Ms27508e18b35p Square Plate Rear Receptacle Ms27508 Series Electrical Circular

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

Part Number Breakdown

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

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.