Zinc palted & Yellow Galvanized Self Tapping Screws

Sinsun: Leading Factory & Premium Supplier of Galvanized Self-Tapping Screws

As a top manufacturer, Sinsun supplies high-quality hot-dip galvanized self-tapping screws with superior corrosion resistance for construction & metalwork. Factory-direct quality & custom solutions. Request quotes & samples.

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Self-Tapping Slash Point Hex Head Screws

Yellow Galvanized Hex Head Self Tapping Screws

Stainless Steel Hex Head self drilling screw

Zinc Plated Phillips Drive Self Tapping Screw

Product Overview: Galvanized Self Tapping Screw

Sinsun Galvanized Self-Tapping Screws feature durable and reliable fastening in challenging environments.

The screws are made of carbon steel with a zinc coating that protects them from rust and corrosion.

This zinc coating is typically applied through electro-galvanizing or hot-dip galvanizing processes.

Their unique design allows them to tap into their own threads and eliminate the need for predrilled holes.

This significantly speeds up installation in construction, agriculture, and general industrial settings.

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Sinsun zinc self tapping screws & Manufacturing Features

Controlled Corrosion Protection

For long-lasting and predictable outdoor performance, we galvanize using a standard hot-dip galvanizing process.
Engineered for Strength

Grade 1022A or higher carbon steel screws undergo precise heat treatment to achieve a core hardness of 38-45 HRC, balancing toughness and driving ability.
Factory-Direct Quality Assurance

Sinsun is a fully integrated manufacturer, ensuring dimensional accuracy, coating uniformity, and batch-to-batch consistency in a manufacturing process based on ISO 9001.

Galvanized Self Tapping Screw Technical Specifications

Feature	Specification
Material	High-carbon steel, heat-treated for strength
Coating	Hot-dip galvanized (min. 50μm coating thickness)
Drive Type	Phillips, Pozidriv, or hex washer head
Point Type	Self-drilling (Tek), self-tapping, or sharp point
Sizes	#6 to #12" diameter, 12mm to 150mm length
Standards	ASTM B633, ISO 4042, DIN 267

Why Choose Sinsun Self Drilling Screws Galvanized?

1.Corrosion Protection: Our hot-dip galvanized coating provides a long-lasting service life in humid, wet, and outdoor applications.

2.High Load Capacity: Manufactured from hardened steel to ensure reliable shear and tensile strength.

3.Reduced Installation Time: Self-drilling points eliminate the need for pre-drilling, cutting labor costs.

4.Batch Consistency: Rigorous quality control ensures uniform coating and dimensional accuracy.

5.Technical Support & Customization: We provide engineering guidance and can customize lengths, heads, and drives.

Primary Applications of drilling screws galvanized?

Galvanized self-tapping screws are flexible and cost-effective when you need something that will resist rust and last for a long time. The zinc coating on these screws protects the steel underneath from rust and oxidation.They are particularly important for projects in humid or wet environments, or for projects where uncoated fasteners would quickly corrode.

Construction & Metal Framing：

Fastening corrugated steel sheets for roofing and siding, attaching steel studs and tracks in drywall systems, and assembling light structural frames.

Agriculture & Fencing：

Constructing and repairing agricultural buildings, equipment, and installing wire mesh fencing or animal enclosures that endure outdoor exposure.

Warehouse & Storage Systems：

Securing pallet racking, industrial shelving, and mezzanine platforms where strength and moderate rust resistance are needed.

General Manufacturing & Fabrication：

Joining sheet metal components in HVAC ductwork, electrical enclosures, machinery guards, and general metal fabrication where a protective finish is beneficial.

Primary Applications of Galvanized Self-Tapping Screws

Frequently Asked Questions (FAQ)

1

Q: What is the difference between hot-dip galvanized and electro-galvanized self-tapping screws?

A: The core difference lies in coating thickness and durability. Hot-dip galvanized screws are dipped in molten zinc, creating a thick, durable layer (50-150 µm) for superior long-term outdoor protection. Electro-galvanized screws use an electrochemical process for a thinner, smoother layer (5-25 µm), making them ideal for indoor use or where a neat aesthetic is prioritized over heavy-duty corrosion resistance.
2

Q: Can galvanized self-tapping screws be used with pressure-treated wood?

A: Yes, but selection is critical. Modern ACQ or CA treated woods are highly corrosive. Standard electro-galvanized screws may fail quickly. Hot-dip galvanized screws with a thick coating are the minimum recommended specification. For maximum longevity in direct contact with treated lumber, screws with an additional polymer barrier coating are often advised to prevent chemical reaction with the wood preservatives.
3

Q: How does the galvanized coating affect the screw's drilling performance?

A: The zinc coating does not negatively impact drilling; in many cases, it provides slight lubricity during the initial drive. The drilling speed and penetration depend entirely on the hardened Tek point classification. Our screws feature a precisely engineered drill tip that maintains its integrity through the coating process, ensuring effective penetration into steel substrates.
4

Q: What is the expected service life of hot-dip galvanized screws in outdoor applications?

A: Service life depends on the ISO 12944 corrosivity category. In standard atmospheric environments (C2-C3), a quality 85 µm hot-dip galvanized coating can provide 15 to 25 years of service. In aggressive coastal (C4) or industrial environments, the lifespan will be shorter. We recommend consulting our technical charts to match the coating thickness to your specific site conditions.
5

Q: Is it necessary to use a sealing washer with galvanized roofing screws?

A: Absolutely. While the galvanized coating protects the metal fastener, it cannot seal the entry hole. An EPDM rubber sealing washer is essential for all roofing applications. It compresses under the head to form a watertight gasket, preventing moisture from reaching the internal threads or the building interior, which is critical for preventing structural rot and leaks.

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