COTTER PIN

A COTTER PIN is a two-leg retaining fastener formed from metal wire. After being inserted through a hole in a bolt, shaft, clevis pin, or castellated nut, the two legs are bent outward to prevent the connected part from slipping out or rotating. It is commonly used for mechanical connections and safety locking applications.

Product Name: COTTER PIN / Split Pin
Product Structure: Loop-shaped head with two separable legs at the end
Primary Functions: Prevents nuts from loosening, shafts from sliding out, and components from becoming detached
Diameter: Selected according to the mating hole diameter and required load
Length: Selected according to the thickness of the hole location and required bending length
Head Types: Loop head, semi-round head, or other specified forms
End Types: Straight legs, angled-cut legs, or as specified by drawing
Materials: Low-carbon steel, stainless steel, brass, copper, or other specified materials
Surface Treatments: Zinc plating, nickel plating, passivation, black oxide, or other specified finishes
Applicable Standards: DIN, ISO, JIS, ANSI, or customer-specified standards
Production Methods: Wire forming, cutting, and surface treatment
Production Options: Standard specifications or custom production based on drawings
Packaging: Bulk packing, bag packing, or box packing

Category:

Simple and Straightforward Installation

Insert the COTTER PIN through the prepared hole and bend the two legs outward to secure it in place. No threads or special fastening tools are required.

Prevents Components from Becoming Detached

A COTTER PIN can restrict axial movement of castellated nuts, bolts, shafts, and connecting pins, helping prevent components from slipping out during vibration or operation.

Easy to Inspect Visually

After installation, it is easy to visually confirm whether the COTTER PIN has been inserted correctly and whether the legs have been properly bent, making assembly inspection and equipment maintenance more convenient.

Easy to Remove and Replace

During maintenance, the bent legs can be straightened and the pin removed. This makes COTTER PINS suitable for mechanical structures that require periodic disassembly. Replacement with a new pin is recommended if the original pin has become deformed or fatigued.

Wide Range of Applications

COTTER PINS are commonly used in machinery, automotive and motorcycle components, agricultural machinery, construction equipment, furniture hardware, and various linkage assemblies.

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