ST Fastening Maxx SteelBinder #12 x 1 Galvanized Screws with EPDM

In this review of the ST Fastening Maxx SteelBinder #12 x 1 galvanized screws, the bottom line is clear: they are aimed at contractors and DIYers who need a reliable fastener for metal roofing and siding that balances sealing performance with long-term finish durability. The standout reason to buy is the combination of a hybrid self-drilling point for confident penetration of multilayer metal plus a cupped head that preserves the EPDM washer seal at angles, which together reduce callbacks from leaks and loose panels.

Key Features

• Hybrid self-drilling point: The combination 2- and 3-point design delivers quick, stable penetration into multilayers so the screw is less likely to wander during installation.
• MAXX self drill head: The HWH cupped head geometry helps maintain a positive seal at varied angles while shielding the EPDM washer from direct UV exposure.
• #12 carbon steel construction: Sized and specified for metal roof and sidewall panels used in pre-engineered metal building applications for appropriate shear and pull-out strength.
• EPDM washer retention: The head and washer face capture the washer even when driven at an angle, maximizing pull-over strength and maintaining the seal.
• Powderful corrosion defense: The fade-resistant Powderful coating outperforms wet paint to keep the finish matched to panels for decades.

Who It's For

The ST Fastening Maxx SteelBinder screws are best for professional roofers, builders of pole barns and pre-engineered metal buildings, and experienced homeowners doing metal siding or roofing where a reliable seal and long-lasting finish matter. They are especially useful when installers commonly work with stacked or overlapped panels and need a fastener that drills consistently into multiple layers.

These screws may be less suitable for applications requiring stainless steel fasteners or where absolute perfection in drill accuracy is critical; some customers reported a small percentage of screws that did not self-drill as expected, so buyers who need flawless drilling performance on thin gauge metal without any pre-drilling should test a sample batch first.

Pros & Cons

Pros

• Strong hybrid drilling point that reduces point walking and eases installation through multilayer panels.
• Cupped HWH head and EPDM washer design provide a positive seal even when driven at an angle.
• Durable Powderful coating that resists fading and helps maintain a matched appearance over time.

Cons

• Some users report about 5-10% of screws may not drill properly, so quality can vary by box.
• Carbon steel requires the coating for corrosion resistance; for highly corrosive environments, stainless fasteners may be preferred.

Specifications

Brand	ST Fastening
Size	#12 x 1 in
Count	250 per box
Point type	Hybrid self-drilling 2- and 3-point design
Head and washer	HWH cupped head with EPDM rubber washer
Material and finish	Carbon steel with Powderful galvanized coating

Our Verdict

These screws are a solid value for anyone installing metal roofing or siding who needs a durable seal and long-lasting finish. The hybrid self-drilling point and cupped head with EPDM washer address real installation challenges, though a small fraction of fasteners can show drill accuracy issues. For the price and intended applications, they are a reliable choice for most pole barn and pre-engineered building work.

Frequently Asked Questions

Will these screws work on 26 gauge panels?
Yes; customers report they work well on 26 gauge panels, but testing a few from the box first is wise to confirm drill performance.

Do the EPDM washers seal if the screw is not perfectly perpendicular?
Yes; the HWH cupped head and washer face are designed to capture and seal the EPDM washer even when driven at an angle.

Are they suitable for coastal installations?
The Powderful galvanized coating provides strong corrosion defense, but for harsh coastal environments, stainless fasteners may be a better long-term choice.