These are the basic elements to build any type of structure; for decades, Bea has been dealing with the technological problems that are connected with the relevant manufacturing activity. Stud bolts manufactured by Bea are suitable for the most varied needs and are made with any type of material, from the the smallest (5/16” or M6) to the largest diameters (7” or M180).

Studbolts

As one of the leading stud bolt manufacturers, Bea has a long history of addressing the complex technological challenges associated with stud bolt manufacturing. For decades, we have specialized in producing stud bolts that meet the most demanding requirements, ensuring reliability and performance in any application. BEA stud bolts are manufactured with precision, crafted from a wide range of materials, and available in sizes ranging from the smallest 5/16” (M6) to the largest diameters of 7” (M180). Whether you require standard fasteners in low or high grade materials, thanks to our cutting-edge technology and industry knowledge we offer a wide variety of solutions. Bea provides the expertise and quality as one of the premier stud bolt manufacturers in Italy.

Technical specifications

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Industrial applications of stud bolts and custom solutions

Bea Group’s stud bolts are designed for a diverse range of industries, including oil&gas and petrochemical, marine, nuclear, rail, renewable and power generation. Our products are essential in critical applications where strength, durability, and corrosion resistance are paramount. From securing flanges in high-pressure piping systems to fastening structural components in heavy machinery, Bea’s A193 B7M and A193 B8M stud bolts ensure safe and reliable connections in even the most extreme conditions.
We also offer specialized solutions such as stud bolt 625 for environments exposed to seawater or corrosive chemicals, and stud bolt 660a for high-temperature applications like turbine engines. Our expertise in super duplex stud bolts, including stud bolt s32760, provides unmatched resistance to both mechanical stress and corrosive elements, making them ideal for offshore platforms and other challenging environments.

Stud bolts materials and manufacturing techniques

At Bea Group, we produce stud bolts from a variety of high-performance materials, including austenitic stainless steel, alloy steel, and super duplex alloys. Bea’s manufacturing process includes thread rolling, which ensures superior tensile strength and durability compared to traditional cutting methods. This technique not only boosts production efficiency but also guarantees a uniform thread profile, critical for applications requiring precise fastening solutions. With Bea’s advanced production capabilities, each stud bolt is manufactured to meet the specific needs of your project, ensuring the highest standards of quality and performance.

Materials available for the production of stud bolts

ASTM A453 660 /1.4980

Highly creep and corrosion resistant, precipitation hardening austenitic steel. Scaling resistance in air up to appr. 800°C.

UNS S32760 / ASTM A182 F55

Ferritic-austenitic stainless steel. Excellent corrosion resistance against general corrosion, stress corrosion cracking, corrosion fatigue, pitting, crevice and erosion corrosion and possessing very high mechanical strength properties.

ALLOY 718

High temperature, precipitation hardening, nickel-base alloy with particularly high hot strength and yield strength up to 750°C, and excellent creep behaviour up to 700°C. The markedly higher hot strength compare with normal hot work steels in particularly noticeable when used for hot work tools with high mechanical and thermal stresses.

ALLOY 625

Is a non-magnetic, corrosion and oxidation – resistance, nickel based alloy. High toughness and strength in the temperature range cryogenic to 1000°C. The alloy as excellent fatigue strength and stress corrosion cracking resistance to chloride ions.

ALLOY 925

Is as age-hardenable nickel-iron-chromium alloy. Is used in various applications requiring a combination of high strength and corrosion resistance.

MONEL 400

Is a solid-solution alloy that can be hardened only by cold working. It has high strength and toughness over a wide temperature range and excellent resistance to many corrosive environments. It is widely used in many fields, especially marine and chemical processing.

MONEL 500

Is a nickel-copper alloy with combines the excellent corrosion resistance of Monel 400 with the added advantages of greater strength and hardness. The increased properties are obtained by adding aluminium and titanium to the nickel-copper base by heating.

DUPLEX

Ferritic-austenitic stainless steel also referred to as DUPLEX STAINLESS STEELS, combine many of beneficial properties of ferritic and austenitic steels. Due to the high content of chromium and nitrogen, and often also molybdenum, these steels offer good resistance to localised and uniform corrosion. The duplex microstructure contributes to the high strength and high resistance to stress corrosion cracking.

SUPERDUPLEX

A Super Duplex stainless steel is a type of Duplex stainless steel with enhanced corrosion resistance which is categorised by its PREN being greater than 40. The Pitting Resistance Equivalent Number (PREN) is widely used as a means of comparing the relative corrosion resistance of different steel grades.

ASTM A193

Standard Speciﬁcation for Alloy-Steel and Stainless Steel Bolting for High Temperature or High Pressure Service and Other Special Purpose Applications.

ASTM A320

Standard Speciﬁcation for Alloy-Steel and Stainless Steel Bolting for Low-Temperature Service.

ASTM F467

Standard Speciﬁcation for Nonferrous Nuts for General Use.

ASTM F468

Standard Speciﬁcation for Nonferrous Bolts, Hex Cap Screws, Socket Head Cap Screws, and Studs for General Use.

Studbolts thecnical specification

Imperial Range 5/16" - 5"
Metric Range M6 - M125

STUDBOLT SIZE AND DIMENSION TOLERANCE

SECTION D - STUD BOLTS FOR PRESSURE - TEMPERATURE PIPING

LENGHT

INCH
The lenght of the stud bolts, measured parallel to axis, is the distance from first thread to first thread. First thread is defined as the intersection of the major diameter of the thread with the base of the point.

METRIC
The lenght of the stud bolts, measured parallel to axis, is the distance from each stud bolt, including the point.

Length inch	Length inch	Tolerance mm
to 12	± 0,052	± 1,3208
over 12 to 18	± 0,125	± 3,175
over 18	± 0,250	± 6,35

THREADS

Nominal size or diameter

INCH SERIES

1” and smaller

UNIFIED COARSE THREAD SERIES CLASS 2A ASME B1.1

1 1/8” and larger

UNIFIED 8 THREAD SERIES CLASS 2A ASME B1.1

METRIC SERIES

M33 and smaller

METRIC COARSE THREAD SERIES CLASS 6g ISO 68 / ISO 965

M36 and larger

METRIC FINE AND COARSE PITCH THREADS CLASS 6g ISO 68 / ISO 965