SY21 Aviation plug:Quick-Lock Bayonet Plastic Waterproof Connector

Key Advantages

• Rapid Bayonet Coupling: The SY21 series is engineered with a high-efficiency bayonet mechanism, allowing for a secure lock in seconds. This is the ultimate choice for projects requiring frequent plug-on/off mating without compromising connection integrity.
• High-Performance Power Range: Supporting a wide electrical spectrum from 5A to 30A, these connectors are versatile enough to handle both sensitive multi-core signal transmissions and heavy-duty power requirements in a compact 21mm frame.
• Flame-Retardant & Lightweight Shell: Constructed from high-grade PC and PA66 (V-0 rating), the housing offers superior chemical resistance and electrical insulation, significantly reducing weight compared to traditional metal aviation plugs.
• Versatile Solder & Screw Termination: Uniquely designed to support both solder and screw clamping, the SY21 allows for quick tool-based wiring, making field maintenance effortless without the need for complex soldering equipment.
• Certified IP67 Environmental Seal: Utilizing premium rubber and epoxy resin sealing, this waterproof plastic connector ensures absolute protection against dust and water immersion, maintaining high reliability in rainy or humid conditions.

Connector drawings

Straight Male Plug	Straight Female Plug
Angle Male Plug	Angle Female Plug

Pins	2	3	4	5	5B	5C	7	7B	9	12	14
Insulator Front View
Rated current(A)	30	30	30	30	5×2 30×3	15	15	15×3 5×4	5	5	5
Contact diameter(mm)	φ3×2	φ3×3	φ3×4	φ3×5	φ3×2 φ1×3	φ2×5	φ2×7	φ2×3 φ1×4	φ1×9	φ1×12	φ1×14
Operating voltage (AC.V)	500	500	500	500	500	500	500	500	500	400	400
Pressure resistance (AC.V) 1 min	1500	1500	1500	1500	1500	1500	1500	1500	1500	1200	1200
Contact resistance (mΩ)	1	1	1	1	1×2 3×3	2.5	2.5	2.5×3 5×4	5	5	5
Wiring method	Solder Screw crimping	Solder Screw crimping	Solder Screw crimping	Solder Screw crimping	Solder Screw crimping	Solder	Solder	Solder	Solder	Solder	Solder
Solder line gauge (mm²/AWG)	≤4.17/11	≤4.17/11	≤4.17/11	≤4.17/11	≤0.75/18 ≤4/12	≤2/14	≤2/14	≤2/14 ≤0.785/18	≤0.785/18	≤0.785/18	≤0.785/18
Screw crimping  line gauge (mm²/AWG)	≤1.5/15	≤1.5/15	≤1.5/15	≤1.5/15	-	-	-	-	-	-	-

Versatile Application Scenarios

1. Medical Devices: Ideal for portable diagnostic equipment requiring frequent sensor plug-ins.
2. Outdoor LED Displays: Secure and fast power/data links for event-based rental screens.
3. Industrial Controllers: Quick-release interfaces for PLC modules and handheld testing tools.
4. Agricultural Sensors: Weatherproof connections for smart irrigation and crop monitoring systems.
5. Smart City Infrastructure: Reliable interconnects for outdoor cameras and traffic sensor arrays.

FAQ