Best Lock on Grease Coupler (2020 Reviews)


The top 3 Lock on Grease Couplers

When you’re working with a grease gun, you need to ensure that the feedline stays connected to the hose. If the coupler loses its grip on the fitting, then the grease will get everywhere, causing a hazard in your workshop that can end in a severe accident.

The coupling between the tip of the gun and the feedline is a critical part of your set up. If you have a tool that operates at 12,000-psi and you link it to a lock-on coupler that can only handle 10,000-psi, you’re asking for an accident to occur in your workshop.

How Does a Lock-On Grease Coupler Work?

A lock-on grease coupler features a sliding sleeve that connects to the fitting on your grease line. The jacket features four steel jaws that clamp onto the zerk fitting. The jaws can hold the fitting to the line at pressures of up to 12,000-psi. The safety pressure rating depends on the model you buy.

The fitting is leak-proof, featuring silicon seals to prevent any backflow from the grease line. The locking head will grip the grease fitting, and you can release it by pressing the thumb lever.

How Do I Select the Right Lock-on Grease Coupler?

When selecting your ideal lock-on grease coupler, you must match the operating pressure on your application with the correct pressure rating on your coupler. Running an 8,000-psi coupler on a 10,000-psi line is a bad idea and can lead to workplace injury.

Make sure that the model you choose has spares available to help you refurbish and maintain the coupler at least once a year. Nitrile seals offer the best sealing and protection during use.

Look for a lock-on grease coupler that works on all fittings, including SAE and metric. Your lock-on grease coupler must be compatible with all leading brands, including Allstar, Alemite, Lumax, Grainger, Plews lubrication, SKF, Macnaught, Milwaukee, John Deere, Legacy, Sealey, and many others.

Our Top Recommended Products

#1st Rated
best grease gun coupler

LockNLube Grease Gun Coupler

Locks on, does not leak

1/8" NPT compatible with all grease guns - battery, pneumatic, manual

Grease goes in, not on, the machine

World's original locking grease coupler.

#2nd Rated

Azuno Grease Gun Coupler

Reinforced jaws and quality sealing gasket ensure long lasting and stable performance, prevent leakage even at 12,000 PSI extreme pressure.

Built with premium quality Zinc Coated Alloy Steelfor for all-day performance in the shop or garage, heavier and stronger than any other grease couplers on the market.

#3rd Rated


Rated to 10,000 PSI! Locks on, stays on. Does not leak once locked on.

Hands free - does not pop off under pressure.

Easily release from fittings with the thumb lever, even at extreme pressure.

Fits all standard Grease Guns - 1/8 NPT fitting. Fits all SAE and Metric Zerk fittings. Simply replace your existing coupler.

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