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304 Stainless Steel Black Oxide 18-8 Stainless Steel
Brass Silicon Bronze
Zinc Plated Steel

Black Oxide Stainless Steel Hex Jam Nuts

Hex Jam Nuts

Jam Nuts in Various Materials

A jam nut is often used when a nut needs to be locked in place without clamping against another object. The jam nut essentially acts as the "other object", as the two nuts are tightened against each other. They can also be used to secure an item on a fastener without applying force to that object. This is achieved by first tightening one of the nuts onto the item. Then the other nut is screwed down on top of the first nut. The inner nut is then slackened back and tightened against the outer nut.

Stainless Steel

(18% Chrome, 8% Nickel, .08% Maximum Carbon) 18-8 Stainless refers to 300 series stainless steel. 303 and 304 Stainless are the most commonly listed grades, the standard grade for stainless steel fasteners. They are corrosion-resistant and durable. They are often used in marine applications in freshwater environments, but will not work as effectively in a salt water environment as 316 stainless. Stainless alloy resists oxidizing and rusting, however it can tarnish over time.

Black Oxide

Black oxide fasteners are stainless steel fasteners that have been chemically treated to alter certain qualities of the material, most notably the color. The treatment adds a mild corrosion and abrasion resistance and reduces the now black oxide stainless steel fasteners reflective properties. To achieve maximum corrosion and abrasion resistance, the black oxide is sealed with oil and the excess is spun off, which complies with military specifications as a Class 4 finish. Black oxide fasteners are commonly used in the following industries: automotive, motorcycle, guns, knives, archery.

Silicon Bronze

Silicon bronze fasteners are made of copper, silicon, and various other alloys such as zinc, tin, iron and manganese. Silicon bronze is used in marine environments, corrosive environments, and high heat environments. Often used in plumbing and electrical applications, silicon bronze fasteners are also found on tattoo machines and in power plants. Silicon bronze is similar in color to copper and is sometimes used in finish applications for the color.


Zinc plated steel is very common in the fastener industry. Zinc adds a layer of corrosion resistance to plain alloy steel. Clear zinc has a light, shiny color and blue zinc has a bright blue hue. Zinc plated steel is not suitable for extreme environment use, as it is not as resistant to corrosion as hot dipped galvanized.


Brass is an alloy made of copper and zinc. The color of brass can vary from dark to light based on the zinc content; more zinc content produces lighter brass. Brass is prized for its corrosion resistance, however it is quite soft so it is not suitable for all applications. Brass conducts electricity and is also a good conductor of heat. It is often used in pipes, weather stripping, trim, radiators, musical instruments, and firearms.