This post contains affiliate links. As an Amazon Associate we earn from qualifying purchases.
Our picks are based on Amazon bestseller rankings, verified customer ratings, and product availability. We update our recommendations regularly to ensure accuracy.
Cotter pins are small but mighty components essential for securing nuts, bolts, and other fasteners against vibration and loosening. Ensuring you select the correct type and size is crucial for maintaining the integrity and safety of various automotive applications. The right cotter pin prevents critical parts from disengaging, safeguarding your vehicle and its occupants.
Sufficient quantity:You will receive 120pcs cotter pins and packed in the exquisite plastic box,including M1.6x25-30pcs, M2.5x25-30pcs, M2.5x30-20pcs, M3.2x30-20pcs, M3.2x40-10pcs, M4x60-10pcs
Material: Our cotter pins are made of premium 304 stainless steel, ensuring durability and long-lasting performance. (304 stainless steel belongs to austenitic stainless steel. Austenite is partially or slightly transformed into martensite during cold...
Assortment of Sizes: This cotter pin set includes 6 different sizes, providing versatility and meeting various needs for securing bolts and pins in mechanical applications.
Smooth Surface: The cotter pins feature a smooth surface finish, minimizing the risk of snags or damage to the surrounding components.
Strong and Reliable: These cotter pins are designed to withstand heavy loads and provide secure fastening, ensuring the safety and reliability of your machinery or equipment.
PREMIUM QUALITY: The LRVOJUY cotter pin assortment kit is made of high-quality 304 stainless steel, which is strictly polished and has a smooth burr-free surface, to ensure that the product is durable and won't rust or corrode even after long-term use.
SIMPLICTY AND RELIABILITY: Cotter pins provide excellent performance, easy removal, and installation. Cotter pins are structurally stable and provide reliable connection and fastening features.
CONVENIENT STORAGE: Cotter pins are sorted and sorted in a sturdy, organized storage box with easy-to-read size markings. The cotter pin assortment includes both small cotter pins and large cotter pins.
WIDELY USED: Cotter pins are widely used in machinery, automobiles, lawn mowers, trailers, hitch pin lock systems, trucks, tractor, bolts, marine & handmade DIY.
WHAT YOU GET: 13 Sizes cotter pin assortment. Hairpin cotter pins, M1.6×25mm-40PCS, M2.5×25mm-20PCS, M2.5×30mm-20PCS, M3.2×30mm-16PCS, M3.2×40mm-16PCS, M4.0×50mm-8PCS; R clips hardware pins, M1.0×16mm-35PCS, M1.2×21mm-25PCS, M1.6×28mm-15PCS...
Material: Made of premium 304 stainless steel, with smooth surface and no burr, it has good corrosion resistance, rust resistance, stability and durability
Product features: The cotter pin can be directly inserted into the hole to quickly and safely fix all kinds of nuts and bolts, which can prevent the relative rotation of nuts and bolts and is easy to install and disassemble
Convenient & practical: Cotter Pin Assortment Kit is packed in a reusable box with easy-to-read size labels, which is easy to carry and manage and can meet your different needs
Widely used: Widely used for fixing bolts and pins, such as automobile machinery, lawn mower, machinery, workshop, truck, small engine repair and so on
Packaging includes: There are 13 sizes in the cotter pin clamp combination kit, totaling 220pcs(Please refer to the picture for detailed dimensions). Hairpin Cotter Pin(133pcs): M1.5x25mm x 45pcs, M2.5x25mm x 25pcs, M2.5x30mm x 20pcs, M3.2x30mm x 20pcs...
【304 STAINLESS STEEL】：Made from 304 stainless steel for good corrosion resistance and dependable everyday performance in garages, workshops, and outdoor equipment applications. The smooth silver finish is suitable for routine fastening, replacement...
【290 PCS & 24 METRIC SIZES】：Includes 290 split cotter pins in 24 sizes: M1.5×10/16/20/30mm and M2×10/16/20/30mm, 20pcs per size; M2.5×12/16/20/30mm, M3×16/25/35mm, and M4×20/25/35mm, 10pcs per size; M5×25/30/40mm and M6×25/35/45mm, 5pcs per...
