Cotter Pin (Split Pin)

Cotter pins are widely used retaining components designed to prevent loosening of nuts, axial movement of shafts, or disengagement of dowel pins.

Featuring a double-prong, forked structure, they are inserted through a hole and bent at the ends to create a secure lock.

Manufactured according to standardized dimensions, cotter pins are suitable for low- to medium-speed shaft locking applications. Their simple design, easy installation, and cost-effectiveness make them a common anti-loosening solution in mechanical equipment and high-volume assemblies.

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Product Features

• Complies with standards: JIS B 1351 / DIN 94

• Installation: Insert through a locating hole and bend both ends to secure against loosening

• Versatile use: Compatible with hex nuts, dowel pins, hinges, sleeves, and other fasteners

• Size range: Ø1.0mm to Ø20mm, custom sizes available upon reques

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Material & Surface Treatment

• Steel (SWRCH / Low Carbon Steel):
  – Good toughness and cost-efficiency
  – Finish: Trivalent zinc plating for corrosion resistance

• SUS304 (Stainless Steel):
  – Excellent rust resistance and hygiene properties
  – Ideal for food equipment, outdoor structures, and electronic devices

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Applications

• Anti-loosening mechanism for machinery hex nuts

• Securing hinges and joints in agricultural and automotive tools

• Detachable connections in fixtures and jigs

• Supplemental anti-fall locking in large assembly components

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Customization & Notes

• Bulk orders supported

• Drawing-based matching and technical confirmation available upon request

Reference Standards

• JIS B 1351 (Japan)

• DIN 94 (Germany)

• GB/T 91 (China)

• ANSI/ASME B18.8.1 (United States)

• CNS 1246 (Taiwan National Standard)