Stainless Steel Fastener Manufacturers, Suppliers, Stockist – Stainless Steel , Duplex, Super Duplex Screws, Threaded Rods, Bolts, Nuts, Washers, Anchors – (18-8, 3-4, 316)

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• A fastener or fastening is a hardware device that mechanically joins or affixes two or more objects together. In general, fasteners are used to create non-permanent joints; that is, joints that can be removed or dismantled without damaging the joining components. Welding is an example of creating permanent joints. Steel fasteners are usually made of stainless steel, carbon steel, or alloy steel.
• Markings on the head of stainless steel fasteners:- A manufacturer marking which simply indicated the company that manufactured the fastener. The strength class which consists of two numbers separated by a decimal point. Common classes are 4.8, 8.8, 10.9, and 12.9. The number of the left indicates 1% of the tensile strength in MPa, or N/mm2. The number on the right indicates the proportion of the yield strength in relation to the tensile strength.
• We are a leading professional manufacturer and supplier of various types of stainless steel fasteners (Sizes M6 to M72) such as bolts, nuts, screws, threaded rods, washers, rivets, anchors, cotter pins, clevis pins, hose clamps, and metal stamping’s. We also produce non-standard inch and metric stainless steel fasteners according to customer drawings and samples. We supply DIN, EN, ISO, ANSI, ASME, ASTM, BS, JIS, UNI and more metric and inch standard stainless steel fasteners, non-standard and customized stainless steel fasteners.
• Metallica is a supplier of a huge range of chrome plated and stainless steel fasteners in Metric, Metric Fine, UNF, UNC, BA, BSF and BSCY (cycle) threads. To meet various requirements for corrosion resistant or strength, we can offer stainless steel fasteners with further treatment such as heating, black oxide, zinc coating, hot dipper galvanizing, black zinc coating, brass coating, nickel and chrome plating, etc.
• We are manufacturing stainless steel fasteners by following a stringent quality control program and standards which assure good surface and close dimensional tolerances. We are a global industry leading provider of stainless steel fastener solutions and have obtained ASME Quality and ISO 9001:2015 Certifications.
• All our stainless steel fastener products are supplied with 3.1 specific test certificates, according to EN 10204. Certification according to 3.2 can be agreed at the time of ordering. Metallica makes it easy for you to source top quality stainless steel fasteners at the lowest prices.

Manufacturing Stainless Steel Fasteners – Nut, Bolts, Screws & Washers

Stainless steel fasteners, nuts, bolts and screws are generally manufactured by two processes namely cold forging and hot forging.

• The cold forging process is generally used for manufacturing small size fasteners while hot forging process is used for large size bolts and nuts. The cold forging process starts with large steel wire rods, which are uncoiled and cut to length. This is followed by pressure forging, cold extrusion and reducing, or a combination of these procedures, followed by heat treating to improve strength and surface treating to improve durability.
• Many other fasteners are also produced by the cold forming or forging process especially for producing large quantities, as it reduces the cost of production. The choice of the suitable forming machine depends on the size of the fastener and on the degree of forming. The greater the degree of forming, the more forming stages are required.
• Screws are usually produced by cold forming process where in we usually receive the wire coiled on rolls.
• Heat treatment process is used after the fastener production to increase the strength or control the mechanical properties of fasteners.
• Nuts are usually produced with the cold or hot forming procedure as well. The choice of one or the other procedure depends on the one hand on the size and on the other on the required quantities.
• The hot forging or forming production method is used mainly to manufacture large diameters starting with approx. M27, and longer pieces starting from approx. 300 mm. In addition, parts are possible that cannot be produced using cold forming because of the very small volumes, or because of a very high degree of forming.
• Washers are produced by punching or forming process. The manufacturing process starts with making of punching die as per the required internal and external diameter of washer.
• There are other operations involved in fastener production, such as head slotting, shank slotting (for thread-cutting screws), head drilling, etc. But the making of and threading the blank are the two major processes.

Stainless Steel Fastener, Nuts & Bolt Specifications, Stock & Production Range

• Email Us on info@metallicametals.com for best prices on various types of Stainless Steel Fasteners, Duplex Fasteners, Super Duplex Fasteners.