【SECURE SPLIT-PIN DESIGN】：Both prongs pass through a compatible cross-drilled hole and can be bent apart to help retain slotted nuts, clevis pins, axles, and shafts. The classic split design provides a simple and dependable locking method for common...
【VERSATILE REPAIR APPLICATIONS】：Suitable for automotive maintenance, trailer and equipment linkages, tractors, lawn mowers, garden equipment, small engines, and general workshop repairs. Check the required wire diameter, pin length, and...
【LABELED STORAGE CASE】：All 290 cotter pins are organized in a transparent multi-compartment plastic case with a clearly printed size chart on the lid. Separate compartments make different sizes easier to identify and access while helping prevent...
【Sturdy and Versatile】- Our cotter pin assortment kit includes 5 different sizes of spring fasteners that are designed to withstand heavy-duty use. Whether you need to secure a trailer hitch, clamp down on your lawnmower, or reinforce the hardware on...
【Secure Locking Mechanism】- The innovative design of our cotter pins ensures a secure locking mechanism, providing peace of mind when it comes to the safety of your equipment. With their unique shape and sturdy construction, these pins will stay in...
【Easy to Use】- Installing and removing these cotter pins is a breeze. Simply insert the pin through the designated hole, and the spring fastener will automatically lock it in place. When it's time to remove the pin, just release the tension and slide...
【Versatile Application】- Our cotter pins are not limited to a specific industry or use. They can be utilized in a variety of applications, including trailers, clamps, lawn mowers, trucks, and more. Whether you're a professional mechanic or a DIY...
【Heavy-Duty Construction】- Made from high-quality materials, our cotter pins are built to last. With their sturdy construction and corrosion-resistant finish, you can trust that these pins will withstand the test of time and provide long-lasting...
[APPLICATION]: The wire formed pins are used as a pin locking device to hold pins or castle nuts in place in automotive, axles, trailer hitch and tractors, and are highly versatile fasteners.
[PREMIUM QUALITY]: Each high-quality pin is constructed with zinc plated steel that stands the test of time, and ensures that replacements are not needed for your fastening jobs.
[EXTREMELY DURABLE]: The heavy duty material allows for durability while the hair pin style design gives a fast and secure hold for bolts to ensure stability.
[SECURE DESIGN]: The specialty lock ensures a tight lasting hold and comes with a key that opens four types of lock.
[CONVENIENCE]: Every set comes with a see-through resealable storage case storing all material together for portability, organization, and is easy to identify size markings.
【Versatile cotter pin set】Our cotter pin set consists of 180 stainless steel cotter pins in 7 different sizes, ideal for a variety of applications such as locking devices and fixing equipment.
【Durable Stainless Steel】Crafted from high-quality stainless steel, these cotter pins are designed to provide lasting strength and resistance to rust, ensuring reliable performance in all your projects, including car repairs and outdoor tasks.
【Essential for Trailer Locking】This kit features essential hitch pins for trailer locking, ideal for securing trailer clamps and ensuring safety during transport. Perfect for trucks and lawn mowers, it meets all your towing needs.
【Perfect for Engine Repair】Whether you're working on towing hitch clips or engine repairs, our cotter pin set provides the right solution. It's an invaluable asset for DIY fabrication and widget repair tasks around the house.
【Convenient Storage Case】The cotter pin assortment comes neatly organized in a compact storage case, making it easy to access and transport your lock pins when you need them most for any project, big or small.
EMIUM QUALITY MATERIAL: Made of high-quality 304 stainless steel, the LRVOJUY cotter pins are strictly polished for a smooth, burr-free surface. They are corrosion-resistant and rust-proof, ensuring long-lasting durability even in harsh environments.
EASY TO USE & RELIABLE: Designed for quick installation and removal, these cotter pins offer strong structural stability. They ensure a secure and reliable fastening solution for a wide range of mechanical and automotive applications.
ORGANIZED STORAGE BOX: Comes with a sturdy, labeled plastic case that keeps all 12 sizes neatly sorted. Easy-to-read markings help you find the right size quickly, from small to large cotter pins.
