Cotter pins, also known as split pins, are headless wire-formed fasteners with a split end that bends during installation to lock components in place. They are typically inserted into holes of clevis pins, castellated nuts, or shafts to prevent loosening under vibration and dynamic loads.
Applicable Standards
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DIN 94 / ISO 1234 (Metric standard cotter pins)
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ASME B18.8.1 (Inch series)
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DIN 11024 (Single and double spring cotter pins)
Types Available
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Standard Cotter Pins: Steel, brass, and stainless steel (extended prong with square cut or chisel point)
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Hairpin Cotter Pins (R-Pins): Spring-type with high shoulder design for quick installation
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Locking Cotter Pins: Enhanced retention for demanding applications
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Hammerlock Cotter Pins: Installed by striking the head with a hammer
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Bow Tie / Hammelock Cotter Pins: Specialized configurations
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Cotter Rings: Circular wire-formed locking devices
Materials
Carbon steel (plain or zinc-plated), spring steel, stainless steel (304, 316), brass, and other alloys upon request
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