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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.
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.
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
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.
【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...
☛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.
555-PIECE COTTER PINS SET: 6 of the most-used inch sizes, 1/16" to 5/32" diameter and 1" to 2" long - 150 pcs 1/16" x 1", 150 pcs 3/32" x 1", 100 pcs 3/32" x 1-1/2", 75 pcs 1/8" x 1-1/4", 50 pcs 1/8" x 2", 30 pcs 5/32" x 1-1/2"
ZINC PLATED STEEL: Heavy duty steel split pins with a zinc plated finish that resists rust and corrosion in the garage, shop, or on the farm; soft enough to bend and spread by hand or with pliers
SECURES CASTLE NUTS AND CLEVIS PINS: Slide through a drilled bolt, clevis pin, or slotted castle nut and bend the legs to stop fasteners from backing out on trailer hitches, tie rods, axles, tractors, mowers, and small engines
ORGANIZED STORAGE CASE: Clear compartment case with a snap-latch lid and printed size chart keeps every assorted pin sorted and easy to find in a tool box or service cart
High-Quality Carbon Steel: Made from durable, high-strength carbon steel, these cotter pins are designed to resist corrosion, wear, and damage, ensuring long-lasting performance even in demanding applications
Versatile Use: Suitable for securing pins, rods, and bolts in automotive, machinery, gardening, and home improvement projects. These pins work well for automotive repair, DIY projects, and mechanical assemblies
Easy Organization: Each cotter pin size is neatly organized in a sturdy, compartmentalized storage case, making it simple to find the right size quickly and keep your workspace tidy
Reliable and Strong: Featuring a sharp, tapered design that ensures a secure hold and a smooth fit into fastening holes, providing a reliable solution for all your pinning needs
Complete Hardware Pins Set: This 110-piece assortment includes 13 popular sizes of R-clips and U-type cotter pins, covering all your daily hardware fastening needs for automotive, trailer, lawn mower, and machinery repairs
Premium Zinc Plated Cotter Pins: Constructed from high-quality carbon steel with a galvanized finish, these R and U type pins offer superior rust resistance, corrosion protection, and long-lasting durability for both indoor and outdoor use
Secure R-Type & U-Type Design: Featuring a flexible hairpin structure, these cotter pins provide a tight and secure lock to prevent loosening or pin loss during operation, ensuring stable and reliable connections
Easy Installation & Removal: The smooth surface and flexible design allow for quick insertion and extraction, saving you time and effort during assembly, maintenance, and repair work
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
Last update on 2026-10-16 / 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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