Product Description
5/16"-24 UNF Grade 5 Zinc Plated Hexagon Head Bolts With Shank
These 5/16" UNF hexagon head bolts are manufactured from high-tensile Grade 5 steel and finished with zinc plating for additional protection against corrosion. Available in lengths from 1 1/4" to 6", they feature a partially threaded design with an unthreaded shank through part of the fastening.
The 5/16"-24 UNF thread has 24 threads per inch and provides finer adjustment and a greater number of engaged threads than the corresponding 5/16"-18 UNC coarse thread. These bolts are suitable for automotive, motorcycle, machinery, restoration and general engineering applications that specify a 5/16" UNF fixing.
- Thread size: 5/16"-24 UNF
- Threads per inch: 24 TPI
- Available lengths: 1 1/4", 1 1/2", 1 3/4", 2", 2 1/4", 2 1/2", 2 3/4", 3", 3 1/4", 3 1/2", 3 3/4", 4", 5" and 6"
- Thread form: Unified National Fine
- Thread coverage: Part threaded with unthreaded shank
- Nominal threaded length: 7/8"
- Material: High-tensile steel
- Strength grade: SAE Grade 5
- Approximate metric comparison: Property class 8.8
- Finish: Zinc plated
- Head style: Hexagon head
- Spanner or socket size: 1/2" AF
- Nominal head height: 7/32"
- British dimensional standard: BS 1768
- American dimensional standard: ASME B18.2.1
- Thread standard: ASME B1.1
The solid, unthreaded shank can pass through the clearance holes of assembled components, keeping the threaded section away from the main shear plane when the correct bolt length is selected. This makes partially threaded bolts useful for machinery, brackets, suspension components and other securely clamped assemblies.
SAE Grade 5 is a recognised high-tensile imperial fastener grade and is broadly comparable in strength to metric property class 8.8. These designations are not identical or directly interchangeable, so the correct imperial or metric fastener should always be selected for the application.
Complete your assembly with suitable nuts and washers. For help identifying imperial threads, please see our Thread Data Guide and Spanner Sizes Guide.
Please note: Bolt length is measured from beneath the hexagon head to the end of the bolt. Threaded and shank lengths are nominal reference dimensions and may vary within manufacturing tolerances. If any dimension, strength grade or standard compliance is critical, please contact us before ordering.
| A | B | C | D | E | F | G |
| 5/16" | 1 1/2" | 7/8" | 1/2" | 7/32" | 24 | 5/8" |
| 5/16" | 1 1/4" | 7/8" | 1/2" | 7/32" | 24 | 3/8" |
| 5/16" | 1 3/4" | 7/8" | 1/2" | 7/32" | 24 | 7/8" |
| 5/16" | 2 1/2" | 7/8" | 1/2" | 7/32" | 24 | 1 5/8" |
| 5/16" | 2 1/4" | 7/8" | 1/2" | 7/32" | 24 | 1 3/8" |
| 5/16" | 2 3/4" | 7/8" | 1/2" | 7/32" | 24 | 1 5/8" |
| 5/16" | 2" | 7/8" | 1/2" | 7/32" | 24 | 1 1/8" |
| 5/16" | 3 1/2" | 7/8" | 1/2" | 7/32" | 24 | 2 5/8" |
| 5/16" | 3" | 7/8" | 1/2" | 7/32" | 24 | 2 1/8" |
| 5/16" | 4" | 7/8" | 1/2" | 7/32" | 24 | 3 1/8" |
| 5/16" | 5" | 7/8" | 1/2" | 7/32" | 24 | 4 1/8" |
| 5/16" | 6" | 7/8" | 1/2" | 7/32" | 24 | 5 1/8" |
| 5/16" | 3 1/4" | 7/8" | 1/2" | 7/32" | 24 | 2.375" |
Please Note: Specifications given are intended as a guide only. If critical to your project please check with us first.
