These pins are commonly used to secure castle nuts. Hammerlock cotter pins are installed and locked in place with a hammer strike. CircleĬircle cotters, or cotter rings, conceal sharp edges internally to protect materials such as fabrics that may be susceptible to damage. This design allows for a more securely locked assembly. Styleīow tie cotter pins feature a loop on both ends of the pin, allowing for push or pull installation from either side of a hole. It offers the highest strength compared to other metals and elements, but is the least corrosion resistant. The most common material used in fasteners, this material is predominantly iron mixed with carbon. There are over 150 grades of this material with the 304 and 316 series being the most common. The chromium forms a protective layer when exposed to oxygen, keeping the steel underneath from corroding. This material is known for its corrosion resistance and has varying strengths depending on the amount of chromium and nickel alloy. Stainless SteelĪn iron based material with a minimum of 10.5% chromium. Used in locks, gears, doorknobs, plumbing, electrical applications and musical instruments. It has excellent cold working (forming at room temperature) properties. As an electroplated finish it is nonmagnetic and resists corrosion well. This material has a distinctive bright golden coloring and is primarily used in aesthetic settings or in applications where low friction is necessary. This material has a general composition of 2/3 copper and 1/3 zinc. The corrosion resistance and ease of fabrication are why this grade is used in food industry machines, appliances, architectural trim and aquatic fasteners. The ASTM denotation for very similar grade is 304. It is comparable in strength to grade 2 materials, yet slightly weaker and easy to weld. A2-70Ī type of the most common stainless steel grade. The DIN/ISO denotation for a very similar grade is A4-70. It is used in more severe corrosive environments than 304 stainless steel, as such it is used in more industrial settings, like process chemicals, textiles, bleaches, salt water and rubber. It is on the low middle end of the grade scale. The second most common stainless steel grade, this material is stronger than grade 2, slightly weaker than grade 5,or generally as strong as medium to low carbon steel. This finish should not be used in marine or high salt spray environments. Slightly less corrosion resistant than yellow zinc, it is a versatile finish that is best used indoors. It is a popular finish because of its protection, value, and ease of coating. The zinc protects the steel from corrosion and the chromate layer protects the zinc from degrading. It is an electroplated zinc layer covered with a chromate post-treatment. This finish, also know as zinc plating, zinc chromate or dichromate provides good corrosion resistance and is the standard for many hardware fasteners. This most basic finish can be used when protection is not an issue or indoors. This finish is susceptible to rusting and corrosion in exterior environments. Often the surface has been oiled which improves lubricity. They are also used to secure ceiling fans to prevent falling if the mounting nut loosens.Nothing has been done to this bare metal surface to improve appearance or corrosion resistance, which is very low if the material is steel. These cotters have a short threaded section at the narrower end of the taper, which is used to hold the cotter in place with a washer and nut. The angle of the wedge determines the position of the parts being held therefore, on a bicycle, the pedal arms will only be at 180 degrees to each other if the angle of the cotter pin's wedge is the same on both pins.įormerly, it was common to mount bicycle cranks using a cotter, although now usually a more easily maintained arrangement is used such as a square tapered or splined interface. Typical applications are in fixing a crank to its crankshaft, as in a bicycle, and a piston rod to a crosshead, as in a steam engine. NEIKO 50454A Cotter Pin Assortment 555 Piece Zinc Plated Premium Quality Steel Split Pin Fastener Clips Straight Hairpins Holds Pins or Castle Nuts in Place. Brand / Quality: Simply Cotter Pins - High Quality Outside Diameter: 2.5mm Length: 40mm Average Rating (3 Reviews) 2.5x50mm Bright Zinc Plated Split Cotter Pins Bright zinc plated steel split cotter pins: Made from bright zinc plated mild steel these pins are ideally suited to both indoor or outdoor applications. In British usage cotter pin has the same meaning, but in the U.S. Another view, with scale, of bicycle crank cotterĪ cotter is a pin or wedge passing through a hole to fix parts tightly together.
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