Stud Bolts

 

Having visible threads but no head, stud bolts are a type of mechanical fastener. Either the external thread runs the entire length of the stud or only partially does so from each end. For installation, at least two nuts are needed, one on each side. There are many different sizes, kinds, and threading patterns of stud bolts.

An exterior threaded mechanical fastener is known as a stud bolt. Stud bolts are frequently used in pipeline flange connections and high-pressure pipes. The various types, specifications, materials, options, and sizes of stud bolts will all be covered in this article.

Depending on the threading pattern and design, there are various stud bolt types available, as demonstrated below: 

• Continuously threaded stud bolts having a fixed thread length, often known as fully threaded stud bolts
  
  
• Tap ends stud bolts have non-threaded centers and unequal threading on both ends.
  
  
• Double-end stud bolts have centers that are not threaded and threaded ends that are of equal length.
  
  
• Flange stud Bolts are stud bolts that have been fully threaded and have one end chamfered, making them ideal for flanged connections.
  
  
• Reduced-shank double-end stud bolt having a non-threaded center component that is less in diameter than the shank's true diameter.

Based on the material strength of the stud bolts, three groups are distinguished:

• Stud bolt with high strength
  
  
• Stud bolt of medium quality
  
  
• Stud bolt with low strength

Dimension/Size of Stud Bolts

The regulatory standards ASME B16.5 and ASME B16.47 establish the stud bolt's size and dimensions, based on the pressure class, flange type, and pipe size. These standards also indicate the number of bolts needed and the bolt diameter.

The bolt area typically increases along with the pressure class and NPS. Bolt diameter and number of bolts are two factors that affect bolt area. Therefore, the bolt area may be increased by varying one, both, or both of the two parameters.

OAL/FTF stud bolt length

Either the overall length (abbreviated "OAL") or the "first useable thread to first useable thread" (abbreviated "FTF") of the stud can be used to determine its length.

The OAL length is subtracted by a quarter of an inch to get the FTF length, which is the typical stud length measurement for piping applications.

Studs of varying lengths and widths are required for flanges of varied diameters and ratings.

The Stud Bolt's Main Use

• It is used in the main body of heavy machinery, the need to install accessories such as a mirror, mechanical seal seat, reducer frame, and so on. Because the accessories are frequently disassembled, the thread will wear or damage, making the use of stud replacement very convenient at this time.
  
  
• The stud is used when the width of the connecting body is very large and the bolt size is long.
  
  
• Used to connect thick plates that are difficult to connect with hexagonal bolts, such as concrete roof trusses, roof beam suspension monorail beam suspension parts, and so on.

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