M Series Circular Connectors with Nickel-Plated Brass Housing

LD28/SP28 Square Flange Connector Dimensions and Materials

Material Selection Matters in Circular Connectors

When you specify a circular connector for an industrial application, the housing and contact materials determine how the component performs over its service life. The M Series connectors are built around a deliberate material strategy that addresses corrosion, mechanical impact, and signal integrity in demanding environments.

Metal Housing: Nickel-Plated Brass

The metal version of the M Series uses a nickel-plated brass housing. This combination provides three practical benefits:

• Corrosion resistance: The nickel plating protects the underlying brass from moisture and atmospheric contaminants.
• Impact protection: Brass offers good mechanical strength for industrial environments where connectors may be knocked or pulled.
• EMI shielding: The conductive metal housing helps attenuate electromagnetic interference, which is important for sensitive signal transmission.

Plastic Housing: High-Strength PA66

The plastic version uses PA66 engineering plastic. This material is selected for its weather and chemical resistance, which supports long-term waterproof integrity. PA66 also provides good dimensional stability, helping the connector maintain its sealing performance over time.

Gold-Plated Brass Contacts

All terminals in the M Series are gold-plated brass. The gold plating delivers efficient conductivity and oxidation resistance, which helps maintain stable signal transmission even after repeated mating cycles. This is a key factor for applications where intermittent contact is not acceptable.

What to Look for in Connector Materials

Not all connectors on the market use the same material quality. Some manufacturers may use unplated brass, which is prone to rust, or low-cost ABS or recycled plastics that can degrade under UV exposure or chemical attack. Untreated brass terminals are also susceptible to oxidation, which increases contact resistance and can lead to signal loss or intermittent failures.

When evaluating a connector for your application, consider the following:

• Housing material: Does it match your environmental exposure (humidity, chemicals, UV)?
• Contact plating: Is the plating specified for the number of mating cycles you expect?
• Environmental compliance: Does the manufacturer confirm material compliance with relevant standards?

Why Material Consistency Matters

The M Series material strategy prioritizes structural integrity and performance consistency. This approach is intended to deliver superior waterproofing, longevity, and overall value in demanding applications. For engineers and buyers, this means the connector's performance is less likely to vary between batches or degrade prematurely in the field.

If you are comparing connectors for a new project, ask your supplier for material specifications and test data rather than relying on general claims. This helps ensure the connector you select will perform as expected over its intended service life.

For more information on M Series features, see Unmatched Reliability in Harsh Environments. If you need help matching a connector to your specific application requirements, contact our engineering team with your environmental and electrical specifications.