ThruLOK

Through-Bolt Replacement
ThruLOK®: Through Bolt Replacement for Multiply Beams, Deck Posts
Rafter installation e1ef1a5c
Thru Lok components 614in components
Thru Lok 7in assembled
Thru LOK Family 2018 copy

The ThruLOK system combines the strength of a through-bolted connection with the speed of a LOK fastener with no predrilling required. It can be used for applications including multi-ply beams, deck posts, carrying beams and more.

No Pre-Drilling Required

Installs quickly with an 18 volt cordless drill without special drill bits or wrenches required.

Carriage & Through-Bolt Replacement

The 6 1/4" is engineered to connect 4x4 posts to 2x joists. The 7" is engineered to connect two 2x beams to a notched 6x6 post. The 8" is engineered to connect 4x4 posts to a double rim joist or single rim joist and 2x blocking. The 9 1/2" is engineered to attach a 6x6 post to two 2x beams.

Meets Code Requirements

ThruLOK's galvanized coating meets code requirements for treated wood. It's both ACQ Approved and IBC/IRC code compliant.

Thru Lok angled head

ThruLOK Through-Bolt Replacement

FastenMaster ThruLOK vs. Through-Bolts

Technical Bulletins / Installation Guides


Product Detail Drawings


Product Brochures


Structural Detail Drawings


  • ThruLOK - Deck Beam to Notched Support Post - Detail THLK01 (PDF)
  • ThruLOK - Deck Beam to Notched Support Post - Detail THLK01 (DWG)
  • ThruLOK - Deck Rail Post, Inside Front Rim - Detail THLK02 (DWG)
  • ThruLOK - Deck Rail Post, Inside Front Rim - Detail THLK02 (PDF)
  • ThruLOK - Deck Rail Post, Inside Corner - Detail THLK04 (PDF)
  • ThruLOK - Deck Rail Post, Inside Side Rim - Detail THLK03 (DWG)
  • ThruLOK - Deck Rail Post, Inside Side Rim - Detail THLK03 (PDF)
  • ThruLOK - Deck Rail Post, Inside Corner - Detail THLK04 (DWG)
  • ThruLOK - Size Selection Guide - Detail THLK05 (PDF)
  • ThruLOK - Pole Barn Header - Detail THLK06 (PDF)
  • ThruLOK - Size Selection Guide - Detail THLK05 (DWG)
  • ThruLOK - Pole Barn Header - Detail THLK06 (DWG)

Evaluation Reports


Part Numbers

LENGTHWOOD DIM RANGETYPICAL APPLICATIONSPACKAGING QTYSKU
6 1/4"  4 1/2" to 5 1/4"  4x4 deck posts to 2x rim joists connectionsSingle FastenerFMTHR614-INDY
24 pc boxFMTHR614-24
7"  5 1/4" to 6"  2x beams to a notched 6x6 post connectionsSingle FastenerFMTHR007-INDY
24 pc boxFMTHR007-24
8"  6 1/4" to 7"  4x4 posts to double rim joist or single rim joist and 2x blockingSingle FastenerFMTHR008-INDY
24 pc boxFMTHR008-24
9 1/2"  7 3/4" to 8 1/2"  2x beams to 6x6 post connectionsSingle FastenerFMTHR912-INDY