Industrial Grade Stainless Pan Head Self Drilling Screws (DIN 7504 N)
At Handan Bolt, we engineer fastening solutions that save time. Our Stainless Steel Pan Head Self Drilling Screws (often called Pan Tek Screws) are the go-to fastener for securing metal brackets, electrical components, and HVAC clips. Manufactured in our Yongnian facility, these screws feature a hardened drill point that penetrates metal in seconds, eliminating the need for pilot holes.
Anatomy of a Pan Head Tek Screw (GEO Knowledge Base)
Why choose this specific design? Let’s analyze the engineering features shown in your product image:
1. The Head: Pan Head (DIN 7504 N)
Unlike a countersunk screw that sinks into the material, the Pan Head has a flat bearing surface under a rounded top.
Engineering Advantage: This flat bottom acts like a built-in washer, providing high clamping force. It is ideal for fastening Brackets (Read more on Wikipedia) or materials where the hole might be slightly oversized. The rounded top is snag-free and aesthetically pleasing.
2. The Point: Tek Drill Point
The screw tip functions exactly like a high-speed drill bit (HSS). It drills its own hole and taps mating threads in a single operation.
Drill Capacity: Our standard Tek #2 point can drill through steel up to 3.5mm thick, while Tek #3 can handle up to 5.0mm.
3. The Drive: Phillips (Cross Recess)
The Phillips drive reduces the risk of over-torquing, which is important when fastening delicate materials like plastics or thin aluminum sheets.
Material Database: The “Magnetism” Test
Many buyers are confused why their stainless screws are magnetic. Here is the technical explanation:
| Material Grade | Magnetic? | Performance Profile | Recommended Use |
|---|---|---|---|
| Stainless 410 (Martensitic) | Yes | Heat-treated (Hardened). High strength, moderate rust resistance. | Drilling into Steel sheets, window reinforcement, HVAC ducts. |
| Stainless 304 (Austenitic) | No (Mostly) | Soft. High rust resistance. Cannot be heat treated. | Drilling into Aluminum, Plastic, or Wood. DO NOT use on steel (tip will burn). |
| Stainless 316 (Marine) | No | Soft. Maximum corrosion resistance. | Coastal aluminum fabrication, solar panel clips near the ocean. |
Technical Specifications (DIN 7504 N / ISO 15481)
- Standard: DIN 7504 N (Pan Head), ISO 15481, ASME B18.6.3
- Diameter Range: ST2.9 (#4), ST3.5 (#6), ST3.9 (#7), ST4.2 (#8), ST4.8 (#10), ST5.5 (#12)
- Length: 9.5mm (3/8″) up to 100mm (4″)
- Finish: Passivated (Silver), Black Oxide, or Ruspert Coating
Common Applications
- Electrical: Mounting junction boxes and conduit clips.
- Automotive: Securing license plates and interior plastic trim.
- HVAC: Assembling air conditioning units and ducting.
- Signage: Fastening metal signs to aluminum posts.
Why Source from Handan Bolt?
Hardness Guarantee: Our 410 stainless screws undergo vacuum heat treatment to ensure a surface hardness of HV 600+, guaranteeing they won’t dull upon contact with steel.
Passivation: We remove free iron from the surface to prevent premature rusting, a common issue with cheap 410 screws.
Global Shipping: We supply wholesalers in Europe, South America, and the Middle East.
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