A
Anonymous
Apr 18, 2026
Rating: 5/5
Strong hold
Very secure fit. The hex head grips well with the socket and does not strip easily under torque.
Description
National standard hardened galvanized external hex drill tail screw for color steel roofing, self-drilling self-tapping, sizes M4.8/M5.5/M6.3
Reviews
Attributes
| Brand | - |
| Category | Industrial Small Parts / Connectors and Fasteners |
| Origin | - |
| Material | Carbon Steel |
| Surface Finish | Galvanized |
| Head Style | Hex Washer Head |
| Available Sizes | M4.8, M5.5, M6.3 |
| Thread Type | Self-Tapping |
| Point Style | Arrowhead Drill Point |
| Standard Compliance | GB Standard |
| Recommended Use | Metal Sheet & Steel Structure |
| Hardness Level | Hardened |
| Packaging | Bulk Box |
5 reviews
A
Anonymous
Mar 11, 2026
Rating: 5/5
Perfect for metal roofing
Exactly what I needed for color-coated steel. No pre-drilling required which saved a lot of time.
A
Anonymous
Mar 04, 2026
Rating: 4/5
Fast shipping
Product matches description. Use caution on thinner metals to avoid stripping the threads during install.
A
Anonymous
Mar 03, 2026
Rating: 5/5
Sharp and Durable
These screws drilled through the steel sheet effortlessly. The galvanization looks solid and should prevent rust.
A
Anonymous
Feb 14, 2026
Rating: 4/5
Good value
Works well for my project. One box had a few slightly bent heads but mostly good quality overall.
5 FAQ
Q: What drive size do I need for installation?
A: A standard hex socket matching the head size of the screw is recommended for best results.
Q: Are these screws rust resistant?
A: Yes, they are galvanized to provide corrosion resistance for outdoor applications.
Q: What sizes are included in this listing?
A: We offer M4.8, M5.5, and M6.3 options. Please select your preferred size at checkout.
Q: Is the washer integrated into the head?
A: Yes, these feature a bonded washer seal to ensure a watertight fit.
Q: Do I need to drill a pilot hole first?
A: No, these are self-drilling with an arrowhead point designed to penetrate metal directly.
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