What Are the Specifications and Models of Grease Fittings?
3 Answers
Common types of grease fittings: Straight pressure grease fittings M6M10×1. Angle pressure grease fittings M645°M10×145°. Each nominal diameter corresponds to an outer diameter, with the inner diameter varying according to thickness. Pipes are categorized into imperial and metric pipes. For a pipe with a nominal diameter of DN100, if it belongs to the international standard series (commonly known as imperial pipe), its outer diameter is 114.3mm. Below are precautions for cleaning grease fittings: Monthly greasing: It is best to apply grease once a month. Otherwise, if the shaft pin rusts completely and becomes immovable, it is usually due to the operator not applying grease diligently. Sealing gaps tightly: Sand, gravel, and other debris from construction can enter the gap between the oil seal and the pin sleeve. Generally, the gap should be tightly sealed with wire, plastic hose, or inner tube. Clean before assembly: Remove impurities, gravel, and dust before installing the new replacement parts.
I often encounter various types of grease fitting specifications when repairing cars, and there are quite a few of them. Common thread sizes include M6, M8, and 1/4 inch, which are basic dimensions. For example, M6 is smaller and suitable for delicate components, while M8 is more commonly used in suspension systems. There are also button-type and straight-through types. Button-type fittings allow for easy oil injection with a simple press, making them convenient to use but prone to clogging. Straight-through types require pressure tools but are more durable. Specifications often refer to DIN or SAE standards, with DIN 71412 being quite popular. Using the wrong size can be problematic—if an oversized fitting is installed, oil may leak quickly and unevenly, affecting the lifespan of the suspension and bearings. For older models on the car, it's best to check the repair manual or measure the thread size. Parts stores often sell kits containing multiple sizes for testing, saving unnecessary trips. During regular maintenance, cleaning dust when replacing fittings is crucial to avoid clogging the channels, which can reduce efficiency and potentially damage components, leading to significant losses.
I always find these small parts crucial when driving a new car. The sizes of lubrication points vary, including small, medium, and large: small ones like M6 are suitable for compact areas like door hinges, medium M8 is commonly used on the chassis, and large 1/4-inch ones correspond to heavy-duty components. The button-type ones are the most convenient—I replaced a few myself, but you must be careful not to let them get dirty, otherwise they may jam and not operate smoothly. To find the right specifications, just pick them at the parts market—the staff can measure the size accurately for you; buying sets online is cheaper and more cost-effective. Choosing the right nozzle ensures even lubrication without leaks, saving you from repeated oiling. When driving normally, the suspension system stays well-protected, making bumps feel smooth and ensuring safe, stable driving. By the way, upgrading to high-quality nozzles during old car maintenance can extend its lifespan—get it done once and avoid frequent hassles.
