Ms27508e18b35p Square Plate Rear Receptacle Ms27508 Series Electrical Circular Connector
MS27508E18B35P Environment-Resistant Plug, MIL-DTL-27508
The MS27508E18B35P is a triple-start threaded circular electrical connector environment-resistant plug designed for aerospace, avionics, and industrial platforms. It conforms to MIL-DTL-27508 (formerly MS27508) requirements. Note: MS27508 is a distinct standard from MIL-DTL-38999 / GJB599 and from MIL-DTL-27497, and is not directly form-fit-function interchangeable with D38999/J599 Series III or MS27497 connectors.
This environment-resistant plug features shell size 18 (approximately equivalent to D38999 shell size G / 19), insert arrangement 18B-35 (13 contacts: 13 x #22D signal, Service Class M - sealed), pin contacts (P), and normal keying (no suffix). The "E" style designation indicates an environment-resistant / sealed construction. The design supports EMI shielding, scoop-proof mating, self-locking threaded coupling, and removable crimp contacts.
Product Features
- Conformant to MIL-DTL-27508 (MS27508) circular connector standard
- NOT directly interchangeable with MIL-DTL-38999 / GJB599 Series III or MIL-DTL-27497 (MS27497) connectors
- Triple-start threaded self-locking coupling for high-vibration retention
- Environment-resistant plug style (E designation) for harsh-environment cable-end mating
- Conductive shell for EMI shielding and corrosion resistance
- Sealed signal configuration with insert arrangement 18B-35: 13 x #22D signal contacts (Service Class M - sealed)
- Pin contacts (P) for mating with socket-contact receptacles
- Normal keying (no suffix) for standard polarization and anti-mismatch mating
Technical Specifications - MS27508E18B35P
| Parameter | Value |
|---|---|
| Part Number | MS27508E18B35P |
| Standard | MIL-DTL-27508 (MS27508) |
| Connector Type | Environment-resistant plug (MS27508 style E) |
| Coupling | Triple-start threaded, self-locking |
| Shell Finish / Material | Environment-resistant per MS27508 style E designation (confirm with supplier for exact finish) |
| Shell Size | 18 (approximately D38999 shell size G / 19) |
| Insert Arrangement | 18B-35 (13 contacts: 13 x #22D signal, Service Class M - sealed) |
| Contact Gender | P - Pin contacts (crimp, removable) |
| Keying / Polarization | Normal (no suffix) - standard keying |
| Cable End Style | Environment-resistant plug (cable end, mating with receptacle) |
| Shielding | EMI shielded (conductive shell) |
| Operating Temperature | Approximately -65°C to +150°C (confirm with supplier for exact class) |
| Compatible Mating | MS27508 receptacle of same shell size 18, arrangement 18B-35, socket contacts, and normal keying. NOT compatible with D38999/J599 Series III or MS27497 receptacles. |
Part Number Breakdown
| Segment | Meaning |
|---|---|
| MS27508 | MIL-DTL-27508 circular connector standard |
| E | Connector style: environment-resistant plug (MS27508 designation) |
| 18 | Shell size 18 (approx. D38999 shell size G / 19) |
| B | Shell letter designator for insert arrangement capacity |
| 35 | Insert arrangement 35 (18B-35, 13 x #22D signal, Service Class M - sealed) |
| P | Pin contacts |
Related options: MS27508R18B35SN receptacle (socket contacts, normal keying); MS27508E18B35S plug with socket contacts; MS27508E16B35P for shell size 16 (approx. D38999 size F / 17); MS27508E18B98P non-sealed arrangement. Important: MS27508 (MIL-DTL-27508), MS27497 (MIL-DTL-27497), and D38999/J599 (MIL-DTL-38999/GJB599) are separate standards and are NOT form-fit-function interchangeable.
Compatible Applications
The MS27508E18B35P environment-resistant plug is intended for platforms that require MIL-DTL-27508 compliant threaded interconnects with medium-count sealed signal circuits in shell size 18, using pin contacts. Typical use cases include:
- Aircraft and helicopter wiring harness cable ends (MIL-DTL-27508 standard)
- Avionics LRUs, radar, and communication equipment
- Ground vehicles and rugged electronic enclosures
- Shipboard and outdoor equipment requiring sealed circular connectors
- Programs that standardize on MIL-DTL-27508 (MS27508) interfaces
Selection Guide
| Requirement | Recommended Choice |
|---|---|
| Environment-resistant plug, size 18 / arrangement 35 / pins / normal keying / sealed (MS27508) | MS27508E18B35P - this product |
| Mating receptacle with socket contacts | MS27508R18B35SN |
| Socket contact version of this plug | MS27508E18B35S |
| Smaller shell size (16) with same arrangement | MS27508E16B35P |
| Non-sealed signal layout (Service Class I) | MS27508E18B98P |
Installation Notes
- Verify shell size, insert arrangement, contact gender, and normal keying before mating.
- Use the correct crimp tooling for #22D signal contacts specified by arrangement 18B-35.
- Fully engage the triple-start threaded coupling with the mating MS27508 receptacle until the self-locking mechanism is seated.
- Mate only with MS27508 receptacles of the same shell size, arrangement, opposite contact gender (socket), and normal keying. Note: 18B-35 is Service Class M (sealed) — suitable for applications requiring environmental sealing.
- Do NOT attempt to mate with D38999/J599 Series III or MS27497 receptacles — MS27508 is a different standard and is not interchangeable.
Why Choose MS27508E18B35P
MIL-DTL-27508 Compliance
Choosing MS27508E18B35P ensures compliance with MIL-DTL-27508 (formerly MS27508) requirements for programs that mandate this specific standard. The environment-resistant plug geometry supports reliable cable-end interconnect with sealed signal capability, pin contacts, and normal keying for aerospace and industrial systems. Note: this connector is NOT a direct replacement for D38999/J599 Series III or MS27497 parts.
Ordering Information
Order by the MS27508 designation MS27508E18B35P. When requesting a quote, please confirm mating receptacle part number (socket contacts), shell finish class, contact plating, and required quantity. Note: 18B-35 is Service Class M (sealed); specify 18B-98 or 18B-02 for non-sealed applications.
Get in Touch
Have questions about our products or want to discuss a custom order? Our team is ready to help you.