FastenMaster FMHLGM412-50 HeadLOK Heavy-Duty Flathead Fastener, 4-1/2 Inches, 50-Count

(1844 Reviews)

Price
$41.98

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Quantity
(30000 available )

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100 Ratings
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Reviews
  • Atheist1696

    > 3 day

    I highly recommend these screws. First, they are long enough and strong enough for most (perhaps all?) household apps; cabinets, tv wall mounts, etc. Second, the star drive (included in each box) means that it is virtually impossible to strip out the head. This happens all too often with Phillips heads. The big box stores charge about $1 apiece for these in boxes of 12. Get this box of 50 and you wont regret it.

  • ronald wesley geurkink

    > 3 day

    robust, easy to fasten, should hold securely for a long time!

  • DJR

    > 3 day

    These are really excellent. I wish they were a bit cheaper. Very well made. I counted mine and they were 50 to the box.

  • Blue Lion

    > 3 day

    If you work on big boy projects, sometimes you need big boy parts, and these screws are the real deal. Bought my initial pack at Lowes as I was working on my deck.I went back when I ran out, and, of course, found out they were out of stock. When I turned to the clerk behind the Pro Service Desk for help, his reply (and I kid you not) was, Cant Help Ya Buddy and sat back down. And, big box stores wonder why people shop online. So, we ordered the screws online. They are made in the USA, and if you are needing to brace some 6 x 6 or other large deck lumber, these are going to save you time and money. I also use them on the ledger boards because they screw in flush to the board, and I can put my joist hangers over the screw if necessary. I like the fact they are thin, so they dont crack the boards, but have the strength of larger screws. And, I buy USA where I can.

  • RDG

    > 3 day

    Use these screws extensively on a deck. Biggest plus is the flat head.

  • Carl

    > 3 day

    Great fasteners. Found on Amazon and used for various heavy weight mounting projects. You can read the tech specs on the box, but I used two of these into a stud to hold 100Lbs+ of bumper plates to the wall. Includes the special bit. Drives in easy, looks clean, and the head is wide enough you probably wont need a washer.

  • Jorge Vismara

    > 3 day

    These screws are GREAT... good quality, nicely painted black, and as the head is flat, it nearly disappears once installed. They come with the Driver bit, so no need to look for one. Very happy, to the point that Im using this in various other projects.

  • Eric S.

    09-06-2025

    Awesome fasteners. So much easier than pre-drilling and driving lag screws. Ive used the related LedgerLOK screw as well.

  • Rolidnot

    Greater than one week

    I had a couple of diverse uses for these HeadLOK screw. One use was a trim application and the other a stair repair. These screws worked well for both situations. I have a 10 foot x 5/4 x 6 piece of Bubinga transition board between my tile kitchen floor and my carpeted living room. If youre not familiar with Bubinga, the pieces I have are reclaimed 40+ year old wood that is basically Brazilian Walnut, is hard as rock, easy to machine but tough on machine tools due to its high silica content. My problem was that over the 10 foot run, I could not pull the Bubinga close to the floor with standard wood screws because its too thick and the Bubinga was always squeaking and flexing. I tried shims and then floor leveler. Nothing worked. Then I used these HeadLOK lags to pull it down and they worked great. I didnt mind the “steam punk” look of the wide heads on the Bubinga - it looks sort of cool (see photo). I pre-drilled the Bubinga for the HeadLOK lags - I didnt want to split a 40 year old piece of rare hardwood. My other issue was a site built basement staircase. The stair treads were pulling away from the stringers. The HeadLOK lags worked great to pull it all back together. The one thing you need to know is that the Spider Drive bits required to drive these lags cannot be replaced with any other bit on the planet. I literally have 200 odd sized drive bits - Torx, Allen, Torx security, 1-3 square drive, Phillips JIS and every other bit you can think of but without the Spider Drive drive bit, youre unscrewed - you cant drive these bits. That sort of sucks but these bits also drive very securely, better than Torx. I can see what customers complained about the missing drive bit in some reviews because there is no substitute I am aware of - if you know of one, let me know. In the attached photo, you can see the Bubinga trim board with the HeadLOK lags in place, I used a 17mm forstner bit to recess the HeadLOK heads so they are flat to the surface and for the first time in 15+ years, the Bubinga transition board does NOT flex or squeak. Hope that helps!

  • Liam

    > 3 day

    When i saw this nail straighten out a bowed 2x4 into a stud i was seriously impressed. Ive looked all over my house to see where else i could use these they are so much fun to use. Ended up using these to attach a TV mount to a wall.

FastenMaster FMHLGM412-50 HeadLOK Heavy-Duty Flathead Fastener, 4-1/2 Inches, 50-Count

From the Manufacturer

Save time, money, and labor costs. HeadLOK eliminates the need to predrill and hand-ratchet in 3/8 inch galvanized lag screws in wood-to-wood projects. HeadLOK"s aggressive threading and sharp gimlet point allows it to zip right into wood or OSB without predrilling. 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. HeadLOK fasteners are American made.

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