Round Head Self-Drilling Screws

Drive Direct into Sheet Metal.

The Wide Bearing Surface Stops Pull-Through.

Engineered to Resist Corrosion, Engineered to Last.

Round Head Self Drilling Screws | for Metal Roofing & Cladding | Sinsun

Sinsun round head self-drilling screws combine a wide bearing surface with no pre-drilling for fast, reliable sheet metal fastening. Request specs & bulk pricing.

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Product Overview

Sinsun Round Head Self-Drilling Screws are engineered for professionals who require speed, strength, and reliability in metal construction and fabrication.

The wide, round head of this fastener is combined with a hardened self-drilling point.

Without the need for a separate pre-drilling operation, the integrated drill tip penetrates steel and aluminum up to specified gauges without the need for a separate drilling operation.

The primary function of the round head (or pan head) is to provide a large bearing surface that distributes clamping force evenly.

It is designed to prevent fastener heads from pulling through thin sheet metal when loaded, vibrated, or subjected to thermal cycling.

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Stainless Steel Hex Head self drilling screw

Three-in-One Performance is the main value proposition

Self-Drilling: This method combines drilling and fastening into one step, which saves time and money.

The wide, round head of the structural clamp spreads the load well, protecting the substrate and keeping the joint strong.

Weather-Resistant: It comes with high-tech coatings that last as long as modern building materials do in bad weather.

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Why Choose Sinsun?

Factory-Direct Expertise

Our factories are directly connected from raw materials to finished products, which ensures consistent quality, competitive pricing, and reliable delivery.
Engineered for Real Demands

Our specifications are developed in consultation with industry professionals to meet the actual stresses encountered in metal roofing, cladding, and HVAC applications.
Rigorous Quality Control

Tests are conducted on all batches for hardness, coating thickness, and corrosion resistance.
Technical Support & Customization

Our engineering team can provide application guidance and support custom solutions for unique project requirements, including non-standard sizes, lengths, and coatings.

Technical Specifications

Specification	Details
Standard / Profile	Designed to common industry dimensions for round head self-drilling screws.
Material	Carbon Steel (Grade 1022A or equivalent).
Hardness	Case-hardened for optimal drill point durability and thread strength.
Drill Point & Thread	Sharp, pointed drill tip. Standard spaced tapping thread.
Head Type	Round Head (Pan Head) with bonded sealing washer option.
Drive Type	Phillips #2, Phillips #3, or Hex Washer Head.
Corrosion Protection	Standard: Zinc-Plated (Blue/White or Yellow). Premium: Zinc-Aluminum Flake Coating. Heavy-Duty: Mechanical Galvanization.
Typical Gauge Capacity	Up to 14-Gauge (2.0mm) steel, depending on screw diameter.
Common Diameters	#12 (5.5mm), #14 (6.3mm), 1/4" (6.35mm).
Common Lengths	1" (25mm) to 3" (75mm) and custom lengths.
Packaging	Bulk cartons (5,000 pcs), contractor boxes, or palletized orders.

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Primary Applications

Metal Roofing & Wall Cladding

Fastening panels to purlins and girts, especially where a wide bearing surface is needed to protect panel finish.

·Fastening panels to purlins and girts, especially where a wide bearing surface is needed to protect panel finish.
HVAC & Ductwork

Assembly of sheet metal ducts, fittings, and equipment housings.
Light-Gauge Steel Framing

Connecting steel members, brackets, and tracks in construction.
Industrial Machinery & Enclosures

Securing panels, guards, and components on metal frames.
General Sheet Metal Fabrication

Any application requiring a strong, reliable fastener that eliminates pre-drilling.

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Customer feedback

"We switched to Sinsun's round head drills for our standing seam roof projects. The time saved by skipping pre-drilling is substantial, and we've had zero issues with heads pulling through the clips. The zinc-aluminum coating looks consistent and robust."

Project Manager Commercial Roofing Contractor

"For our custom HVAC units, we need a fastener that's fast to install and won't vibrate loose. These screws do the job. The wide head sits flush and doesn't bite into the metal like some sharper-edged heads do."

Production Lead HVAC Fabrication Shop

"Ordering direct from Sinsun's factory for our large warehouse cladding project was the right decision. The technical data was clear, the quality matched the samples, and the pricing allowed us to stay competitive. We'll specify them again."

Procurement Officer Construction Firm

010203

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Request Detailed Information & Pricing

Ready to streamline your metal fastening process? Contact our team today for:

Comprehensive Technical Data Sheets (TDS)
Free Sample Kits for evaluation
Competitive Bulk Quotes tailored to your project volume
Engineering consultation for specialized applications

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