaster FlatLOK wood screw features TORX(R) ttap(R) drive system that maximizes bit fit, reducing the potential for stripping. The stability button allows for maximum penetration into the fastener and a wobble-free drive. A free TORX ttap bit is included in every box. FlatLOK is tested and supported by engineering data that conforms to the most current ICC standards. It is also approved for use in ACQ or treated lumber. FlatLOK should be installed using an impact driver or high torque 1/2" variable speed drill (minimum 18V if cordless). No predrilling is required when properly installed. Bring fastener flush with wood surface, do not overdrive. LVL Beams: Refer to FastenMaster's online technical bulletins and engineered wood manufacturer's technical information for complete load and engineering requirements. For applications other than those listed above, a Professional Engineer (PE) may be consulted to determine proper connection design.


  • 6-3/4" FlatLok is used primarily for attaching 4-Ply LVL beams or attaching 2x4x2
  • requires no predrilling
  • flat head sits flush, allowing for easy application of drywall or trim
  • approved for single-sided installation
  • TORX® ttap® drive system maximizes bit fit and reduces the potential for stripping
  • free TORX ttap bit is included in every box
  • FastenMaster FlatLOK Structural Wood Screw
Manufacturer Part NumberFMFL634B-200
Sub BrandFlatLok
Application4-Ply LVL Beams
Driver Bit IncludedYes
Included AccessoriesTORX ttap bit
Installation Tools RequiredImpact driver or high torque 1/2" variable speed drill (minimum 18V if cordless)
Package Quantity200
Screw Drive TypeTORX ttap
Screw Head StyleFlat
WarrantyFlatLOK is guaranteed not to rust or corrode for the life of the project. FlatLOK is not recommended for use in saltwater applications (within 1,000ft). Not intended for use on exterior deck ledgers
Ships to HI/AKYes