VERSATILE APPLICATIONS: Ideal for use in automotive repair, machinery, lawn equipment, trailers, hitch pin locks, marine hardware, tractors, bolts, and DIY crafting projects.
Sufficient quantity:You will receive 304pcs cotter pins and packed in the exquisite plastic box
Material: Our cotter pins are made of premium 304 stainless steel, ensuring durability and long-lasting performance. (304 stainless steel belongs to austenitic stainless steel. Austenite is partially or slightly transformed into martensite during cold...
Assortment of Sizes: This cotter pin set includes 6 different sizes, providing versatility and meeting various needs for securing bolts and pins in mechanical applications.
Smooth Surface: The cotter pins feature a smooth surface finish, minimizing the risk of snags or damage to the surrounding components.
Strong and Reliable: These cotter pins are designed to withstand heavy loads and provide secure fastening, ensuring the safety and reliability of your machinery or equipment.
Comprehensive Assortment: This cotter pin assortment kit includes 180 pieces of cotter pins in 6 different sizes: M1.6 x 25mm (50pcs), M2.5 x 25mm (50pcs), M2.5 x 30mm (30pcs), M3.2 x 30mm (25pcs), M3.2 x 40mm (15pcs), M4 x 60mm (10pcs).
Reliable Construction: Crafted from high-grade 304 stainless steel, these cotter pins are sturdy, corrosion-resistant, and can withstand harsh environments.
Secure Fastening: These cotter pins are designed to securely lock clevis pins, shafts, and other fasteners in place, preventing them from loosening or disengaging due to vibration or movement.
Versatile Applications: Widely used in various applications, including automotive, construction, agriculture, machinery, and DIY projects.
Convenient Assortment: The well-organized assortment kit makes it easy to find the right size cotter pin for your specific needs.
Last update on 2026-09-01 / Affiliate links / Images from Amazon Product Advertising API
How to Choose the Best Cotter Pins
Installation and Replacement Tips
Proper installation ensures the cotter pin performs its intended function. Insert the pin through the designated hole in the fastener and shaft or bolt. Bend the two legs of the pin in opposite directions, ensuring they are securely wrapped around the fastener or any available surface to prevent them from vibrating loose. Avoid using excessive force, which could damage the pin or the components it's securing. When replacing, ensure the new pin is of the same material and size as the original.
Frequently Asked Questions
What is the main purpose of a cotter pin?
The primary purpose of a cotter pin is to act as a fastener, preventing nuts, bolts, and other components from vibrating loose and disengaging. It provides a mechanical lock to maintain the integrity of assemblies.
Are stainless steel cotter pins always the best choice?
Stainless steel offers excellent corrosion resistance, making it ideal for many automotive uses, especially in harsh environments. However, for applications requiring maximum shear strength, carbon steel or alloy steel might be preferred, provided corrosion is managed.
How do I determine the correct diameter for a cotter pin?
The diameter of the cotter pin should match the diameter of the hole it needs to pass through. It needs to fit snugly without being so tight that it requires excessive force to insert.
What is the difference between a hi-grip and a standard round cotter pin?
A hi-grip cotter pin has two loops or eyes, providing a more secure grip and better resistance to vibration. A standard round cotter pin has a single loop, which is simpler but may offer less security in high-vibration scenarios.
Can I reuse an old cotter pin?
It is generally recommended to replace cotter pins whenever they are removed. Reusing a bent or stressed pin can compromise its ability to hold securely, potentially leading to component failure.
What happens if I use a cotter pin that's too long?
If a cotter pin is too long, the extended legs could interfere with moving parts, potentially causing damage or malfunction. It's important for the legs to be bent securely without creating an obstruction.
As an Amazon Associate, we earn from qualifying purchases. Product prices and availability are accurate as of the date/time indicated and are subject to change.
We use cookies to enhance your experience. By continuing to visit this site you agree to our use of cookies. Read our Privacy Policy
Before You Go!
Get the latest deals and product comparisons delivered to your inbox.
