Self-Drilling Screws (TEK)

Self-Drilling Screws (TEK) — Drill Point Sheet Metal Screws | ST4.2–ST6.3 | No Pre-Drill Required

Self-drilling screws (commonly known as TEK screws) feature an integrated drill bit point that eliminates the need for pre-drilling pilot holes. These innovative fasteners drill, tap, and fasten in a single operation, dramatically reducing installation time in metal-to-metal connections. Available in ST4.2 to ST6.3 sizes with various head styles, our self-drilling screws are engineered for roofing, cladding, and steel framing applications.

Material & Specifications

Size Range	ST4.2 to ST6.3 (#8 to #14)
Standard	DIN 7504, ANSI B18.6.4, AS 3566
Material	Carbon Steel (Case Hardened), 410 SS, 304 SS
Surface / Coating	Zinc Plated (Cr3+ RoHS), Ceramic Coated, Ruspert Coated, Dacromet
Drill Point	#1 (up to 2mm steel), #2 (up to 3mm), #3 (up to 5mm), #4 (up to 6mm), #5 (up to 12mm)
Head Type	Hex washer head, pan head, countersunk head

Surface Treatment & Zinc Coating Quality

At BoltNutsPlus, we understand that surface treatment is critical to fastener longevity and performance. Our products undergo rigorous coating processes to ensure maximum corrosion resistance and durability. We offer five premium coating options, each tested to international standards:

• Hot-Dip Galvanizing (HDG) — Thick zinc layer (50-120μm) providing superior long-term corrosion protection for outdoor, marine, and industrial environments. Compliant with ISO 1461 / ASTM A153 standards. Salt spray resistance: 500-1,000+ hours. Ideal for structural steel assemblies exposed to harsh weather.
• Electroplated Zinc Blue-White (Zn Blue/White) — Bright, clean silver-blue appearance with 5-15μm zinc layer. Cr3+ passivation technology, fully RoHS compliant. Ideal for indoor machinery, electronics, and general-purpose applications requiring aesthetic appeal and moderate corrosion resistance.
• Color Zinc / Yellow Zinc (Iridescent Passivation) — Multi-colored iridescent passivation film offering enhanced corrosion resistance (100-200 hours salt spray) with a distinctive golden finish. Widely preferred in automotive, agricultural equipment, and construction machinery sectors for its balanced protection and visual appeal.
• Dacromet Coating — Advanced water-based zinc-chromium coating technology with NO hydrogen embrittlement risk. Provides 1,000+ hours salt spray resistance, making it the preferred choice for high-strength fasteners in extreme environments. Environmentally friendly (no heavy metal discharge), RoHS/ELV compliant, ideal for automotive and wind energy applications.
• Multi-Element Alloy Co-Permeation — Zinc-aluminum-rare earth alloy layer offering 2-3x the corrosion resistance of traditional galvanizing. Features self-healing properties at scratch points, ensuring long-term protection even in damaged areas. Ideal for critical infrastructure, power transmission towers, coastal projects, and marine installations.

Key Features

• Integrated drill point eliminates pre-drilling — drills, taps, and fastens in one step
• EPDM bonded washer option provides weather-tight seal for roofing applications
• Multiple drill point sizes for different steel thicknesses (0.5mm to 12mm)
• Case-hardened carbon steel for superior drilling and tapping performance
• Ceramic/Ruspert coating options for extended outdoor corrosion resistance
• Compatible with standard hex driver bits for power tool installation

Applications

• Metal roofing and wall cladding installation
• Steel framing and stud-to-structural connections
• Solar panel racking and mounting systems
• HVAC ductwork and sheet metal assembly
• Agricultural building and shed construction
• General construction requiring fast metal-to-metal fastening

Why Choose BoltNutsPlus?

• ISO 9001:2015 Certified Manufacturing — consistent quality you can trust on every batch
• 15+ Years of Export Experience — serving 40+ countries across 6 continents
• Full Traceability — material certificates (EN 10204 3.1) and comprehensive test reports included
• Custom Packaging & OEM/ODM — your brand identity, your specifications, our precision manufacturing
• Third-Party SGS / Bureau Veritas Inspection Available upon request
• 24-Hour Quote Response — same-day reply for urgent requirements; standard 24-hour turnaround