Eaton 85100A2255S50 Receptacle - MIL-DTL-26482 SI qualified
Part Number: 85100A2255S50
Quick Summary
The Eaton 85100A2255S50 Receptacle is a MIL-DTL-26482 SI qualified square flange connector used in rugged industrial systems. Design engineers often struggle with compact, high-pin-count interfaces that must perform reliably in challenging environments. This part carries MIL-DTL-26482 SI qualification and REACH compliance, delivering robust performance, while the aluminium shell keeps weight low. Coupled with a 55-contact layout, cadmium plating, and 1/3 bayonet coupling, it enables scalable, field-ready installations. By meeting environmental and regulatory expectations, it reduces risk during audits and simplifies supplier diversification for complex programs. From design to install, the compact form factor supports tight panel densities, while the N-oriented connector and straight backshell streamline assembly. And the included solder cup contacts reduce wiring complexity on field modifications.
Product Information
Extended Description
85100A2255S50 Eaton: Square flange receptacle, straight adaptor, cadmium plating, female solder contacts, pos N; 85100A2255S50
Product Name
Eaton Souriau 851 series MIL-DTL-26482 SI qualified
Catalog Number
85100A2255S50
Product Length/Depth
44 mm
Product Height
40 mm
Product Width
40 mm
Product Weight
58.5 g
Environmental conditions
REACH
Backshell angle
Straight
Backshell type
Adaptor
Connector accessory option
Delivered with connector
Connector orientation
N
Connector type
Receptacle
Contact delivery
Loaded
Contact gender
Socket (Female)
Contact type
Solder Cup
Coupling type
1/3 Bayonet
Layout
55
Plating
Cadmium
Shell material
Aluminium
Shell size
22
Operating temperature - max
125 °C
Operating temperature - min
-40 °C
Receptacle type
Square Flange Receptacle
Number Of Contacts
55
Number of cavity #20
55
Feature: MIL-DTL-26482 SI qualification. Business Impact: Delivers a proven, high-reliability interface that survives shock, vibration, and wide temperature swings, reducing mean time between failures and warranty exposure. Application: Suitable for aerospace, defense, and rugged industrial equipment where interconnects must perform under harsh operating conditions. Feature: 55-contact layout with Solder Cup contacts and socket female. Business Impact: Enables high-density wiring with reliable solder terminations, cutting panel count and assembly time while preserving signal integrity. Application: Complex automation controllers, robotics, and instrumentation panels requiring dense interconnects. Feature: Cadmium plating, aluminium shell, shell size 22. Business Impact: Cadmium plating offers corrosion resistance; aluminium shell reduces weight for easier handling and mount. Application: Field deployable equipment requiring weight saving and corrosion resistance. Feature: Straight backshell adaptor and 1/3 Bayonet coupling; N orientation. Business Impact: Flexible installation options and quick mating, reduces assembly time and prevents misalignment in tight packaging. Application: Systems with limited space and needs for secure retention in high-vibration environments. Feature: Delivered with connector; 44 mm length / 40x40 footprint; 55 contacts; -40 to 125 C. Business Impact: Pre-wired, panel-ready solution that minimizes integration risk and enables consistent performance across extreme temperatures. Application: Military, aerospace, and industrial automation where reliability and footprint consistency matter. Feature: Solder Cup contacts and socket female design. Business Impact: Simplified field wiring and secure terminations, improving maintenance efficiency and repairability. Application: Maintenance-heavy installations and modular control panels.
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FAQs
Mounting the 85100A2255S50 requires a panel with a compatible square flange opening and proper alignment to the connector orientation N. Use the straight backshell adaptor where space is constrained and ensure secure fastening with the appropriate panel hardware. Plan for a clean, metric-based cable exit from the solder cup contacts, and align mating surfaces to avoid cross-threading or misalignment during mating. Verify environmental exposure and torque specs per your assembly procedures to maintain MIL-spec performance over time.
Yes. The 85100A2255S50 is designed as a 55-contact square flange receptacle within the 851 series ecosystem, featuring socket (female) contacts and a 1/3 bayonet coupling for rapid, secure mating. It supports 55 electrical circuits in a high-density layout, enabling dense wiring on control panels while preserving signal integrity. The delivered-with-connector option reduces assembly steps and ensures compatibility with existing 851-series mating interfaces.
MIL-DTL-26482 SI qualification confirms adherence to a mature, high-reliability standard for circular connectors, ensuring robust performance across vibration, shock, and temperature extremes. This interconnects family offers intermateability with MIL-spec mating interfaces, simplifying program procurement and integration. For regulated environments, the qualification aligns with stringent reliability expectations, reducing field failures and improving lifecycle cost management.
Yes. The 85100A2255S50 is REACH compliant, aligning with environmental safety regulations for chemical content. It features cadmium plating, which provides corrosion resistance but may require additional compliance checks for cadmium usage in your region or program. The component is designed for harsh operating conditions ( -40 °C to 125 °C ), supporting reliability in challenging environments while meeting regulatory expectations.
The receptacle measures 44 mm in length, with a 40 x 40 mm footprint and an aluminium shell sized 22, weighing 58.5 g. This compact form factor allows higher panel density without compromising mechanical strength. The high-contact count (55) in a small envelope supports dense cable routing in limited spaces, while the straight orientation and backshell adaptor options facilitate efficient assembly and service access.