Custom CNC Turned Pins

Detailed Description

CNC turned pins provide defined locating points in fixtures, compact mechanisms and equipment assemblies. Straight contact diameters register adjoining parts along a common axis, while stepped sections form stops against the mating surface. Chamfered ends guide insertion, keeping the working diameter distinct from the entry edge.

Bar-stock turning forms the cylindrical body, shoulders and end profiles in a continuous machining sequence. Cross-drilled holes, grooves and threaded ends add retention at selected positions. Locating and pivoting functions remain separate: stationary dowel-style pins hold alignment, while smooth-shank pivot pins provide a bearing surface for limited rotational movement.

Cylindrical Location and Retention

Fixture location relies on the cylindrical contact surface rather than an oversized fastener head. Shouldered profiles set an axial seating point; a groove or cross-hole at the opposite end provides room for a retaining ring or cotter pin. Both features fit into a narrow mechanical joint without changing the working diameter of the pin.

Available Surface Finishes

• Black Oxide: Dark protective finish for carbon steel pins.
• Nickel Plating: Adds metallic surface protection to suitable steel or brass pins.
• Passivation: Supports corrosion resistance on stainless steel pin surfaces.
• Zinc Plating: Protective coating for carbon steel locating and retaining pins.

Surface finishes address exposure and handling while leaving the positioning function with the turned metal geometry. Pin shoulders, locating lengths and chamfered ends remain clearly defined after finishing.

Structural & Functional Breakdown

• Straight Locating Body: Provides a cylindrical registration surface between mating components.
• Stepped Shoulder: Creates a positive axial stop at the installation face.
• Retaining Groove: Accommodates a circlip or retaining ring near the exposed end.
• Cross-hole & Threaded End: Adds pin retention or fastening within the same component.

Each feature has a distinct role. Cylindrical sections establish radial position, shoulders locate the pin axially, and end features prevent unwanted withdrawal. Mechanical clearance around a moving joint remains available beside the smooth contact section.

Key Features

• Precision Turned Diameters: Forms consistent cylindrical locating and pivot surfaces.
• Stepped Pin Profiles: Combines multiple diameters and axial stops in one turned part.
• Chamfered Installation Ends: Creates a lead-in edge for receiving holes.
• Integrated Retention Details: Supports grooves, cross-holes and threaded pin ends.

Turning keeps the pin geometry concentrated along one axis. Small mechanical connections gain their location from the shank and their fastening or retention from features near the ends, rather than separate bulky hardware.

Applications

• Jigs & Fixtures
• Pivoting Mechanical Assemblies
• Industrial Automation
• Automotive Hardware
• Positioning & Alignment Components

Locating pins in assembly fixtures return removable plates, stops and tooling elements to recognizable positions. Pivot pins in compact linkages use a smooth central section as the movement axis, with shoulders and retaining features keeping the connection together.

CNC turned pins also serve in small automotive mechanisms and automation equipment where a connection needs clear axial seating without a large mounting footprint. Solid shank geometry sets these parts apart from hollow sleeves and tubular spacers: the pin itself provides the locating or pivoting surface.