
The cap screw size for a butterfly valve depends on the valve size and type. For example, a 2-1/2 inch plain-end lug butterfly valve requires a specific cap screw set, while a 6-inch lug-type butterfly valve uses a 3/4-inch diameter cap screw with a thread size of 3/4-10 and a length of 2 inches. The Macomb Group offers a cap screw with these specifications for their 6-inch lug-type butterfly valve. When installing butterfly valves, some maintenance teams prefer using stud bolts and nuts instead of cap screws, but this can be less effective if the cap screws are not the correct length.
Characteristics | Values |
---|---|
Cap Screw Diameter | 3/4 IN |
Thread Size | 3/4-10 |
Length | 2 IN |
Thread Type | UNC |
Valve Size | 2-1/2 IN |
What You'll Learn
Cap screw for 6-inch lug-type butterfly valve
The Macomb Group offers a cap screw for 6-inch lug-type butterfly valves. The cap screw has a 3/4-inch diameter, a thread size of 3/4-10, a length of 2 inches, and a thread type of UNC. It comes in a 16-pack.
The Macomb Group also offers cap screws for 8-inch lug-type butterfly valves. This cap screw has a 3/4-inch diameter, a thread size of 3/4-10, a length of 2-1/4 inches, and a thread type of UNC. It also comes in a 16-pack.
For both products, the Macomb Group is the manufacturer and the brand. The Macomb Group Approved™ identifies a product sold by The Macomb Group that complies with the form, fit, and function of the products that match your search request.
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Stud bolts and nuts vs cap screws
Stud bolts, cap screws, and nuts are essential components in mechanical and structural applications, particularly in the manufacturing industry. While they share similarities in appearance, each has unique characteristics and serves distinct purposes.
Stud Bolts and Nuts
Stud bolts, also known as threaded rods, are metal rods or shafts with threads on both ends. They are designed to be inserted into pre-drilled holes and secured with two hexagonal nuts. Stud bolts are commonly used in applications that require a robust and permanent connection, such as in piping, construction, and automotive industries. They provide a stable connection, even under high-stress loads, and offer flexibility in length as they can be cut to size. Stud bolts are often coated with zinc or other materials to prevent corrosion.
Cap Screws
Cap screws, on the other hand, are threaded fasteners with a cylindrical head and a hexagonal socket. They are designed to be tightened or loosened using an Allen wrench or a hex key. Cap screws are typically used in machinery, equipment, and electronics, where access may be restricted. They provide a high clamping force and are ideal for applications that require frequent disassembly, as they can be easily removed and reinstalled. Cap screws come in various sizes, materials, and finishes, and can be fully or partially threaded depending on the specific requirements.
The main difference between stud bolts and cap screws lies in their design and application. While both are used to secure objects, they differ in functionality. Cap screws are typically used to attach one thing to another, while stud bolts are used to connect two objects together. For example, a cap screw might be used to secure a machine part onto a surface, whereas a stud bolt would be used to connect two flanges in a pipeline.
The choice between stud bolts and nuts or cap screws depends on the specific requirements of the application, including load capacity, access, and connection longevity. Understanding these differences is crucial for making informed decisions and ensuring the success of a project.
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Bolt stress for cap screws and stud bolts
Cap screws and stud bolts are both fasteners used to secure objects, but they differ in design and application. Cap screws, also known as socket head cap screws, have a cylindrical head and a hexagonal socket, and are designed to be tightened or loosened with an Allen wrench or hex key. Stud bolts, on the other hand, consist of a long, threaded rod with threads on both ends and two hexagonal nuts.
When it comes to bolt stress, it's important to understand the concept of tensile stress. Tensile stress is the force that acts on a bolt along its length, and it can be calculated using Hooke's Law, which takes into account the change in bolt length, the applied tensile load, the effective length of the bolt, Young's Modulus of Elasticity, and the tensile stress area.
For cap screws, the focus is often on providing a high clamping force while also allowing for easy installation and removal, especially in applications that require frequent disassembly. The bolt stress for cap screws can be calculated similarly to any other bolt, taking into account the specific dimensions and materials involved.
Stud bolts, on the other hand, are used in applications that require a robust and permanent connection, such as in piping, construction, or automotive industries. The bolt stress for stud bolts can be calculated in the same way as for cap screws, but it's important to consider the additional stress that may be placed on the bolt due to the weight or forces acting on the objects being connected.
