LedgerLOK Structural Wood Screw

LedgerLOK is a code-compliant structural wood screw engineered to fasten a deck ledger board to the rim joist of a house with no predrilling. LedgerLOK replaces lag screws and through-bolts, has been coated with a proprietary three-step coating process that protects against corrosion (even in pressure treated wood) and is ACQ approved.

The built-in washer head eliminates the need for an additional washer, saving time and money. The large hex-head allows for greater bit engagement, reducing cam-out.

For LedgerLOK technical information and drawings, see the Technical Docs section below. For technical documentation of all our structural wood screws, see our Technical Resources page.


LedgerLOK Deck Ledger to Rim Board Connection

Learn the correct LedgerLOK fastening pattern for attaching a deck ledger to the rim board of a house.

Deck Ledger tech bulletin

Visit LedgerLOK product page

LedgerLOK vs. 1/2" Lag Screws

This comparison video demonstrates time saved using the LedgerLOK Structural Wood Screw in place of lags when connecting a deck ledger to the rim joist of a house.

  • Sku Selections
  • Installation
  • Technical Docs
  • Purchase FM Products
LedgerLOK SKU Selection Guide
 3 5/8"   12 pc clamshell   FMLL358-12
50 pc box FMLL358-50
250 pc bucket FMLL358B-250
 5"   12 pc clamshell   FMLL005-12
50 pc box FMLL005-50
250 pc bucket FMLL005B-250


LedgerLOK should be installed using an impact driver or high torque, 1⁄2" variable speed drill (at least 18V if cordless). Choose the proper length LedgerLOK so that threads fully engage the rim material. Bring washer flush to the ledger- do not countersink. Not for use in masonry or concrete

ICC-ES Report, ESR 1078

The ICC-ES Evaluation Report demonstrates to the installer and code official that our LOK fasteners comply with the most current building codes. This report also provides the engineer with critical values needed to design safe installations. Reports from ICC-ES are the most recognized reports used by code officials across the U.S. This document can be shared with code officials, engineers, architects and specifiers who may have questions regarding proper use or code compliance of LOK fasteners.

Technical Evaluation Reports (TERs)

TERs qualify for building official approval and are developed from test reports that comply with IBC Section 104.11.1

Technical Bulletins

FastenMaster technical bulletins are abridged versions of our TERs that demonstrate general guidelines and fastening patterns.

Deck Ledger to Rim Joist Technical Bulletin

This file contains the Deck Ledger to Rim Joist Technical Bulletin for Canada in both English and French

Deck Ledger to Rim Joist Technical Bulletin - Canadian Version

This file contains the Deck Ledger to Rim Joist Technical Bulletin for Canada in both English and French

DWG Drawings

For use in CAD software

Warranty Information

LedgerLOK Guarantee of Performance

This file contains information regarding LedgerLOK guarantee of performance.

Catalog Pages

Product specific pages from our FastenMaster catalog.

Code Compliance Reports

Code Compliance Reports by State

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