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{"title":"IP68 Outdoor Waterproof Connectors M21 Straight Assembled Plug Soldering Wire","imgUrl":"https:\/\/img.chinax.com\/nimg\/31\/2e\/b30c81a54fd3fcdda2b14693548f-200x200-1\/ip68_outdoor_waterproof_connectors_m21_straight_assembled_plug_soldering_wire.jpg","attrs":{"Supply Ability":"Can produce 10 million sets of wire harnesses annually","Model Number":"m21 waterproof plug","Contact Material":"Phosphor Bronze, Gold Plated","Minimum Order Quantity":"10 sets"}}
{"title":"M16 M20 Wire Waterproof Outdoor Lighting Connectors Male Female Straight Screw","imgUrl":"https:\/\/img.chinax.com\/nimg\/3b\/2e\/0d3615aff93ccad8422ab81ccf75-200x200-1\/m16_m20_wire_waterproof_outdoor_lighting_connectors_male_female_straight_screw_lock_ip67.jpg","attrs":{"Supply Ability":"Can produce 10 million sets of wire harnesses annually","Model Number":"m20 assembly plug","Contact Material":"Phosphor Bronze, Gold Plated","Price":"3 USD -5 USD"}}
{"title":"M16 4 Pin Male Plug And Female Socket IP68 Waterproof Quick Lock Connector For","imgUrl":"https:\/\/img.chinax.com\/nimg\/db\/75\/48d6fb327a2a903d4d3e3e7c7a44-200x200-1\/m16_4_pin_male_plug_and_female_socket_ip68_waterproof_quick_lock_connector_for_outdoor_lighting.jpg","attrs":{"Supply Ability":"Can produce 10 million sets of wire harnesses annually","Model Number":"M16 waterproof plug","Contact Material":"Phosphor Bronze, Gold Plated","Minimum Order Quantity":"10 sets"}}
{"title":"M16 Threaded Panel Mount Aviation Plug Signal Connector IP67 Waterproof","imgUrl":"https:\/\/img.chinax.com\/nimg\/6e\/37\/6544240082b044f981b2cdf146e1-200x200-1\/m16_threaded_panel_mount_aviation_plug_signal_connector_ip67_waterproof_dustproof_plastic_pa.jpg","attrs":{"Supply Ability":"Can produce 10 million sets of wire harnesses annually","Model Number":"Three-way round waterproof connector","Contact Material":"Phosphor Bronze, Gold Plated","Minimum Order Quantity":"10 sets"}}
{"title":"M12 Waterproof IP67 Female Panel Mount Connector Screw Lock Industrial Circular","imgUrl":"https:\/\/img.chinax.com\/nimg\/28\/44\/f648d5ea370937617a7040150e20-200x200-1\/m12_waterproof_ip67_female_panel_mount_connector_screw_lock_industrial_circular_connector.jpg","attrs":{"Supply Ability":"Can produce 10 million sets of wire harnesses annually","Model Number":"M12 waterproof plug","Contact Material":"Phosphor Bronze, Gold Plated","Price":"2 USD -3 USD"}}
{"title":"M25 Female Socket Quick Lock Connector 2+1+5 For Shared Electric Bikes Charging","imgUrl":"https:\/\/img.chinax.com\/nimg\/5a\/f6\/b8be71153c767b17fee94bf34e6c-200x200-1\/m25_female_socket_quick_lock_connector_2_2b1_2b5_for_shared_electric_bikes_charging_2f_discharging.jpg","attrs":{"Supply Ability":"Can produce 10 million sets of wire harnesses annually","Model Number":"M25 Face Recognition Female Socket","IP Protection Rating":"IP66","Minimum Order Quantity":"5 sets"}}
{"title":"M16 3 Pin Outdoor Waterproof Connectors IP67 IP68 Waterproof Cable Assembly","imgUrl":"https:\/\/img.chinax.com\/nimg\/f3\/fb\/23d6ad844f80654dbec6097b6bab-200x200-1\/m16_3_pin_outdoor_waterproof_connectors_ip67_ip68_waterproof_cable_assembly.jpg","attrs":{"Supply Ability":"Can produce 10 million sets of wire harnesses annually","Model Number":"M16 waterproof plug","Contact Material":"Phosphor Bronze, Gold Plated","Minimum Order Quantity":"5 sets"}}
The M21 Assembly Plug (also known as M21 field-wireable plug, 21 mm threaded circular connector, SP21-class assemblable plug) is a 21 mm-class threaded circular interconnect designed for ≈21 mm panel cut-outs with M21-class coupling nuts. As the larger sibling of the SP17 and positioned just below M25 in current capability, it offers robust performance: 2-pin configurations handle 25-30 A at 300-500 V AC/DC, 3/4-pin versions manage 12-15 A, 5-pin handles 5 A, and up to 12-pin signal versions support 5 A. Standard IP67 protection is available with optional IP68 rating when mated.
