Product Description
1/2" UNC Grade 8 Flat Head Square Neck Plough Bolts
1/2"-13 UNC Grade 8 high tensile steel plough bolts with flat countersunk heads, square necks and fully threaded shanks. Available in 2" and 2 1/4" lengths, these bolts suit compatible plough bolt seats in agricultural machinery, earthmoving equipment and replacement wear components.
The flat head seats into a matching recess, while the square neck locates in a suitable square hole to resist rotation as the mating nut is tightened. Also known as plow bolts, these fasteners should be matched to the original equipment's head and neck dimensions.
Specifications
| Product type | Flat head square neck plough bolt / plow 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 |
| Head style | Flat countersunk |
| Neck style | Square neck |
| Thread coverage | Fully threaded shank below the square neck |
| Length measurement | Overall length, including the flat head |
Available Lengths
| Imperial length | Metric equivalent |
|---|---|
| 2" | 50.80mm |
| 2 1/4" | 57.15mm |
Key Features
- Grade 8 high tensile steel construction.
- 1/2"-13 UNC coarse thread.
- Flat countersunk head for seating in a matching recess.
- Square neck helps prevent rotation during tightening.
- Fully threaded shank below the neck.
- Available in 2" and 2 1/4" lengths.
Selection and Installation
Check the thread, overall length, head profile and square neck dimensions against the equipment specification. Ensure that the head seats correctly and the square neck engages the locating hole before tightening.
Use a compatible 1/2"-13 UNC nut of a suitable strength grade. Tighten in accordance with the equipment manufacturer's instructions and confirm adequate thread engagement.
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 reference.
- ASME B18.9 – dimensional reference for No. 3 flat head square neck plough bolts.
- ASME B1.1 – Unified inch thread reference.
Confirm critical head and neck dimensions before ordering for a specific replacement application.
