CNC Machined Steel Flange Coupling Component – Round Base with Locating Dowel Pins and Centered Square Socket for Shaft Interface or Torque Transfer

This precision-machined steel flange component is a custom-engineered part designed for mechanical alignment, connection, and torque transmission. Manufactured via CNC machining, the component features a circular flange base with three evenly spaced dowel pins and a center cylindrical extension ending in a square internal socket.

The part’s geometry enables precise positioning and secure engagement with mating components, such as matching plates, tools, or square shafts—making it ideal for use in jigs & fixtures, drive interfaces, and industrial equipment assemblies.

Key Features

• Material: High-strength steel (e.g., 1045, 4140, or stainless options)

• Manufacturing Process: High-precision CNC turning and milling

• Flange Base:

  • Round profile with three equally spaced dowel pins

  • Pins are cylindrical with hemispherical (dome-shaped) tops for easy alignment

  • Designed to fit into corresponding mating holes on another component for accurate positioning

• Center Extension:

  • Cylindrical hub rising from the middle of the flange

  • Top end contains a square internal socket, precisely machined for insertion of square tools or shafts

  • Ideal for torque transfer or drive engagement

• Surface Finish:

  • Machined or ground surface for flatness and clean fit

  • Optional finishes: black oxide, zinc plating, phosphate, or nitriding for enhanced wear and corrosion resistance

• Tight Tolerance Fit:

  • Pin and socket tolerances can be customized for interference, sliding, or transition fits

Applications

This part is designed for high-precision mechanical assemblies, including:

• Tooling and fixture systems

• Rotational drive interfaces

• Quick-change adapter systems

• Assembly jigs requiring repeatable positioning

• Industrial automation equipment

• Agricultural or construction machinery shaft connections

Its rigid structure, precise dowel alignment, and square socket interface make it suitable for both static and dynamic applications.

Manufacturing Capabilities

We offer full-service OEM production of CNC machined steel mechanical components, including:

➤ CNC Machining

• Turning, milling, and boring for round and complex geometries

• Tolerances up to ±0.01 mm or as per customer requirements

• Precision drilling of dowel pin holes and square socket milling

➤ Heat Treatment & Hardening

• Optional surface or through-hardening (e.g., HRC 40-55)

• Induction hardening available for dowel pins or square socket area

➤ Surface Treatments

• Black oxide

• Zinc plating (clear, yellow, black)

• Phosphate coating

• Nitriding or QPQ (on request)

➤ Assembly & Secondary Processes

• Dowel pin press-fitting or welding

• Broaching of square internal sockets (tight tolerance)

• Deburring, edge rounding, chamfering

Quality Assurance

We maintain rigorous quality control under ISO 9001:2015 standards, including:

• CMM and optical measurement for dimensions and positioning

• Inspection of dowel pin spacing, height, and hemispherical head form

• Verification of square socket dimension, squareness, and depth

• Optional: hardness testing, surface roughness testing, CoC or full inspection reports

Customization Options

We support full customization to fit your assembly or tooling system:

• Flange diameter and thickness

• Dowel pin count, position, height, and tip shape

• Center hub diameter and height

• Square socket size (e.g., 6.35mm / 1/4”, 9.5mm / 3/8”, or custom)

• Through-holes, threaded holes, or bolt patterns on the flange

Design files accepted:

• 2D drawings (PDF, DWG)

• 3D CAD models (STEP, IGS, STL)

• Or provide samples for reverse engineering

Why Choose Us

• Over 20 years of experience in precision CNC steel components

• Advanced machinery for complex geometries and tight tolerances

• Rapid prototyping to high-volume production

• Support for global B2B clients in automation, tooling, robotics, agriculture, and more

• Engineering support from DFM to final delivery

Contact Us

Looking for a reliable custom-machined steel flange component with alignment pins and a square drive interface?

Contact us now to:

• Request a quotation or technical review

• Send your drawings or models

• Get fast sampling and mass production support

• Explore surface finish and hardening options

Let’s help you build components that connect, align, and transmit power with precision and durability.