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Grease

Grease Zerks

A Zerk is a Grease Fitting.  It was named after Oscar Zerk who patented the zerk in 1929.  

A zerk is a small hydraulic check valve used on bearings and similar mechanical assemblies to supply lubricant to internal parts.   The valve opens under pressure to allow lubricant to pass through a channel and be forced into the voids of the bearing. When the pressure ceases, the ball returns to its closed position. The ball excludes dirt and functions as a check valve to prevent grease escaping back out of the fitting. The ball is almost flush with the surface of the fitting so that it can be wiped clean to reduce the amount of debris carried with the grease into the bearing.  

The common convex shape of the fitting allows the concave tip of the grease gun to seal against the fitting easily from many angles, yet with a sufficiently tight seal to force the pressured grease to move the ball and enter the fitting, rather than simply oozing past this temporary annular ring-shaped seal. Browse our selection of grease zerks for sale!


Meets SAE J-534C

8000 psi Maximum Pressure

Exceeds 12 Hour Salt Spray

1/8 inch Male Pipe
1/8 inch Male Pipe
1/8 inch Male Pipe 30
1/8 inch Male Pipe 30
1/8 inch Male Pipe 45
1/8 inch Male Pipe 45
1/8 inch Male Pipe 65
1/8 inch Male Pipe 65
1/8 inch Male Pipe 90
1/8 inch Male Pipe 90
3/16 inch Drive Type
3/16 inch Drive Type
1/4 inch Male Pipe
1/4 inch Male Pipe
1/4 inch Male Pipe 65
1/4 inch Male Pipe 65
1/4 inch Drive Type
1/4 inch Drive Type
1/4-28 Straight
1/4-28 Straight
1/4-28 45
1/4-28 45
1/4-28 90
1/4-28 90
5/16 inch Drive Type
5/16 inch Drive Type
5/16-24 Straight
5/16-24 Straight
3/8-24 Straight
3/8-24 Straight
1/8 BSPT
1/8 BSPT
1/8 BSPT 45
1/8 BSPT 45
1/8 BSPT 90
1/8 BSPT 90
6mmX1 Straight
6mmX1 Straight
6mmX1 45
6mmX1 45
6mmX1 90
6mmX1 90
8mmX1 Straight
8mmX1 Straight
8mmX1 45
8mmX1 45
8mmX1 90
8mmX1 90
10mmX1 Straight
10mmX1 Straight
10mmX1 45
10mmX1 45
10mmX1 90
10mmX1 90
Button Head
Button Head
Zerk Coupler
Zerk Coupler
Whip Hose
Whip Hose
Straight
Straight
Coupling
Coupling
45 Elbow
45 Elbow
90 Elbow
90 Elbow
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