Hydraulic grease fittings are essential components in any hydraulic system as they help to transfer the lubricant from one point to another. The quality and type of fitting used can significantly affect the performance of the entire system. In this review, we will be discussing various types of hydraulic grease fittings available on the market and their features. Hilitchi 145-Pcs Metric Standard Brass Hydraulic Grease Fitting Assortment Kit – Straight, 90-Degree, 45-Degree Angled Zerk: This is a comprehensive assortment kit that includes various types of hydraulic grease fittings. The straight and angled zerks are made of brass and have a metric thread size. They also come with an ABN Grease Fitting Tool, which makes it easy to install the fittings without damaging them. KOOTANS 145pcs M6 M8 M10 Male Thread Steel Zerk Straight and 90 Degree Angled Grease Nipple Fitting Assortment Kits: This assortment kit includes various sizes of zerks for different thread types. The straight and angled zerks are made of steel and have a metric thread size. They also come with an Easy Out Zerk Fitting Tool, which makes it easy to remove the zerks without damaging them. Grease Fitting Thread Tester: This tool is used to test the thread size of hydraulic grease fittings. It has a digital display that shows the thread size and type. It also includes various adapters for different types of threads. Lincoln G904 Fitting: This fitting is made of brass and has a metric thread size. It is designed to be used in hydraulic systems with high pressure requirements. Lumax LX-3301-10 Gold/Silver 6mm x 1mm Taper Metric Thread Straight 0.60" Long Grease Fitting, (Pack of 10): This fitting is made of gold or silver and has a metric thread size. It is designed to be used in hydraulic systems with low pressure requirements. Swordfish 41091-110pcs Metric Grease Fitting Grease Zerk Assortment: This assortment kit includes various sizes of zerks for different thread types. The straight and angled zerks are made of brass and have a metric thread size. They also come with an ABN Grease Fitting Tool, which makes it easy to install the fittings without damaging them. LDEXIN 20pcs M10 Straight Hydraulic Grease Fitting Assortment Kit Zerk Fitting Nipple Nozzle Fitting 10mm x 1mm Male Thread: This assortment kit includes various sizes of zerks for different thread types. The straight and angled zerks are made of steel and have a metric thread size. They also come with an Easy Out Zerk Fitting Tool, which makes it easy to remove the zerks without damaging them. COMOK Hydraulic Grease Fitting Kit: This fitting is made of brass and has a metric thread size. It is designed to be used in hydraulic systems with high pressure requirements. 20Pcs M6(1/4") Male Thread Straight Zerk Grease Nipple Accessories, Silver Tone: These accessories are made of silver tone and have an M6 thread size. They can be used as zerks or nipples in hydraulic systems with low pressure requirements. Silver Tone 10mm x 1mm Taper Metric Thread 90 Degree 0.75" Long Grease Fitting, (Pack of 10): This fitting is made of silver tone and has a metric thread size. It is designed to be used in hydraulic systems with low pressure requirements. In conclusion, hydraulic grease fittings are an essential component of any hydraulic system. The quality and type of fitting used can significantly affect the performance of the entire system. When choosing hydraulic grease fittings, it is important to consider the thread size, material, and pressure requirements of your system.