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External Threaded Taper Pins Unhardened ISO 8737 / EN 28 737 / IS 3524 (Part 2) / DIN 7977

External threaded taper pins ISO 8737 / EN 28 737 / IS 3524 (Part 2) / DIN 7977 are specialized fasteners used in various industries to align and secure two or more components together, providing stability and preventing relative movement.


External threaded taper pins ISO 8737 / EN 28 737 / IS 3524 (Part 2) / DIN 7977 are typically made from materials such as carbon steel, stainless steel, or other alloys. They consist of a cylindrical body with external threads at one end running along its length. The pin gradually tapers towards one end, forming a conical shape. The tapered end usually features a chamfer or bevel to facilitate easier insertion into a corresponding tapered hole.

Design and Function:

The design of external threaded taper pins allows them to be inserted into a tapered hole, creating a tight and secure fit. The taper ensures that the pin wedges tightly into the hole, preventing any unwanted movement or rotation.

Installation and Removal:

To install an external threaded taper pin, the smaller diameter tapered end is inserted into the corresponding tapered hole. The external threads provide the means to extract the pins from blind holes where the assembly does not allow the feasibility to extract or knock the pin out from the other end. The threads are typically tapped or machine-cut with precision. The thread type and pitch can and mentioned in the standards ISO 8737 / EN 28 737 / IS 3524 (Part 2) / DIN 7977. In some cases, a specialized tool such as a pin wrench or a pair of pliers may be required to facilitate the removal process.


External threaded taper pins find applications in a wide range of industries, including automotive, aerospace, machinery, and assemblies like dies, jigs, and fixtures. Some common uses include:

Taper Pins find applications such as coupling hubs, gearboxes, and pulleys, suspension systems, steering mechanisms, and linkages, to secure components such as arbors, chucks, and cutting tools.

Advantages: Taper pins can be reused multiple times, reducing the need for frequent replacements and lowering overall costs.

Unhardened External Threaded Taper Pins are precision components that are carefully designed and offer versatility in threaded fastening applications. They comply with ISO 8737, EN 28 737, IS 3524 (Part 2), and DIN 7977 standards. These taper pins have a sturdy, unhardened construction and are designed for situations where moderate strength and flexibility are critical.

These external threaded taper pins are ideal for applications where flexibility is crucial because of their easily machined and adjustable material, which has not hardened. Their tapered shape and lightweight make them more versatile, especially in situations where weight considerations and small adjustments are important.

External threading offers flexibility in assembly processes by guaranteeing a stable and adaptable connection. Adherence to ISO, EN, IS, and DIN standards demonstrates their dedication to accuracy and excellence, guaranteeing dependability in operations. External threaded taper pins that have not been hardened are used in a variety of industries to create reliable and effective assemblies that satisfy global quality and reliability standards.

These taper pins provide a dependable solution for threaded taper fastening needs, whether they are used in machinery, construction, or other diverse applications. They are a great option for projects requiring accuracy and adaptability in external threaded taper connections due to their strength, flexibility, and compliance with international standards.

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About Us

We are an ISO 9001 Certified & reputed manufacturer of Industrial Pins with expertise gleaned over 40 years. We manufacturers these pins according to various standards namely ISO, IS, DIN, BS and also as per customers requirements.