Cylindrical pins

Design and principle of operation of cylindrical pins

Cylindrical pins are smooth or springy cylindrical metal rods used to fix, center or connect parts in mechanisms. They do not have a thread, they are fastened due to a tight fit in the corresponding hole. This type of fastening guarantees high accuracy and stability of the position of the elements.

The products are smooth, with chamfers, with holes or elastic (spring). The material for production is carbon or stainless steel, sometimes with a coating to protect against corrosion.

Types and sizes of cylindrical pins

Dimensions are determined by diameter and length. The diameter varies from 1 mm to 25 mm. Length — from 4 mm to more than 100 mm. The choice of parameters depends on the design features of the parts and operating conditions.

The correct selection ensures a tight fit without backlash. For elastic pins, the degree of compression is taken into account - this affects the fixation. Price depends on size, standard and material.

Cylindrical pins: manufacturing process

Production begins with the cutting of steel blanks. Next, turning is performed with diameter accuracy control. For spring pins, rolling or forming a spiral is performed. In the final stage — heat treatment and grinding.

Each product is checked for accuracy of fit, hardness and compliance with standards. The result is a precise and durable fastener.

Where cylindrical pins are used

These pins are used in machine tools, gearboxes, couplings, gears, equipment housings. They provide reliable centering, prevent rotation and displacement of parts.

They are also used in the assembly of devices, equipment, and medical equipment. Their precision and simplicity make them popular in any branch of mechanical engineering.

Video about cylindrical pins:

Advantages of buying in Dinmark

1️⃣ Huge selection of fasteners: A unique opportunity to find all necessary fasteners in one place - the largest assortment in Ukraine.
2️⃣ Flexible pricing policy: The more you buy, the lower the price you will get, providing favorable conditions for large orders.
3️⃣ Additional discount: When making a purchase on the website, you automatically receive an additional -2% discount on the entire range.
4️⃣ Fast delivery: Enjoy fast delivery of goods both from the warehouse and to order, ensuring the speed and convenience of receiving purchases.
5️⃣ Expert support: Our team of experts is always ready to help you choose the right mount, guaranteeing professional advice and support.

Questions and answers

Assortment of cylindrical pins

Dinmark has a wide selection of items including:

DIN 1444-B — with a hole for a cotter pin
DIN 1481 — elastic pins (spiral)
DIN 6325 — with a chamfer for exact centering
DIN 7 — classic smooth pins

Each standard takes into account the specifics of application, fit and strength. Cylindrical DIN pins meet international standards and are widely used in industry. 

Which cylindrical pins are the best in their category?

The best ones are those that exactly match the working conditions. Flexible DIN 1481 are suitable for repeated installation. For precise connection - polished DIN 7. In difficult conditions - heat-treated DIN 6325.

How to choose and order cylindrical pins in Dinmark?

Cylindrical pins are selected according to several key parameters. First of all this diameter and length—these must match the hole exactly to ensure a tight fit without play or damage. Next, pay attention to the material: carbon steel - for standard conditions, stainless - for wet or aggressive environments, brass - for light structures. It is also importanthide a manufacturing standard (such as DIN or ISO) that guarantees dimensional accuracy and interchangeability. And finally, look at the installation conditions: for permanent connection — pins without additional elements.

Cylindrical pins that should be bought in 2025?

In 2025, DIN 1481 will remain popular — flexible, wear-resistant, conveniently mounted. DIN 6325 is also recommended for responsible fastening in production. They combine accuracy, reliability and ease of installation, so you should determine your needs and buy Cylindrical pins.