Stud bolt is basically a threaded rod. Double end stud bolt has threads on both the ends it can fasten two flanges more effectively. They are mostly used while attaching flanges or pipes together. Length of thread varies according to requirement.
There are vairous types of Bolts viz :
|Full Threaded Stud||Double Threaded Stud||Tap Stud|
|Electro Zinc Plating||Hot Dip Galvanizing||Ptfe Fluorocarbon Coating|
|Aluminizing||Ceramic Filled Fluorocarbon Coating||Nickel Plating|
|Mechanical Zinc Coating||Electro Zinc Colbalt Plating||Electro Zinc Nickel Plating|
|Phosphate Coating||Electro Less Nickel Plating||Electro Cadmium Plating|
|Dacromet 320 500 Coating||Pickled Passivated Fasteners||Silver Plating|
|Zinc Plating||Mechanical Galvanization||ZN Phosphating|
|MN Phosphating||Cadium Plating||Zinco-Nickel Plating|
|Nickel Electroless Plating||Burnishing||Geomet|
|Customised Coating||Ceramic Filled Fluorocarbon Coating|
Types of Studs
Continuous Thread Studs
|Continuous-thread studs are threaded from end to end and are often used for flange bolting with two nuts applied.|
|Type 1 – General purpose. The length of this type is measured from end to end. Threads are UNRC-2A.||Type 2 – Studs for temperature-pressure piping. These studs are made to the dimensional standard requirements of ANS B16.5 and have a length measurement requirement different from all other studs, i.e., the length is measured from first thread to first thread, exclusive points. Points are flat and chamfered. Threads are UNRC-2A for all sizes 1 in. and under and 8UNR-2A for all sizes over 1 in.|
Tap End Studs
Tap-end studs have a short thread on one end, called the tap end which is threaded to a Class NC5 or Class UNRC-3A fit.
This end is for screwing into a tapped hole. The other or nut end is threaded with a Class UNRC-2A fit. Length of the stud is measured overall. The tap end has a chamfered
point, but the nut end may have either a chamfered or round point, at the manufacturer’s option. Tap-end studs
are available in four types, as follows:
Double End Studs
Double-end studs have equal-length threads on each end to accommodate a nut and are threaded to a Class 2A fit. Length of stud is measured overall. Both ends have chamfered points, but round points may be furnished on either or both ends at the manufacturer’s option, This style is furnished in the same four types listed for tap-end studs. Double-end studs are used for flange bolting or other applications where torching from both ends is necessary or desirable. Most steel grades not heat treated or quenched and tempered can be furnished on special order for production quantities. Only the Type 2 continuous thread studs made to specification ASTM A193 grade B7 are stocked in a full range of sizes.