In both cases, it's crucial to select the appropriate size, material, and grade of bolt for the specific application. Over-tightening or under-tightening bolts can lead to failure, so it's important to follow torque specifications and consider factors such as lubrication, which can affect bolt tension and torque.
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ASME B16.5 recommendations for stud bolts
ASME B16.5 Stud Bolts are threaded fasteners designed for use in flanged connections. They are used to create secure and leak-proof joints between flanged components, ensuring the integrity and safety of piping systems, pressure vessels, and other industrial equipment. Here are some key recommendations and guidelines regarding ASME B16.5 stud bolts:
Precision Threaded Design
ASME B16.5 stud bolts feature precise threading, which ensures proper engagement with mating flange nuts. This precise threading also helps distribute a consistent clamping force across the flange face.
Standardized Dimensions
These stud bolts adhere to strict dimensional standards outlined in the ASME B16.5 specification. This standardization ensures interchangeability and compatibility with flange components from different manufacturers. The length of the stud bolt, for example, does not include the height of the chamfers (points), and studs are measured parallel to the axis (L) from the first thread to the end of the thread, excluding the chamfers.
High-Strength Materials
ASME B16.5 stud bolts are manufactured from high-grade materials such as carbon steel, alloy steel, or stainless steel. These materials offer exceptional tensile strength and corrosion resistance, making the bolts suitable for demanding environments.
Bolting Materials and Strength
The bolting materials for ASME B16.5 flanges can be classified into three categories: high-strength bolting, intermediate-strength bolting, and low-strength bolting. High-strength bolting materials have allowable stresses that meet or exceed those of ASTM A193 Grade B7. Intermediate-strength bolting materials include various grades of ASTM A193 and ASTM A320. Low-strength bolting materials refer to those with a specified minimum yield strength of no more than 206 MPa (30 ksi), and they are limited to specific flange classes.
Bolting Recommendations
For flange joints, ASME B16.5 recommends using stud bolts with a nut at each end, especially for high-temperature services. The machine bolt is typically furnished with a heavy hex head and nut, while the stud bolt is threaded at both ends or full length and furnished with two heavy hex nuts.
Flange Assembly and Bolt Tightening
Proper assembly of a pipe flange joint involves several steps, including selecting the appropriate flanges, gaskets, and bolts; verifying their integrity; aligning the flange faces; lubricating the bolts; establishing a torque range; and torquing the bolts in a star pattern. After bolt-up, it is important to visually verify proper assembly and engagement of the bolt or stud threads into the nut.
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Cap screw length tolerance
The length of a cap screw is measured from the underhead bearing surface to the extreme end of the screw. The allowable tolerance on length depends on the type of screw and its nominal length. For example, the length tolerance for LEAD POINT captive screws is provided in tabulated form.
The length of the thread is measured from the extreme point to the last complete thread. The thread length on socket head cap screws is defined by Table 1B. The grip gaging length is the distance from the bearing surface of the head to the first complete thread under the head. The body length is the length of the unthreaded portion of the shank.
The length of cap screws for butterfly valves can vary. For example, a cap screw for a 6-inch lug-type butterfly valve has a length of 2 inches and a diameter of 3/4 inches.
It is important to note that bolt lengths for butterfly valves are calculated without including flat washers, lock washers, envelope gaskets, spacers, or full-face reinforcing rings. The lengths shown are typically the maximum allowable, while all others are the minimum allowable.
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Frequently asked questions
The cap screw size for a 6-inch lug-type butterfly valve is 3/4-10 x 2 inches.
Cap screws are recommended over stud bolts for butterfly valves.
Cap screws have a more reliable torque and eliminate the risk of head-to-shank failures. They also have a larger +/- tolerance for length, which can be advantageous in certain situations.
The standard sizes for butterfly valve cap screws vary depending on the valve size and manufacturer. For example, a 2-1/2 inch plain end lug butterfly valve cap screw set is available, and a 6-inch lug-type butterfly valve cap screw has a size of 3/4-10 x 2 inches.
Butterfly valve cap screws can be purchased from various suppliers, such as Macomb Group Approved, Ferguson, and Spears Manufacturing.