Product Description
1/4" UNC A2 Stainless Steel Pan Phillips Head Machine Screws
These 1/4" UNC pan Phillips machine screws are manufactured from A2 stainless steel and feature a 20 TPI coarse thread. The pan head provides a flat bearing surface beneath a rounded top and sits above the component surface when installed.
The Phillips recess takes a PH3 screwdriver or driver bit. These screws are suitable for use with matching 1/4"-20 UNC nuts or tapped holes in equipment, brackets, panels and general engineering assemblies. A2 stainless steel provides corrosion resistance for many everyday applications.
Technical Specifications
| Thread Size | 1/4"-20 UNC |
|---|---|
| Nominal Thread Diameter | 1/4" — 6.35 mm |
| Threads Per Inch | 20 TPI |
| Thread Pitch | 1.27 mm |
| Thread Form | Unified National Coarse |
| Material | A2 stainless steel |
| Head Style | Pan head |
| Drive Type | Phillips cross recess |
| Driver Size | PH3 |
| Head Diameter | 0.473–0.492" — approximately 12.01–12.50 mm |
| Head Height | 0.162–0.175" — approximately 4.11–4.45 mm |
| Dimensional Reference | ASME B18.6.3 |
Available Lengths
Screw length is measured from beneath the head to the tip, excluding the head. Metric equivalents are provided for reference.
| Imperial Length | Metric Equivalent |
|---|---|
| 1/2" | 12.70 mm |
| 5/8" | Approximately 15.88 mm |
| 1" | 25.40 mm |
| 1 1/4" | 31.75 mm |
Selecting Your Machine Screws
Select the required length and pack quantity from the available options. Allow for the thickness of the components and any washers, together with sufficient engagement in the matching nut or tapped hole.
Check the thread before ordering. These screws have a 1/4"-20 UNC thread and are not interchangeable with 1/4"-28 UNF or M6 metric screws.
Use a correctly fitting PH3 driver and keep it aligned with the screw during tightening to help protect the recess.
Browse Related Categories
| A | B | C | D | E |
| 1/4" | 1 1/4" | 0.48" | 0.17" | 20 |
| 1/4" | 5/8" | 0.48" | 0.17" | 20 |
| 1/4" | 1/2" | 0.48" | 0.17" | 20 |
| 1/4" | 1" | 0.48" | 0.17" | 20 |
Please Note: Specifications given are intended as a guide only. If critical to your project please check with us first.
