Best 3 Oz Grease Gun: 5 Mini Picks (2026)

Compare the picks

Specifications are manufacturer rated, as published on each listing and collected 20 October 2026. “Not stated” means the listing does not give the figure.

How we scored them

Scores run from 9.2 to 9.8: each product’s point total is placed on that range, so more points always means a higher score. Safety counts only for powered gear or where the listing states safety features; where it does not apply, the score is taken over the remaining 90 points.

What the listings tell you

We read five mini grease gun listings. One states a pressure of 4,400 PSI; two state 3,000 PSI; two state no pressure figure. Three include a 12-inch flexible hose. Only one states a warranty term, a 90-day limited warranty, and none states a safety listing.

How to pick the best 3 oz grease gun

Pressure

Stated maximums: the Plews at 4,400 PSI, the SHALL and KRETLAW at 3,000 PSI each, and no figure stated on the Legacy or LockNLube. The Plews also states 0.5 oz per 40 strokes. For stubborn fittings, the Plews states the most pressure; for routine greasing, the SHALL and KRETLAW state enough.

Couplers and hose

The LockNLube’s stated claim is its patented coupler that locks on and stays on, with a 12-inch heavy duty hose and in-line hose swivel. The SHALL states 2 four-jaw couplers, a 12-inch spring flex hose, long and short extension pipes and a sharp nozzle. The KRETLAW states a 4-jaw coupler, a 12-inch spring flex hose, an extension pipe and a sharp nozzle. The Legacy states a high-pressure 4-jaw coupler with a 12-inch flexible extension and a 4-inch rigid extension. The Plews states a 5-1/2-inch steel straight pipe. For hard-to-reach fittings, the SHALL’s stated pipe set is the most complete.

Loading

All five take 3 oz cartridges. The Plews states 2-way loading: 3 oz cartridges or suction load. The SHALL states a 3 oz cartridge of grease in the kit; the KRETLAW states two 3 oz cartridges. The Legacy states cartridge loading with a chrome finish. The LockNLube states it uses 3 oz grease tubes and fits easily into toolboxes.

Kit contents

The SHALL states the fullest kit: gun, 2 couplers, sharp nozzle, extension adapter, 3 oz grease, reinforced glove and zerk fitting cleaner. The KRETLAW states gun, 2 cartridges, coupler, sharp nozzle, adapter and gloves. The Plews states gun, pipe and a 3 oz marine grease cartridge. The LockNLube states gun, coupler, hose and swivel. The Legacy states gun, flexible and rigid extensions.

Warranty

The Plews states a 90-day limited warranty, the only stated term here. The SHALL, Legacy, LockNLube and KRETLAW state no warranty term.

Grip style: pistol versus trigger

What each listing states

The SHALL states a small pistol grip grease gun with an ergonomic handle in anti-slip texture. The KRETLAW states a pistol grip gun with an ergonomic anti-slip handle. The Legacy states a pistol grip type in its spec table. The Plews states a smooth and easy-to-pull trigger for precise lubrication. The LockNLube states no grip figure. For one-handed greasing in a tight bay, the pistol grip picks are the stated form; for metered shots, the Plews’ stated trigger is the stated alternative.

Priming and smooth flow

The Legacy states a durable follower, rod and spring for consistent priming. The SHALL states a thick pull rod of T-handle with a strong spring and high-pressure plunger O-ring for extremely smooth grease injection. The KRETLAW states the same T-handle pull rod, powerful spring and high-pressure plunger O-ring combination for ultra-smooth injection. The Plews and LockNLube state no priming mechanism. For a gun that keeps its prime between uses, the Legacy, SHALL and KRETLAW state the mechanism; the other two leave it unstated.

Weight and portability

Stated weights

The LockNLube states 1.11 lb. The Plews states 16 ounces. The Legacy states 1.75 lb in its spec table (1.52 lb item weight). The SHALL states 1.89 lb. The KRETLAW states 2.03 lb. The LockNLube also states it fits easily into toolboxes or storage compartments. For a toolbox gun you carry to the fitting, the LockNLube’s stated 1.11 lb is light; the KRETLAW’s stated 2.03 lb is the heaviest of the five.

Build materials

The SHALL states premium quality durable die cast aluminum construction. The KRETLAW states heavy-duty die-cast aluminum. The Legacy states heavy-duty die-cast head construction with a chrome finish. The Plews states all metal construction. The LockNLube states painted steel and rubber exterior. All five state metal bodies; none states a plastic body.

Coupler design per listing

Four-jaw and lock-on

The SHALL states 2 four-jaw couplers in the kit. The Legacy states a high-pressure super grip 4-jaw coupler. The KRETLAW states a reinforced 4-jaw coupler. The LockNLube states its patented grease coupler that locks on, stays on and will not leak. The Plews states no coupler design figure. For a coupler that stays attached under pressure, the LockNLube’s stated lock-on design is the named feature; for spares, the SHALL states two couplers in the box.

Accessories for tight fittings

The SHALL states a sharp nozzle, an extension adapter and a zerk fitting cleaner, plus a pair of reinforced PVC gloves. The KRETLAW states a sharp nozzle, an extension adapter and a pair of reinforced PVC gloves. The LockNLube states a 12-inch heavy duty hose with an in-line hose swivel. The Legacy states a 12-inch flexible extension and a 4-inch rigid extension. The Plews states a 5-1/2-inch sturdy steel straight pipe. The SHALL’s stated zerk fitting cleaner is unique here: it cleans the fitting before the coupler goes on.

Grease and compatibility

What grease each states

The SHALL states a 3 oz cartridge of grease in the kit and lithium material. The Plews states a 3 oz LubriMatic corrosion control marine grease cartridge, aimed at trailer wheel bearings. The KRETLAW states two 3 oz grease cartridges. The Legacy and LockNLube state no grease included. For marine or trailer bearings, the Plews’ stated marine grease cartridge is the named pick; for general chassis work, the SHALL and KRETLAW state standard cartridges.

Vehicles and fittings named

The SHALL states suitability for vehicles, tractors, RVs, automobiles, PTO axles, steering cylinders, universal joints, suspension tie rods, ball joints, lawn mowers, chassis and driveshafts. The KRETLAW states the same range. The LockNLube states no vehicle list. The Legacy states 3 oz cartridge loading for general use. The Plews names trailer wheel bearings. For farm equipment with many zerks, the SHALL and KRETLAW state the widest named application range.

Frequently Asked Questions

Which states the most pressure?

The Plews at a stated 4,400 PSI. The SHALL and KRETLAW state 3,000 PSI; the Legacy and LockNLube state no figure.

Which include a 12-inch hose?

The SHALL, Legacy and LockNLube state a 12-inch hose or flexible extension. The Plews states a 5-1/2-inch steel pipe.

Which state a warranty?

Only the Plews, at a stated 90-day limited warranty. The other four state no warranty term.

Which include grease in the kit?

The SHALL states a 3 oz cartridge, the KRETLAW states two 3 oz cartridges, and the Plews states a 3 oz marine grease cartridge. The Legacy and LockNLube state no grease included.

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