ISO 8750:2007

Overview

ISO 8750:2007 is an international standard that specifies the characteristics of coiled, standard duty spring-type straight pins. These pins are manufactured from steel or from austenitic or martensitic stainless steel, with nominal diameters ranging from 0.8 mm to 20 mm inclusive. This third edition of the standard updates and replaces the previous 1997 edition, providing clear guidelines for dimensions, materials, mechanical properties, and application requirements.

Spring-type straight pins under ISO 8750:2007 are widely used fasteners designed to provide reliable removable assembly joints through their resilient and self-retaining properties. The specification covers pins intended for medium duty applications-distinct from related standards for heavy and light duty spring pins (ISO 8748 and ISO 8751).

Keywords: ISO 8750, spring-type straight pins, coiled pins, standard duty, steel pins, stainless steel pins, fasteners standard, pin dimensions, spring pins application.

Key Topics

• Material Specifications:
  Pins are made from steel or austenitic/martensitic stainless steel with defined chemical compositions and hardness levels according to ISO 6507-1. The standards ensure mechanical strength and resistance to corrosion, suitable for a variety of environmental conditions.

• Dimensional Requirements:
  The standard defines nominal diameters from 0.8 mm to 20 mm, with precise dimensional tolerances before and after mounting. Swaged chamfers appear on both ends of the pins to facilitate assembly.

• Mechanical Properties:
  Minimum shear strength values are established to guarantee performance under load. Pins must pass shear tests in accordance with ISO 8749 to confirm acceptability.

• Surface Treatment and Finish:
  Pins are generally supplied in a natural finish with protective lubricant unless otherwise specified. Special care is advised regarding coatings to avoid hydrogen embrittlement-electroplating or phosphate coating requires post-plating baking treatment per ISO 4042.

• Application and Installation:
  The hole diameter for pin insertion is critical and must conform to tolerance class H12 (or H10 for pins ≤1.2 mm diameter) as specified by ISO 286-2 to ensure proper fit and function.

• Workmanship:
  Pins shall be free of burrs or defects to avoid assembly issues and ensure reliability.

Applications

ISO 8750 coiled spring-type straight pins are essential components in mechanical assemblies where moderate strength retention and shock absorption are required. Common applications include:

• Automotive and Transportation:
  Used in fastening assemblies for engines, transmissions, and suspension parts requiring self-retaining pins with vibration resistance.

• Machinery and Equipment:
  Ideal for securing rotating components, gears, and shafts that demand reliable shear strength and ease of installation/removal.

• Aerospace and Defense:
  Preferred for applications demanding corrosion resistance and standardization to maintain safety and quality.

• Consumer and Industrial Products:
  Utilized where removable but secure fastening is necessary, such as in electronics, appliances, and tools.

The versatility of ISO 8750 pins supports their use in manufacturing processes requiring consistent, standardized fasteners that improve assembly efficiency and long-term durability.

Related Standards

ISO 8750:2007 works in conjunction with several international standards to cover the full spectrum of spring-type pins and fastener requirements:

• ISO 8748: Spring-type straight pins - Coiled, heavy duty
• ISO 8751: Spring-type straight pins - Coiled, light duty
• ISO 286-2: ISO system of limits and fits - Standard tolerance grades and limit deviations
• ISO 3269: Fasteners - Acceptance inspection
• ISO 4042: Fasteners - Electroplated coatings (hydrogen embrittlement considerations)
• ISO 8749: Pins and grooved pins - Shear test

Together, these standards ensure comprehensive guidance for selection, testing, quality control, and application of spring-type pins in industrial settings.

Adhering to ISO 8750:2007 guarantees that coiled, standard duty spring pins meet high-quality benchmarks in performance, consistency, and safety, facilitating their global use as dependable fastening components across diverse sectors.