HeadLOK Structural Wood Screw

HeadLOK is a heavy duty structural wood screw that is ideal for many wood applications including deck framing, stair stringers, attaching rigid foam (SIPs), fences, kitchen cabinets and more. The HeadLOK flat head fastener requires no predrilling and offers higher design shear than 3/8" lag screws. The SpiderDrive™ System contains 8 points of contact, maximizing bit fit and reducing stripping. HeadLOK zips right in and creates a great finished look.

3/8” lag screw replacement
No predrilling
Flat head provides great finished look
Sharp gimlet point for fast installation into wood and OSB
Aggressive thread for holding and withdrawal strength
Free SpiderDrive™ bit in every package

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

Videos

HeadLOK Flathead Structural Wood Screw

Learn how our HeadLOK Flathead Structural Wood Screw is ideal for fastening a variety of wood applications.

Sku Selections
Installation
Technical Docs
Related Products
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HeadLOK SKU Selection Guide
LENGTH	PACKAGING QTY	SKU
2 7/8"	12 pc clamshell	FMHLGM278-12
	50 pc box	FMHLGM278-50
	500 pc bucket	FMHLGM278-500
4 1/2"	12 pc clamshell	FMHLGM412-12
	50 pc box	FMHLGM412-50
	250 pc bucket	FMHLGM412-250
6"	12 pc clamshell	FMHLGM006-12
	50 pc box	FMHLGM006-50
	250 pc bucket	FMHLGM006-250
1 5/8"	500 pc bucket	FMHLGM158-500
3 3/4"	250 pc bucket	FMHLGM334-250
5"	250 pc bucket	FMHLGM005-250
5 1/2"	250 pc bucket	FMHLGM512-250
6 1/2"	250 pc bucket	FMHLGM612-250
7"	250 pc bucket	FMHLGM007-250
7 1/2"	250 pc bucket	FMHLGM712-250
8"	250 pc bucket	FMHLGM008-250
8 1/2"	250 pc bucket	FMHLGM812-250
9"	250 pc bucket	FMHLGM009-250
9 1/2"	250 pc bucket	FMHLGM912-250
10"	250 pc bucket	FMHLGM010-250
11"	250 pc bucket	FMHLGM011-250
12"	250 pc bucket	FMHLGM012-250
13"	250 pc bucket	FMHLGM013-250
14"	250 pc bucket	FMHLGM014-250
15"	250 pc bucket	FMHLGM015-250
16"	250 pc bucket	FMHLGM016-250
18"	250 pc bucket	FMHLGM018-250
HeadLOK Carded Bit (2 pk)		FMSPIDER3-2PK

HeadLOK should be installed using a ½" high torque drill (18V Cordless or higher), drive the HeadLOK head flush to the surface. No predrilling required when proper end and edge distances are maintained.

HeadLOK should be installed using an impact driver or high torque 1/2" variable speed drill (minimum 18V if cordless). Choose the proper length fastener so that the threads fully engage the main member (second piece). Bring the washer head flush to wood surface.

03/09/2015 3:29

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.