Product Description
1/4"-20 UNC Solid Brass Socket Cup Point Grub Screws
These solid brass grub screws feature a 1/4"-20 UNC thread, an internal hexagon socket drive and a cup point tip. Their headless design suits component retention and adjustment where a projecting screw head would be unsuitable.
The recessed cup point forms a circular contact edge that bears against the mating component. The internal socket allows installation and adjustment using a suitable imperial Allen key.
Product Specifications
| Material | Solid brass |
|---|---|
| Product Type | Headless grub screw / socket set screw |
| Thread Form | UNC – Unified National Coarse |
| Nominal Thread Diameter | 1/4" |
| Threads Per Inch | 20 TPI |
| Equivalent Thread Pitch | 1.27mm |
| Drive | Internal hexagon socket / Allen key |
| Point Type | Cup point |
| Available Lengths | 3/8" and 1/2" |
Available Sizes
| Thread Size | Length | Metric Length Equivalent |
|---|---|---|
| 1/4"-20 UNC | 3/8" | 9.525mm |
| 1/4"-20 UNC | 1/2" | 12.70mm |
The nominal thread diameter is equivalent to 6.35mm. Metric equivalents are provided for reference; these screws require a matching 1/4"-20 UNC tapped hole.
Installation and Measuring
Grub screw length is measured over the complete screw, including the point. Select a length that provides suitable thread engagement and positions the cup point correctly against the component being retained.
Start the screw by hand, fully engage a correctly fitting imperial hex key and tighten carefully to suit the brass screw and mating components.
Select the required length and pack quantity using the product options.
