The ISO 13337 "Spring-type straight pins - Grooved, light-duty" standard, published by the International Organization for Standardization (ISO), describes the specifications for light-duty, slotted spring-type straight pins made of steel or austenitic or martensitic stainless steel, with nominal diameters between 2 mm and 50 mm (inclusive). The nominal diameters are chosen so that the pins can be nested or combined with heavy-duty pins in accordance with the ISO 8752 standard.
In practice, the diameter of the hole into which the spring pin is inserted must be equal to the nominal diameter of the counter pin and have a tolerance class of H12. When mounted in the smallest permissible hole, the socket should not be completely closed.
In the world of mechanical engineering and manufacturing, fasteners play a vital role in ensuring the integrity and functionality of assemblies. Among these, spring pins (also known as roller pins or slotted pins) offer a reliable and tamper-resistant method for joining components without the need for threading or complex assembly tools. The ISO 13337 standard addresses the design and specifications of slotted spring-type flat pins, specifically designed for light-duty applications.
This standard provides engineers, manufacturers, and procurement specialists with precise guidelines to ensure consistency, quality, and interoperability across global supply chains. It replaces previous national equivalents, such as the German DIN 7346 standard, and promotes uniformity in an industry where even small deviations can lead to failures. Today, this standard remains a cornerstone of light-duty connection solutions in sectors such as automotive, electronics, and consumer goods.
The ISO 13337 standard defines the specifications for slotted spring-type straight pins, made of steel or austenitic/martensitic stainless steel, optimized for light-duty use. These pins have a cylindrical shape with a longitudinal groove that allows them to clamp when inserted into a slightly smaller hole. The spring-like flexibility of the pin provides a secure friction fit, resistant to vibration and shear forces, by applying radial pressure to the hole walls.
This standard covers pins with nominal diameters ranging from 2 mm to 50 mm, making it versatile for everything from small-scale electronic devices to larger machine components. It distinguishes itself from heavier-duty standards such as “ISO 8752 Spring-type flat pins – Grooved, heavy-duty” for helical spring pins or “ISO 13336 Leather – Upholstery leather specifications – Guide to selecting leather for furniture” for slotted heavy-duty pins, with an emphasis on light-duty performance. Key considerations include material properties, dimensional tolerances, and performance requirements to withstand typical operational stresses without permanent deformation.
This standard replaces and supersedes the “DIN 7346 Light-duty grooved spring pins (roll pins)” standard, reflecting advances in manufacturing precision and materials science. This standard integrates seamlessly with the Machinery Directive 2006/42/EC.
The ISO 13337 standard essentially offers a table-based sizing approach that ensures pins conform to standard hole sizes while maintaining their elasticity. Its key features are as follows:
Materials must meet minimum stiffness requirements (e.g., Rockwell B scale according to ISO 6507-1 standard) to balance ductility and strength. Common grades include A2-50, A2-70, A4-80, and higher-strength options such as 10.9 or 12.9 for specific needs.
For example, a 6 mm diameter pin might have a compressed diameter of 5,8 mm and lengths ranging from 24 mm to 72 mm. Tolerances are tight to ensure consistent performance (e.g., plus/minus 0,05 mm for smaller sizes).
ISO 13337 standard grooved spring pins perform excellently in light-duty scenarios where permanent fastening is not required and allow for easy removal when necessary. Common applications include:
Their advantages over solid dowels or screws are as follows:
In high-volume production, these pins contribute to lean manufacturing by speeding up assembly lines, with placement times per pin typically under 5 seconds.
In conclusion, the ISO 13337 standard defines precise parameters for light-duty spring-loaded pins, enabling safer and more efficient designs across industries. As manufacturing evolves towards sustainability and automation, these fasteners literally continue to stand out. For those working in design or procurement, adhering to this standard is a crucial step towards ensuring durability.
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