How to Choose D38999 Connectors

How to Choose D38999 Connectors

1. Select the Right Series (Core Mechanical Standard)

D38999 Connector has 3 mainstream series with different locking structures for different usage scenarios :

(1) Series I: Bayonet lock

Fast plug/unplug, scoop-proof. Ideal for equipment requiring frequent disconnection, general aviation & medium vibration devices.

(2) Series II: Double-start bayonet, low-profile

Smaller volume, lightweight, non-scoop-proof. For limited installation space with low vibration.

(3) Series III: Triple-start self-locking thread

Anti-loosening under strong shock & vibration, full environmental sealing. The top choice for military, aerospace, marine and heavy industrial equipment with harsh working conditions.

2. Confirm Shell Size & Contact Layout

1. Shell size: Such as 11, 13, 15, 17, 19, 21, 23, 25, 27, 29, 31, 35. Matches the installation space and contact quantity.

2. Insert arrangement: Choose the pin layout based on your circuit demands (signal, power, high-speed differential signal). Make sure the total number of pins covers all wiring points .

3. Keying code (A/B/C/D/E/N): Different key codes prevent wrong mating between different equipment circuits.

3. Decide Connector Type & Mounting Mode

D38999 Connector body types

(1) Plug (male pin) / Receptacle (female socket)

(2)Straight cable plug / Right-angle cable plug

(3) Wall-mounted receptacle / Flange panel receptacle / PCB tail receptacle (for direct soldering on circuit boards) 

4. Choose Contact Type & Wire Specification

1. Crimp contacts: Most widely used, easy cable assembly, replaceable single pins.

2. PCB solder contacts: For direct board connection, high-speed signal transmission.

3. Special quadrax/triax contacts: For high-frequency, Gigabit Ethernet data transmission.

4. Match AWG wire gauge (20/22/24/26 AWG) with contact current rating.

5. Shell Material & Plating (Adapt to Working Environment)

1. Aluminum alloy (standard): Light weight, general anti-corrosion, for common indoor/airborne equipment.

2. Stainless steel / Titanium: Excellent salt spray & corrosion resistance, for marine, offshore and corrosive chemical environments.

Plating options

(1) Cadmium plating: Strong corrosion resistance, military standard.

(2)Nickel plating: Wear-resistant, anti-oxidation, cost-effective for industrial use.

6. Environmental Performance Requirements

 Wide temperature range (-65℃ ~ 200℃) for high/low temp equipment.

(1) IP67/IP68 sealing grommet: Waterproof & dustproof for outdoor & underwater devices.

(2) 360° full EMI shielding: Required for signal equipment with electromagnetic interference risks.

7. Supporting Accessories

Select matched backshells, cable clamps, sealing gaskets and strain reliefs according to cable outer diameter and bending requirements.

Brief Summary for Customer Communication

When selecting D38999 connectors, we follow 7 key steps: confirm application vibration level to select Series I/II/III; define shell size & pin layout based on wiring quantity; choose panel/cable/PCB mounting type; match crimp/PCB contacts and wire gauge; select shell material & plating for corrosion environment; check temperature, waterproof and shielding standards; equip matched backshell accessories.