---
product_id: 4691599
title: "FastenMaster FMHLGM412-250 HeadLOK Heavy-Duty Flathead Fastener, 4-1/2 Inches, 250-Count,Black"
brand: "fastenmaster"
price: "€ 358.92"
currency: EUR
in_stock: true
url: https://www.desertcart.sk/products/4691599-fastenmaster-fmhlgm412-250-headlok-heavy-duty-flathead-fastener-4-1
store_origin: SK
region: Slovakia
---

# 4-1/2" length for deep, secure fastening No predrilling needed – zips right in Corrosion-resistant epoxy finish, ACQ approved FastenMaster FMHLGM412-250 HeadLOK Heavy-Duty Flathead Fastener, 4-1/2 Inches, 250-Count,Black

**Brand:** fastenmaster
**Price:** € 358.92
**Availability:** ✅ In Stock

## Summary

> 🛠️ Fasten smarter, not harder — the ultimate heavy-duty screw for pros who demand more!

## Quick Answers

- **What is this?** FastenMaster FMHLGM412-250 HeadLOK Heavy-Duty Flathead Fastener, 4-1/2 Inches, 250-Count,Black by fastenmaster
- **How much does it cost?** € 358.92 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.sk](https://www.desertcart.sk/products/4691599-fastenmaster-fmhlgm412-250-headlok-heavy-duty-flathead-fastener-4-1)

## Best For

- fastenmaster enthusiasts

## Why This Product

- Trusted fastenmaster brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Built to Last:** Epoxy-coated carbon steel ensures corrosion resistance for the life of your project
- • **American Made Quality:** Crafted in the USA with precision and durability you can trust
- • **Versatile Application:** Ideal for deck framing, stair stringers, fencing, and cabinetry—perfect for any wood-to-wood task
- • **Code-Compliant Strength:** Outperforms 3/8" lag screws with superior shear values for heavy-duty projects
- • **Effortless Installation:** Patented Spider Drive virtually eliminates cam-out, saving time and frustration

## Overview

The FastenMaster FMHLGM412-250 HeadLOK is a 4-1/2 inch, black epoxy-coated flathead fastener designed for heavy-duty wood-to-wood projects. It features a patented Spider Drive to prevent cam-out, aggressive threading for no-predrill installation, and superior shear strength exceeding 3/8 inch lag screws. ACQ approved and corrosion-resistant, this 250-count pack delivers professional-grade durability and efficiency, making it a must-have for deck framing, fencing, and cabinetry.

## Description

Product Description               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.                  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.

## Features

- Nationally code compliant stronger design shear values than 3/8 inch lag screws
- No predrilling--zips right in
- Patented Spider Drive virtually eliminates cam-out
- corrosion resistance for the life of the project; ACQ approved

## Technical Specifications

| Specification | Value |
|---------------|-------|
| Material | Carbon Steel |
| Head Style | Flat |
| Exterior Finish | Epoxy |
| Thread Size | 4-1/2" |
| Point Style | Self-Drill Point |
| Metal Type | Alloy Steel |
| Brand | FASTENMASTER |
| Color | Black |
| Head Type | Flat |
| Item Weight | 10 Pounds |
| Thread Type | Fine |
| Thread Coverage | Partially Threaded |
| Fastener Type | Screw |
| Set Screw Thread Type | Fine |
| Thread Style | Right Hand |
| Thread Class | Fine |
| Fastener Size | 4 Inch - 6 1/2 Inch |
| Size | 4 Inch - 1/2 Inch |
| Item Diameter | 0.25 Inches |
| Compatible groove diameter | 0.5 Inches |
| Number of Pieces | 250 |
| UPC | 608309410355 767654837733 |
| Global Trade Identification Number | 00608309410355 |
| Manufacturer | FastenMaster |
| Part Number | OMG - 5667704 |
| Item Weight | 10 pounds |
| Item model number | FMHLGM412-250 |
| Is Discontinued By Manufacturer | No |
| Finish | black |
| Item Package Quantity | 1 |
| Cutting Diameter | 0.25 Inches |
| Measurement System | Imperial |
| Usage | wood |
| Included Components | OMG - 5667704 |
| Batteries Included? | No |
| Batteries Required? | No |
| Warranty Description | HeadLOK is fully guaranteed for the life of the project against rusting or corrosion. Fasteners are not intended for use within 1,000 feet of saltwater applications. |

## Product Details

- **Material:** Carbon Steel
- **Head Style:** Flat
- **Item dimensions L x W x H:** 9.5 x 7.5 x 10 inches
- **Exterior Finish:** Epoxy
- **Thread Size:** 4-1/2"

## Images

![FastenMaster FMHLGM412-250 HeadLOK Heavy-Duty Flathead Fastener, 4-1/2 Inches, 250-Count,Black - Image 1](https://m.media-amazon.com/images/I/514x3m5GZqL.jpg)
![FastenMaster FMHLGM412-250 HeadLOK Heavy-Duty Flathead Fastener, 4-1/2 Inches, 250-Count,Black - Image 2](https://m.media-amazon.com/images/I/61zZXR198tL.jpg)
![FastenMaster FMHLGM412-250 HeadLOK Heavy-Duty Flathead Fastener, 4-1/2 Inches, 250-Count,Black - Image 3](https://m.media-amazon.com/images/I/71kUrFrXYKL.jpg)
![FastenMaster FMHLGM412-250 HeadLOK Heavy-Duty Flathead Fastener, 4-1/2 Inches, 250-Count,Black - Image 4](https://m.media-amazon.com/images/I/61h9xz4ldDL.jpg)
![FastenMaster FMHLGM412-250 HeadLOK Heavy-Duty Flathead Fastener, 4-1/2 Inches, 250-Count,Black - Image 5](https://m.media-amazon.com/images/I/61JmLPjc06L.jpg)

## Available Options

This product comes in different **Size** options.

## Questions & Answers

**Q: We need 10” do you sell those**
A: Amazon:  I'm supposed to know your products?

**Q: What is the sheer force and bending psi specs for these?**
A: Per their spec sheet, the bending yield is 187,300 PSI and the allowable faster strength 1215 lbf Tensile and 965 lbf Shear

**Q: why do i have to buy such a large quantity ?? why can't i get the 8 inch flathead in a 50 count >???**
A: I always have big projects going. I am going to use a lot of them.

**Q: I have to put three 2x6 pressure treated together for a main beam in a crawl space under a house, will these fastners work or do you sugest another?**
A: You will only need 3" deck screws or drywall screws to put the beam together.  I would not use the head lock screw.  Probably will be 3 2x6 put together.  Stager your joints on the beam if your 2x6's are not long enough to span from baring to baring.

## Frequently Bought Together

- FastenMaster FMHLGM412-250 HeadLOK Heavy-Duty Flathead Fastener, 4-1/2 Inches, 250-Count,Black
- FastenMaster OMG-FMHLGM278-500, 2-7/8"
- EAB Tool 96000 Spider Driver Bits, 3-Pack

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*Product available on Desertcart Slovakia*
*Store origin: SK*
*Last updated: 2026-01-29*