Specification
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Copyright © 2014  Page 1 of 8 
1000 
ICC-ES Evaluation Report
  ESR-1078 
Reissued January 1, 2014 
  This report is subject to renewal January 1, 2015. 
www.icc-es.org | (800) 423-6587 | (562) 699-0543   A Subsidiary of the International Code Council 
®
DIVISION: 06 00 00—WOOD, PLASTICS AND 
COMPOSITES 
Section: 06 05 23—Wood, Plastic, and Composite 
Fastenings 
REPORT HOLDER: 
OMG, INC. 
153 BOWLES ROAD 
AGAWAM, MASSACHUSETTS 01001-5008 
(800) 633-3800 
www.olyfast.com 
www.fastenmaster.com 
mguthrie@olyfast.com 
ADDITIONAL LISTEE: 
MITEK INDUSTRIES, INC. 
14515 NORTH OUTER FORTY, SUITE 300 
CHESTERFIELD, MISSOURI 63017 
(314) 434-1200 
www.mii.com 
EVALUATION SUBJECT: 
FASTENMASTER
®
 LOK SERIES STRUCTURAL WOOD 
SCREWS 
1.0 EVALUATION SCOPE 
Compliance with the following codes: 
 2012, 2009 and 2006 International Building Code
®
 (IBC) 
 2012, 2009 and 2006 International Residential Code
®
(IRC) 
Properties evaluated: 
 Structural 
 Corrosion resistance 
2.0 USES 
The FastenMaster LOK Series fasteners described in this 
report are alternate dowel-type threaded fasteners used for 
wood-to-wood connections. 
The FastenMaster LOK Series fasteners having a 
proprietary corrosion-resistant coating with a lubricious 
clear top coat may be used where fasteners are required to 
exhibit corrosion resistance when exposed to adverse 
environmental conditions and/or in preservative-treated 
wood (subject to the limitations of Section 5.2), and are 
alternates to hot-dip-zinc galvanized fasteners with a 
coating weight in compliance with ASTM A153, Class D. 
The fasteners have been evaluated for use with wood 
chemically treated with waterborne alkaline copper 
quaternary, type D (ACQ-D). 
3.0 DESCRIPTION 
3.1 General: 
The LOK Series fasteners described in this report are 
manufactured using a standard cold-forming process and 
are heat-treated. These fasteners depart from ANSI 
B18.2.1 and B18.6.1 in thread design, exceed the bending 
yield strengths documented in Table 5 of American Forest 
& Paper Association (AF&PA) Technical Report 12, and 
are not installed with lead holes in accordance with the 
National Design Specification for Wood Construction 
(NDS). The LOK Series fasteners recognized in this report 
are described in Sections 3.1.1 through 3.1.5. 
3.1.1 OlyLog and TimberLOK Fasteners: The OlyLog 
and TimberLOK fasteners have a 
5
/
16
-inch (7.9 mm) hex-
head, rolled threads and a gimlet point. They have a 
proprietary corrosion-resistant coating with a lubricious 
clear top coat. See Table 1A for fastener dimensions and a 
diagram. 
3.1.2 HeadLOK Fasteners: The HeadLOK fasteners 
have a proprietary #3 Spider-drive head, rolled threads and 
a gimlet point. They have a proprietary corrosion-resistant 
coating with a lubricious clear top coat. See Table 1B for 
fastener dimensions and a diagram. 
3.1.3 LedgerLOK and LogHog Fasteners: The 
LedgerLOK and LogHog fasteners have a 
5
/
16
-inch 
(7.9 mm) hex-head with integral washer, rolled threads and 
a gimlet point. They have a proprietary corrosion-resistant 
coating with a lubricious clear top coat. See Table 1C for 
fastener dimensions and a diagram. 
3.1.4 TrussLOK and TrussLOK-Z Fasteners: The 
TrussLOK and TrussLOK-Z fasteners have a 
3
/
8
-inch 
(9.5 mm) hex-head, rolled threads and proprietary cutting 
points. They have a proprietary corrosion-resistant coating 
with a lubricious clear top coat. See Tables 1D and 1E for 
fastener dimensions and a diagram. 
3.1.5 ThruLOK Fasteners: The ThruLOK fasteners have 
a 
5
/
16
-inch (7.9 mm) hex-head, rolled threads and a 
proprietary cutting point. The fasteners are coated with 
mechanically applied zinc in accordance with ASTM B695, 
Type I, Class 55. They are supplied with the ThruLOK 
washer and nut. See Table 1F for fastener dimensions and 
a diagram. 
3.2 Materials: 
The fasteners are made of carbon steel grade 1022 or 
10B21 wire, conforming to the report holder’s material 









