Straight Cylindrical Internal Thread Sleeve With Rounded End

Core Features

Internal Threaded Bore – The central bore contains pre-formed internal threads that accept standard bolts, screws, or threaded rods, enabling axial connection of threaded components through the sleeve body.

Straight Cylindrical Profile – The sleeve features a consistent outer diameter along its length, providing a uniform cross-section for assembly and supporting applications with specified outer diameter requirements.

Rounded End Profile – One or both ends of the sleeve are formed with a rounded or chamfered profile that reduces stress concentration at the end face and facilitates insertion into assemblies without edge damage or snagging.

Continuous Internal Threading – Internal threads extend throughout the full length of the sleeve, allowing the component to serve as a fully threaded connector or coupling element.

Product Characteristics

The sleeve is manufactured with a straight cylindrical body and internal threads extending along the full length of the bore. The outer diameter is maintained with consistent dimensions along the length. One or both ends are formed with a rounded profile, with the radius dimension specified based on application requirements.

The internal thread is produced with dimensions and tolerances following standard metric or imperial thread profiles. Thread classes include 6H for metric specifications and Class 2B for unified standards. Material composition is controlled to meet specified strength requirements. Carbon steel grades are available for general applications, with material selection affecting column strength and load-bearing capacity. Stainless steel grades are available for corrosion-resistant requirements.

Surface treatment options include zinc plating with various chromate finishes, zinc flake coating, nickel plating, phosphate coating, and black oxide. Each treatment is applied according to defined coating thickness and corrosion resistance parameters.

Application Scenarios

Fastener Connection – Used where two threaded components require axial connection, providing an internally threaded coupling that engages with external threads on both ends.
Spacer and Standoff Applications – Applied where a defined distance is required between components and the sleeve provides both spacing function and threaded connection capability. The rounded ends reduce contact stress on mating components.
Bracket and Panel Mounting – Employed in mounting configurations where the sleeve passes through panels or brackets and provides threaded receptacles for component attachment.
Automotive and Machinery Assembly – Utilized in frame construction and equipment assembly where internal threads enable component attachment without requiring access to both ends.

Customization Options

Specifications and configurations can be adjusted based on application requirements. Outer diameter, overall length, thread size, and end radius dimensions are customizable according to application geometry. Material grades include carbon steel for general applications and stainless steel for corrosion-resistant requirements. Surface treatments are selectable according to environmental exposure conditions, including zinc plating with various chromate finishes, zinc flake coating, nickel plating, phosphate coating, and black oxide.

Frequently Asked Questions

Q: What is the purpose of the rounded end on this sleeve?
A: The rounded end profile reduces stress concentration at the sleeve end, facilitates insertion into assemblies without edge damage or snagging, and minimizes contact stress on mating components during assembly.

Q: What is the difference between this sleeve and a standard threaded sleeve?
A: A standard threaded sleeve typically has flat or chamfered ends. This sleeve features rounded end profiles that provide reduced stress concentration and smoother insertion characteristics for certain assembly applications.

Q: Can these sleeves be supplied with rounded ends on both ends?
A: Yes. Both ends can be supplied with rounded profiles, or the sleeve can be supplied with one rounded end and one flat or chamfered end, based on application requirements.

Q: What is the recommended tightening torque for fasteners used with these sleeves?
A: Tightening torque values are determined by the internal thread size, fastener grade, and application load requirements. Torque specifications should be obtained from engineering standards or calculation methods defined in fastener design guidelines.

Q: What materials are available for threaded sleeves?
A: Material grades include carbon steel for general applications and stainless steel for corrosion-resistant applications. Material selection affects strength characteristics and corrosion resistance.

Q: What surface treatments are available?
A: Surface treatments include zinc plating (clear, yellow, black chromate), zinc flake coating, nickel plating, phosphate coating, black oxide, and other options based on environmental exposure conditions.

Installation Considerations

The sleeve should be positioned with the internal thread aligned to the mating fastener. The rounded ends facilitate insertion into assemblies without edge damage. The fastener should engage the internal thread through the full engagement length specified for the application. Torque application should follow specified tightening procedures. Thread condition should be inspected before installation; damaged or contaminated threads may affect torque readings and assembly integrity.

For applications where the sleeve functions as a spacer, the overall length should be selected to provide the required standoff distance between components. The rounded end profiles should be oriented toward the mating components to minimize contact stress. For plated or coated sleeves, coating thickness should be within specified tolerances to maintain thread fit. When used with components subject to thermal expansion, the sleeve material and length should be evaluated against the application thermal cycling requirements. For applications requiring specific torque coefficients, reference values should be obtained from applicable standards for the specific thread size range.