Shop Cotter Pins Online at South Coast Fasteners

South Coast Fasteners, Inc. provides cotter pins engineered to keep fasteners, clevis pins, and mechanical assemblies locked securely in place. Built for reliability and long-term performance, these split pins prevent nuts and bolts from loosening under vibration, stress, or heavy loads. Designed for simplicity and strength, cotter pins deliver dependable retention where safety and performance can’t be compromised.

Used across automotive, agricultural, construction, and industrial sectors, cotter pins are trusted for both maintenance and production. Their quick installation and removal make them ideal for assembly lines, repair shops, and field service work. South Coast Fasteners stocks cotter pins in multiple materials, diameters, and lengths to ensure lasting reliability across every industry.

Affordable Fasteners That Deliver Strength and Performance from South Coast Fasteners

If you're looking for a trusted supplier of wholesale industrial fasteners, South Coast Fasteners is your solution. Contact our Anaheim, CA office to learn more about our product options and how we can support your project needs. For helpful service, fast order turnaround, and high-quality fasteners in bulk or small batches, choose South Coast Fasteners.

Types of Cotter Pins

Extended Prong Square Cut Cotter Pins (Zinc CR+3, Carbon Steel)

Extended prong square cut cotter pins are built for quick, secure fastening where durability and easy removal both matter. Their longer prongs allow for more reliable retention in larger assemblies, while the square cut ends provide a cleaner fit and stronger hold once bent into position. The zinc CR+3 plating protects against rust and oxidation, making these pins a trusted choice in agricultural, industrial, and mechanical maintenance applications.

Carbon Steel Cotter Pins (Zinc CR+3)

Carbon steel cotter pins offer dependable locking strength and everyday practicality. The zinc CR+3 finish enhances corrosion resistance while maintaining a smooth surface for easy installation and removal. Commonly used to secure clevis pins, castle nuts, and shafts, these pins provide strong mechanical retention under vibration and load. They’re an affordable, durable choice for general construction, machinery, and vehicle assembly work.

Stainless Steel Cotter Pins (SS300 Series)

Stainless steel cotter pins provide superior corrosion resistance for environments where moisture or chemicals are present. Made from SS300 series stainless, they retain flexibility while resisting rust, making them ideal for marine, food service, and outdoor equipment applications. Their non-reactive nature and long lifespan make them the go-to option for demanding industries that prioritize reliability over replacement.

Clevis Pin and Cotter Pin Combinations (Plain)

Clevis and cotter pin combinations create a complete fastening solution that allows rotational movement while maintaining a secure mechanical link. The clevis pin provides the pivot, and the cotter pin locks it in place, ensuring stable operation even under dynamic loads. The plain finish keeps tolerances tight and installation simple, making this combination ideal for agricultural machinery, linkage systems, and adjustable mechanical assemblies.

Cotter Pins - Material Options

South Coast Fasteners stocks cotter pins in several material options suited for locking, securing, and fastening applications across mechanical, automotive, and industrial use. Whether you're pinning a clevis, anchoring hardware, or securing shafts and components, our cotter pins are built for strength and reliability across a variety of environments.

Stainless Steel 18-8

A versatile and corrosion-resistant material for most general-purpose applications. 18-8 stainless steel cotter pins offer a clean finish and long-lasting durability, especially in mildly corrosive environments such as indoor assembly work, HVAC systems, and general manufacturing. They're ideal where both appearance and strength matter.

Stainless Steel 300

This broader classification of stainless steel includes multiple grades designed for strength and resistance to oxidation and moisture. Stainless 300-series cotter pins provide added resistance in damp or semi-corrosive conditions, making them a go-to in outdoor assembly, marine equipment, and structural applications that demand non-rusting performance.

Steel

Steel cotter pins are cost-effective and widely used in everyday fastening and retaining tasks. With a strong base material that holds its shape under stress, plain steel cotter pins are ideal for non-corrosive indoor environments or temporary assemblies where value and rigidity are more important than weather resistance.

Cotter Pins - Available Finishes

Each finish is designed to meet different performance standards, from rust protection to visual consistency. South Coast Fasteners offers cotter pins in:

Plain

A raw, uncoated finish best for dry environments or when the pin will be coated or painted after installation. Plain cotter pins are easy to bend and install, commonly used in machinery, light automotive work, and general-purpose equipment.

Zinc CR+3

This finish adds a layer of corrosion resistance with a clean, silver appearance. Zinc-plated cotter pins are a popular choice for hardware exposed to light moisture, mild chemicals, or general outdoor use. The coating protects the steel beneath from rusting prematurely, extending the life of the assembly

Why Choose South Coast Fasteners?

South Coast Fasteners offers cotter pins in a variety of materials and finishes to provide lasting, dependable fastening. Whether you’re working on machinery, trailers, or structural assemblies, we have the sizes and quantities you need to keep everything secure.

Shop Cotter Pins Online at South Coast Fasteners

Ordering cotter pins is easy with South Coast Fasteners. Browse our online inventory or reach out if you need help with sizing or choosing the right fit. We’re here to help you lock your components in place with confidence.