FastenMaster HeadLok 4-1/2 in. Heavy Duty Flathead Fastener (50-Box)-FMHLGM412-50 at The Home Depot


Model # FMHLGM412-50

Internet # 202268258

Store SKU # 519367

HeadLok 4-1/2 in. Heavy Duty Flathead Fastener (50-Box)

FastenMaster HeadLok 4-1/2 in. Heavy Duty Flathead Fastener (50-Box)

This item has been discontinued.
The Home Depot no longer carries this specific product.

$28.49 / each


Model # FMHLGM412-50

Internet # 202268258

Store SKU # 519367

Store SO SKU # 336802

Save time, money and labor costs. HeadLok eliminates the need to predrill and hand-ratchet in 3/8 in. galvanized lag screws in wood-to-wood projects. HeadLoks aggressive threading and sharp gimlet point allows it to zip right into wood or OSB without pre-drilling. Plus, the wafer head eliminates the need for washers and offers increased pull through strength. Perfect for deck framing, stair stringers, fencing, cabinets, and more! Sizes are perfect for virtually any dimensional wood-to-wood project.

  • Nationally code compliant; stronger design shear values than 3/8 in. lag screws
  • No pre-drilling; zip right in
  • Patented spider drive virtually eliminates cam-out
  • Guaranteed corrosion resistance for the life of the project; ACQ approved
  • Free spider drive bit in every package
  • American made

Info & Guides

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Assembled Depth (in.)  .189 in  Assembled Height (in.)  4.5 in 
Assembled Width (in.)  .189 in  Drive Style  Star 
Driver bit included  Yes  Fastener Callout Size  4 1/2" 
Fastener Thread Type  Coarse  Fastener Type  Wood Screw 
Finish  Black  Finish Family  Black 
Head Style  Flat  Indoor/Outdoor  Indoor/Outdoor 
Manufacturer Warranty  FastenMaster fully guarantees HeadLok against rusting or streaking for the lifetime of the project. Please see the following link for further details at:  Measurement Standard  SAE 
Package Quantity  50  Primary Use  Wood-to-wood construction i.e. decking, cabinets, stair stringers, SIP pannels, and more! 
Product Weight (lb.)  2.35 lb  Returnable  90-Day 
Screw Length  4-1/2 in  Self drilling  Yes 
Self tapping  Yes  Size  5/8 in 
Tamper Resistant  No 


Rated 4.3 out of 5 by 3 reviewers.
Rated 5 out of 5 by Super screws home depot had these screws cheaper than anyone else online. these scews are excellent for all application that supper hold is needed and isnt seen or cosmetic isnt a issue they have large heads they are stronger than most lag bolts easily installed with my 14v cordless May 2, 2011
Rated 3 out of 5 by great screw, lousy bits I love the screws. They drive easily into PT timbers with impact drivers. The bits however are way too soft and self-destruct very easily. I went through 13 spider bits for only 150 screws. So if you buy a bucket load of screws, be prepared to buy all of the spider bits available in the store. I used two impact drivers for this particular job. The first was a Milwaukee 2563 cordless impact driver with 3 torque setting options. To drive the 4.5 inch screw, the most powerful setting was needed. It would come close to flush driving the screws in PT timbers and boards. The only problem was the battery would die after only a dozen screws. So I don't recommend using that tool with this size screw. The second impact driver was a Porter Cable 120v driver. It had no problem power wise and would easily drive the screws. The only concern is it does not have any torque setting options. So you have to be careful when driving to stop before the head gets close to being set how you like or need it to be. I'm looking for a 120v impact driver with torque settings. That or another cordless impact driver with torque settings and more power or larger battery capacity. Again, love the screws, hate the spider bits. June 22, 2013
Rated 5 out of 5 by This product is versatile, strong and virtually invisible The HeadLok line of fasteners from Fastenmaster provides utility and ease of use. We use them all over for decks, railings and shade structures. August 21, 2013
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