The DIN 7504-N self-drilling screw is a Phillips pan head fastener for drilling and fastening suitable sheet metal in one operation. The withdrawn DIN 7504 designation remains common in trade, while the corresponding current reference is DIN EN ISO 15481:2000-02 / ISO 15481:1999 for cross-recessed pan head drilling screws with tapping screw threads. This page focuses on the Phillips Type H drive. The screw combines a drill point, tapping thread, and rounded pan head for metal panels, electrical enclosures, HVAC assemblies, brackets, and other light-gauge metal applications.
Product Overview and Key Features
The DIN 7504-N form combines drilling, thread formation, and clamping. Its drill point creates the core hole before the tapping thread engages, reducing separate drilling operations when the material and thickness remain within the verified drilling capacity.
- Phillips pan head: Type H cross recess supports Phillips tooling and provides a practical bearing surface.
- Integrated drill point: drills the core hole before the tapping thread forms the mating thread.
- ST tapping thread: current ISO 15481 dimensions use ISO 1478 tapping screw threads.
- Size-specific drilling range: capacity varies by diameter and joint thickness.
- Production-friendly design: combines drilling and fastening in one installation sequence.
DIN 7504-N Self-Drilling Screw Specifications
Specification Overview
| Item | Specification |
|---|---|
| Trade designation | DIN 7504-N, withdrawn legacy designation |
| Current corresponding reference | DIN EN ISO 15481:2000-02 / ISO 15481:1999 |
| Product form | Cross-recessed pan head drilling screw with tapping screw thread |
| Drive covered here | Type H cross recess, Phillips |
| Current ISO thread sizes | ST2.9, ST3.5, ST4.2, ST4.8, ST5.5, ST6.3 |
| Thread reference | ISO 1478 |
| Standard material | Steel |
| Mechanical reference | ISO 10666 |
| Product grade | A |
| Common market finish | Zinc plated; other finishes by specification |
Dimensions and Thread Details
The table uses current ISO 15481 geometry. P is pitch, dk head diameter, and k head height. Listed lengths are common catalog combinations, not a continuous standard range or Flybear inventory statement.
| Thread | P (mm) | Common Lengths (mm) | dk Min-Max (mm) | k Min-Max (mm) | PH No. | Drilling Range (mm) |
|---|---|---|---|---|---|---|
| ST2.9 | 1.1 | 9.5, 13, 16, 19 | 5.30-5.60 | 2.15-2.40 | 1 | 0.70-1.90 |
| ST3.5 | 1.3 | 9.5, 13, 16, 19, 22, 25 | 6.64-7.00 | 2.35-2.60 | 2 | 0.70-2.25 |
| ST4.2 | 1.4 | 13, 16, 19, 22, 25, 32, 38 | 7.64-8.00 | 2.80-3.10 | 2 | 1.75-3.00 |
| ST4.8 | 1.6 | 13, 16, 19, 22, 25, 32, 38, 45, 50 | 9.14-9.50 | 3.40-3.70 | 2 | 1.75-4.40 |
| ST5.5 | 1.8 | 16, 19, 22, 25, 32, 38, 45, 50 | 10.57-11.00 | 3.70-4.00 | 3 | 1.75-5.25 |
| ST6.3 | 1.8 | 19, 22, 25, 32, 38, 45, 50 | 11.57-12.00 | 4.30-4.60 | 3 | 2.00-6.00 |
Legacy DIN 7504-N catalogs may also show ST3.9. Because it is not among the six preferred sizes in the current ISO table, retain ST3.9 explicitly on legacy RFQs rather than silently converting it. Length must provide sufficient penetration and thread engagement after the drill point passes through the joint.
Common Materials, Grades and Surface Finishes
Material and Grade Options
ISO 15481 specifies steel and refers mechanical and functional properties to ISO 10666. Case-hardened carbon steel, including C1022 in commercial catalogs, is a common market configuration. Stainless A2, A4, and bi-metal self-drilling screws also exist for corrosion-sensitive applications, but their drilling capability and governing requirements should be confirmed separately.
Coating and Finish Options
Plain steel and electroplated finishes to ISO 4042 are recognized. Zinc-plated blue or clear-passivated screws are common market options, while zinc-flake or other coatings may be specified by agreement. Case-hardened screws with electroplated coatings require process control for hydrogen-embrittlement risk. Confirm material, finish, and size combination during quotation.
Typical Applications and Selection Considerations
- Sheet-metal panels, covers, brackets, and light fabricated enclosures.
- HVAC ducting, rails, and equipment housings.
- Electrical cabinets, control panels, and appliance assemblies.
- Metal-to-metal fastening within the selected drill-point capacity.
Buyers can compare related products through Flybear’s sheet-metal screw RFQ guide and self-drilling screw category. Match substrate material, combined thickness, diameter, length, head clearance, Phillips bit size, coating environment, and installation tooling. Do not apply the maximum drilling range automatically to harder or substantially different materials.
Ordering and Quality Documentation
An RFQ should state DIN 7504-N or ISO 15481, ST size, nominal length, Phillips Type H drive, material, finish, quantity, substrate, and total drilling thickness. State legacy ST3.9, special drill points, stainless construction, or nonstandard coatings separately. Flybear’s quality control and inspection page lists dimensional, thread, hardness, torque, and coating inspection support; exact tests and documents should be agreed for the order.
Frequently Asked Questions
Is DIN 7504-N still a current DIN standard?
No. DIN 7504 has been withdrawn. DIN EN ISO 15481:2000-02 is the current German adoption for cross-recessed pan head drilling screws, based on ISO 15481:1999. DIN 7504-N remains widely used as a commercial description, so it can stay in the product title while current documentation references ISO 15481.
What sizes are covered by ISO 15481?
The current table covers ST2.9, ST3.5, ST4.2, ST4.8, ST5.5, and ST6.3. Drilling capacity increases with size. Legacy DIN 7504-N catalogs may include ST3.9, which should be quoted explicitly when required by an older drawing.
Does this screw require a pilot hole?
Within the verified drilling range and suitable material conditions, the drill point creates its own core hole before the tapping thread engages. Material hardness, thickness, point geometry, installation speed, and axial force still affect drilling performance.
What is the difference between Phillips and Pozidriv versions?
Phillips uses Type H cross recess, while Pozidriv uses Type Z. Driver geometry differs, so the drive should be specified in the RFQ. This product page is specifically for the Phillips Type H version.
Can stainless steel be used?
Stainless and bi-metal pan head self-drilling screws are commercially available, but they should not automatically be treated as identical to case-hardened steel versions. Confirm stainless grade, drill-point construction, substrate hardness, and verified drilling capacity before ordering.
Request a Quote for DIN 7504-N Self-Drilling Screws
For a DIN 7504-N self-drilling screw quotation, send Flybear Industrial the ST size, length, Phillips drive, material, coating, quantity, substrate, and drilling thickness. Include a drawing for legacy ST3.9 or special point geometry. Submit the requirements through the Flybear fastener RFQ page for review and quotation.
