Hex Nuts

Hex nuts are six sided general purpose fasteners with internal screw threads.


Black Oxide

An extremely thin attractive finish with minimal corrosion resistance. This coating reduces galling, improves lubrication of mating parts and reduces glare. This finish looks great when trying to achieve a stylish or "high-tech" look on exposed fastener heads.

This finish improves appearance and provides mild corrosion resistance. It can also increase surface hardness, which improve abrasion resistance, reduces friction, and prevents seizing. This finish is shiny and aesthetically pleasing.

Hot Dip Galvanized

This finish provides some of the highest corrosion resistance. It has been tested at a minimum of 1000 hours in the salt spray test for corrosion, eliminates hydrogen embrittlement, and is free of toxic metals. This a great corrosion resistant environmentally friendly finish.


This coating normally is gray to black in appearance and provides mild corrosion resistance. The darker black coatings are generally iron/manganese based with heavier coating weights, while the lighter gray color is generally zinc based with lower coating weights. Phosphates are often used in conjunction with oil which improves resistance to corrosion and reduces friction.

Nothing has been done to this bare metal surface to improve appearance or corrosion resistance, which is very low if the material is steel. Often the surface has been oiled which improves lubricity. This finish is susceptible to rusting and corrosion in exterior environments. This most basic finish can be used when protection is not an issue or indoors.



This grade is from the SAE scale and made of low carbon steel. This classification is low on the grade scale.

This uncommon grade is used mostly with studs. It is a molybdenum alloy that is used in high temperature and pressure situations. It is a strong grade nut that is similar to grade 7.

This grade is from the SAE scale. Made of medium to low carbon steel, it is of medium strength on the grade scale.

This is a specific designation of a polyamide or nylon plastic. This lightweight material doesn't have corrosion problems, is non-magnetic, non-corrosive, non-toxic, non-flammable and non-conductive. It is much weaker than the SAE standard grade 2, yet great in low strength applications where weight is at a premium.

This grade is part of the SAE classification; it is the minimum standard of the automotive and structural industries, plus it is used in high-temperature applications. Grade 8 is near the high end of the grade scale, although there are higher grades and strengths for more specialized fasteners.



Aluminum fasteners are a light weight alternative to steel fasteners. Aluminum is soft, non-magnetic, and corrosion resistant. These fasteners offer good electrical and thermal conductivity, and a good strength-to-weight ratio.

Brass is a soft, non-magnetic fastener material that offers corrosion resistance, heat and electrical conductivity, and cosmetic appeal. Brass fasteners may be found in electronics, plumbing, and marine applications.

This 2/3 nickel and 1/3 copper material is an alloy developed by the Special Metals Corporation. It has very good strength and is similar in strength to medium carbon steel, however, due to its strength it has poor machining properties. Its composition also provides it with excellent corrosion resistance in specific highly corrosive environments of sea water, hydrofluoric acid, sulfuric acid, alkalines. With the ability to retain its strength at very high and low temperatures it is one of the best materials to resist extreme elemental conditions. Applications include marine fasteners and chemical processing.

Nylon is a lightweight, wear resistant, non-magnetic, non-conductive, corrosion resistant fastener material often used in electronics applications. Nylon fasteners are commonly made of nylon 6/6, which is generally able to withstand oils, greases, and solvents. Many nylons melt rather than burn and have the ability to self-extinguish. Nylon fasteners may swell from moisture absorption, degrade under UV exposure, or fail in high strength applications.
Silicon Bronze

Silicone bronze is a high strength fastener material popular in naval and marine environments, and sewage disposal applications. Silicon bronze is known for its high thermal conductivity, non-magnetic properties, and high resistance to corrosion, even in harsh environments such as those where brines or gases are present.
Stainless Steel

Stainless steel is steel combined with alloying elements, principally chromium, to enhance corrosion resistance and impart other desired properties depending upon the alloying elements in use and their proportions. Many stainless steel fasteners are non-magnetic or less magnetic than regular steel fasteners.

Steel is the most common fastener material due to its strength properties. Unalloyed steel may be surface treated to enhance corrosion resistance and other desirable properties.



Meets ASTM standards for hex nuts for a certain range of sizes, metric and Imperial.
DIN 934

Meets German standards for metric series hexagonal nuts.



Also known as UNC/UNRC, it is the most common threading used on bolts, screws and nuts. These threads have faster assembly times, but have less sensitive adjustment. They generally thread easily, yet are slightly weaker than fine threads.
Extra Fine

Also known as UNEF/UNREF, this is the finest threading and used when engagement length is short.

Also known as UNF/UNRF, this threading is used when higher tensile strengths are needed. These threads have slower assembly times with more sensitive adjustment. They are susceptible to cross threading and are generally stronger than coarse threads.


Hex Nut

The most common hexagonal fastener with internal threads that screws on to the shank of a bolt or a hex cap screw.