Product Description
1/2" UNC Grade 8 Yellow Zinc Plated Part-Threaded Hex Bolts
1/2"-13 UNC Grade 8 hexagon head bolts manufactured from high tensile steel with a yellow zinc plated finish. These imperial bolts feature a part-threaded design with a plain shank beneath the head, for assemblies requiring an unthreaded section through the components.
The external hexagon head takes a 3/4" spanner or socket. Available in fifteen lengths, these bolts suit machinery assembly, engineering repairs and maintenance work requiring a matching UNC coarse thread.
Specifications
| Product type | Part-threaded hexagon head bolt |
|---|---|
| Nominal thread diameter | 1/2" – 12.7mm |
| Thread type | UNC – Unified National Coarse |
| Threads per inch | 13 TPI |
| Thread direction | Right-hand |
| Material | High tensile steel |
| Strength grade | SAE Grade 8 |
| Finish | Yellow zinc plated |
| Head style | External hexagon |
| Spanner / socket size | 3/4" across flats |
| Thread coverage | Part-threaded, with a plain shank |
| Length measurement | From underneath the head to the bolt tip |
Available Lengths
| Imperial length | Metric equivalent |
|---|---|
| 2" | 50.80mm |
| 2 1/4" | 57.15mm |
| 2 1/2" | 63.50mm |
| 2 3/4" | 69.85mm |
| 3" | 76.20mm |
| 3 1/4" | 82.55mm |
| 3 1/2" | 88.90mm |
| 3 3/4" | 95.25mm |
| 4" | 101.60mm |
| 4 1/4" | 107.95mm |
| 4 1/2" | 114.30mm |
| 4 3/4" | 120.65mm |
| 5" | 127.00mm |
| 5 1/2" | 139.70mm |
| 5 3/4" | 146.05mm |
Key Features
- SAE Grade 8 high tensile steel construction.
- 1/2"-13 UNC coarse thread.
- Part-threaded design with a plain shank.
- Yellow zinc plated finish for added corrosion resistance.
- Hexagon head for use with a 3/4" spanner or socket.
- Fifteen available lengths from 2" to 5 3/4".
Selection and Installation
Use with matching 1/2"-13 UNC nuts or tapped holes. Check that the selected length provides sufficient thread engagement and that the plain shank suits the assembly thickness. Confirm thread and shank lengths before ordering where their position is critical.
Use compatible nuts and washers suitable for the joint. Tighten to the torque specified for the assembly, taking the plated finish and lubrication condition into account.
Pack Sizes
Available in packs of 1, 5, 10, 20, 50 and 100. Select the required length and pack quantity from the options.
Standards
- SAE J429 – Grade 8 mechanical property specification.
- ASME B18.2.1 – imperial hexagon head fastener dimensional reference.
- ASME B1.1 – Unified inch thread reference.
