DIN 7504O Cross Recessed Countersunk Head Drilling Screws
DIN 7504O Cross Recessed Countersunk Head Drilling Screws feature a flat countersunk head, a cross-shaped drive recess, and a drill point for direct fastening into suitable sheet materials. The countersunk head allows the screw to sit flush with the surrounding surface when installed in a properly prepared countersink, while the drill point helps create the entry hole during installation. This design is commonly used for sheet metal work, metal profiles, and equipment enclosures where a flush finish is required.
Our production process focuses on the accuracy of the countersunk head, cross recess, drill point, and thread profile. Cold heading forms the screw head and cross recess, while thread rolling produces the specified thread geometry. The drill point is formed to suit the required drilling performance, with material selection, heat treatment, and surface finishing controlled according to order specifications. Dimensional checks help verify critical features against the applicable product requirements.
Specification:
| Item | Specification |
|---|---|
| Standard | DIN 7504O |
| Product Type | Cross Recessed Countersunk Head Drilling Screws |
| Thread Diameter | ST2.9-ST6.3 |
| Thread Standard | ISO 1478 |
| Material | Carbon Steel, Stainless Steel |
| Mechanical Property | ISO 10666 |
| Surface Treatment | Black Oxidation,Zinc Plated,Bright Finish |
| Inspection | Dimensions,Thread,Hardness,Coating |
Dimension Chart:
| Mon | ST2.9 | ST3.5 | ST4.2 | ST4.8 | ST5.5 | ST6.3 |
| P | 1.1 | 1.3 | 1.4 | 1.6 | 1.8 | 1.8 |
| a max | 1.1 | 1.3 | 1.4 | 1.6 | 1.8 | 1.8 |
| dk max | 5.5 | 7.3 | 8.4 | 9.3 | 10.3 | 11.3 |
| dk min | 5.2 | 6.9 | 8 | 8.9 | 9.9 | 10.9 |
| k max | 1.7 | 2.35 | 2.6 | 2.8 | 3 | 3.15 |
| No. | 1 | 2 | 2 | 2 | 3 | 3 |
| M | 3.2 | 4.4 | 4.6 | 5.2 | 6.6 | 6.8 |
| t min | 1.7 | 1.9 | 2.1 | 2.7 | 2.8 | 3 |
| t max | 2.1 | 2.4 | 2.6 | 3.2 | 3.3 | 3.5 |
| dp max | 2.3 | 2.8 | 3.6 | 4.1 | 4.8 | 5.8 |
| Drilling plate thickness min | 0.7 | 0.7 | 1.75 | 1.75 | 1.75 | 2 |
| Drilling plate thickness max | 1.9 | 2.25 | 3 | 4.4 | 5.25 | 6 |
| z max | 6.25 | 6.65 | 8.7 | 9.3 | 11 |
- Related Screws
- Self Drilling Screw
- DIN 7504K Hex Washer Self Drilling Screws
- DIN 7504N Cross Recessed Pan Head Drilling Screws
- DIN 7504M Cross Recessed Pan Head Drilling Screws
- Self Tapping Screw
- ASME B18.6.3 Cross Recessed Pan Head Self Tapping Screw
- ASME B18.6.3 Phillips Hex Collar Self Tapping Screws
- ASME B18.6.3 Slotted Hex Collar Self Tapping Screw
- ASME B18.6.3 Square Slot Pan Head Self Tapping Screw
- ASME B18.6.3 Cross Recessed Truss Head Tapping Screw
- ASME B18.6.3 Slotted Pan Head Self Tapping Screw
- ASME B18.6.3 Torx Flat Head Self Tapping Screw
- ASME B18.6.3 Phillips Oval Tapping Screw
- ASME B18.6.3 Slotted Countersunk Head Self Tapping Screw
Mechanical Property:
Mechanical and Functional Requirements – ISO 10666
ISO 10666 covers the mechanical and functional properties of heat-treated drilling screws with tapping screw threads. Its requirements address surface hardness, core hardness, case depth, and torsional strength, together with the ability to drill the core hole and form the mating thread. These properties help ensure that the screw can perform its intended drilling and fastening functions without premature breakage under specified test conditions.