Precision CNC Turned Flanges

Detailed Description

Concentric geometry defines CNC turned flanges used around rotating shafts, pump ports and industrial pipe joints. Turning produces the face, outside diameter, hub and center opening in a coordinated circular profile. This turning sequence places the reference bore and mating face around the same rotational axis.

Bolt circles then secure the flange to another component. Recessed sealing areas, raised shoulders or a hub extension provide local contact and location features without introducing extra spacer rings into the joint. Different flange forms retain that same relationship between the face and bore.

Axial Registers Around The Center Bore

Circular steps can nest against a receiving recess in a housing, while the wider flange face meets the external surface. Bolt patterns remain outside the central contact region.

Available Surface Finishes

• Zinc Plating: Provides economical corrosion protection for carbon steel flanges.
• Black Oxide: Protective finish commonly used for steel mechanical components.
• Anodizing: Suitable for lightweight aluminum flanges.
• Passivation: Improves corrosion resistance of stainless steel surfaces.

Black oxide and zinc plating cover selected steel surfaces. Aluminum and stainless steel versions use their own finishing options, leaving the circular mating geometry recognizable.

Structural & Functional Breakdown

• Central Bore Structure: Provides shaft, pipe or component positioning through the flange center.
• Bolt-circle Structure: Precisely positioned mounting holes support repeatable assembly.
• Stepped Face Structure: Provides locating surfaces between mating components.
• Hubbed Flange Structure: Extended central section adds support around the bore or shaft interface.

Central bores carry the locating function while outer hole patterns distribute fasteners around the contact face. Hubbed sections extend the support close to the shaft interface.

Key Features

• Precision Face Turning: Produces controlled flange thickness and mating surfaces.
• Concentric Bore Machining: Maintains alignment between the bore and outer turned features.
• Bolt-hole Integration: CNC drilling or milling produces customized mounting patterns.
• Custom Face Geometry: Recesses, shoulders, grooves and sealing surfaces can be integrated according to drawings.

Face turning and concentric boring establish the rotational features before secondary drilling forms customized bolt patterns.

Applications

• Pumps & Motors
• Gearboxes & Drive Systems
• Industrial Pipe Connections
• Machine Housings
• Automation Equipment

Pump covers often use a flange face to join a housing and a pipe or shaft connection. Gearbox and drive assemblies use similar circular interfaces for alignment and mechanical attachment around the rotating center.

Stepped contact features distinguish a locating flange from a plain drilled disk. Relationships among the hub, seal face and bolt circle remains visible in the machined component, making assembly orientation straightforward. In CNC turned flanges, the center opening, contact ring and bolt circle remain distinct but connected machined features.