DIN7981 Cross Recessed Pan Head Tapping Screws
DIN 7981 pan head self-tapping screws feature a rounded head with a cross-shaped recess, providing a practical fastening solution for sheet metal, plastic components, and other materials suitable for self-tapping threads. The pan head offers a relatively wide bearing surface, while the cross recess allows installation with a compatible screwdriver or power tool. These screws are available in different diameters and lengths to accommodate various assembly requirements.
The main dimensions of DIN 7981 screws include thread diameter, thread pitch, head diameter, head height, and cross recess size. Common metric thread sizes include ST2.2, ST2.9, ST3.5, ST3.9, ST4.2, ST4.8, ST5.5, and ST6.3. Material selection, surface finish, and screw dimensions should be considered according to the base material, installation conditions, and corrosion resistance requirements of the application.
Specification:
The specification of DIN7981 Cross Recessed Pan Head Tapping Screws Supplier include the following details:
| Item | Specification |
|---|---|
| Standard | DIN7981 |
| Product Type | Cross Recessed Pan Head Self-Tapping Screws |
| Size Range | ST2.2-ST6.3 |
| 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 |
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 | 1.6 | 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 | 6.54 | 7.14 | 7.84 | 9.14 | 10.37 | 12.07 |
| k max | 1.8 | 2.2 | 2.6 | 2.8 | 3.05 | 3.55 | 3.95 | 4.55 |
| k min | 1.55 | 1.95 | 2.35 | 2.55 | 2.75 | 3.25 | 3.65 | 4.25 |
| r max | 0.3 | 0.4 | 0.5 | 0.5 | 0.6 | 0.7 | 0.8 | 0.9 |
| No. | 1 | 1 | 2 | 2 | 2 | 2 | 3 | 3 |
| M | 2.6 | 3 | 4.2 | 4.4 | 4.6 | 5 | 6.5 | 7.1 |
| t min | 0.86 | 1.35 | 1.4 | 1.63 | 1.8 | 2.26 | 2.49 | 3 |
| t max | 1.32 | 1.8 | 2.03 | 2.26 | 2.46 | 2.87 | 3.15 | 3.66 |
- 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
Mechanical Property:
ISO 2702 — Mechanical Properties of Steel Tapping Screws
ISO 2702 specifies the mechanical and physical properties of heat-treated steel tapping screws with thread sizes from ST2.2 to ST9.5, in accordance with ISO 1478. The requirements cover the performance of the screw body and threads during installation, helping ensure that the screws can form mating threads in sheet metal without deforming their own threads. Mechanical testing is used to evaluate properties such as hardness and resistance to torsional failure. The table below presents the applicable mechanical property requirements for steel tapping screws.
ISO 3506-4 — Mechanical Properties of Stainless Steel Tapping Screws
ISO 3506-4 specifies the mechanical and physical properties of tapping screws manufactured from corrosion-resistant stainless steel. The 2025 edition covers austenitic, martensitic, ferritic, and duplex stainless steel grades, with specified grades and hardness classes. Mechanical performance requirements include core hardness, surface hardness for applicable martensitic grades, torsional strength, and thread-forming ability. The required properties depend on the stainless steel grade and hardness class, as shown in the table below.