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Help CenterFactory Direct C1022A Carbon Steel Tek Screws Hex Head With EPDM Washer Yellow Zinc High Hardness Full Sizes Available
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About Our Factory-Direct C1022A Carbon Steel Tek Screws
Hefei SENOTECH New Materials Co., Ltd is a trusted trading company established in 2020, dedicated to supplying high-performance fasteners to global markets including North America, South America, Europe, Asia, Africa, and Oceania. Our factory-direct C1022A Carbon Steel Tek Screws with Hex Head and EPDM Washer are engineered for maximum durability and efficiency. Featuring yellow zinc plating and high hardness, these self-drilling screws are designed to penetrate metal substrates quickly while providing a weather-tight seal. With full sizes available, we offer versatile solutions for metal roofing, steel framing, and general construction projects.
Key Features & Technical Specifications
- Material: Premium C1022A carbon steel — ensures excellent strength and hardness after heat treatment.
- Hardness: Core hardness ≥ 52 HRC (Rockwell C) — ideal for drilling through 12–14 gauge steel.
- Surface Finish: Yellow zinc plating provides moderate corrosion resistance (salt spray test typically 48-72 hours).
- Head Type: Hex head (standard across diameters) for reliable power tool engagement.
- Integrated Washer: Pre-assembled EPDM (ethylene propylene diene monomer) rubber washer — UV resistant, waterproof, and seals against leaks.
- Self-Drilling Point: Sharp drill point reduces walking and speeds up installation — no pre-drilling needed.
- Full Size Range: Available in diameters #6, #8, #10, #12, #14 and lengths from 1/2" up to 6" (custom lengths upon request).
Mechanical & Dimensional Specifications (Typical Values)
| Parameter | Value |
|---|---|
| Tensile Strength | ≥ 1,050 MPa (after heat treatment) |
| Surface Hardness | ≥ 52 HRC |
| Case Depth | 0.1–0.3 mm |
| Zinc Coating Thickness | 4–8 µm (yellow passivation optional) |
| EPDM Washer Hardness | Shore A 70 ± 5 |
| Temperature Range | -40°C to +120°C |
Why Choose Our Tek Screws?
• Time Savings: Self-drilling design eliminates separate drilling step — drives directly into steel, wood, or composites.
• Leak-Proof Seal: The EPDM washer compresses to create a tight seal around the fastener hole, preventing water ingress.
• Consistent Quality: Every batch is inspected for hardness, thread accuracy, and plating uniformity.
• Customizable: Diameter/length combinations not listed can be produced upon request (MOQ applies).
• Cost-Effective: Factory-direct pricing reduces intermediate costs — ideal for contractors and distributors.
Trusted by Global Buyers
Since 2020, Hefei SENOTECH New Materials Co., Ltd has exported over US$1 million annually to markets spanning 5 continents, earning a reputation for reliable delivery and consistent quality. Our hex head tek screws are widely used in North American metal roof installations, South American steel structure projects, and European industrial assemblies. We maintain strict quality control and offer flexible packaging (bulk boxes, poly bags, or custom labeling). Contact us today to request a quote or samples — we are ready to support your project with full-size availability and professional service.
Frequently Asked Questions
- Q: What materials can these screws penetrate? A: They are designed for light to medium gauge steel (12–14 gauge), aluminum, and wood. For thicker steel (above 3/16"), please consult our technical team for recommendations.
- Q: Are the EPDM washers pre-assembled? A: Yes, each screw comes with a factory-fitted EPDM washer that stays in place during installation. The washer is replaceable if damaged.
- Q: What is the corrosion resistance of the yellow zinc coating? A: Yellow zinc passivation typically provides 48–72 hours of salt spray resistance under standard conditions. For higher corrosion resistance, optional clear zinc or other coatings are available upon request.
- Q: Do you offer mixed-size orders or sample packs? A: Yes, we accept mixed container orders and can provide sample packs for evaluation (freight charges apply). Minimum order quantities vary by size.
- Q: How do I choose the correct screw length? A: For metal-to-metal applications, the screw should penetrate the lower layer by at least 1/4". For wood, add material thickness plus 1/2" minimum. Our sales team can help you calculate.
- Q: Are these screws certified for structural applications? A: While our screws meet common industry manufacturing standards, we recommend verifying with local building codes. Certification documents (e.g., material test reports) can be provided upon request — but we do not claim third-party structural approvals unless specifically stated.
- Q: What packaging options are available? A: Standard packaging includes 100, 250, 500, or 1000 pieces per box. Bulk packaging (poly bags, drums) and private labeling are available on request.
- Q: How to store these screws to maintain performance? A: Keep in a dry environment (
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