ISO 4027:2026 / DIN 914: Cone Point Hex Socket Set Screw
A technical guide to headless hex socket set screws, truncated cone points, industrial applications, special materials and made-to-drawing CNC manufacturing.
A set screw for locking, fastening and positioning
ISO 4027, traditionally associated with DIN 914, is a headless set screw with hex socket drive and a truncated cone point.
Its main function is to lock or position mechanical components such as shafts, pulleys, gears, bushings, couplings, tooling and precision industrial assemblies.
Key data
What is an ISO 4027 screw?
It is a headless set screw designed to sit inside a threaded hole without protruding from the assembly.
ISO 4027:2026 defines set screws with coarse pitch metric thread, hex socket, truncated cone point and product grade A.
Headless
Allows compact and clean fastening inside the component.
Hex socket
Allows tightening with a hex key from the inside.
Cone point
Concentrates pressure on a localised contact area.
Metric thread
Applicable in standardised or custom industrial solutions.
What is the cone point used for?
The cone point concentrates the tightening force on a reduced surface, helping to achieve firm locking of the component.
This geometry is useful when relative movement between parts must be limited, when working on a shaft or when more localised positioning is required than with a flat point.
Recommended use
- Prevent movement between components.
- Lock pulleys, gears or bushings onto shafts.
- Work in prepared seats designed to receive the point.
- Achieve greater localised penetration.
- Improve fastening in assemblies exposed to vibration.
Main features of ISO 4027
The selection of a set screw does not depend only on diameter or length. The point geometry defines how force is transmitted to the part.
| Feature | ISO 4027 |
|---|---|
| Type | Set screw |
| Drive | Hex socket |
| End | Truncated cone point |
| Head | No external head |
| Thread | ISO metric |
| Product grade | A |
| Traditional reference | DIN 914 |
Common ISO 4027 / DIN 914 sizes
Within the range covered by the standard, multiple coarse pitch metric diameters are used.
The final selection must be made according to the applicable edition of the standard, the material, the required length and the technical documentation of the project.
| Thread | Coarse metric pitch |
|---|---|
| M3 | 0.50 mm |
| M4 | 0.70 mm |
| M5 | 0.80 mm |
| M6 | 1.00 mm |
| M8 | 1.25 mm |
| M10 | 1.50 mm |
| M12 | 1.75 mm |
| M16 | 2.00 mm |
| M20 | 2.50 mm |
| M24 | 3.00 mm |
ISO 4027 vs ISO 4026
Both belong to the family of hex socket set screws, but they mainly differ in the shape of the point.
| Feature | ISO 4026 | ISO 4027 |
|---|---|---|
| End | Flat | Truncated cone |
| Contact | Flat surface | Localised area |
| Marking on the part | Lower | Higher |
| Penetration | Low | Greater |
| Typical use | General locking | Localised locking |
ISO 4026, ISO 4027, ISO 4028 and ISO 4029
Each point geometry creates a different behaviour on the component.
Materials for custom ISO 4027 screws
Material selection must consider mechanical strength, corrosion, temperature and real service conditions.
When a standard commercial solution does not meet the project specifications, CNC machining allows set screws to be manufactured in steels, stainless steels and high-performance alloys.
Industrial applications of ISO 4027
Cone point set screws are used in assemblies where components need to be locked, fastened or positioned with precision.
Shafts
Pulleys
Gears
Couplings
Bushings
Tooling
Automation
Machinery
CNC manufacturing of custom ISO 4027 screws
Certain applications require set screws with specific dimensions, materials or finishes.
At AREM-CNC, we manufacture special fasteners and components according to standards, technical drawings, physical samples or customer specifications.
Customisable parameters
- Length and diameter.
- Material and thread pitch.
- Specific tolerances.
- Point geometry.
- Hex socket depth.
- Surface finish.
- Special made-to-drawing features.
Technical documentation for demanding sectors
In industrial projects, material traceability can be as important as the geometry or dimensions of the part.
Depending on the project requirements, certificates and documentation may be requested to verify the origin and characteristics of the component.
When should a custom ISO 4027 screw be manufactured?
Made-to-drawing CNC manufacturing is suitable when a commercial part does not meet the real needs of the assembly.
Non-standard length
When no commercial size is suitable for the assembly.
Specific material
When the environment requires stainless steels, nickel, titanium or special alloys.
Corrosion or temperature
When the part must withstand severe service conditions.
Tight tolerances
When standard tolerances are not enough for the assembly.
Modified geometry
When the point, hex socket or thread must be adapted to the design.
Full traceability
When the project requires certificates and technical documentation.
Frequently asked questions about ISO 4027
What is an ISO 4027 screw?
It is a headless set screw with hex socket drive and a truncated cone point, used to lock or position mechanical components.
Are ISO 4027 and DIN 914 equivalent?
DIN 914 is the traditional reference associated with this type of screw. In industrial projects, the standard and edition indicated in the drawing or technical documentation should always be checked.
What is the difference between ISO 4026 and ISO 4027?
ISO 4026 uses a flat point, while ISO 4027 uses a truncated cone point. This difference changes the way the screw transmits pressure to the component.
Can ISO 4027 be manufactured in Inconel or Superduplex?
Yes. CNC machining can be used to manufacture special screws in Inconel, Hastelloy, Duplex, Superduplex, Monel, titanium and other alloys, provided the design is feasible and correctly specified.
What is a cone point set screw used for?
It is mainly used to fasten or position shafts, pulleys, gears, bushings, couplings and other components where localised contact and firm locking are required.
Do you need custom ISO 4027 screws manufactured?
Send us your drawing, sample or technical specification. Our team will review dimensions, material, tolerances, finish and traceability requirements.