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Albany County Fasteners - Nuts, Bolts, Screws, Washers, Rivets & Industrial Supply
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Stainless Steel Security Socket Set Screws

Stainless Steel Tamper Proof Socket Set Screws

18-8 Stainless Steel Pin-In Set Screws

Socket Set Screws in this selection are driven with a special hex key or allen wrench designed to accommodate the hex drive with a central pin (pin-in). This pin prevents tampering with the fastener after assembly because it cannot be driven by a standard bit or hex key. Socket Set Screws are also referred to as Grub Screws, or simply Set Screws. Stainless Steel Set Screws are used in applications where a flush surface is key. Because they are headless fasteners, this property also adds a level of security to the screw, since it is resistant to gripping devices and anything besides the corresponding bits. 

Socket Set Screws, Grub Screws
Set screws are commonly used in pulleys, tracks, manufacturing, surfboard fins, handles and grips. Tamper proof screws are commonly seen in public areas because removal of the fasteners will be difficult, if not impossible without the correct bit. Because of this, they are commonly found in public restrooms, safes, hotels, campgrounds, jails and food processing areas. Stainless Steel tamper proof screws are ideal because the corrosion and rust resistance of the metal makes these screws suitable for long-lasting applications.


Shop Tamper Proof Set Screws Today!

 

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Black Oxide Fasteners

Albany County Fasteners is proud to announce our expanding black oxide fasteners line, as well as offering custom black oxide fastener orders. With this announcement, we would also like to share some information with our customers and subscribers about the process, and what exactly makes a black oxide fastener.

On stainless steel (particularly for us in stainless steel fasteners), black oxide fasteners are 18-8 or
Black Oxide Socket Cap Screws

304 grade stainless steel fasteners that have undergone a conversion coating process to alter certain qualities of the material, most notably the color. The chemical treatment process has a greater effect than this coloring however, in that it also adds a mild corrosion and abrasion resistance to the fastener.

The Black oxidation process for stainless steel consists of a series of chemical baths in a mixture of caustic, oxidizing and sulfur salts. Before the part is dipped into a hot bath of a solution of these materials, it is first dipped in an alkaline cleaner, and then water to ensure a surface free of debris. After the piece is treated in this manner, the fastener has porous qualities. This is then finished by infusing the material with oil or wax to add the corrosion and abrasion resistant qualities.
To achieve maximum corrosion and abrasion resistance, the black oxide is infused with wax during the process and complies with military specifications as a Class 4 finish. The enhanced protection, as well as the sleek black finish are why these fasteners are used. Our Stainless Steel Black Oxide Fasteners undergo this chemical process in order to achieve the black oxide properties.
Black Oxide Lock Washers
The benefits of this process are that the fastener becomes more durable, with an insignificant altering of the fastener’s dimensions.

 

Black Oxide fasteners are used commonly in the jewelry industry, the automotive industry on both cars and motorcycles, as well as in knife builds, firearm builds and in small machines. This process can be applied to any stainless steel fastener available on our website making the possibilities virtually endless.
Black Oxide Machine Screw Nuts

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Stainless Steel Applications

Stainless steel is used primarily for long-lasting applications, due to its corrosion-resistant nature and durability. At Albany County Fasteners we stock fasteners various stainless steel grades to provide an appropriate solution for any fastener application. 

 

Stainless Steel Grades:

18-8 Stainless Steel – (18% Chrome, 8% Nickel, .08% Maximum Carbon) – This is 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.
Grades of stainless steel
304 Stainless Steel – (17%-19% Chrome, 8%-12% Nickel, .08% Maximum Carbon) – This is a superior grade of 18-8 stainless steel. 304 Stainless steel is often used to make Machine Screws, Cap Screws, Sheet Metal Screws, Hex Cap Screws and all cold headed or hot forged fasteners. It is often used in food service and dye applications because of its ability to resist the corrosive properties of organic acids.

305 Stainless Steel – (17%-19% Chrome, 8%-10% Nickel, .12% Maximum Carbon) – This grade has been developed specifically to improve the cold heading qualities of 18-8. This grade does not work-hardened products are actually made from this grade even though they are referred to as being made from type 304 Corrosion resistance and physical qualities are equal to Type 304. 305 stainless steel is used to make deck screws, which are used (shockingly) to fasten wood or composite boards to the main beams of a deck.

Square Drive Deck Screw-305 Stainless Steel
316 Stainless Steel – (16%-18% Chrome, 10%-14% Nickel, .08% Maximum Carbon, 2.00% Maximum Molybdenum) – This grade of stainless steel is used and recommended for applications in severe or harsh environments. Its corrosion resistance is greater than 18-8 stainless, which is why we recommend using 316 stainless steel fasteners for salt water environments. It is important to remember that even the salt in the air near a body of salt water can do damage to dry applications, so 316 is the material of choice. Common applications of 316 stainless steel fasteners include boats, docks and piers.   
410 Stainless Steel – (11.5%-13.5% Chrome, .15% Maximum Carbon) – Due to the fact that this grade of stainless steel can be hardened up to approximately 40 Rockwell C, it is durable in most environments. It is commonly used to make roofing screws and siding screws and self tapping (or self drilling) screws, because it is a harder material than the metal being fastened in these types of applications.

