Body Studs: The Unsung Fastener Heroes of High-Stress Applications
Body Studs, often simply referred to as Stud Bolts or Double-Ended Studs, are critical components in heavy-duty engineering. At Indiafastners, we understand that for demanding applications in industries like Oil & Gas, Petrochemical, Power Generation, and Heavy Machinery, a standard bolt simply won’t suffice.
This guide explores what makes the Body Stud an essential industrial fastener, its key types, and why choosing the right material and supplier in India, like Indiafastners, is crucial for operational safety and longevity.
What is a Body Stud (Stud Bolt)?
Unlike a conventional bolt, a Body Stud is a headless fastener that features external threading on both ends of a cylindrical rod. They are typically used with two nuts—one on each end—to clamp components together, often in flanged connections.
The defining characteristic of many heavy-duty industrial stud bolts is the plain shank or body in the center.
The Role of the Plain Shank
In high-strength bolting (e.g., as per ASME B16.5 standards for pipe flanges), the body stud bolt with a plain shank is preferred over a fully threaded rod for a key reason:
- Increased Strength and Fatigue Resistance: The plain shank’s diameter is typically slightly larger than the minor thread diameter. This uniform, un-interrupted cross-section helps distribute stress more evenly, making the stud highly resistant to fatigue failure and shearing under high-stress, high-vibration, or high-temperature conditions.
Key Types of Industrial Stud Bolts
While often grouped together, industrial stud bolts come in specific configurations, each suited for different bolting needs:
| Stud Bolt Type | Description | Common Application |
| Double-Ended Stud Bolt | Features equal-length threads on both ends with a defined, unthreaded body/shank in the center. | High-strength flange bolting (ASME B16.5, B16.47), where components are thick. |
| Full-Threaded Stud Bolt | Threading runs the entire length of the rod. | Used where maximum thread engagement is required or as a long tie rod. |
| Tap-End Stud Bolt | Has a short thread on one end (the “tap end”) for permanent installation into a tapped hole, and a longer thread on the other end for a nut. | Securing engine components or pump casings where frequent disassembly of the top part is needed. |
The Importance of High Tensile Materials
In sectors like oil refineries and power plants, fasteners must withstand enormous tensile forces, pressure, and extreme temperatures. This is where High Tensile Body Studs become mandatory.
- Grades & Standards: We manufacture and supply high tensile stud bolts in critical grades such as ASTM A193 Grade B7 (commonly used for high-temperature service) and ASTM A320 Grade L7 (for low-temperature service). Metric grades like 8.8, 10.9, and 12.9 are also available for structural and heavy machinery applications.
- Material Composition: Depending on the environment, we offer stud bolts in:
- Alloy Steel (e.g., B7)
- Stainless Steel (304, 316, Duplex, Super Duplex)
- Carbon Steel
Corrosion Protection & Coating
To ensure maximum service life in challenging Indian weather and industrial environments, body studs are often treated with specialized coatings:
- Hot Dip Galvanizing (HDG)
- PTFE (Teflon) Coating (Excellent for chemical resistance and reduced friction for precise torque)
- Zinc Plating/Black Oxide
Body Studs for Flange Bolting: The ASME Standard
The primary application for body stud bolts is in connecting pipe flanges according to the ASME B16.5 and ASME B16.47 standards. These standards precisely dictate the diameter and length of the stud bolt required for a specific pipe size and pressure rating (e.g., Class 150#, 300#, 600#).
Correct sizing is non-negotiable for a leak-proof and safe connection. Indiafastners ensures all our flange stud bolts meet these stringent international dimensions.
Why Choose Indiafastners for Your Body Stud Requirements?
As a leading fastener manufacturer and supplier in India, Indiafastners is committed to supplying high-quality, technically sound industrial stud bolts.
- Compliance: All products meet international standards (ASME, ASTM, DIN, ISO).
- Material Expertise: Ready stock and custom production in a range of high tensile and corrosion-resistant materials.
- Quality Assurance: Rigorous testing to guarantee the required tensile strength and hardness.
- Nationwide Supply: Reliable logistics across India for time-critical projects.
When your project demands the highest level of joint integrity, trust the strength and precision of a genuine Body Stud Bolt.
Looking for a quote on High Tensile Stud Bolts, Flange Studs, or Double-Ended Fasteners? Contact Indiafastners today to discuss your industrial application and technical specifications.