Product Description
5/16"-18 UNC A2 Stainless-Steel Socket Cap Screws
These 5/16"-18 UNC socket cap screws are manufactured from A2 stainless steel and are fully threaded along their available length. The 18 threads per inch Unified National Coarse thread makes them suitable for compatible imperial machinery, equipment and engineering assemblies.
The cylindrical socket cap head incorporates a 1/4-inch internal hexagon drive, providing secure tool engagement while allowing installation where access around the fastener head is restricted.
Product Details
- Thread size: 5/16"-18 UNC
- Nominal thread diameter: 5/16"
- Threads per inch: 18 TPI
- Thread series: UNC – Unified National Coarse
- Available lengths: 1/2", 5/8", 1" and 1 1/2"
- Threading: Fully threaded
- Head type: Cylindrical socket cap
- Drive type: 1/4" internal hexagon socket
- Published head diameter: Approximately 0.45"
- Published head height: Approximately 0.30"
- Material: A2 stainless steel
- Finish: Natural stainless steel
- Dimensional pattern: ASME B18.3
Features and Benefits
- A2 stainless steel provides good general-purpose corrosion resistance
- 5/16"-18 UNC thread for compatible imperial assemblies
- Fully threaded design maximises usable thread engagement
- Compact socket cap head is suitable for restricted spaces
- 1/4" internal hexagon drive provides secure tool engagement
- ASME B18.3-style imperial socket cap configuration
- Available in four useful imperial lengths
Typical Applications
Suitable for imperial machinery, automotive components, brackets, enclosures, tooling, fixtures and general engineering assemblies requiring a fully threaded 5/16"-18 UNC stainless-steel fastener.
Installation Guidance
Confirm that the mating component has a 5/16"-18 UNC thread before installation. These screws are not interchangeable with 5/16"-24 UNF or similarly sized metric threads.
Screw length is measured from beneath the socket cap head to the end of the fastener. Use a correctly fitting 1/4-inch hex key and apply a tightening torque suitable for the joint, mating material and application.
Stainless-steel threads can be susceptible to galling. Using a suitable anti-seize compound and installing at a controlled speed can help reduce this risk.
A2 stainless steel is suitable for many general-purpose applications but may not be appropriate for prolonged salt-water, marine or aggressive chemical exposure. Consider A4 stainless steel where greater corrosion resistance is required.
Please note that the published head diameter and height are rounded guide dimensions. Confirm any dimensional, safety-critical or application-critical requirements before ordering.
| A | B | C | D | E | F |
| 5/16" | 5/8" | 0.45 | 0.30 | 1/4 | 18 |
| 5/16" | 1/2" | 0.45 | 0.30 | 1/4 | 18 |
| 5/16" | 1 1/2" | 0.45 | 0.30 | 1/4 | 18 |
| 5/16" | 1" | 0.45 | 0.30 | 1/4 | 18 |
Please Note: Specifications given are intended as a guide only. If critical to your project please check with us first.
