🔩No.12 Pozi Flanged Self Tapping Screws - A2 Stainless Steel Tappers | HomeDIYer
Secure materials without pre-tapped threads using our premium Pozi flanged self tapping screws! These versatile No.12 self tappers feature an integrated flange head that eliminates the need for separate washers and a Pozidrive drive system for superior torque transfer. Made from corrosion-resistant A2-70 stainless steel, perfect for metal, plastic, and wood applications where durability and weather resistance are essential.
⚡All-in-One Fastening Solution: The integrated flange on these self tapping screws acts as a built-in washer, distributing pressure evenly while preventing pull-through in soft materials. No need for separate washers!
📏 No.12 Self Tapping Screw Specifications
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Integrated Flange Head
Acts as built-in washer • Eliminates separate washers • Prevents pull-through • Distributes load evenly
📊 Detailed Technical Specifications
| Specification |
Detail |
Notes |
| Screw Size |
No.12 |
Equivalent to approximately 5.5mm |
| Thread Diameter |
5.5 mm |
Major diameter of threads |
| Head Diameter |
12.8 mm |
Includes flange width |
| Head Height |
3 mm |
Low-profile design |
| Drive Type |
Pozidrive (PZ) |
Reduced cam-out design |
| Head Style |
Flanged Head |
Integrated washer function |
| Length Measurement |
Excluding Head |
Standard for self tappers |
Material: A2-70 Stainless Steel Standard: BS 4174 Drive: Pozidrive (PZ) Head: Flanged Head Type: Self Tapping Screw Finish: Untreated (Natural)
🔍 Pozidrive Drive System Advantage
PZ
Pozidrive
• Additional ribs for grip
• Reduced cam-out
• Higher torque capacity
• Less tool slippage
✨ Key Features of Flanged Self Tapping Screws
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Self-Tapping Design: These self tappers cut their own threads as they're driven, eliminating the need for pre-tapped holes.
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Integrated Flange: The built-in washer head distributes load and prevents pull-through in soft materials.
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Corrosion Resistant: A2-70 stainless steel construction provides excellent rust resistance for indoor and outdoor use.
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Superior Drive System: Pozidrive (PZ) drive reduces cam-out and allows for higher torque application.
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Time-Saving: Combines screw and washer in one component for faster installation.
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Standard Compliant: Manufactured to BS 4174 standards ensuring quality and performance.
🔧 Common Applications for Self Tapping Screws
Metal Roofing & Siding
Securing metal sheets without pre-drilling
Plastic & Composite Panels
Fastening PVC, fiberglass, or acrylic
Automotive Trim
Securing body panels and interior components
Outdoor Furniture
Weather-resistant fastening for patio sets
Electrical Enclosures
Securing junction boxes and panels
General Repairs
Quick fixes on various materials
❓ Frequently Asked Questions (FAQ)
Q: What materials can these self tapping screws be used with?
A: These No.12 self tappers work excellently with thin metals (steel, aluminum up to 2mm), plastics, wood, and composite materials. For thicker metals, pre-drilling a pilot hole is recommended. The sharp threads and Pozidrive drive make them particularly effective for sheet metal applications.
Q: Do I need to pre-drill holes for these self tapping screws?
A: For most thin materials (under 2mm), these flanged self tapping screws can often be driven without pre-drilling. For thicker materials, harder metals, or to prevent material splitting (in plastics/wood), a pilot hole slightly smaller than the screw's thread diameter is recommended for best results.
Q: What screwdriver bit do I need for Pozidrive screws?
A: You need a Pozidrive (PZ) bit, not a standard Phillips (PH) bit. While they look similar, Pozidrive has additional smaller ribs between the main slots for better grip. Using the correct PZ bit prevents damaging the screw head and allows for proper torque application on these Pozi self tapping screws.
Q: What does "No.12" mean for screw sizes?
A: "No.12" is a gauge number from the imperial numbering system, where higher numbers indicate larger diameters. A No.12 screw has approximately a 5.5mm thread diameter. These self tapping screws are commonly used in sheet metal work and are equivalent to between M5 and M6 metric sizes.
Q: Can these stainless steel screws be used outdoors?
A: Yes! The A2-70 (304) stainless steel construction makes these flanged self tappers excellent for outdoor applications. They resist rust and corrosion from weather exposure, making them ideal for roofing, siding, outdoor furniture, and other exterior projects.
Q: What's the advantage of the flanged head design?
A: The flanged head provides several benefits: 1) Acts as an integrated washer, distributing load over a larger area, 2) Prevents pull-through in soft materials, 3) Creates a weather-resistant seal, 4) Eliminates the need for separate washers, saving time and parts.
Q: Are these suitable for automotive applications?
A: Absolutely! These stainless steel self tapping screws are perfect for automotive trim, body panels, interior components, and accessories. The corrosion resistance is ideal for vehicles exposed to weather, and the self-tapping design works well with sheet metal common in automotive construction.