The "Assembly" designation means the plug body ships disassembled, allowing users to bring their own cable, strip and solder/screw conductors into the contact carrier, clamp the rear gland, and lock the coupling nut. It follows the same 21 mm form factor as the widely used SP21/MP-T21 family, ensuring compatibility with standard 21 mm panel sockets.
Key Advantages
High Current Capacity: 25-30 A in 2-pin configuration within a 21-mm shell
Field Flexibility: Cut-to-length capability with no mold MOQ requirements
Superior Protection: IP67 standard with optional IP68 rating for harsh environments
Versatile Configuration: 2-12 pin options with power+signal hybrid capabilities
Premium Contacts: Gold-plated brass contacts with ≤5 mΩ resistance
Vibration Resistant: Threaded locking mechanism outperforms bayonet in high-vibration applications
Cost Effective: Lower BOM than M25 and more affordable than metal aviation connectors
Technical Specifications
Parameter
Specification
Coupling / Cut-out
≈21 mm nut OD / 21 mm panel hole
Pin Configurations
2-12 pins (common: 2/3/4/5/7)
Rated Current
25-30 A (2P), 12 A (3P), 6 A (4P), 5 A (5/7/9/12P)
Rated Voltage
300 V (2P 25 A), 250 V (3/4P), 500 V (SP21 2P class), 110 V (5P)
Contact Resistance
≤ 5 mΩ
Insulation Resistance
≥ 100 MΩ @ 500 V DC (≥10¹⁰ Ω premium)
Withstand Voltage
1500-2000 V AC / 1 min
Protection Rating
IP67 standard / IP68 optional (mated)
Cable OD Range
4.5-7 mm / 7-12 mm (dual gland)
Wire Gauge
0.3-2.5 mm² (22-12 AWG)
Operating Temperature
-25…85 °C dynamic / -40…105 °C static
Shell Material
PA66+GF V0 / PC
Mating Cycles
≥ 500
Certifications
CE, RoHS, REACH, TÜV/UL (brand dependent)
Design Features
Coupling: M21-class ≈21 mm nut OD, threaded fine-pitch lock
Stage & Event: Outdoor LED decor trees, temporary performance light power joins, portable generator auxiliary outlets
Company Details
Bronze Gleitlager
,
Bronze Sleeve Bushings
and
Graphite Plugged Bushings
from Quality China Factory
Business Type:
Manufacturer
Year Established:
October 20
Total Annual:
>50 million RMB
Employee Number:
>100 people+
Ecer Certification：
Verified Supplier
Shenzhen Jianhong Technology Co., Ltd.
Shenzhen Jianhong Technology Co., Ltd. is a professional and reliable manufacturer specializing in the R&D, production and sales of high-quality waterproof connectors. With 20 years of rich manufacturing experience in the connector industry, we have been ...
Shenzhen Jianhong Technology Co., Ltd.
Shenzhen Jianhong Technology Co., Ltd. is a professional and reliable manufacturer specializing in the R&D, production and sales of high-quality waterproof connectors. With 20 years of rich manufacturing experience in the connector industry, we have been ...
