|STAINLESS STEEL STUD BOLTS||STAINLESS STEEL STUD BOLTS GRADES|
316 stainless steel stud bolts
Stainless Steel 304 Stud Bolt
In Petro and chemical industry for flange connections Stud Bolts and Hex Bolts are used. The Stud Bolt is a threaded rod with 2 heavy hexagon nuts, while the Hex Bolt has a head with one nut. Nuts and head are both six sided.
The quantity of bolts for a flange connection will be given by the number of bolt holes in a flange, diameter and length of bolts is dependent of flange type and Pressure Class of flange.
Stud Bolt length are defined in ASME B16.5 standard. The length in inches is equal to the effective thread length measured parallel to the axis, from the first to the first thread without the chamfers (points). First thread is defined as the intersection of the major diameter of the thread with the base of the point.
Bolts threading are defined in ASME B1.1 Unified Inch Screw Threads, (UN and UNR Thread Form). The most common thread is a symmetrical form with a V-profile. The included angle is 60°. This form is widely used in the Unified thread (UN, UNC, UNF, UNRC, UNRF) form as the ISO / metric threads.
The advantage of a symmetrical threads is that they are easier to produce and inspect compared with non-symmetrical threads. These are typically used in general-purpose fasteners.
Thread series cover designations of diameter/pitch combinations that are measured by the number of threads per inch (TPI) applied to a single diameter.
STANDARD THREAD PITCHES
Hex nuts (dimensional data) are defined in ASME B18.2.2, and even as bolts the threading in ASME B1.1. Depending on a customer specification, nuts must be both sites chamfered or with on one side a washer-face.
Dimensions of above mentioned nuts, can be found on page Heavy Hex Nuts of this website.THE HEIGHT OF A NUT FOR A STUD BOLT IS THE SAME AS THE DIAMETER OF THE THREAD ROD
Dimensions from Stud Bolts are defined in the ASME B16.5 standard. The material qualities for studs are defined in the different ASTM standards, and are indicated by Grade. Frequently used grades are A193 for thread rods and A194 for the nuts.
ASTM A193 covers alloy and stainless steel bolting material for pressure vessels, Valves, flanges, and fittings for high temperature or high pressure service, or other special purpose applications.
ASTM A194 covers a variety of carbon, alloy, and martensitic and austenitic stainless steel nuts. These nuts are intended for high-pressure or high-temperature service, or both.
Thread rods and nuts must be marked by the manufacturer with a unique identifier to identify the manufacturer or private label distributor, as appropriate. Below a number of ASTM examples.
Below a table with materials and grades for flanges, thread rods (bolts) and nuts, arranged on design temperature, flanges, thread rods and recommended nuts.
|-195° to 102°C||ASTM A182 |
Gr. F304, F304L, F316,
F316L, F321, F347
|A320 Gr.B8 Class2||A194 Gr.8A|
|-101° to -47°C||ASTM A350 |
|A320 Gr.L7||A194 Gr.7|
|-46° to -30°C||ASTM A350 |
|A320 Gr.L7||A194 Gr.7|
|-29° to 427°C||ASTM A105||A193 Gr.B7||A194 Gr.2H|
|428° to 537°C||ASTM A182 |
|A193 Gr.B16||A194 Gr.2H|
|538° to 648°C||ASTM A182 |
|A193 Gr.B8 Class1||A194 Gr.8A|
|649° to 815°C||ASTM A182 |
Gr. F304H, F316H
|A193 Gr.B8 Class1||A194 Gr.8A|
Compleate Information About ASTM A193 Stainless Steel Stud Bolt
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