ITT Cannon KJA D38999 Series III Connector Guide
ITT Cannon KJA D38999 Series III Connector Guide
ITT Cannon KJA connectors are D38999-style Series III circular connectors designed for harsh military and aerospace environments. They combine a compact metal shell, high-density contact arrangements, environmental sealing and a triple-start threaded coupling system with anti-decoupling protection.
KJA connectors are available as wall-mount receptacles, selected box-mount receptacles, straight plugs and jam-nut receptacles. Available configurations include standard signal contacts, power contacts, PCB contacts and selected coaxial or high-speed data arrangements.
The KJA family is suitable for aircraft, military vehicles, radar, communication systems, aircraft engines, unmanned systems and other equipment exposed to vibration, shock, temperature changes, dust and moisture.
KJA Series Key Selection Parameters
| Parameter | KJA Series options |
|---|---|
| Connector type | Circular metal connector |
| Product family | D38999-style Series III |
| Coupling | Triple-start threaded, self-locking |
| Shell styles | Wall mount, selected box mount, straight plug and jam-nut receptacle |
| Shell sizes | KJA sizes 9 to 25, depending on configuration |
| Contact types | Pin or socket |
| Termination | Rear-release crimp; selected PCB and special-contact versions |
| Contact sizes | 22D, 20, 16, 12 and selected coaxial/high-speed contacts |
| Contact arrangements | Low-density power through high-density signal configurations |
| Polarization | N, A, B, C, D and E |
| Standard shell material | Aluminum alloy |
| Common finishes | Electroless nickel, olive-drab cadmium, zinc-nickel and selected space-grade finishes |
| Temperature range | Up to −65°C to +200°C, depending on finish and configuration |
| Durability | Typically 500 mating cycles for aluminum Series III configurations |
| Main applications | Aerospace, defense, radar, avionics, communications and unmanned systems |
The current ITT Cannon product page describes KJA/KJB as D38999-style Series III connectors designed for harsh military and aerospace applications. Qualification, QPL status and the exact performance requirements must be confirmed for the specified part number and manufacturing source.
KJA Shell Styles
The number following the KJA prefix identifies the basic shell style.
| KJA designation | Connector style | D38999-style relationship | Installation |
|---|---|---|---|
| KJA0 | Wall-mount receptacle | D38999/20-style | Four-hole flange panel mounting |
| KJA5 | Box-mount receptacle | Special configuration | Fixed equipment or PCB interface |
| KJA6 | Straight plug | D38999/26-style | Free-hanging cable connection |
| KJA7 | Jam-nut receptacle | D38999/24-style | Single-hole bulkhead mounting |
KJA5 availability depends on the required configuration and should be confirmed with the manufacturer.
KJA0 Wall-Mount Receptacle
KJA0 is a flange-mounted receptacle installed on an equipment enclosure or panel. It is generally used with a compatible KJA6 straight plug.
KJA0 is suitable for:
Avionics enclosures
Radar electronics
Communication equipment
Ground vehicles
Aircraft engine controls
Power and signal distribution boxes
The panel cutout, mounting-hole spacing, shell size, insert arrangement and rear accessory must be checked before installation.
KJA6 Straight Plug
KJA6 is the cable-mounted straight plug and one of the most common KJA shell styles. It uses a threaded coupling nut and normally mates with a compatible KJA0 wall-mount or KJA7 jam-nut receptacle.
Typical KJA6 part numbers include:
KJA6T13F35PN
KJA6T17F6PN
KJA6T19F32PN
KJA6T19W32SN
KJA6T21F35PN27
KJA6T23W21PN
KJA6T23W35PNL
KJA6T25F35SN
KJA6T25F43PN
KJA7 Jam-Nut Receptacle
KJA7 is installed through a single panel opening and secured with a jam nut. It is useful where the rear of the panel is difficult to access or where four flange-mounting screws are undesirable.
Typical KJA7 part numbers include:
KJA7T11F35PN
KJA7T19W32SN
KJA7T21F35PN
KJA7T23W35SN
KJA7T25W42SN
KJA7 receptacles must be selected according to the allowable panel thickness, mounting-flat orientation and required sealing hardware.
