ThruLOK

Through-Bolt Replacement
Deck post installation e3bb3f6a
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

Technical Bulletins / Installation Guides


Product Detail Drawings


Evaluation Reports


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)

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