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Taper Pins Soft or Unhardened - ISO 2339 / EN 28 734 / IS 6688 / DIN 1

Taper pins are commonly used mechanical fasteners designed to secure two or more components together. They are versatile, reliable, and widely employed in various industries, including automotive, aerospace, construction, textile manufacturing.

  1. Design and Construction:

Plain taper pins are simple, cylindrical pins with a gradual taper of 1:50 along their length. They are typically made of durable materials such as steel, stainless steel which offer high strength and corrosion resistance. The taper is uniformly distributed along the pin’s length, starting from a larger diameter and gradually reducing to a smaller diameter. Metric Taper pins are defined by their smaller diameter whereas inches Taper Pins are specified by the larger diameter.


  1. Types of Taper Pins:

There are two primary types of Taper pins: Plain or Solid Taper Pins – they are usually supplied in unhardened condition and Internal Threaded Taper pins – available with Internal or External Threads for extraction from blind holes.

Another classification could be according to the standards namely Taper Pins Soft Or Unhardened ISO 2339 / EN 23 339 / IS 6688 / DIN 1 / BS 46 / ASME B18.8.2, etc.

American or British standards also have Number series sizes: No,1, 2, 3, 4, etc. for in between inches sizes. Higher numbers indicate larger dimensions.

  1. Applications:

Plain taper pins are utilized in various applications, including:

– Aligning and joining machine parts: They are used to align and connect rotating shafts, gears, pulleys, and other components.

– Securing handles: Taper pins are commonly employed to secure handles on tools, equipment, and machinery.

– Fastening hubs and wheels: They are used to attach wheels, gears, and pulleys to shafts, providing a secure and reliable connection.

– Locking bolts: In certain applications, taper pins are used to lock bolts in place, preventing them from loosening due to vibrations or movement.

  1. Installation Methods:

To install a Taper pin, the following steps are typically followed:

  1. Drilling & Reaming: Create a hole in the component(s) you want to join, with a diameter slightly smaller than the smaller end of the taper pin. Next pass a tape
  2. Insertion: Align the taper pin with the hole and gently tap it into place using a hammer or mallet. The pin should be driven in until the large end is flush with the surface of the component.

3. Advantages:

Plain taper pins offer several advantages that contribute to their widespread use:

  • Simplicity
  • Reusability
  • Alignment
  • Strength
  • Versatility

The materials used in the production of taper pins that meet ISO 2339, EN 28 734, IS 6688, or DIN 1 standards are usually soft or unhardened. These standards do not require any particular hardness level; instead, they outline the dimensions, tolerances, and general requirements for taper pins. Carbon steel and other similar materials are frequently used to make taper pins soft or unhardened because they offer adequate strength and machinability for a variety of uses.

The choice to employ non-hardened materials for taper pins soft or unhardened stems from the knowledge that in some applications, the pins might not be exposed to high loads or severe wear circumstances. This option provides a snug fit, is cost-effective, and can be machined easily without sacrificing the functionality of taper pins that assemblies require.

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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.