Circular Connectors - Backshells and Cable Clamps

Part Number	Description / PDF	Quantity
300388 Amphenol	CONN BACKSHELL BLACK	0
UT0S20JCS Souriau-Sunbank by Eaton	CONN BACKSHELL W/CLAMP SZ20 PG21	0
R85049/88-17W02 TE Connectivity Aerospace Defense and Marine	CONN BACKSHELL BANDING SZ 17 E	0
UT024JCL Souriau-Sunbank by Eaton	CONN BACKSHELL W/CLAMP SZ24 PG29	3
A8504952S32W Socapex (Amphenol Pcd)	CONN CABLE CLAMP SZ 32 OLIVE	47
A850493919A Socapex (Amphenol Pcd)	CONN CABLE CLAMP SZ 19 BLACK	58
IP-UNCK23W PEI-Genesis	UNIVERSAL H/23 OLIVE DRB CAD	49
R85049/90-23Z03 TE Connectivity Aerospace Defense and Marine	R85049/90-23Z03	11
JR25WCC-10(71) Hirose	CONN CABLE CLAMP SZ 25 M28 BLACK	38
97-3057-10 Amphenol Industrial	CONN CABLE CLAMP SZ18 1-20 OLIVE	0
M85049/39S21W	CONN CABLE CLAMP SZ 21 G OLIVE	103
ACT00MB-C-EL00N TE Connectivity DEUTSCH Connectors	S RELIEF STR	84
ACT00WB-F-EL00N TE Connectivity DEUTSCH Connectors	S RELIEF STR	45
R85049/88-25N02 TE Connectivity Aerospace Defense and Marine	CONN BACKSHELL BANDING SZ 25 J	0
R85049/88-21W02 TE Connectivity Aerospace Defense and Marine	CONN BACKSHELL BANDING SZ 21 G	7
M85049/38-9A	CONN CABLE CLAMP SZ 9 A BLK	57
M85049/92-11T Socapex (Amphenol Pcd)	COMPOSITE STRAIN RELIEF	10
A8504938S19W Socapex (Amphenol Pcd)	CONN CABLE CLAMP SZ 19 OLIVE	24
IP-UNAA14A-PG13.5 PEI-Genesis	CG ADAPTER 14 BLACK PG13.5	30
IP-UNCC18ZN PEI-Genesis	UNIVERSAL 18 BLACK ZINC NCKL	93

Circular Connectors - Backshells and Cable Clamps

1. Overview

Circular connectors backshells and cable clamps are critical electromechanical components that ensure secure cable termination, strain relief, and environmental protection in connector systems. Backshells provide mechanical support and shielding for cable-connector junctions, while cable clamps offer strain relief by securing cables to panels or equipment. These components are essential in maintaining signal integrity, preventing mechanical failure, and meeting industry-specific environmental standards across aerospace, industrial automation, and medical device applications.

2. Main Types and Functional Classification

Type	Function Features	Application Examples
Metal Backshells	EMI/RFI shielding, high durability, threaded coupling	Aerospace avionics systems
Plastic Backshells	Lightweight, corrosion-resistant, quick-install design	Industrial IoT sensors
360 Cable Clamps	Full-circle compression, vibration resistance	Robotics joint actuators
Split-shell Clamps	Field-installable, adjustable diameter range	Marine communication systems
EMI Shielded Clamps	Integrated conductive gaskets, grounding contacts	Military radar equipment

3. Structure and Components

Typical backshell assembly consists of: - Housing (aluminum alloy or thermoplastic) - Cable entry port with sealing ring (IP67 rated) - Strain relief mechanism (serrated clamping ring) - EMI shielding fingers (for metallic versions) - Panel mounting threads (UNF or metric) Cable clamp structure includes: - Two-part housing (upper/lower halves) - Elastomer compression sleeve - Threaded locking screws - Cable contact surface (textured for grip) - Optional grounding tab

4. Key Technical Specifications

Parameter	Value Range	Importance
Material Temperature Range	-55 C to +150 C	Operational reliability in extreme environments
IP Protection Rating	IP65-IP68	Dust/water ingress prevention
Cable Diameter Range	2-25mm	Compatibility with various cable sizes
Insertion Force	0.5-5N	Impact on field installation efficiency
Shielding Effectiveness	60-100dB	Signal integrity maintenance
Vibration Resistance	10-2000Hz, 10G	Aerospace/military compliance

5. Application Fields

Aerospace: Flight control systems, satellite communication arrays
Medical: MRI scanners, patient monitoring equipment
Industrial: CNC machine cabling, factory automation sensors
Transportation: Rail signaling systems, EV battery connectors
Defense: Tactical radio systems, weapon guidance electronics

6. Leading Manufacturers and Products

Manufacturer	Representative Product	Key Features
TE Connectivity	Duronic MS Backshell	Quick-disconnect, MIL-DTL-38999 compliant
Amphenol	Series 5000 Cable Clamp	Multi-cable capacity, IP68 rated
Molex	ToughCrimp Shielded Backshell	10G EMI shielding, vibration proof
Weidm ller	PROFIBUS Cable Clamp	Fieldbus protocol optimized design

7. Selection Recommendations

Key selection criteria include: - Environmental factors (temperature, humidity, chemical exposure) - Cable geometry (diameter, jacket material) - Mechanical requirements (vibration, pull-out force) - EMI/RFI shielding needs - Installation constraints (tool access, maintenance frequency) - Compliance standards (MIL-SPEC, IEC 60529) Example: For offshore wind turbine sensors, select stainless steel backshells with IP68 clamps and neoprene sealing to withstand saltwater corrosion and mechanical shock.

8. Industry Trends

Current development trends include: - Hybrid connectors integrating optical and electrical backshells - Additive manufacturing for custom cable clamp geometries - Smart clamps with embedded strain gauges for condition monitoring - Nano-coatings for enhanced corrosion resistance - Miniaturization for UAV and wearable medical device applications - Sustainability focus: Recyclable thermoplastic formulations