Product Description
9/16"-18 UNF Grade 5 Zinc Plated Hexagon Head Bolts With Shank
These 9/16" 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 2 1/4" to 4 1/2", they have a partially threaded construction with an unthreaded shank through part of the fastening.
The 9/16"-18 UNF thread has 18 threads per inch and is commonly used in automotive, agricultural, machinery, restoration and specialist engineering applications. UNF is a fine-pitch Unified thread and must be paired with a matching 9/16"-18 UNF nut or internally threaded component.
- Thread size: 9/16"-18 UNF
- Threads per inch: 18 TPI
- Available lengths: 2 1/4", 2 1/2", 2 3/4", 3 1/2" and 4 1/2"
- Thread form: Unified National Fine
- Thread coverage: Part threaded with unthreaded shank
- Nominal threaded length: 1 3/8"
- 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: 13/16" AF
- Nominal head height: 3/8"
- British dimensional standard: BS 1768
- Thread standard: ASME B1.1
The unthreaded shank can pass through the clearance holes of assembled components, allowing the solid portion of the bolt to sit through the joint when the appropriate length is selected. This can help keep the threaded section away from the primary shear plane.
SAE Grade 5 is a recognised high-tensile imperial fastener grade and is broadly comparable in strength to metric property class 8.8. The two grading systems are not identical or directly interchangeable, so the correct thread system and specified strength grade must always be used.
The zinc-plated finish provides protection for indoor and moderately exposed applications. It is not a replacement for galvanised or stainless steel where the fastener will be exposed to highly corrosive, marine or continuously wet conditions.
Complete your fastening 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 |
| 9/16" | 4 1/2" | 1 3/8" | 13/16" | 3/8" | 18 | 3 1/8" |
| 9/16" | 2 1/4" | 1.33" | 13/16" | 3/8" | 18 | 59/64" |
| 9/16" | 2 3/4" | 1.33" | 13/16" | 3/8" | 18 | 1 27/64" |
Please Note: Specifications given are intended as a guide only. If critical to your project please check with us first.
