ThruLok Screw Bolt by FastenMaster

ThruLok Screw Bolt by FastenMaster

DecksDirect Item #6161

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Starting at: $23.99

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



Strength Meets Speed. ThruLok offers the speed of a LOK fastener with the strength of a through-bolted connection. No need for pre-drilling or a wrench, simply install with a drill in seconds. The ThruLok's galvanized coating makes it compatible with ACQ treated lumber. ThruLok is backed by a lifetime performance guarantee.

ThruLok is the newest addition to the FastenMaster LOK Line of structural wood-to-wood fasteners. ThruLok offers the speed of a LOK Line Product and the strength of a through bolted connection.

ThruLok is a three part assembly including a ThruLok fastener featuring the patent pending Paddle Point, engineered washer, and LOK-Nut.

ThruLok comes in specific lengths that allow contractors to replace their 1/2" carriage and through bolts in three primary deck applications:
- 6-1/4" fastener - Single 2x to 4x Decking Posts
- 7" fastener - Notched 6x Carrying Beams
- 8" fastener - Double 2x to Single 4x Decking Posts

Product Specifications

Drive TypeHex
Head TypeHex
Screw Length6-1/4", 7" and 8"
Screw Size1/4"
Material TypeGalvanized steel
Pack Size6 and 24 packs
Coverage Estimaten/a
Included Accessories6 Pack: (6) ThruLok Fastener, (6) ThruLok-Nut, (6) ThruLok-Washer and (1) 5/16" Hex driver bit
24 Pack: (24) ThruLok Fastener, (24) ThruLok-Nut, (24) ThruLok-Washer and (1) 5/16" Hex driver bit
WarrantyLifetime performance guarantee
OtherNo predrilling required




Additional Information

Additional Information

DecksDirect Item # 6161
Manufacturer FastenMaster

ThruLok Product Literature (454 KB) 

ThruLok Deck Rail Post to Rim Joist Technical Bulletin (379 KB) 

ThruLok Carrying Beam to Notched Support Post Technical Bulletin (230 KB) 


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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.


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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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