Ms27508e18b35pb Square Plate Rear Receptacle Electrical Circular Mil Connector

MS27508E18B35PB Environment-Resistant Plug, MIL-DTL-27508

The MS27508E18B35PB is an environment-resistant circular electrical connector plug designed for aerospace, avionics, and industrial platforms. It conforms to MIL-DTL-27508 (formerly MS27508) requirements. Note: MIL-DTL-27508 is a distinct standard, separate from MIL-DTL-38999 / GJB599, MIL-DTL-27484 (MS27484), MIL-DTL-27497 (MS27497), MIL-DTL-27473 (MS27473), MIL-DTL-26482 (62GB), JY27466 (GJB), 8D series, Y50 series, YLH series, ZH8525 series, YH3116 series, YW1 series, and SMA RF coaxial connectors, and is not directly form-fit-function interchangeable with any of those connectors unless confirmed by the supplier.

This environment-resistant plug features shell size 18 (approximately equivalent to D38999 shell size F / 19), shell letter B, insert arrangement 18B-35 (13 contacts: 13 x #22D signal, Service Class M - sealed), pin contacts (P), and a "B" keying/variant code (non-standard — confirm exact meaning with supplier). 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, MIL-DTL-27484 (MS27484), MIL-DTL-27497 (MS27497), MIL-DTL-27473 (MS27473), MIL-DTL-26482 (62GB), JY27466 (GJB), 8D series, Y50 series, YLH series, ZH8525 series, YH3116 series, YW1 series, or SMA RF coaxial connectors unless confirmed by supplier
• Environment-resistant plug construction (E style) with sealed / environment-resistant design
• Shell size 18 (approximately D38999 shell size F / 19), shell letter B
• 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 connectors
• "B" non-standard keying/variant code — confirm exact meaning with supplier
• EMI shielded (conductive shell), scoop-proof, crimp removable contacts

Technical Specifications - MS27508E18B35PB

Part Number Breakdown

Related options: MS27508E18B35SB with socket contacts; MS27508E16B35PB for smaller shell size 16 (approx. D38999 size E / 17); MS27508R18B35SB mating receptacle with socket contacts; MS27508E18B98PB non-sealed arrangement (13 contacts, Service Class I). Important: The "B" keying/variant code is non-standard — confirm availability and meaning with supplier before procurement. MIL-DTL-27508, YW1 series, SMA RF coaxial, YH3116 series, ZH8525 series, YLH series, Y50 series, 8D series, JY27466 (GJB), MIL-DTL-26482 (62GB), MS27473 (MIL-DTL-27473), MS27484 (MIL-DTL-27484), MS27497 (MIL-DTL-27497), and D38999/J599 (MIL-DTL-38999/GJB599) are separate standards and are NOT form-fit-function interchangeable unless confirmed by supplier.

Compatible Applications

The MS27508E18B35PB connector is intended for platforms that require MIL-DTL-27508 compliant interconnects in shell size 18 with environment-resistant sealed signal circuits. Typical use cases include:

• Aircraft and helicopter wiring harness interconnects (MIL-DTL-27508 standard)
• Avionics LRUs, radar, and communication equipment
• Ground vehicles and rugged electronic enclosures
• Shipboard and industrial equipment requiring sealed circular connectors
• Programs that standardize on MIL-DTL-27508 (MS27508) interfaces

Selection Guide

Installation Notes

• Verify shell size 18, insert arrangement 18B-35, pin contacts, and "B" keying/variant code before mating. Confirm the meaning of the "B" keying code with supplier.
• Use the correct crimp tooling for #22D signal contacts specified by arrangement 18B-35.
• Fully engage the threaded coupling with the mating MS27508 connector until securely seated.
• Mate only with MIL-DTL-27508 (MS27508) connectors of the same shell size 18, shell letter B, arrangement 18B-35, opposite contact gender (socket), and matching "B" keying. Note: arrangement 18B-35 is Service Class M (sealed) — suitable for environments requiring environmental sealing.
• Do NOT attempt to mate with D38999/J599 Series III, MS27484, MS27497, MS27473, 62GB/MIL-DTL-26482, JY27466, 8D, Y50, YLH, ZH8525, YH3116, YW1 series, or SMA RF coaxial connectors — MIL-DTL-27508 is a different standard and is not interchangeable unless confirmed by supplier.

Why Choose MS27508E18B35PB

MIL-DTL-27508 Compliance

Choosing MS27508E18B35PB ensures compliance with MIL-DTL-27508 (MS27508) requirements for programs that mandate this specific standard. The connector geometry supports reliable interconnect with environment-resistant sealed signal pin contacts and "B" keying for aerospace and industrial systems. Note: this connector is NOT a direct replacement for D38999/J599 Series III, MS27484, MS27497, MS27473, 62GB/MIL-DTL-26482, JY27466, 8D, Y50, YLH, ZH8525, YH3116, YW1 series, or SMA RF coaxial parts. The "B" keying/variant code is non-standard — confirm availability with supplier. Confirm exact specifications and interchangeability with supplier.

Ordering Information

Order by the designation MS27508E18B35PB. When requesting a quote, please confirm mating connector part number (socket contact receptacle with matching "B" keying), shell finish, contact plating, "B" keying/variant code meaning and availability, and required quantity. Note: arrangement 35 is Service Class M (sealed); specify arrangement 98 for non-sealed Service Class I applications.