DIN7971 Slotted Pan Head Tapping Screws
DIN 7971 slotted pan head tapping screws feature a rounded head with a flat bearing surface and a straight slot for screwdriver installation. The self-tapping thread allows the screw to form mating threads in suitable materials, while the pan head provides a visible, slightly raised finish after installation. This combination makes them suitable for fastening sheet metal parts, light metal components, and other assemblies where a traditional slotted drive is specified.
These screws are commonly used in metal enclosures, electrical housings, equipment panels, and general sheet metal assemblies. Their suitability depends on the thickness and properties of the base material, the required thread engagement, and the installation torque. The pan head provides a bearing surface above the component, making this head style useful where a flush finish is not required.
Specification:
| Item | Specification |
|---|---|
| Standard | DIN7971 |
| Product Type | Slotted Pan Head Tapping Screws |
| Thread Diameter | ST2.2-ST6.3 |
| Point Type | Type C/Type F |
| Thread Standard | ISO 1478 |
| Material | Carbon Steel, Stainless Steel |
| Steel Property | ISO2702 |
| Stainless Steel Property | ISO3506-4 |
| Surface Treatment | Black Oxidation,Zinc Plated,Bright Finish |
| Inspection | Dimensions,Thread,Hardness,Coating |
Dimension Chart:
| Thread Diameter | ST2.2 | ST2.9 | ST3.5 | ST3.9 | ST4.2 | ST4.8 | ST5.5 | ST6.3 |
| P | 0.8 | 1.1 | 1.3 | 1.3 | 1.4 | 1.6 | 1.8 | 1.8 |
| a max | 0.8 | 1.1 | 1.3 | 1.3 | 1.4 | 1.6 | 1.8 | 1.8 |
| dk max | 4.2 | 5.6 | 6.9 | 7.5 | 8.2 | 9.5 | 10.8 | 12.5 |
| dk min | 3.9 | 5.3 | 6.9 | 7.14 | 7.84 | 9.14 | 10.37 | 12.07 |
| k max | 1.35 | 1.75 | 2.1 | 2.25 | 2.45 | 2.8 | 3.2 | 3.65 |
| k min | 1.15 | 1.5 | 1.85 | 2 | 2.15 | 2.5 | 2.85 | 3.3 |
| n min | 0.66 | 0.86 | 1.06 | 1.06 | 1.26 | 1.26 | 1.66 | 1.66 |
| n max | 0.8 | 1 | 1.2 | 1.2 | 1.51 | 1.51 | 1.91 | 1.91 |
| r max | 0.3 | 0.4 | 0.5 | 0.5 | 0.6 | 0.7 | 0.8 | 0.9 |
| t min | 0.55 | 0.75 | 0.95 | 1.05 | 1.15 | 1.35 | 1.55 | 1.8 |
| t max | 0.8 | 1 | 1.25 | 1.4 | 1.5 | 1.7 | 1.95 | 2.2 |
- RELATED SCREW LISTS:
- Self Tapping Screw
- DIN7971 Tapping Screws
- DIN7972 Tapping Screws
- DIN7973 Slotted Tapping Screw
- DIN7976 Hex Head Self Tapping Screws
- DIN 968 Pan Head Self Tapping Screws with Collar
- DIN7982 Cross Recessed Self Tapping Screws
- DIN 7983 Raised Countersunk Tapping Screws
- ISO 14585 Torx Pan Head Self Tapping Screws
- DIN6928 Hexagon Washer Head Tapping Screws
- DIN7981 Cross Recessed Pan Head Tapping Screws
Mechanical Proeprty:
Steel DIN 7971 Tapping Screws – ISO 2702
Steel DIN 7971 tapping screws need sufficient torsional strength to withstand the torque applied during installation and form threads in the base material. Hardness and torsional performance are important factors in assessing whether the screws can be installed without premature twisting failure. ISO 2702 specifies the mechanical and physical requirements for heat-treated steel tapping screws.
Stainless Steel DIN 7971 Tapping Screws – ISO 3506-4
Stainless steel DIN 7971 tapping screws combine corrosion resistance with the mechanical performance required for thread-forming installation. Their torsional strength is particularly relevant when tightening the screws through the slotted drive. ISO 3506-4 specifies the mechanical and physical properties of corrosion-resistant stainless steel tapping screws according to the applicable material grades and requirements.