P28 Aviation Connector – Square Flange Socket, Male & Female Circular Butt Joint, 2–24 Pin

P28 series aviation circular connectors (also designated P28K2Q for panel-mount and PLS28 for cable-mount plug) with square flange panel mount configuration. The P28 series uses a 28mm opening diameter — larger than GX20 (20mm) — supporting up to 24 pins in a single connector. The square flange mount provides four-point panel attachment for maximum mechanical stability, preferred over round nut-mount for high-vibration applications and panels requiring precise connector orientation. IP67 rated for outdoor and industrial use.

P28 Series Designation Reference

• P28K2Q: Panel-mount socket with square flange (K2Q = square flange mount). Fixed to panel via four screws through the flange corners.
• PLS28: Cable-mount plug (PLS = plug). Connects to the P28K2Q panel socket.
• Butt joint / docking: Both halves on cable ends for mid-harness connections without panel mounting.

Key Specifications

• Opening Diameter: 28mm
• Pin Configurations: 2, 3, 4, 5, 7, 10, 12, 14, 16, 19, 20, 24 pin (select above)
• IP Rating: IP67
• Current Rating: 5–10A per contact (pin count dependent)
• Voltage Rating: 250V AC/DC
• Shell Material: Zinc alloy, nickel-plated
• Contact Material: Copper alloy, gold-plated
• Mount: Square flange (4× screw holes) or butt joint (select above)

P28 vs GX20 vs M23 — High Pin Count Connector Comparison

• GX20 (20mm, up to 15 pins): Round nut mount. Lower cost. Adequate for most industrial applications up to 15 circuits. Widest accessory availability.
• P28 (28mm, up to 24 pins, this product): Square flange or round mount. Higher pin count than GX20. Square flange provides better panel stability. For applications requiring 16–24 circuits in a single connector.
• M23 (IEC standard, up to 19 pins): Standardized industrial circular connector. Better interchangeability between manufacturers. Higher cost. Preferred for OEM equipment requiring certified components.
• Selection rule: Use GX20 for up to 15 circuits. Use P28 for 16–24 circuits where GX20 is insufficient. Use M23 for OEM applications requiring IEC-standardized connectors.

Frequently Asked Questions

What panel cutout is required for P28 square flange mount?

The P28 square flange mount requires a round panel hole for the connector body (approximately 28mm diameter) plus four screw holes at the flange corners. The exact dimensions depend on the specific variant — verify against the connector datasheet before drilling. The square flange provides four-point attachment, preventing the connector from rotating under torque when the cable connector is mated or unmated.

How does the P28 compare to military circular connectors?

P28 connectors are commercial aviation-style connectors — not MIL-DTL-5015 or MIL-DTL-26482 military circular connectors. They share a similar appearance but use different thread standards, contact sizes, and sealing designs. P28 connectors are not interchangeable with MIL-spec circular connectors. For applications requiring MIL-spec connectors, specify MIL-DTL-5015 or MIL-DTL-26482 series connectors.

What is the maximum current for a P28 24-pin connector?

Current rating decreases as pin count increases due to thermal derating — more contacts in a smaller space generate more heat. For P28 24-pin configurations, verify the specific current rating per contact on the manufacturer’s datasheet. As a general guideline, high pin count configurations (19–24 pin) are typically rated 3–5A per contact. For high-current circuits, use fewer pins and larger contacts (DTP series or Anderson connectors).

Typical Applications

• Industrial machinery: High pin count sensor and actuator connections on complex equipment
• Agricultural equipment: Multi-circuit implement harness connections requiring 16+ circuits
• Stage & entertainment: Multi-circuit outdoor equipment connections
• Military-adjacent: Field equipment connections requiring robust metal shell and high pin count
• Marine: Multi-circuit deck equipment connections

Package Contents

P28 aviation connector (type, pin count, and mount configuration as selected). O-ring, cable entry seals, and coupling hardware included.