Product Description
¼"-28 UNF Self Colour Steel Countersunk Socket Screws
High tensile steel countersunk socket screws with a ¼"-28 UNF fine thread and a self colour, unplated finish. The flat countersunk head provides a flush fixing when installed in a correctly prepared countersunk hole.
The internal hexagon socket allows installation with a matching imperial Allen key. Available in six lengths from ½" to 1½" for machinery, equipment maintenance and general engineering assemblies.
Specifications
| Feature | Specification |
|---|---|
| Fastener type | Flat countersunk socket screw |
| Material | High tensile steel |
| Finish | Self colour – unplated |
| Thread system | UNF – Unified National Fine |
| Thread size | ¼"-28 UNF |
| Nominal thread diameter | ¼" (6.35mm) |
| Thread pitch | 28 threads per inch |
| Head style | Flat countersunk |
| Drive type | Internal hexagon socket / imperial Allen key |
| Length measurement | Overall length, including the countersunk head |
Available Lengths
| Imperial Length | Metric Conversion |
|---|---|
| ½" | 12.7mm |
| ⅝" | 15.875mm |
| ¾" | 19.05mm |
| 1" | 25.4mm |
| 1¼" | 31.75mm |
| 1½" | 38.1mm |
Metric values are conversions of the nominal imperial lengths.
Key Features
- ¼"-28 UNF fine thread for matching nuts and tapped holes.
- Countersunk head for a flush finish in a suitable recess.
- Internal hexagon socket for Allen key installation.
- High tensile steel with a self colour finish.
- Six lengths with a choice of pack quantities.
Typical Applications
Suitable for machinery covers, brackets, panels and equipment repairs requiring an imperial fine thread and a flush screw head.
Installation
Check the mating thread, required engagement and countersink dimensions before installation. Prepare the countersink to suit the actual screw head and use a correctly fitting imperial Allen key.
Ordering
Select the required overall length and a pack quantity of 1, 5, 10, 20, 50, 100, 250, 500 or 1000. The selected length includes the head.
