Ball & Pin Towballs: A Complete Guide for Heavy‑Duty Towing

Ball and pin towballs are a popular choice for drivers who regularly tow plant trailers, agricultural equipment, or use tow ropes. Unlike a standard 50mm towball, this setup combines a traditional towball with a heavy‑duty pin and jaw system, giving you far greater flexibility when connecting specialist trailers and equipment.

This guide explains how ball and pin towballs work, when you need one, the difference between 2‑bolt and 4‑bolt options, and how to check whether your vehicle and towbar are suitable.

What Is a Ball & Pin Towball?

A ball and pin towball replaces the standard towball on a fixed flange towbar. It features:

• A 50mm towball for conventional trailers
• A pin and jaw assembly positioned directly beneath the ball

The pin passes through the jaw to secure plant trailers, NATO‑style hitches, and tow ropes. This makes it ideal for commercial, agricultural, and industrial towing, where equipment often uses alternative coupling systems.

Because the ball and pin combines two towing methods into one unit, it’s one of the most versatile towing accessories available.

When Do You Need a Ball & Pin Towball?

You’ll typically require a ball and pin towball if you:

• Tow plant trailers with a jaw‑type coupling
• Use tow ropes for recovery or agricultural work
• Tow equipment trailers that don’t use a standard 50mm hitch
• Need a stronger, more secure connection for heavy loads

For everyday caravans, bike racks, and domestic trailers, a standard towball is usually sufficient. Ball and pin towballs are designed for heavier, more demanding towing environments.

Vehicle Compatibility and Towing Capacity

Ball and pin towballs can be fitted to most vehicles equipped with a fixed flange towbar. However, you must ensure:

• Your vehicle’s towing capacity is suitable
• The towbar itself is rated for the required load
• The correct bolt pattern (2‑bolt or 4‑bolt) is used

If you’re unsure, our customer service team can check your vehicle’s towing limits and confirm which ball and pin option is appropriate.

2‑Bolt vs 4‑Bolt Ball & Pin Towballs

Ball and pin towballs come in two mounting styles:

2‑Bolt Ball & Pin Towball

• D‑Value: 21kN
• Suitable for most vehicles
• Fits standard 2‑bolt flange towbar plates

4‑Bolt Ball & Pin Towball

• D‑Value: 31kN
• Designed for heavier towing
• Requires a towbar with a compatible 4‑bolt flange plate
• Often used on commercial vehicles and high‑capacity 4x4s

The D‑Value determines the maximum permissible weight of the towing vehicle and trailer combination.

Understanding D‑Value (With Example)

The D‑Value is calculated using:

Where:

• T = Towing vehicle weight (GVW)
• C = Trailer weight
• 9.81 = Gravity constant

Example Calculation

For a 3.5‑tonne vehicle towing a 3.5‑tonne trailer:

This means a 2‑bolt ball and pin (21kN) would be suitable, but heavier combinations may require the 4‑bolt option.

Is a Ball & Pin Towball Right for Your Vehicle?

Most vehicles can safely use a 2‑bolt ball and pin, but if you need the 4‑bolt heavy‑duty version, we’ll check:

• Your vehicle’s maximum towing capacity
• Whether the towbar we’re fitting supports the larger bolt pattern
• The intended use (plant trailer, agricultural equipment, recovery work, etc.)

Our team can advise you before booking to ensure you get the correct setup.

Why Choose Towbar Express for Your Ball & Pin Towball?

• Fully guaranteed towbar fitting
• Professional mobile fitters across the UK
• 5‑star Trustpilot reviews
• Secure online booking
• Expert advice from our customer service team

We ensure your towbar and ball & pin accessory are correctly matched to your vehicle and towing needs.