HeadLOK Heavy Duty Flathead Fastener by FastenMaster

HeadLOK Heavy Duty Flathead Fastener by FastenMaster

DecksDirect Item #5535

HeadLOK Heavy Duty Flathead Fastener by FastenMaster

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Starting at: $11.99

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 Durable   DIY Friendly   Authorized Dealer

FastenMaster deck screws and fasteners are considered to be the gold standard... Learn More



The Headlok Heavy Duty Flathead Fastener by Fastenmaster is the perfect wood screw for wood-to-wood applications. The unique design gives higher shear strength than a 3/8" lag screw, eliminates the need for pre-drilling, and features a non-countersinking head, making it fast, strong, and easy. Save time and money on projects such as deck frames, wood cabinetry, fencing, and more with the Headlok Heavy Duty Flathead Fastener by Fastenmaster.

Product Specifications

Drive TypeSpider Drive
Head TypeWafer head
Screw Length2-7/8", 4-1/2", and 6"
Screw Size5/16"
Material Type1022 Carbon Steel Grade with a proprietary corrosion resistant coating
Pack Size

12, 50, 250, and 500 (500 available only for 2-7/8")

Coverage Estimaten/a
Included Accessories2" Spider Drive Bit
WarrantyHeadLOK Guarantee of Performance
OtherACQ approved
Not designed for use within 1000 ft of salt water
Made in the U.S.A.

Additional Information

Additional Information

DecksDirect Item # 5535
Manufacturer FastenMaster

Installation Instructions (450 KB) 

ICC-ES Evaluation Report (281 KB) 

Technical Evaluation Report (487 KB) 


FastenMaster logo

FastenMaster deck screws and fasteners are considered to be the gold standard among professionals. With over a dozen options to choose from, you can be sure you’ll find the perfect hardware for any decking project.


authorized retailer

FastenMaster is constantly expanding their product line in order to ensure customers get exactly what they need at the right price. The TimberLOK Truss Screws are designed for wood-to-wood projects while the ThruLOK Screw Bolts secure posts and beams without the need for pre-drilling. The LedgerLOK Ledger Board Fasteners are some of the best available and could easily be considered the industry-standard.


FastenMaster products are recommended by professionals for quick but long-lasting results with no pre-drilling and a higher shear strength than lag screws, available here at DecksDirect.

Features and Benefits
  Durable Quality This brand offers products that are built to last and withstand the elements.
  DIY Friendly This brand is reliable and easy-to-install for professionals and DIYers alike.
  Authorized Dealer DecksDirect is an authorized dealer of this brand, dedicated to service and selection for our customers nationwide.
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