What thread has a grease nipple?

Grease nipples might seem small, but they play a crucial role in the smooth operation of machinery and vehicles. These tiny yet powerful components are designed to deliver lubrication precisely where it's needed—making them an essential part of maintenance routines in industries like construction, agriculture, and manufacturing. Whether it’s a thread lubricant or a drive-in grease nipple, their simple yet effective design ensures reliable performance under tough conditions.

Drive-in grease nipples are typically installed using a hammer and some force. However, most of them also feature a threaded connection. This detail becomes important when you need to replace the grease nipple. To avoid confusion and ensure a proper fit, it's helpful to know the type and size of the thread. Below, we’ve gathered all the key information to guide you through the process of identifying and selecting the right thread tap for your grease nipple.

The Role of Threads on Grease Nipples

Like any mechanical component, grease nipples require occasional maintenance. They are often exposed to dirt, moisture, and harsh environments, which can lead to wear over time. Regular cleaning or replacement is necessary, and that’s where the thread comes into play. The thread provides a secure and stable connection, allowing the grease nipple to be easily removed and reinstalled without damage. It also helps maintain a tight seal, ensuring that lubrication is delivered efficiently and consistently.

Thread Type Depends on the Grease Nipple Design

While it would be ideal if each grease nipple had a standardized thread, the reality is more complex. Different types of grease nipples come with different thread styles, so it’s important to identify the type first. This gives you a starting point for determining the correct thread size and type.

Common Types of Grease Nipples

There are several designs available, but three types are most commonly used:

• Cone grease nipples (DIN 71412)
• Flat grease nipples (DIN 3404)
• Funnel grease nipples (DIN 3405)

Among these, cone grease nipples are the most widely used due to their rounded head design. Flat grease nipples have a flat head, while funnel grease nipples feature a funnel-like shape. Understanding the type helps in identifying the corresponding thread style.

Cylindrical vs. Conical Threads

Once you know the type of grease nipple, you can determine whether it has a cylindrical or conical thread. Cone grease nipples usually have a conical (tapered) thread, while flat and funnel types typically use a cylindrical thread. This distinction is key when selecting the right thread tap for replacement or repair.

Common Thread Standards in Germany

In Germany, metric threads are the most common, but imperial threads may also appear, especially in older or imported equipment. Knowing the difference between metric and imperial threads is essential for accurate identification.

Metric Threads on Grease Nipples

Metric threads are the standard in many applications. Two main types are used:

Conical Metric Thread

This type follows DIN 158 and features a 60° flank angle with a taper of 1:16. A typical designation might be M 6x1.0 keg, where "keg" indicates a conical thread.

Cylindrical Fine Metric Thread (MF)

Cylindrical threads are usually fine metric threads (MF), also with a 60° flank angle. The designation includes the nominal diameter and pitch, such as M 8x1.0.

Imperial Threads on Grease Nipples

Imperial threads are commonly found in older systems or international equipment. They include:

BSP (British Standard Pipe Parallel) Threads

Also known as BSPP, this is a cylindrical pipe thread used in the UK. It’s designated by BSP followed by the nominal diameter in inches, such as BSP 1/4."

R (BSPT) Conical Pipe Threads

These are conical Whitworth threads, designated by R followed by the outside diameter, like R 1/4".

International Thread Variations

Beyond German standards, there are several other thread types used globally. For example, in the U.S., you may encounter UNF (Unified National Fine), UNEF (Unified National Extra Fine), and NPTF (National Pipe Taper Fuel) threads. These are often found on American-made equipment, and knowing them is crucial when working with foreign components.

How to Identify the Correct Thread Tap

To find the right thread tap for your grease nipple, follow these steps:

1. Identify whether the thread is conical or cylindrical.
2. Determine the pitch by comparing it to a known screw or using a thread gauge.
3. Measure the outside diameter using a caliper or ruler.

If you work with grease nipples regularly, consider using an identification aid—a disc with various thread patterns that allows you to test the fit. Alternatively, self-tapping grease nipples can simplify the process by creating the thread as you install them.

At BAER, we offer a wide range of thread taps tailored to every type of grease nipple. Whether you're replacing a worn-out component or upgrading your tools, we’re here to help. Explore our online shop today and find the perfect match for your needs!