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SS Grade Fasteners


Fasteners are small hardware components of different shapes and sizes; designed for fastening purpose. From bolts, clamps, rivets, nuts, studs to washers and screws; all components lies in fasteners category. Two or more objects can be joined using fasteners. The objects can be automobile parts, furniture, boxes, envelopes or any other machinery, equipment or device. These components are temporary in nature, because they can be fastened and unfastened repeatedly without causing damage to workpiece. Three series of stainless steel that are mainly used for developing SS fasteners are- 200 series, 300 series and 400 series. Our company fabricates SS grade fasteners with anti-corrosive and mechanical properties.

Industries Served

The variety offered allows buyers hailing from different industries to choose the right fastener for their project. All industries, where machinery, equipment, appliances or devices are manufactured, fasteners are used. Few of the such industries are as follows:
  • Automotive
  • Electronics
  • Engineering
  • Solar
  • Marine
  • Furniture
  • Food Equipment

Are stainless steel fasteners magnetic?

Stainless steel is composed of chromium and alloying elements, like molybdenum and nickel; that protects the alloy from rust and corrosion. It is believed that stainless steel is non-magnetic, but it is not true. Of the five classes of stainless steel available in the market, only one is non-magnetic. That one class is 300 series stainless steel, also called austenitic stainless steel, which is the most popular and widely used SS. The 300 series stainless steel involves types, like 303, 304, 305, 316, 321, 347, etc.

Both the manufacturing/ processing method and steel’s grain microstructure determines whether or not the SS will be magnetic.  The two most popular stainless steel are Type 304 and Type 316. Both have an austenitic microstructure and start out life non-magnetic. The SS grade fasteners are developed from raw steel, which undergoes several cold forming processes (drawing, roll threading, heading). These processes change their microstructure from austenitic to martensitic, thereby making the material more magnetic. Change in microstructure through cold forming is directly related to fastener magnetism.

In order to keep the austenitic stainless steel in its original form, other manufacturing processes, like cut threading vs roll threading can be chosen, instead of cold forming. The original austenitic state of its microstructure can be restored by giving the fastener a finishing through annealing treatment.

List of Magnetic & Non-Magnetic SS Classes

Class

Magnetic

Common Types

Ferritic

Yes

430442

Austenitic

No

304316

Martensitic

Yes

410416

Duplex

Yes

2205, 2507

Precipitation Hardening

Yes

17-4, 17-7