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What Do the Numbers Mean?

Stainless Steel Grades

Stainless steel fasteners are defined by the grade of the material. Now what exactly does this mean? See the list below for information on common grades of stainless steel fasteners including material and common applications.

 

    • Type 304: 17%-19% Chrome, 8%-12% Nickel, .08% Maximum Carbon. This is a superior grade of 18-8 stainless steel and is used for Machine Screws, Cap Screws, Sheet Metal Screws, Hex Cap Screws and all cold headed or hot forged fasteners. It is an equivalent to 18-8 Stainless Steel.

    • Type 305: 17%-19% Chrome, 8%-10% Nickel, .12% Maximum Carbon. This grade has been developed specifically to improve the cold heading qualities of 18-8. This grade does not work-hardened products are actually made from this grade even though they are referred to as being made from type 304 Corrosion resistance and physical qualities are equal to Type 304.

    • Type 316: 16%-18% Chrome, 10%-14% Nickel, .08% Maximum Carbon, 2.00% Maximum Molybdenum. This grade is greater corrosion resistance when used with certain acids as compared to general range of 18-8 stainless steel. 316 Stainless Steel is used in saltwater application such as boats and docks.

    • Type 18-8: 18% Chrome, 8% Nickel, .08% Maximum Carbon. Used in most fasteners and is the standard.It is an equivalent to 304 Stainless Steel.

  • Type 410: 11.5%-13.5% Chrome, .15% Maximum Carbon. This grade can be bright and hardened up to approximately 40 Rockwell C. This is used in roofing screws and finishing washers.

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What is Thread Galling?

How To Combat Thread Galling

Stainless Steel Fasteners locking up? It’s probably thread galling, not the quality of the parts but the common problem of using stainless steel fasteners.
The beneficial nature of using stainless steel is that it is corrosion resistant. This property is due to the fact that stainless steel, among other alloys, generate a protective oxide surface film. Though this is beneficial as it provides corrosion and rust resistance, it can sometimes lead to problems with installation.

 

Thread Galling occurs during fastener tightening and installation. When pressure builds between the contacting surfaces of the male and female threads, the protective oxides or coatings begin to shear, causing high points, or imperfections in the raw material to become locked together. The increase in friction causes the two parts to seize or “lock-up”. In serious cases, this problem is even referred to as “cold welding”, which illustrates the severity of the issue. Often, galling can cause damage to the thread of the fastener, but it can still be removed. In severe cases, the two materials completely weld together preventing loosening of the parts, and adding the difficult step of a forced removal and new parts to the process. The frustrating aspect of this is that both the nut and bolt can clear inspection individually, but fail to function effectively as a mechanical unit.

 

Though this problem may be frustrating, it is avoidable. The main issue to address is to decrease the friction between the adjoining parts. This can be done in several ways including a slower installation process (RPMs). The idea behind this method is to reduce the friction (and thus heat), between the parts preventing the “welding” process. Our recommended method, due to its ease of implementation, is lubrication. Common methods include specially designed lubricants and waxes, however due to its safety and ease of availability, we recommend dipping the bolt in Maalox.

 

Update: Maalox is no longer sold at stores so we started carrying an anti-seize solution that we’ve tested ourselves.

 

Introducing MRO ANTI SEIZE SOLUTIONS!

MRO Anti Seize solutions are tested lubricants with carefully manufactured specifications. Each type has unique characteristics which can be found on the individual product pages. We carry several different kinds of anti-seize to make sure we can offer a solution that works for you!

Anti-seize solutions offer many benefits to fastener installations. Not only do they provide fasteners with a layer of lubrication that reduces friction, the coating also creates an extra layer of lubrication and corrosion resistance to make your fastener assembly last even longer!

Other precautionary measures include using coarse threaded fasteners, using different grades of stainless steel for adjoining parts (take the corrosion resistance differences into consideration), and understanding the proper use of lock nuts. Because they are designed to add resistance to the existing threads of the bolt, it is best practice to make sure that a minimal amount of threads extend beyond the nut.

 

Thread Galling

Reducing friction is the preemptive strike against this problem. That is why we recommend lubrication, and MRO anti-seize specifically, due to many of its properties beneficial to both sore stomachs and stainless steel. Galling can be a frustrating problem, but it can be prevented.

If you need any more information on thread galling check out our Fasteners 101: Thread Galling Resource page for more information.

 

 

 

 




In This Video:

Our Fastener Expert explains galling, shows us an example and then explains how to prevent it with an MRO Anti-seize Solution.

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