Pintle Eyes & Rings

Pintle Eyes and Ring Couplings

Pintle eyes (lunette rings) and ring couplings form a heavy-duty towing system widely used in commercial, agricultural, construction, and military applications.

They are designed to handle significantly higher loads and offer greater articulation over uneven terrain than standard ball couplings.

This setup consists of two main parts:

• Pintle Hook: Mounted on the tow vehicle, this robust hook features a locking mechanism.
• Ring Coupling (Pintle Eye / Lunette Ring): A strong metal ring attached to the trailer’s A-frame or drawbar that fits securely over the pintle hook

Various pintle tow eyes and trailer ring couplings, from fixed to swivel couplings, are available.

Importantly, the rated D-value is used to select the correctly sized ring coupling.

Disastrous results occur when rigs are unbalanced. We do not recommend DIY techniques when owners are balancing their rigs.

Towing rings quickly wear out due to improper weight distribution on the trailer. Excessive downforce causes excessive wear; therefore, V-Value is a crucial factor.

The V-Value for a tandem trailer should be 6-7%, and 10% for a single-axle trailer.

When excessive weight is added to the downward force (V-Value), significant damage occurs to both connected devices, reducing the product’s life.

How to measure the Ring Coupling head weight?

Drive your truck and trailer onto a weighbridge and measure the weight.

Disconnect the trailer and measure the weight.

Measure the difference in the coupling head weight using this device.

Finally, an excavator’s accidental misplacement will cause severe equipment wear.