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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.
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...
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.
DURABLE CORROSION RESISTANCE: Upgraded Zinc-plated steel cotter pins provide improved rust resistance, suitable for trailers and indoor/outdoor equipment. Designed to withstand UV exposure and heavy loads
SMART ORGANIZATION：YOUR TOOLBOX ESSENTIAL :No more Waste Time Searching for the Right Size Locking Pin Again! This compartmentalized plastic toolbox organizes 5 sizes of cotter pins in clearly labeled slots—so the suitable locking pins，clevis pins...
EASY INSTALLATION AND LOCK – NO TOOLS NEEDED: Quickly secure R-clips and cotter pins by hand within seconds. Designed for Moms, DIY'ers, and pros- alike to secure strollers, lawn mowers, or trucks
RELIABLE LOCKING PERFORMANCE: Helps reduce nut loosening under vibration and stress. Reinforced cotter pins and R-clips offer a secure hold on mower decks, truck parts, and farm machinery
VERSATILE USAGE – INDOOR & OUTDOOR: Whether you're maintaining agricultural equipment, securing trailer hitches, repairing lawn mowers, or tackling DIY projects, this cotter pin set has the right hardware pins for your job. Offers practical pin fasten...
【Sufficient Quantity】:cotter pin assortment kit And Packed In The Exquisite Plastic Box
【Assortment Of Sizes】: Cotter Pin Assortment Kit Includes Various Sizes, Providing Versatility And Meeting Various Needs For Securing Bolts And Pins In Mechanical Applications.
【Product Feature】: The Cotter Pin With Hair Pin Style Design Gives Fast And Secure Hold For Bolts And Pins, Specialty Locks To Ensure Tight Hold That Will Last Long
【Wide Application】: Perfect For Automotive, Mechanics, Car Garage, Workshop, Power Equipment, Cars, Trucks, Lawn Mower, Small Engine Repair, & Fastening
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...
【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...
【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.
☛Cotter Pins Assortment Kit:Package include 13 Size of cotter pins and R hair pins, size-cotter pins M1.6x25, M2.5x25, M2.5x40, M3.2x30, M3.2x40, M4x60;R-cotter pin 1.0x16mm,1.2x21mm,1.6x28mm,1.8x35mm,2.0x40mm,2.5x45mm,3.0x65mm, total 302pcs are sorted...
☛Material:The Cotter pins Made of premium 304 stainless steel allows for durability,not easy to rust, break or deform, polished surface and no burr, safe for your daily use.while hair pin style design gives fast and secure hold for bolts to ensure...
☛Packaging includes: There are 13 sizes in the cotter pin clamp combination kit, totaling 302pcs. Hairpin Cotter Pin(168pcs): M1.6x25mm--50pcs, M2.5x25mm--35pcs, M2.5x40mm--35pcs, M3.2x30mm--20pcs, M3.2x40mm--20pcs, M4x60mm--8pcs; R Clips Cotter...
☛Widely Application: Used to Automotive, Mechanics, Car Garage, Workshop, Power Equipment, Cars, Trucks, Lawn Mower, Small Engine Repair, Fastening.
☛ Product features: Easy To Use, 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
★High quality materials: All the cotter pins are made of high quality stainless steel, with zinc plated on the surface, rust and corrosion resistant, durable and steady not easy to break.Manufactured to ensure that long lasting life, so replacements are...
★Design: These R clips adopt hairpin design, can quickly and safely fix the bolts and pins. These heavy-duty cotter pins are sturdy in structure, reasonable in structure, very convenient to use . It will be your most effective helper in your work.
★Application: High quality cotter pins and hair pin will firmly hold the bolts in place, perfect used for automotive, mechanics, car garage, workshop, power equipment, cars, trucks, campers, lawn mower and Garden Equipment etc.
★Package Included: 4 Pcs M1*16 mm length Cotter Pins, 4 Pcs M1.5*30mm length Cotter Pins, 4 Pcs M2*40 mm length Cotter Pins, 4 Pcs M2.5*50 mm length Cotter Pins, 4 Pcs M3*65 mm length Cotter Pins,which can satisfy your different needs.
★EASY TO USE - Insert the R shape pin into hole directly and it can lock the bolt fast and effectively. It gives fast and secure hold for bolts, easy to install and remove, Fully re-usable.
Heavy duty R clips are not limited to specific industries or uses, Applicable to all kinds of machinery, tractors, lawn mowers, farm equipment, engines, trucks, cars, camper vans, lawn and garden equipment, machinery, workshops, small engine repairs, DIY...
Cotter pin can be directly inserted into the hole to quickly and safely fix various nuts and bolts, prevent them from rotating relatively, and is convenient for installation and disassembly.
Spring fasteners hitch pin are made of high-quality spring steel, it has a smooth surface without burrs, and features excellent corrosion resistance, rust prevention, stability and durability, It is suitable for indoor, outdoor and high-temperature...
These R clips adopt hairpin design, can fast, safe and effective lock bolt, prevent relative rotation, durable.
Last update on 2026-07-18 / 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.
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