Introduction
Stud Bolts are essentially threaded rods with threads on both ends. Typically, they are renowned for their strength, corrosion resistance, and ease of maintenance. Hence, they
are used primarily in high-pressure applications to connect flanges, valves, and other pipeline components.
Unlike conventional Stud Bolts they do not possess a head and are engineered with ‘Precision’ to be used with two nuts—one on each end—for a secure and balanced fastening.
We at Metal Forge India, a leading Manufacturer of Stainless Steel / Carbon Steel in India offer you premium Stud Bolts and other fastening solutions that deliver ‘High-Performance’. Also, they have been engineered by us using ‘Precision’ engineering to meet global standards like ASTM, ASME, and DIN. Our Stud Bolts are manufactured using high grade materials, sizes, and thread types that suit diverse industrial needs.
Types of Stud Bolts:
Typically, it is depending on the different industrial requirements that there are different types of Stud Bolts. They are as follows:
1. Tap End Stud Bolts
The thread lengths of Tap end studs are unequal on each end. One has longer thread (nut end), while the other (tap end) is shorter. It is screwed into a tapped hole.
2. Fully Threaded Stud Bolts
These are Stud Bolts threaded across their entire length. Usually, they are used with two nuts, one on each end. They are ideally suited for flange bolting in high-pressure systems where a tight and secure seal is critical.
3. Double End Stud Bolts
This bolt type has equal thread lengths on both ends and an unthreaded shank in the middle. Typically, used when two components must be fastened together with nuts on both sides.
4. Reduced Shank Stud Bolts
Stud Bolts possess a reduced diameter in the unthreaded section between the two threaded ends. It is engineered with ‘Precision’ to reduce stress concentration in the bolt under high loading.
5. Continuous Thread Studs
Referred to as “all-thread studs, “usually cut to length as per application requirements. Usually, they are similar to fully threaded studs.
Industrial Uses of Stud Bolts
It is for high strength, reliability, and corrosion resistance that Stud Bolts are regularly used in critical fastening applications. They are as given below:
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- Oil and Gas Industry
- Power generation
- Aerospace & Defense
- Water Treatment & Desalination
- Pulp & Paper Industry
- Mining & Earthmoving Equipment
- Construction & Infrastructure
Material Grading Table for Stud Bolts:
The comprehensive material grading information about Stud Bolts is given in the table below:
| Material Grade | Standard Specification | Tensile Strength | Typical Applications | Key Properties |
|---|---|---|---|---|
| ASTM A193 B7 | Alloy Steel | 125 ksi (860 MPa) | Oil & gas, Petrochemical | High strength, Heat resistant |
| ASTM A193 B7M | Alloy Steel (Tempered) | 100 ksi (690 MPa) | Sour gas, High H2S areas | Hydrogen sulfide resistance |
| ASTM A193 B16 | Alloy Steel | 125 ksi (860 MPa) | Power plants, Pressure vessels | High temperature performance |
| ASTM A320 L7 | Low Temp Carbon Steel | 100 ksi (690 MPa) | Cryogenic applications | Excellent at low temps |
| ASTM A193 B8 (304) | Stainless Steel | 75 ksi (515 MPa) | Chemical processing, Food industry | Corrosion resistance |
| ASTM A193 B8M (316) | Stainless Steel | 75 ksi (515 MPa) | Marine, Pharma, Water treatment | Enhanced corrosion resistance |
| ASTM A453 Gr. 660 | Austenitic Alloy Steel | 125–160 ksi | High temp, Turbines | Creep resistance, High strength |
| ASTM A194 2H | Carbon Steel Nuts (used with B7 bolts) | – | Flange connections | High pressure and heat resistance |
| Duplex 2205 | Stainless Steel (Duplex) | ≥ 95 ksi (655 MPa) | Marine, Desalination | High strength + corrosion resistance |
| Super Duplex 2507 | Stainless Steel | ≥ 116 ksi (800 MPa) | Offshore, Chemical | Excellent chloride resistance |
| Inconel 625/718 | Nickel Alloy | 120–150 ksi | Aerospace, High temp | Oxidation + corrosion resistant |
| Hastelloy C276 | Nickel-Molybdenum Alloy | ~115 ksi (790 MPa) | Acidic environments | Superior chemical resistance |
| Monel 400 | Nickel-Copper Alloy | ~70 ksi (483 MPa) | Marine, Chemical | Saltwater and chemical resistance |
TPI Testing & Testing Procedure for Stud Bolts
The details of showcasing the quality assurance and compliance of Stud Bolts is given in the TPI Testing & Testing Procedure Table given below:
| Test Name | Test Method / Standard | Purpose | Performed By | Third-Party Inspection (TPI) Agencies |
|---|---|---|---|---|
| Visual Inspection | ASME B18.2.1 / ASTM A193 | To check surface finish, dimensions, thread integrity | In-house QC | TÜV, BV, DNV, Lloyd’s, SGS |
| Dimensional Inspection | ASME B1.1 / B1.13M | Verifies thread pitch, length, diameter | In-house / TPI | TÜV, BV, DNV, Lloyd’s |
| Hardness Test | ASTM E18 / E384 (Rockwell / Vickers) | Ensures material hardness as per grade | In-house / NABL lab | SGS, TÜV, BV |
| Tensile Strength Test | ASTM E8 / A370 | Determines tensile and yield strength | NABL-accredited Lab | Lloyd’s, DNV, Intertek |
| Proof Load Test | ASTM A193 / A194 | Ensures bolt can withstand load without permanent deformation | In-house / TPI | TÜV, SGS |
| Chemical Composition Analysis | ASTM E415 / Spectrometer | Confirms material composition (Fe, C, Cr, Ni, etc.) | In-house / Spectro Lab | BV, SGS, Intertek |
| Impact Test (Charpy V-Notch) | ASTM E23 / A370 | Assesses impact resistance at sub-zero temperatures | External Lab | DNV, TÜV, Lloyd’s |
| Magnetic Particle Inspection (MPI) | ASTM E709 | Detects surface and near-surface cracks | NDT Level II Technician | SGS, TÜV |
| Ultrasonic Testing (UT) | ASTM A388 | Internal flaw detection in raw materials | External NDT Agency | TÜV, Lloyd’s |
| Salt Spray Test (for Coated Bolts) | ASTM B117 | Evaluates corrosion resistance of coated bolts | External Lab | SGS, Intertek |
| Hydrogen Embrittlement Test (for plated bolts) | ASTM F519 | Checks susceptibility to hydrogen-induced cracking | NABL-accredited Lab | SGS, Intertek |
Why Choose Metal Forge India for Stud Bolts
At Metal Forge India, a top Manufacturer of Stainless Steel / Carbon Steel in India we seek to deliver precision-engineered stud bolts that meet the highest standards of performance, durability, and reliability. Besides, there are several reasons why you need to choose us. They are as follows:
- Provision of superior quality of material
- Offering comprehensive product range
- Customised solutions
- Quick and effective delivery
Do you want high-quality Stud Bolts at competitive prices? If yes, visit Metal Forge India, because we offer you precision-engineered stud bolts in a wide range of materials, sizes, and grades — ready to meet your project’s technical and delivery requirements.
Stud Bolts
Stud Bolts
