Model # FMTHR008-6

Internet #202618097

Store SKU #342054

Store SO SKU #336802

FastenMaster ThruLok 6-Piece 8 in. Screw Bolt Fastening System


ThruLok 6-Piece 8 in. Screw Bolt Fastening System

$2237 /each

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Frequently Bought Together

Product Overview

Meet code and lower installed costs. Introducing FastenMaster’s ThruLok screw bolt fastening system, which replaces 1/2 in. Carriage or through-bolts without pre-drilling. ThruLok installs quickly with an 18 volt cordless drill and doesn’t require special bits or wrenches. The three part kit assembly includes a ThruLok fastener featuring the patent pending Paddle Point, engineered washer, and Lok-Nut. No need to count out bolts, nuts and washers. The product’s galvanized coating meets current IRC ACQ corrosion requirements and is guaranteed for the life of the project. ThruLok is also a code compliant replacement for 1/2 in. Carriage or through-bolts. This fastener comes in specific lengths to tackle primary deck applications. Installation instructions and code documentation are included in each box.

  • Replaces 1/2 in. carriage or through-bolts without pre-drilling
  • Installs with an 18 volt cordless drill
  • No special bits or wrenches needed
  • Meets all corrosion requirements. Guaranteed for life of the project
  • Code compliant fastening method with current code documentation
  • Installation/code bulletins included in each box
  • Manufactured in specific lengths to tackle primary deck applications: 8 in. fastener, double 2x to single 4x decking posts



Assembled Depth (in.)
1.5 in
Assembled Height (in.)
6.75 in
Assembled Width (in.)
1.5 in
Fastener length (in.)
Head diameter (in.)
Screw Length
8 in


ACQ Rated Fastener
Drive Style
External Hex
Driver bit included
Fastener Callout Size
8 in
Fastener Head Style
Fastener Plating
Fastener Thread Type
Fastener Type
Wood Screw
Fastener/Connector Material
Finish Family
Head Style
Measurement Standard
Package Quantity
Primary Use
Replaces ½” Carriage or Through-bolts in deck applications including decking posts or carrying beams
Product Weight (lb.)
Self drilling
Self tapping
Tamper Resistant

Warranty / Certifications

Manufacturer Warranty
FastenMaster fully guarantees ThruLok against rusting or streaking for the lifetime of the project. Please see the following link for further details at:

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Customer Questions & Answers

Can this replace 5/16in Galvanized Hex Bolt, Nut & Washer for deck mounting rail post?

The surface mount post sleeve I am looking to purchase only comes with bolts for concrete surface application. However, the application I am using it for will be of composite decking and pressure treated wood structure. The post sleeve product recommends using 5/16in x 5in galvanized bolts, 5/16in galvanized nuts & 5/16 galvanized fender washers. Unfortunately, my local hardware store does not sell the 5/16in nuts and washers - only the 5/16in carriage bolts. Is your Thrulock screw bolt fastening system a good replacement for this requirement or do you have another product that will do the job better?
Asked by: Debra
  • y_2017, m_7, d_25, h_10CST
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Customer Reviews

ThruLok 6-Piece 8 in. Screw Bolt Fastening System is rated 5.0 out of 5 by 4.
Rated 5 out of 5 by from Excellent product. For about the same price as a 1/2" galvanized lag bolt, 2 washers and a nut y... Excellent product. For about the same price as a 1/2" galvanized lag bolt, 2 washers and a nut you get roughly the same amount of strength in an assembly that takes a small fraction of the time to install. For a large deck, with many beam to post connections, these can shave some serious time off the project!
Date published: 2017-04-05
Rated 5 out of 5 by from Cant believe how easy they work My sons have used these on a couple of projects and they work well, are fast to install and require no added tools. My 7 and 13 year old sons used these to attach handrail brackets to 6x24 inch beams and they installed 48 of them with a Hole Hog in under 30 minutes.
Date published: 2015-05-14
Rated 5 out of 5 by from Fast application No pre-drilling needed and everything comes with it (washer, fastner, and bit).
Date published: 2015-06-29
Rated 5 out of 5 by from ThruLok SWEET This has got to be the best and easiest way to put lumber together. No holes to drill out before you put a lag-bolt in place... Just level the boards together and screw in the ThruLok and fasten on. A must for working on decks. THANKS
Date published: 2014-02-25
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