Swiss Turned Precision Pins

Detailed Description

Positioning a jig plate, retaining a hinge link or locating a compact instrument part often comes down to a small cylindrical pin. Swiss machined pins combine clean locating diameters with short shoulders, grooves or cross holes that keep the assembled parts in place. Straight and stepped forms serve different joints without introducing complex fastening hardware.

Swiss-type turning holds the slender workpiece near the cutting point and forms its primary diameter, chamfers and shoulders. Live-tool drilling creates a transverse hole for a cotter pin or retaining wire. Together, these features form a small part with a clearly defined insertion direction and retention point.

Retained pivot pins use a similar stepped form but keep the moving link captive between stops. Transverse holes provide room for a cotter pin, while a rounded or chamfered end passes through the linkage without catching the mating opening.

Straight Locators, Shoulder Stops And Retention Holes

Fixture locating pins pass through two mating plates, with a cylindrical locating surface that establishes their relative position. Shoulder stops prevent further insertion at the outer face, while a retaining groove or cross hole provides the connection to a clip on the opposite side.

Available Surface Finishes

• Passivation: Improves corrosion resistance of stainless steel pins.
• Black Oxide: Common protective finish for carbon and alloy steel.
• Zinc Plating: Provides economical corrosion protection.
• Nickel Plating: Improves surface protection and appearance.

Surface finishes follow the straight cylindrical body without obscuring its chamfered insertion end or the narrow retaining features.

Structural & Functional Breakdown

• Straight Pin Structure: Provides simple locating and alignment functionality.
• Stepped Pin Structure: Multiple diameters support positioning between different mating components.
• Retention Groove Structure: Supports retaining rings, clips or locking elements.
• Cross-hole Structure: Allows cotter pins, wires or secondary fastening components to be installed.

Cross holes near a pin tip can accommodate a cotter pin after the shaft enters the joint. Opposite shoulders establish the seated position.

Key Features

• Small-diameter Precision Turning: Suitable for slender and miniature cylindrical parts.
• Stable Guide-bushing Support: Helps control deflection during machining.
• Integrated Secondary Features: Cross holes, grooves and threads can be incorporated in one workflow.
• Repeatable Batch Production: Swiss machining is well suited to high-volume precision pin production.

Applications

• Precision Instruments
• Electronics Assemblies
• Automotive Components
• Automation Equipment
• Jigs & Fixtures

Along an assembly fixture, a straight pin enters the locating holes of two stacked plates. Small chamfers help the tip enter the first hole, and the shoulder establishes the seated position against the plate face.

Swiss machined pins also retain compact linkages and instrument parts where clips, wires or shoulder stops maintain position. Their simple cylindrical locating surface stays distinct from the rotating journals and gear seats of drive shafts.