Description
The Countersunk Self Tapping Self Drilling Screws are high-efficiency fasteners engineered for applications requiring a smooth, flush surface finish. Manufactured from heat-treatable 410 stainless steel, these screws possess the extreme hardness required to drill through metal substrates while maintaining the corrosion resistance of stainless steel.
Following the DIN 7504P standard, these screws feature a specialized "drill tail" (Tek point) that allows them to pierce, tap, and fasten in a single operation. They feature a flat countersunk head and cross-groove (Phillips) drive to ensure smooth installation, reliable torque transfer, and a clean, professional appearance, making them the ideal stainless steel screws for door hardware, window frames, and cabinetry where protruding screw heads are undesirable.
Features & Benefits
- High-Strength 410 Stainless Steel: Offers excellent hardness, tensile strength, and wear resistance, ensuring secure fastening performance even under high torque conditions.
- One-Step Installation: The integrated drill point allows the fastener to drill and tap simultaneously, eliminating the need for pre-drilling and separate tapping, thereby significantly increasing assembly speed and efficiency.
- Secure & Durable: The deep thread design ensures uniform force and a strong, non-slipping lock. It offers good corrosion resistance and oxidation resistance, making it suitable for both indoor and mild outdoor use.
- Slip-Resistant Drive: The standard cross groove drive ensures easy and stable installation with minimal risk of driver slippage.
Specification
|
Specification |
M2.9 |
M3.5 |
M4.2 |
M4.8 |
M5.5 |
M6.3 |
|
Pitch -p |
1.1 |
1.3 |
1.4 |
1.6 |
1.8 |
1.85 |
|
Head diameter -dk |
5.5 |
7.3 |
8.4 |
9.3 |
10.3 |
11.3 |
|
Head thickness -k |
1.7 |
2.35 |
2.6 |
2.8 |
3 |
3.15 |
FAQ:
Q1: Why use 410 stainless instead of 304 for these self-drilling screws?
A: Standard 304 stainless steel is too soft to drill through metal; the tip would melt or dull instantly. 410 stainless can be heat-treated to a high hardness, allowing these Countersunk Self Tapping Self Drilling Screws to penetrate metal surfaces effectively.
Q2: Is a pilot hole necessary?
A: No. The "drill tail" at the tip of the screw is designed to create its own hole. However, ensure your power tool is set to an appropriate RPM—too much speed can generate excessive heat and damage the drill tip.
Q3: Will the head sit perfectly flush in all materials?
A: In metal, the screw creates a slight indentation or requires a countersunk hole for a perfectly flat fit. In wood or soft plastics, the screw head will naturally pull itself flush into the material during the final tightening phase.
Q4: Are these screws rust-proof?
A: 410 stainless provides good resistance to atmospheric corrosion and humid environments. However, for maximum rust protection in chemical or high-salt coastal areas, 304 or 316 fasteners are preferred (though they typically require pre-drilling).
Q5: What materials can these screws be used on?
A: They are suitable for fastening metal, wood, and plastic materials.
