Stainless Steel Hex Washer Head Self Tapping Screws / Sheet Metal Screws (Type A Point) – 304 / 316 Grade – Manufacturer Direct

Premium Stainless Steel Hex Washer Head Self Tapping Screws (Sheet Metal Screws)

At Handan Bolt, we manufacture high-performance Stainless Steel Hex Washer Head Self Tapping Screws tailored for the HVAC, construction, and automotive industries. Unlike standard carbon steel screws that rust over time, our screws are produced from premium Grade 304 and 316 stainless steel wire in our Yongnian facility. They feature an integrated washer face and a sharp point, offering a secure, leak-resistant fastening solution for thin metal sheets.

What is a Hex Washer Head Screw?

This fastener combines a hexagonal drive with a built-in washer base.

• High Torque Drive: The 6-sided hex head allows you to use a socket driver or wrench. This enables you to apply significantly more torque than a Phillips or Slotted drive without the bit slipping (cam-out), which is critical when driving into metal.
• Integrated Washer: The “Washer Head” provides a larger bearing surface. This distributes the clamping pressure over a wider area, preventing the screw head from crushing thin sheet metal or pulling through the hole.

Sharp Point vs. Self-Drilling: Know the Difference

As shown in your product image, these are Self-tapping Screws (Read more on Wikipedia) with a Sharp Point (Type A).

Note: These are NOT self-drilling (Tek) screws. They require a pre-drilled pilot hole (unless the metal is very thin, like ductwork). Once inserted, the hardened stainless threads cut their own mating threads into the material, creating a zero-tolerance fit that resists loosening.

Material Grades: Ultimate Corrosion Resistance

For outdoor or humid environments, plating is not enough. You need solid stainless steel:

1. Stainless Steel 304 (A2)

The standard for general outdoor use.

• Application: Fastening aluminum siding, guttering, and HVAC ductwork.
• Benefit: Resists oxidation and maintains a clean, bright appearance for years.

2. Stainless Steel 316 (A4)

The premium choice for harsh environments.

• Application: Coastal construction, chemical plants, and food processing facilities.
• Benefit: The addition of Molybdenum provides superior resistance to chlorides and salt spray.

Standard Specifications

We manufacture to major international standards including:

• DIN 6928: Hexagon washer head tapping screws.
• ASME B18.6.3: US Standard for Type A / Type AB tapping screws.
• ISO 7053: Hexagon washer head tapping screws.

Common Applications

These screws are the “workhorse” of the sheet metal industry:

• HVAC Systems: Connecting galvanized ducts and vents.
• Metal Buildings: Stitching metal roof panels and wall cladding.
• Automotive: Securing license plates, fender liners, and plastic trim.
• Appliances: Assembly of washing machines and refrigerator panels.

Why Source from Handan Bolt?

Passivation Process: All our stainless screws undergo a chemical passivation bath to remove surface iron contaminants, maximizing their natural rust resistance.
Deep Hex Head: Our cold-heading dies are maintained to precision standards, ensuring the hex head is sharp and defined for a perfect socket fit.
Bulk Availability: We stock millions of standard sizes like #8, #10, #12 (ST4.2, ST4.8, ST5.5) for immediate shipment.

Get a Direct Factory Quote

Are you a sheet metal fabricator or a fastener wholesaler? Secure your supply chain with our high-quality stainless screws.

Need a price list for #10 x 3/4″ stainless screws?

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