Product Description
5/16″ UNC A2 Stainless Steel Hexagon Head Bolts With Shank
These 5/16″ UNC hexagon head bolts are manufactured from A2 stainless steel and feature a partially threaded plain shank. They have a standard 5/16″-18 Unified National Coarse thread and are available in imperial lengths from 1 1/2″ to 4 1/4″.
The unthreaded portion provides a plain bearing surface through the joint. These bolts are suitable for machinery, automotive work, restoration, fabrication, maintenance and general engineering applications where a part-threaded UNC fastener is required.
Product specification
- Nominal diameter: 5/16″
- Thread: 5/16″-18 UNC
- Thread pitch: 18 threads per inch
- Available lengths: 1 1/2″ to 4 1/4″
- Thread form: Unified National Coarse
- Thread coverage: Part threaded with plain shank
- Standard thread length: Approximately 7/8″
- Head type: Hexagon head
- Spanner size: 1/2″ AF
- Approximate head height: 7/32″ as listed
- Material: A2 stainless steel
- Relevant dimensional standard: ASME B18.2.1 pattern, subject to supplier confirmation
- Thread standard: ASME B1.1
- Property class: Not stated – check markings or certification where mechanical strength is critical
Available lengths
Overall bolt length is measured from beneath the hexagon head to the end of the bolt. The approximate plain shank length is calculated by subtracting the 7/8″ thread length from the overall length.
A2 stainless steel
A2 stainless steel provides good corrosion resistance in many indoor and general outdoor environments without requiring an additional protective coating. A4 stainless steel is normally preferable for coastal, marine, swimming-pool and other chloride-rich environments.
Stainless-steel threads can be susceptible to galling during assembly. Use clean mating threads, an appropriate anti-seize compound and controlled installation speeds, particularly when fitting stainless bolts and nuts together.
Compatibility and technical information
Use only matching 5/16″-18 UNC nuts. This thread is not interchangeable with 5/16″ UNF, 5/16″ Whitworth or metric M8 fasteners.
- Browse compatible imperial nuts
- Browse imperial washers
- UNC and UNF thread data guide
- Spanner size guide
- A2 versus A4 stainless-steel guide
- Stainless-steel thread galling guide
| A | B | C | D | E | F | G |
| 5/16" | 2 1/2" | 7/8" | 1/2" | 7/32" | 18 | 1 5/8" |
| 5/16" | 3 1/4" | 7/8" | 1/2" | 7/32" | 18 | 2 3/8" |
| 5/16" | 3" | 7/8" | 1/2" | 7/32" | 18 | 2 1/8" |
| 5/16" | 4 1/4" | 7/8" | 1/2" | 7/32" | 18 | 3 3/8" |
| 5/16" | 4" | 7/8" | 1/2" | 7/32" | 18 | 3 1/8" |
| 5/16" | 3 1/2" | 7/8" | 1/2" | 7/32" | 18 | 2.625" |
| 5/16" | 3 1/4" | 7/8" | 1/2" | 7/32" | 18 | 2.375" |
| 5/16" | 2 3/4" | 7/8" | 1/2" | 7/32" | 18 | 1.875" |
| 5/16" | 2 1/4" | 7/8" | 1/2" | 7/32" | 18 | 1.375" |
| 5/16" | 2" | 7/8" | 1/2" | 7/32" | 18 | 1.25" |
| 5/16" | 1 3/4" | 7/8" | 1/2" | 7/32" | 18 | 0.875" |
| 5/16" | 1 1/2" | 7/8" | 1/2" | 7/32" | 18 | 0.625" |
Please Note: Specifications given are intended as a guide only. If critical to your project please check with us first.
