Eaton 85100E2221SY50 Receptacle - MIL-DTL-26482 SI
Part Number: 85100E2221SY50
Quick Summary
The Eaton 85100E2221SY50 Receptacle is a MIL-DTL-26482 SI qualified connector solution for rugged harness assemblies. Engineers often struggle with reliable mating under vibration, corrosion risk, and limited panel space, and this receptacle addresses those challenges with a compact square flange design and a backnut. MIL-DTL-26482 SI qualified ensures military-grade interchangeability, while REACH compliance supports global regulatory alignment; cadmium plating provides robust corrosion resistance for harsh environments. The aluminium shell and cadmium finish together offer durable protection in demanding applications. This square flange receptacle with solder cup contacts and a 1/3 bayonet coupling supports straightforward installation, compatibility with 21 contacts, and orientation Y, making it well suited for aerospace, defense, and complex industrial equipment.
Product Information
Extended Description
85100E2221SY50 Eaton: Square flange receptacle, with backnut, cadmium plating, female solder contacts, pos Y; 85100E2221SY50
Product Name
Eaton Souriau 851 series MIL-DTL-26482 SI qualified
Catalog Number
85100E2221SY50
Product Length/Depth
34.5 mm
Product Height
40 mm
Product Width
40 mm
Product Weight
60.5 g
Environmental conditions
REACH
Backshell angle
Straight
Backshell type
Backnut
Connector accessory option
Delivered with connector
Connector orientation
Y
Connector type
Receptacle
Contact delivery
Loaded
Contact gender
Socket (Female)
Contact type
Solder Cup
Coupling type
1/3 Bayonet
Layout
21
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
21
Number of cavity #16
21
Feature: 21 contact positions with socket female solder cup contacts; Business Impact: enables full 21-circuit interconnection in a compact 34.5 mm depth while preserving signal integrity; Application: harness connections in aerospace and industrial machinery, reducing harness complexity and improving reliability. Feature: Backnut-backed, straight backshell; Business Impact: delivers secure mechanical retention against vibration and environmental exposure; Application: panel-mounted control units and avionics enclosures where vibration is common. Feature: Cadmium plating on an aluminium shell with shell size 22; Business Impact: provides robust corrosion resistance with lightweight construction; Application: harsh environments such as aerospace, defense, and Marine/industrial ecosystems. Feature: 1/3 Bayonet coupling and orientation Y; Business Impact: fast, repeatable mating with a positive lock; Application: field servicing and quick-replace scenarios without sacrificing reliability. Feature: Delivered with connector and 34.5 mm length; Weight 60.5 g; Business Impact: easy handling and installation in constrained spaces; Application: compact instrumentation panels and small-dimension harness assemblies.
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FAQs
Installation begins with aligning the square flange receptacle to the mounting surface, then securing it with the backnut. The unit is delivered with the connector, uses a straight backshell, and supports Y orientation. With 21 solder-cup contacts, you can complete a 21-circuit interconnection in tight spaces while maintaining proper strain relief and vibration resistance.
This receptacle supports 21 copper conductors in solder-cup format, with a cadmium-plated aluminium shell for corrosion resistance. Operating temperature ranges from -40 °C to 125 °C, and it is REACH compliant. The MIL-DTL-26482 SI qualification guarantees interchangeability and rugged performance in demanding environments.
Yes. The 85100E2221SY50 belongs to the Souriau 851 series and is MIL-DTL-26482 SI qualified, making it ideal for aerospace and defense harnesses. Its square flange receptacle design, backnut, and 1/3 bayonet coupling provide reliable mating under vibration, while the 21-contact configuration supports complex signal and power needs.
It is MIL-DTL-26482 SI qualified, which ensures military-grade interchangeability, and it is REACH compliant for broader regulatory alignment. The cadmium plating and aluminium shell contribute to corrosion resistance and weight savings—important considerations for compliant, durable installations in harsh environments.
The 85100E2221SY50 reduces field failures through robust vibration resistance and corrosion protection, speeds up assembly with quick mating via the 1/3 bayonet coupling, and lowers maintenance costs due to durable materials. Its 21-contact configuration supports multifunction harnessing, delivering measurable ROI in uptime, efficiency, and lifecycle costs.