DIN 963 Slotted Countersunk (CSK) Machine Screw Technical Datasheet
DIN 963 Slotted Countersunk Head Machine Screw (Flat Head Slotted Screw)
The DIN 963 Slotted Countersunk Head Machine Screw is a 90° flat head machine screw featuring a traditional slotted drive. It is designed to sit flush with the surface after installation, providing a smooth, unobtrusive finish suitable for machinery, electrical equipment, furniture, instrumentation, and general engineering assemblies.
Manufactured in accordance with DIN 963, these screws are available in a wide range of thread sizes, materials, and finishes to suit both indoor and corrosive environments.
Table of Contents
ITEM CODE: 1025
Standards
| Standard | Status |
|---|---|
| DIN 965 | Original Standard |
| ISO 2009 | ISO Equivalent |
Dimensions
| d1 | M1.6 | M2 | M2.5 | M3 | M4 | M5 | M6 | M8 | M10 |
|---|---|---|---|---|---|---|---|---|---|
| d2 | 3 | 3.8 | 4.7 | 5.6 | 7.5 | 9.2 | 11 | 14.5 | 18 |
| k max | 0.96 | 1.2 | 1.5 | 1.65 | 2.2 | 2.5 | 3 | 4 | 5 |
| n | 0.4 | 0.5 | 0.6 | 0.8 | 1.2 | 1.2 | 1.6 | 2 | 2.5 |
all dimensions in mm
Dimensions Tolerances:
General dimensional tolerances for standard metric fasteners—including thread diameter, overall length, head diameter, head height/thickness, across flats, and washer dimensions—are available in our Standard Dimensional Tolerances for Common Metric Fasteners guide.
Certain product-specific features, such as drive recess dimensions, socket depth, countersink geometry, under-head radii, and other special characteristics, are governed by the applicable DIN or ISO product standard and may not included in this datasheet.
Download Technical Datasheets
Stainless Steel
| Grade | Download |
|---|---|
| A2-70 (SS304) | ⬇️ Download Datasheet |
| A4-70 (SS316) | ⬇️ Download Datasheet |
Carbon Steel
| Property Class | Download |
|---|---|
| 4.8 | ⬇️ Download Datasheet |
| 8.8 | ⬇️ Download Datasheet |
Mechanical Properties
| Material / Property Class | Tensile Strength | Yield Strength | Standard |
|---|---|---|---|
| Steel 4.8 | ≥ 400 MPa | ≥ 320 MPa | ISO 898-1 |
| Steel 8.8 | ≥ 800 MPa | ≥ 640 MPa | ISO 898-1 |
| Stainless Steel A2-70 | ≥ 700 MPa | ≥ 450 MPa | ISO 3506-1 |
| Stainless Steel A4-70 | ≥ 700 MPa | ≥ 450 MPa | ISO 3506-1 |
| Titanium Grade 2 | Approx. 345 MPa | Approx. 275 MPa | ASTM B348 |
| Titanium Grade 5 | Approx. 895 MPa | Approx. 828 MPa | ASTM B348 |
Material Characteristics and Recommended Applications
| Material | Characteristics | Typical Applications |
|---|---|---|
| Steel Class 4.8 | General-purpose fastening | Electrical assemblies, furniture |
| Steel Class 8.8 | Higher tensile strength | Industrial machinery |
| Stainless Steel A2 (304) | Excellent corrosion resistance | Food processing, HVAC, electrical panels |
| Stainless Steel A4 (316) | Superior corrosion resistance | Marine, offshore, chemical plants |
| Brass | Non-magnetic, decorative, conductive | Electrical equipment, instrumentation |
| Titanium Grade 2 | Lightweight, corrosion resistant | Aerospace, medical equipment |
| Titanium Grade 5 | High strength-to-weight ratio | Aerospace, motorsports, high-performance engineering |
Technical Specifications
| Property | Specification |
|---|---|
| Product Name | Slotted Countersunk Head Machine Screw |
| Standard | DIN 963 |
| Head Style | Countersunk (Flat Head) |
| Head Angle | 90° |
| Drive Type | Slotted |
| Thread Type | Metric Coarse |
| Thread Direction | Right-hand |
| Thread Standard | ISO Metric |
| Thread Tolerance | 6g |
| Sizes Available | M1.6 – M10 |
| Length Range | 3 mm – 100 mm (depending on diameter) |
| Manufacturing Process | Cold Forged / Machined |
| Surface Finish | Plain, Zinc Plated, Yellow Zinc, Black Oxide, Nickel, Passivated |
| Corrosion Resistance | Depends on material and finish |
| RoHS Compliance | Available |
| REACH Compliance | Available |
DIN 963 CSK Slotted Head Screw Weight Chart
Weight in kgs. per 1,000 pcs. All weights are approximations.
