DIN 963 Slotted Countersunk Screws
DIN 963 Slotted Countersunk Screws are designed for assemblies where the fastener needs to sit within the surface while retaining a simple, traditional drive. The 90° countersunk head allows the screw to seat into a matching countersunk hole, while the straight slot provides direct access with a conventional flat-blade screwdriver. The combination is particularly useful for finished panels, covers, hardware components, light mechanical assemblies, and other parts where a raised screw head would be undesirable. Unlike cross-recessed designs, the straight slot has a very simple drive geometry and can be useful where traditional tooling or an existing product design calls for a slotted fastener.
DIN 963 screws are available in stainless steel, carbon steel, and other material options, with surface finishes selected according to the operating environment. Stainless steel can be used where corrosion resistance is important, while steel versions provide practical options for general mechanical assembly and production. When specifying DIN 963, the 90° countersink, screw length, thread size, and slot dimensions should be considered together. The countersunk hole must provide enough seating depth without unnecessarily reducing the material thickness. For applications requiring higher installation torque or frequent power-tool use, a cross-recessed or more torque-resistant drive may be a better choice.
Specification:
DIN 963 Slotted Countersunk Screws are defined by their metric thread, screw length, countersunk head dimensions, 90° head angle, slot geometry, material, and surface finish. DIN 963 is the traditional designation corresponding to ISO 2009, which specifies slotted countersunk head screws of product grade A. For steel versions, mechanical properties can be specified according to ISO 898-1, while corrosion-resistant stainless-steel versions can be specified according to ISO 3506-1. The selected material and property class should be considered together with the mating nut or threaded component.
| Parameter | Specification |
|---|---|
| Standard | DIN963 |
| Product Type | Slotted Countersunk Head Screw |
| Head Type | Countersunk Head |
| Head Angle | 90° |
| Drive | Slotted Straight Slot |
| Thread Tolerance | 6g |
| Size Rangle | M1.6-M12 |
| Material | Carbon Steel,Alloy Steel,Stainless Steel |
| Property Class | 4.8,8.8,10.9 A2-70/80 A4-70/80 |
| Mechanical Standard | ISO898-1, ISO3506-1 |
| Inspection | Dimensions,Thread,Drive,Head Angle,Mechanical Property,Coating |
Dimension Chart of DIN 963 Slotted Countersunk Screws:
| Thread Diameter | M1.6 | M2 | M2.5 | M3 | M4 | M5 | M6 | M8 | M10 | M12 |
| P | 0.35 | 0.4 | 0.45 | 0.5 | 0.7 | 0.8 | 1 | 1.25 | 1.5 | 1.75 |
| dk max | 3 | 3.8 | 4.7 | 5.6 | 7.5 | 9.2 | 11 | 14.5 | 18 | 22 |
| dk min | 2.86 | 3.5 | 4.4 | 5.3 | 7.14 | 8.84 | 10.57 | 14.07 | 17.57 | 21.48 |
| k max | 0.96 | 1.2 | 1.5 | 1.65 | 2.2 | 2.5 | 3 | 4 | 5 | 6 |
| n min | 0.46 | 0.56 | 0.66 | 0.86 | 1.06 | 1.26 | 1.66 | 2.06 | 2.56 | 3.06 |
| n max | 0.6 | 0.7 | 0.8 | 1 | 1.2 | 1.51 | 1.91 | 2.31 | 2.81 | 3.31 |
| t min | 0.32 | 0.4 | 0.5 | 0.6 | 0.8 | 1 | 1.2 | 1.6 | 2 | 2.4 |
| t max | 0.45 | 0.6 | 0.7 | 0.85 | 1.1 | 1.3 | 1.6 | 2.1 | 2.6 | 3 |
- RELATED SCREW LISTS:
- ANSI/ASME B18.3 Stainless Steel American Standard Countersunk Head Torx Screw
- ANSI/ASME B18.3 Stainless Steel Hexagon Socket Button Head Cap Screws
- ANSI/ASME B18.3F Stainless Steel Hex Socket Countersunk Head Machine Screw
- American Standard ASME/ANSI B18.3 Hexagon Socket Head Cap Screws
- ASME/ANSI B18.6.3 Cross Recessed Pan Head Machine Screws
- DIN7991 Stainless Steel Hex Socket Countersunk Head Cap Screws
- ISO7380 Stainless Steel Hexagon Socket Button Head Screws
- DIN965 Stainless Steel Cross Recessed Countersunk Head Screws
- DIN84 Stainless Steel Slotted Cheese Head Screws
- DIN7971 Stainless Steel Slotted Pan Head Tapping Screws
- DIN7981 Cross Recessed Pan Head Tapping Screws
- DIN7972 Stainless Steel Slotted Countersunk Head Tapping Screws
Application of DIN 963 Slotted Countersunk Screws:
Metal Hardware & Fabricated Parts
DIN 963 screws are suitable for metal brackets, hinges, small hardware components, fabricated parts, and sheet-metal assemblies where a recessed screw head is preferred and installation can be carried out with a conventional flat-blade screwdriver.
Machinery Components
They can be used in machine guards, covers, mechanical brackets, guide components, and small equipment assemblies where the fastener needs to remain within the component profile and the connection does not require high installation torque.
Electrical & Instrument Components
The compact countersunk design can be useful for electrical enclosures, instrument housings, control components, and mounting hardware where a clean surface and straightforward access to the fastener are desirable.
Selection Tip
DIN 963 is best selected when both the 90° countersunk head and straight-slot drive match the assembly requirements. For high-volume production or applications requiring higher tightening torque, a cross-recessed or more torque-resistant drive may be a better alternative.