DIN7973 Slotted Raised Countersunk Head Tapping Screws
DIN 7973 slotted raised countersunk head tapping screws feature a straight slot drive and a raised countersunk head with a slightly rounded upper profile. The countersunk underside allows the screw to sit in a suitably prepared countersunk hole, while the raised head provides a finished appearance after installation. These screws are used in assemblies where a traditional slotted drive and a raised countersunk head design are required.
We supply DIN 7973 slotted raised countersunk head tapping screws in various sizes, with carbon steel and stainless steel options available. Different surface finishes, including zinc plating and other protective coatings, can be selected according to application requirements. When choosing the appropriate screw, thread size, length, head dimensions, material grade, and corrosion resistance should be considered to ensure compatibility with the intended assembly.
Specification:
| Item | Specification |
|---|---|
| Standard | DIN7973 |
| Size Range | ST2.2-ST6.3 |
| Product Name | Slotted Raised Countersunk Head Tapping Screws |
| Point Type | Type C/Type F |
| Thread Standard | ISO 1478 |
| Material | Carbon Steel, Stainless Steel |
| Surface Treatment | Black Oxidation,Zinc Plated,Bright Finish |
| Inspection | Dimensions,Thread,Hardness,Coating |
- RELATED SCREW LISTS:
- Self Tapping Screw
- DIN7971 Tapping Screws
- DIN7972 Tapping Screws
- 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
Dimension Chart:
| Mon | 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 | 4.3 | 5.5 | 6.8 | 7.5 | 8.1 | 9.5 | 10.8 | 12.4 |
| dk min | 4 | 5.2 | 6.44 | 7.14 | 7.74 | 9.14 | 10.37 | 11.97 |
| f | 0.7 | 0.9 | 1.2 | 1.3 | 1.4 | 1.5 | 1.7 | 2 |
| k | 1.3 | 1.7 | 2.1 | 2.3 | 2.5 | 3 | 3.4 | 3.8 |
| 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 |
| t min | 0.95 | 1.25 | 1.55 | 1.7 | 1.85 | 2.15 | 2.45 | 2.85 |
| t max | 1.15 | 1.5 | 1.9 | 2.05 | 2.25 | 2.6 | 2.95 | 3.45 |
Mechanical Property:
ISO 2702 – Mechanical Properties of Steel Tapping Screws
ISO 2702 specifies the mechanical and physical properties of heat-treated steel tapping screws. Key requirements include core hardness, surface hardness, and minimum torsional strength. These properties help evaluate the screws’ resistance to torsional failure during installation and their ability to form threads in the mating material.
ISO 3506-4 – Mechanical Properties of Stainless Steel Tapping Screws
ISO 3506-4 specifies the mechanical and physical properties of stainless steel tapping screws according to their stainless steel grades and applicable hardness classes. Core hardness, torsional strength, and thread-forming performance are important parameters for evaluating screw performance and suitability for different fastening applications.