Product Description
M3 × 25mm Brass Hexagon Head Fully Threaded Set Screws
These M3 brass hexagon-head set screws have a standard 0.5mm metric coarse thread extending along the shank. In UK fastener terminology, a set screw is a fully threaded hexagon-head fastener and should not be confused with a headless grub screw.
Solid brass fasteners are commonly selected for their corrosion resistance, attractive appearance and suitability for electrical, electronic, decorative and general engineering assemblies. The external hexagon head allows installation using a standard spanner or socket.
Product specifications
- Thread size: M3
- Thread pitch: 0.5mm metric coarse
- Length: 25mm
- Threading: Fully threaded
- Material: Solid brass
- Head style: External hexagon head
- Width across flats: Approximately 5.5mm
- Head height: Approximately 2mm
- Recommended spanner or socket: 5.5mm
- Available pack sizes: 5, 10, 20, 50, 100 and 250
Available size
| Thread size | Length | Hexagon size | Head height | Thread pitch |
|---|---|---|---|---|
| M3 | 25mm | Approximately 5.5mm | Approximately 2mm | 0.5mm |
Length measurement: Hexagon-head screw length is measured from beneath the head to the end of the threaded shank.
Standards information
- DIN 933: Traditional dimensional reference for metric hexagon-head screws threaded up to the head.
- ISO 4017:2022: Current international dimensional standard for metric hexagon-head screws with product grades A and B.
- BS EN ISO 4017:2022: Current British adoption of ISO 4017.
The dimensions shown for this product correspond with the DIN 933 / ISO 4017 fully threaded hexagon-head pattern.
Typical applications
- Electrical and electronic assemblies
- Decorative fittings and visible fixings
- Instrumentation and model engineering
- Light-duty machinery and equipment
- General repair and maintenance work
Installation guidance
- Use a correctly fitting 5.5mm spanner or socket to reduce the risk of damaging the hexagon.
- Confirm that the mating component has an M3 × 0.5 thread.
- Do not substitute brass where a high-tensile steel fastener has been specified.
- Avoid excessive tightening because brass is softer than standard carbon or alloy steel.
- Check material compatibility where the screw will contact dissimilar metals or operate in a corrosive environment.
Related categories and technical information
- Browse metric brass hexagon-head bolts and set screws
- Browse all hexagon-head bolts and set screws
- View the Metric, UNC, UNF and BSP thread data guide
- View the spanner size guide
- How to measure a bolt or screw
Specifications are provided as a guide. If the precise brass alloy, mechanical strength, dimensional tolerance or formal standards compliance is critical to your application, please contact us for confirmation before ordering.