Parts of Stainless Steel Fasteners

1. Nuts – Used with a bolt and washer to create a joint. It is considered a temporary joint because it can be easily removed.
2. Bolts – Held on by a nut, typically with a shoulder, bolts have a much higher strength than screws and are used when removing the connection is likely.
3. Washers – Used typically on the nut side of a nut and bolt assembly to provide the nut with a flat and smooth surface to fasten against. They can also protect the material surface.
4. Screws – Used to hold materials together and considered permanent, screws hold themselves into the materials they are installed in without a nut.
   

   Types of Fastener Head

5. Rivets – Considered a permanent install, rivets hold materials together by expanding on one side of the hole resulting in a firm hold.
6. Anchors – Typically permanent. Most are placed in a hole and somehow expanded to fill the hole and prevent pull-through
7. Retaining Rings – A ring the is either expanded or compressed and fit into a recess on a shaft. They are commonly used on shocks to hold springs under pressure.
8. Dowel Pins – A cylindrical metal pin used in machinery to keep pieces in place.
9. Security Screws – Serve the Same functionality as screws but with unusual head styles that may add extra security to your assembly

Note: There are many kinds of each fastener that can serve different purposes. For example, sheet metal screws have sharp cutting threads that will easily cut through soft metals whereas a wood screw is used primarily in wood to wood applications.

Chemical Composition of Stainless Steel Fasteners

Applications of Stainless Steel Fasteners

• Components that are exposed to saltwater, chemicals or other corrosive environments
• High wear parts
• Sanitary equipment
• Components that are exposed to high heat and high stress
• Components that require superior strength and stability.
• Fasteners are widely used in various industries, including energy, electronics, electrical appliances, machinery, chemical industry, metallurgy, dies, hydraulic and other industries.

Advantages of Stainless Steel Fasteners

• Stainless steel owes its high corrosion resistance to its low carbon steel and chromium content. Fasteners made from stainless steel will not lose their corrosion resistance if scratched during installation or use.
• Stainless steel is used primarily for long lasting applications, due to its corrosion-resistant nature and durability. Scratching or burring the metal will not create surface rust as the corrosion resistance exists within the metal itself.
• Stainless is a soft metal due to the low carbon content, therefore most stainless steel bolts are cold-formed and not heat treated or thru-hardened.
• Cold forming and threading cause stainless bolts to become slightly magnetic, some fasteners will be more magnetic than others depending on size and how quick the cold forming process is.
• Stainless fasteners are typically a clean silver color, which also makes them common in finishing and decorative applications.
• Stainless Steel should never be used with aluminum, galvanic corrosion is likely to occur.
• Stainless steel will not rust due to scratching due to the thin layer of chromium creating an invisible protective layer. This thin layer will rebuild itself in the presence of oxygen. Note: If you are not in an oxygen rich environment the material will take longer to rebuild or not rebuild at all. This will leave it open to possible corrosion.

Disadvantages of Stainless Steel Fasteners

1. Need to Be Properly Fastened – With stainless steel fasteners you need to make sure that they are properly affixed with spacers or else you run the risk of metal-on-metal corrosion.
2. Slightly More Expensive – As we’ve stressed above, stainless steel will typically be slightly more expensive than other alternatives. So, equipping your entire project with stainless steel fasteners can be more expensive.

Standards of Stainless Steel Fasteners

The American Society of Mechanical Engineers (ASME) publishes several Standards on fasteners. Some are:

• B18.3 Socket Cap, Shoulder, Set Screws, and Hex Keys (Inch Series)
• B18.6.1 Wood Screws (Inch Series)
• B18.6.2 Slotted Head Cap Screws, Square Head Set Screws, And Slotted Headless Set Screws (Inch Series)
• B18.6.3 Machine Screws, Tapping Screws, and Metallic Drive Screws (Inch Series)
• B18.18 Quality Assurance For Fasteners
• B18.24 Part Identifying Number (PIN) Code System Standard for B18 Fastener Products