HYSF MCIL21M is the world’s highest-density 21-pin male inline cable connector with Ø15.7 mm PU overmold. IP68 rated, 60 MPa tested, perfect 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 MCIL21M achieves the impossible — 21 independent channels inside the ultra-compact Ø15.7 mm Micro envelope, making it the highest pin-count male wet-mate inline connector ever produced under 20 mm. Its compact 19 mm hex grip and threaded locking sleeve guarantee secure mating even in the tightest spaces.
Precision-machined 316L stainless steel insert with gold-plated brass pins, fully encapsulated in black polyurethane with integrated strain relief. Pre-terminated with 21 color-coded PTFE leads. Fully supports 1000BASE-T Ethernet (two shielded twisted pairs) plus 17 additional pins for power or sensors.
The definitive solution for next-generation observation-class ROVs, deepsea instrumentation, and Ethernet + extreme multi-power payloads where absolute minimum diameter and maximum channel count are non-negotiable. ISO9001-2015 certified with 100 MPa burst validation and 1000+ mating cycles under pressure.
Model: MCIL21M
Brand: HYSF
Type: Miniature 21-Core Male Inline Cable
Gender: Male
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: 19 mm
Cable: 21 × 24 AWG PTFE Leads (21-color coded)
Overmold: Black Polyurethane (PU)
Locking: Threaded Sleeve
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: MCBH21F / MCIL21F Females
Place of Origin: Guangdong, China
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