| Diameter/ Length | M1.6 | M2 | M2.5 | M3 | M4 | M5 | M6 | M8 | M10 |
|---|---|---|---|---|---|---|---|---|---|
| 2 | 0.046 | ||||||||
| 3 | 0.058 | 0.1 | 0.175 | ||||||
| 4 | 0.069 | 0.119 | 0.206 | 0.29 | |||||
| 5 | 0.081 | 0.137 | 0.236 | 0.335 | 0.676 | ||||
| 6 | 0.093 | 0.156 | 0.266 | 0.379 | 0.754 | 1.21 | |||
| 8 | 0.116 | 0.193 | 0.326 | 0.467 | 0.91 | 1.45 | 2.19 | ||
| 10 | 0.139 | 0.231 | 0.386 | 0.555 | 1.06 | 1.7 | 2.54 | 5.03 | |
| 12 | 0.268 | 0.446 | 0.643 | 1.22 | 1.95 | 2.89 | 5.67 | 9.59 | |
| 14 | 0.306 | 0.507 | 0.731 | 1.37 | 2.19 | 3.25 | 6.3 | 10.6 | |
| 16 | 0.343 | 0.567 | 0.82 | 1.53 | 2.44 | 3.6 | 6.94 | 11.6 | |
| 18 | 0.381 | 0.627 | 0.908 | 1.68 | 2.69 | 3.95 | 7.57 | 12.6 | |
| 20 | 0.687 | 0.996 | 1.84 | 2.94 | 4.31 | 8.21 | 13.6 | ||
| 22 | 0.747 | 1.08 | 1.99 | 3.18 | 4.66 | 8.84 | 14.6 | ||
| 25 | 0.838 | 1.22 | 2.22 | 3.55 | 5.19 | 9.79 | 16.1 | ||
| 28 | 1.35 | 2.46 | 3.93 | 5.72 | 10.7 | 17.6 | |||
| 30 | 1.44 | 2.61 | 4.16 | 6.08 | 11.4 | 18.6 | |||
| 35 | 3 | 4.65 | 6.96 | 13 | 21.1 | ||||
| 40 | 3.38 | 5.4 | 7.84 | 14.6 | 23.6 | ||||
| 45 | 6.02 | 8.73 | 16.2 | 26.1 | |||||
| 50 | 6.65 | 9.61 | 17.8 | 28.6 | |||||
| 55 | 19.4 | 31.1 | |||||||
| 60 | 33.7 |
Applications
DIN 965 CSK Pozidriv Screws are commonly used in:
- Electrical control panels
- Sheet metal fabrication
- Industrial machinery
- Furniture manufacturing
- Automotive interiors
- Instrumentation
- Electronics enclosures
- Medical equipment
- Telecommunications equipment
- Consumer appliances
- Architectural hardware
- General engineering assemblies
Advantages
- Flush mounting after installation
- Smooth finished appearance
- Suitable where protruding heads are not acceptable
- Traditional slotted drive for simple installation
- Available in numerous materials and finishes
- Compatible with standard metric threaded holes and nuts
- Good choice for machinery, furniture, and electrical equipment
- Corrosion-resistant options available
- Suitable for automated and manual assembly depending on application
Frequently Asked Questions
What is DIN 963?
DIN 963 specifies metric slotted countersunk head machine screws with a 90° head angle designed to sit flush with the mounting surface.
What is the difference between DIN 963 and DIN 965?
DIN 963 uses a slotted drive, while DIN 965 uses a Phillips cross recess. Both have the same countersunk head style but require different screwdrivers.
Is DIN 963 still commonly used?
Yes. Although Phillips, Pozidriv, Torx, and Hex drives are increasingly popular, DIN 963 screws remain widely used in maintenance, restoration, electrical equipment, and applications requiring traditional slotted fasteners.
Is DIN 963 fully threaded?
Yes. DIN 963 machine screws are generally supplied fully threaded.
What materials are available?
DIN 963 screws are commonly manufactured in stainless steel, carbon steel, brass, aluminium, titanium, and nylon.
Can DIN 963 screws be used outdoors?
Yes, when manufactured from stainless steel or supplied with suitable corrosion-resistant coatings.
Why choose a countersunk head screw?
Countersunk screws provide a flush surface finish, reducing snagging, improving appearance, and allowing mating parts to sit flat.
Need Technical Assistance or a Quote?
Looking for pricing, samples, CAD drawings, or help selecting the right fastener? Our team can help you choose the correct product for your application.
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