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
ASTM A193 B7 studs are a major part of our business, and we provide A193 B7 studs from 1/4” diameter to 4” diameter in plain finish, or multiple common finishes. We have a large inventory of studs that are ready to ship and we can provide custom stud lengths in less than 24 hours when your Customer needs them fast! Here are the finishes we stock, or frequently sell:
We stock all of the associated hardware including A194 2H heavy hex nuts; F-436 flat washers and lock washers in the assorted finishes. We can assemble the nuts and washers if desired, or pack the order to your Customer’s specification.
B7 is a grade of the spec, A-193, Alloy Steel and Stainless Bolting Materials for High Temp Services. B-7 is a chrome moly steel with a min tensile strength of 125ksi. It is essentialy 4140/42 and heat treated.
This means the tensile strength is 120,000 lbs per square inch. It also lists Grade 8's as 150 ksi fasteners meaning the tensile strength is 150,000 lbs per square inch. Also, the ultimate shear strength of a fastener is typically about 60% of its ultimate tension strength.
Also popular in the plumbing and contractor fields, and when cleanliness and attractiveness is needed. Threaded Rod B7 Alloy. a heat treated alloy threaded rod with 125,000 psi tensile strength. Used in applications where strength or high strength to weight ratio is needed. Meets ASTM A193-B7 requirements.
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Compleate Information About Stainless Steel Stud Anchor
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