Continuous Thread Stud Bolts

Lincoln Structural Solutions specializes in manufacturing threaded studs meeting the ASME B31.3 / B16.5 requirements.

ASME B31.3 is a code standard established by the American Society of Mechanical Engineers (ASME) that pertains to the design, construction, inspection, and testing of process piping systems. While ASME B31.3 primarily focuses on piping systems, it also includes requirements for certain components used within these systems, including threaded studs.

Threaded studs play a crucial role in piping systems, as they are used for various applications such as supporting pipe hangers, attaching flanges, and securing equipment to structural supports. ASME B31.3 provides guidelines and requirements for the selection, design, installation, and inspection of threaded studs to ensure the integrity and reliability of piping systems.

  1. Material Requirements: ASME B31.3 specifies the materials that threaded studs must be made from to ensure adequate strength, corrosion resistance, and suitability for the intended service conditions. Common materials include carbon steel, stainless steel, and alloy steel, with specific requirements for chemical composition, mechanical properties, and heat treatment.
  2. Design and Dimensions: The standard outlines the design and dimensional requirements for threaded studs, including thread size, pitch, length, diameter, and other geometric features. These specifications ensure compatibility with pipe hangers, supports, and other components within the piping system.
  3. Thread Specifications: ASME B31.3 provides detailed specifications for threads on threaded studs, including thread form, pitch diameter, thread depth, and thread engagement. These specifications ensure proper thread fit and alignment with mating components such as nuts, bolts, and threaded holes in piping supports.
  4. Installation and Assembly: The standard includes guidelines for the proper installation and assembly of threaded studs, including torque requirements, thread engagement, and alignment. Proper installation practices are critical to ensuring the integrity and stability of piping systems, minimizing the risk of leaks, failures, or structural issues.
  5. Inspection and Testing: ASME B31.3 also includes requirements for the inspection and testing of threaded studs to verify compliance with specified standards and ensure quality and reliability. Inspection methods may include visual inspection, dimensional checks, non-destructive testing, and mechanical testing to assess the integrity and performance of threaded studs.

Lincoln Structural Solutions manufactures these studs in-house, employing traceable, tested, and inspected materials to ensure the utmost quality and reliability, making them ideal for use in commercial and nuclear industries.

LSS manufactures continuous thread studs in a wide array of materials. Including the following exotic steels.

Inquire about any material not listed below.


Inconel® 600, UNS N06600

Inconel® 601, UNS N06601

Inconel®625, UNS N06625

Inconel®718, UNS N07718


Incoloy® 800H, UNS N08810

Incoloy® 800HT, UNS N08811

Incoloy® 825, UNS N08825

Incoloy® 925, UNS N09925


Hastelloy® C-276, UNS N10276

Hastelloy® C-22, UNS N06022

Hastelloy® B-2, UNS N10665

Hastelloy® G-30, UNS N06030


Monel® 400, UNS N04400

Monel® K-500, UNS N05500


Nickel 200, UNS N02200

Nickel 201, UNS N02201


Zr 702, UNS R60702

Zr 705, UNS R60705


Titanium Gr-2, UNS R50400, DIN EN 3.7035

Titanium Gr-5, UNS R56400, DIN EN 3.7164, 3.7165

Titanium Gr-7, UNS R52400, DIN EN 3.7235

Titanium Gr-23, UNS R56401


AL-6XN®, UNS N08367

25-6Mo, Alloy 926, UNS N08926 (N08925)

254 SMO, UNS S31254,

STAINLESS STEEL - Class 1 and Class 2

A-286 Stainless Steel, UNS S66286

304/304L Stainless Steel, UNS S30403, A193 B8

310S Stainless Steel, UNS S31008

316/316L Stainless Steel, UNS S31603, A193 B8M

317L Stainless Steel, UNS S31703

321 Stainless Steel, UNS S32100

904L Stainless Steel, UNS N08904

Nitronic® 60, UNS S21800


Duplex 2205, UNS S32205, S31803

Super Duplex 2507, UNS S32750

Super Duplex S32760, UNSS32760

ASTM A193 is a specification covering alloy and stainless steel bolting materials for high-temperature or high-pressure service. Within this specification, studs are categorized into different grades and classes based on their material composition, mechanical properties, and intended use.

LSS is able to supply most grades and both Class 1 and Class 2 strain hardened studs.

ASTM A320 is a specification that covers the requirements for carbon and alloy steel bolts and studs for low-temperature service. It is commonly used in applications where materials must withstand extremely cold temperatures, such as cryogenic storage tanks, refrigeration systems, and pipelines transporting liquefied gases.

LSS supplies many grades including L7, L7M, L43, B8, B8M, and B8T. Each grade is designed for different service conditions and environments.

Grade L7: This grade is made of carbon steel and is typically used in low-temperature applications. It is commonly used in pressure vessels and piping systems for cryogenic service.

Grade L7M: Similar to Grade L7, Grade L7M is also made of carbon steel but is subjected to additional heat treatment to enhance its mechanical properties for low-temperature service.

Grade L43: This grade is made of alloy steel and is suitable for low-temperature service. It offers higher strength and toughness compared to Grade L7 and is often used in applications requiring greater mechanical properties.

Grades B8, B8M, and B8T: These grades are made of stainless steel and are used in low-temperature applications where corrosion resistance is required. Grade B8 is made of Type 304 stainless steel, Grade B8M is made of Type 316 stainless steel, and Grade B8T is made of Type 321 stainless steel.

ASTM A307 is a specification that covers carbon steel bolts, studs, and threaded rods of various grades intended for general-purpose applications.

Grade and Class: ASTM A307 does not specify specific grades or classes for studs. Instead, it categorizes bolts and threaded rods into two grades: Grade A and Grade B. Grade A studs are made from low-carbon steel and have a tensile strength ranging from 60,000 to 100,000 psi, while Grade B studs have a higher tensile strength ranging from 60,000 to 115,000 psi.

Thread Type: A307 studs feature standard UNC (Unified National Coarse) threads, making them compatible with corresponding nuts and other threaded components.

Finish: A307 studs are typically available in plain finish or zinc-coated finish. The zinc coating provides corrosion resistance, making them suitable for use in indoor and outdoor applications where exposure to moisture or corrosive elements is a concern. They are also available in Hot Dip Galvanized.

While ASTM A307 studs are not designed for high-strength or specialized applications, they provide a cost-effective and reliable solution for many general-purpose fastening needs. It's essential to ensure that the selected studs meet the requirements of the specific application and are installed correctly to ensure safety and performance.