Product Description
5/16"-18 UNC A2 Stainless Socket Cup Point Grub Screws
These 5/16"-18 UNC socket grub screws are manufactured from A2 austenitic stainless steel, providing good corrosion resistance for general indoor, outdoor, automotive and engineering applications.
The headless design allows the screw to sit flush with or below the surface of the component. A hexagon socket provides positive installation with a 5/32" Allen key, while the cup point concentrates holding pressure against a shaft or mating component.
- Thread size: 5/16"-18 UNC
- Threads per inch: 18 TPI
- Thread form: Unified National Coarse
- Material: A2 austenitic stainless steel
- Finish: Natural stainless steel
- Head style: Headless socket set screw
- Point style: Cup point
- Drive: Internal hexagon socket
- Allen key size: 5/32"
- Dimensional standard: ASME B18.3
- Thread standard: ASME B1.1
- Legacy British Standard: BS 2470:1973
Typical Applications
- Securing gears, pulleys and collars to shafts
- Locating handles, knobs and levers
- Automotive and motorcycle components
- Machinery, equipment and instrument assemblies
- Maintenance and general engineering work
- Applications requiring a flush or concealed fixing
Installation Guidance
Install using a correctly fitting 5/32" Allen key or hexagon drive bit. Ensure the receiving component has a compatible 5/16"-18 UNC internal thread. The screw length is measured over its complete end-to-end length.
Cup points provide strong holding power but can mark or indent the mating surface. Use a suitable flat, keyway or prepared seating point where surface damage or accurate positioning is important.
Stainless steel fasteners can gall when tightened into stainless steel mating threads. A suitable anti-seize compound and controlled installation speed can help reduce this risk.
Browse all UNC socket grub screws, view the complete A2 stainless UNC grub screw range, or consult our thread data guide.
Please note: Dimensions are provided as a guide. Where point form, mechanical properties, corrosion resistance or dimensional compliance is critical, please confirm the specification before ordering.
| A | B | C | D |
| 5/16" | 1/2" | 5/32" | 18 |
| 5/16" | 1" | 5/32" | 18 |
| 5/16" | 3/4" | 5/32" | 18 |
Please Note: Specifications given are intended as a guide only. If critical to your project please check with us first.