Popular ITT Cannon KJA Part Numbers
| Part number | Shell style | Positions | Contact configuration | Finish | Polarization |
|---|---|---|---|---|---|
| KJA6T9F35PN | Straight plug | 6 | Pin, crimp | Electroless nickel | Normal |
| KJA6T13F35PN | Straight plug | 22 | Pin, crimp | Electroless nickel | Normal |
| KJA6T17F6PN | Straight plug | 6 | Pin, larger power contacts | Electroless nickel | Normal |
| KJA6T19F32PN | Straight plug | 32 | Pin, crimp | Electroless nickel | Normal |
| KJA6T19W32SN | Straight plug | 32 | Socket, crimp | Olive-drab cadmium | Normal |
| KJA6T21F35PN27 | Straight plug | 79 | Pin, crimp, modification 27 | Electroless nickel | Normal |
| KJA6T23W21PN | Straight plug | 21 | Pin, crimp | Olive-drab cadmium | Normal |
| KJA6T23W35PNL | Straight plug | 100 | Pin version supplied without contacts | Olive-drab cadmium | Normal |
| KJA6T25F35SN | Straight plug | 128 | Socket, crimp | Electroless nickel | Normal |
| KJA7T25W42SN | Jam-nut receptacle | 42 | 38 size-20 sockets and 4 size-8 coaxial positions | Olive-drab cadmium | Normal |
The table provides representative configurations. The manufacturer drawing and current datasheet should be used to confirm contacts, accessories, environmental ratings and availability.
KJA vs KJL vs KJ
| Series | D38999 style | Coupling | Main advantage |
|---|---|---|---|
| KJL | Series I | Three-point bayonet | Scoop-proof construction and broad aerospace use |
| KJ | Series II | Three-point bayonet | Lower-profile and reduced-weight installation |
| KJA/KJB | Series III | Triple-start threaded | Strong anti-decoupling performance for high vibration |
KJA vs KJB
KJA and KJB belong to the same D38999-style Series III platform. KJA configurations use an all-metal contact-retention system, while selected KJB configurations use a different retention construction. Available materials, finishes and special versions vary between the two families.
The series prefix must not be changed without checking:
Contact-retention design
Shell material
Insert arrangement
Environmental performance
Required accessories
Program qualification
Manufacturer availability
KJA Aluminum vs Series III Composite
| Feature | KJA aluminum | Series III composite |
|---|---|---|
| Shell material | Aluminum alloy | Composite |
| Weight | Standard Series III weight | Lower weight |
| Coupling | Triple-start threaded | Triple-start threaded |
| Scoop-proof | Yes | Yes |
| Typical durability | 500 mating cycles | Up to 1,500 mating cycles |
| Main reason to select | Established metal-shell interface and EMI bonding | Weight and corrosion reduction |
Composite connectors should not be substituted automatically for an aluminum KJA connector. Panel grounding, EMI performance, accessory compatibility and program approval must be reviewed.
Main Applications
Military Aircraft
KJA connectors are used for avionics, communication, navigation, engine control and aircraft power or signal distribution.
Radar and Communication Systems
High-density arrangements support multiple signal paths in radar processors, radios, antenna systems and secure communication equipment.
Military Ground Vehicles
The threaded anti-decoupling mechanism is suitable for vehicle electronics exposed to shock and sustained vibration.
Aircraft Engines
High-temperature finishes and secure coupling support sensors, controls and electrical systems installed around aircraft engine environments.
Unmanned Systems
Compact high-density arrangements reduce connector size and harness weight in UAVs and other unmanned platforms.
Test and Ground Support Equipment
KJA connectors provide removable interfaces for aerospace test racks, maintenance systems and ground-support electronics.
ITT Cannon KJA Stock and RFQ
DataStorageIC supplies ITT Cannon KJA D38999-style Series III connectors, contacts and accessories for aerospace, defense, communication and industrial applications.
Please provide the complete KJA part number, required quantity, target delivery date and qualification or traceability requirements. Contact us to check stock, lead time, datasheets, mating connectors, contacts, backshells and possible D38999 cross-reference options.
