What does the "7/8" in the 7/8" connector mean?

7/8"-16 UN Thread Specification

Thread Type : Unified National (UN) inch thread, 7/8"-16 UN represents 7/8 inch nominal diameter with 16 threads per inch, not the outer diameter of the connector .
Key Distinction : The 7/8" value in the thread specification refers to the nominal size of the thread, not the outer diameter dimension of the 7/8" connector itself.

Panel Opening & Installation Parameters

Standard Panel Opening Size

Nominal Opening :
• Recommended diameter: 22mm (±0.2mm)
• Tolerance range: 21.8mm ~ 22.2mm

Installation Note :
• The opening size is matched to the connector's mounting base
• Ensure no burrs after opening to avoid seal damage

Inch Thread Technical Details

7/8"-16 UN Parameters :
• Thread pitch: 1.5875mm (1/16 inch)
• Major diameter: ~22.225mm
• Minor diameter: ~20.637mm

Application Scope :
• Complies with Mini-Change standard connectors
• Mainly used for industrial circular connector mating

Technical Tip: When processing the panel opening for 7/8"-16 UN connectors, prioritize using a 22mm reamer to ensure dimensional accuracy. The 7/8" thread specification is an industry standard for this type of connector, and it is critical to distinguish between thread nominal size and connector outer diameter to avoid installation mismatches.

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