Product Description
UNC Grade 8 Raised Head Part-Threaded Plough Bolts
Grade 8 high tensile steel plough bolts with raised heads and part-threaded UNC imperial coarse threads. Available in 5/8" and 3/4" nominal thread sizes, these bolts have a plain shank between the head area and threaded section.
Also known as plow bolts, they are intended for compatible seats in agricultural machinery, earthmoving equipment and replacement wear components. Match the raised head profile and locating arrangement to the original equipment specification.
Specifications
| Product type | Raised head plough bolt / plow bolt |
|---|---|
| Material | High tensile steel |
| Strength grade | SAE Grade 8 |
| Head style | Raised head |
| Thread type | UNC – Unified National Coarse |
| Thread direction | Right-hand |
| Thread coverage | Part-threaded, with a plain shank |
| Nominal thread sizes | 5/8" and 3/4" |
Thread Sizes and Pitches
| Nominal thread size | Threads per inch |
|---|---|
| 5/8" UNC | 11 TPI |
| 3/4" UNC | 10 TPI |
Listed Length Options
| Imperial length | Metric equivalent |
|---|---|
| 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 |
| 5 1/2" | 139.70mm |
Choose the required diameter and length from the available options. Availability may vary by size combination.
Key Features
- Grade 8 high tensile steel construction.
- Raised head plough bolt design.
- Part-threaded shank for assemblies requiring an unthreaded section.
- UNC coarse threads in 5/8" and 3/4" nominal sizes.
- Seven listed lengths from 2 3/4" to 5 1/2".
Selection and Installation
Match the thread diameter, TPI, length and head profile to the equipment specification. Check the head seating dimensions, locating feature and plain shank length before ordering, particularly when replacing bolts in worn components.
Ensure sufficient thread engagement with the mating nut. Use compatible nuts and tighten in accordance with the equipment manufacturer's instructions. Confirm the length measurement convention where fitting dimensions are critical.
Pack Sizes
Available in packs of 1, 5, 10, 20, 50 and 100. Select the required size, length and pack quantity from the options.
Standards
- SAE J429 – Grade 8 mechanical property reference.
- ASME B1.1 – Unified inch thread reference.
No specific dimensional standard has been verified for this raised head range.
