Plain Eyelets

Plain eyelets provide a stable, insulated passage for conductors, leads, or mechanical elements that must pass through a housing or barrier. Their straight wall geometry supports consistent alignment and predictable behavior during assembly, making them suitable for applications where electrical isolation, thermal stability, and dimensional accuracy are required. These components are used in assemblies that rely on repeatable fit and long term material performance.

The eyelets on this page are organized by dimensional attributes to support efficient selection during design, prototyping, and procurement. Segmenting by size allows engineers to match eyelets to conductor diameters, housing openings, and joining processes without relying on part number order.

Functional Role in Assemblies

Plain eyelets are used when a conductor or mechanical pin must pass through a wall while maintaining insulation, mechanical alignment, and separation between internal and external environments. The straight wall design provides a uniform interface that supports stable seating during soldering, brazing, adhesive bonding, or mechanical fastening.

These components are commonly used in sensor housings, power electronics, vacuum devices, RF enclosures, aerospace hardware, and medical instrumentation. Their geometry supports consistent alignment and predictable behavior during thermal cycling, vibration exposure, and high temperature joining processes.

Material and Construction Characteristics

Plain eyelets are typically manufactured from alumina or comparable technical ceramics. These materials offer:

• High dielectric strength
• Low electrical loss
• Stable performance at elevated temperatures
• Wear resistance
• Chemical inertness
• Low thermal expansion relative to metals

These characteristics support reliable operation in assemblies exposed to heat, abrasion, or corrosive environments. The ceramic body maintains its insulating properties and dimensional accuracy during brazing, soldering, or mechanical retention.

Applications and Use Cases

Plain eyelets are selected for assemblies that require:

• Electrical isolation between conductors and housings
• Stable alignment of pins or leads
• Uniform seating surfaces for joining processes
• Resistance to heat, abrasion, or corrosive environments
• Long term dimensional stability under thermal cycling

Typical applications include hermetic feedthroughs, high temperature sensors, power modules, vacuum systems, and high frequency electronics. The straight wall geometry supports consistent retention and alignment in assemblies where polymers or metals may deform or degrade.

FAQ

What Determines Compatibility Between a Plain Eyelet and a Conductor?

Compatibility is based on the through hole diameter relative to the conductor size. The conductor must fit without excessive clearance, and the wall thickness must support the required electrical spacing and mechanical stability.

How Does the Straight Wall Geometry Affect Assembly Performance?

The straight wall design provides uniform seating and predictable alignment during joining processes. This supports consistent behavior under vibration, thermal cycling, and mechanical load.

Why Are Ceramic Materials Used for Plain Eyelets?

Ceramic materials offer electrical insulation, thermal stability, and wear resistance. These properties support reliable performance during high temperature joining and long term operation.

Which Dimensions Are Most Important During Selection?

Through hole diameter, outer diameter, and body length are typically the primary selection factors. These dimensions determine conductor fit, panel compatibility, and seating behavior.

Segmenting by dimension will alter the order of part numbers.