HYSF MCIL21F is the world’s highest-density 21-pin female inline cable connector with Ø15.7 mm PU overmold. IP68 rated, 60 MPa tested, designed for ultimate-channel Gigabit Ethernet + extreme multi-power tethers, ultra-high-density micro-ROV umbilicals, AUV sensor chains, and deepsea inline splicing up to 6000m.

The HYSF MCIL21F pushes the absolute limit of the Micro series — an incredible 21 channels inside the ultra-compact Ø15.7 mm envelope, making it the highest pin-count wet-mate inline connector ever produced under 20 mm. Its 28 mm hex grip and tapered nose ensure fast, reliable mating even in the most confined spaces.
Precision-machined 316L stainless steel insert with gold-plated brass sockets, fully encapsulated in black polyurethane with integrated strain relief. Pre-terminated with 21 color-coded PTFE leads. Supports 1000BASE-T Ethernet (two shielded twisted pairs) while leaving 17 pins for power or additional sensors.
The ultimate choice for next-generation observation-class ROVs, deepsea instrumentation, and Ethernet + extreme multi-power payloads where absolute minimum diameter and maximum channel count are mandatory. ISO9001-2015 certified with 100 MPa burst validation and 1000+ mating cycles under pressure.
Model: MCIL21F
Brand: HYSF
Type: Miniature 21-Core Female Inline Cable
Gender: Female
Pin Count: 21
Contact Material: Gold-plated Brass
Current Rating: 10A per Pin
Voltage Rating: 600V AC/DC
Housing Material: 316L Stainless Steel + PU Overmold
Sealing: Double O-Ring + Face Seal
Body Diameter: Ø15.7 mm
Grip Length: 28 mm
Cable: 21 × 24 AWG PTFE Leads (21-color coded)
Overmold: Black Polyurethane (PU)
Waterproof Rating: IP68
Pressure Rating: 60 MPa (~6000 m)
Operating Temperature: -20°C to 80°C
Application: Ultimate-Density Gigabit Ethernet + Multi-Power Extensions, Extreme ROV Umbilicals, AUV High-Channel Chains, Deepsea Splicing
Certification: ISO9001-2015
Compatibility: MCBH21M / MCIL21M Males
Place of Origin: Guangdong, China
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