Circular Connectors - Backshells and Cable Clamps

Part Number	Description / PDF	Quantity
A850493925A Socapex (Amphenol Pcd)	CONN CABLE CLAMP SZ 25 BLACK	78
A850493821N Socapex (Amphenol Pcd)	CONN CABLE CLAMP SZ 21 SILVER	53
M85049/51-1-22N Socapex (Amphenol Pcd)	CONN CABLE CLAMP SZ 22 SILVER	204
A8504952S8W Socapex (Amphenol Pcd)	CONN CABLE CLAMP SZ 8 OLIVE	11
A8504939S15A Socapex (Amphenol Pcd)	CONN CABLE CLAMP SZ 15 BLACK	27
A8504938S13A Socapex (Amphenol Pcd)	CONN CABLE CLAMP SZ 13 BLACK	6
A8504951S18A Socapex (Amphenol Pcd)	CONN CABLE CLAMP SZ 18 BLACK	56
A8504951124N Socapex (Amphenol Pcd)	CONN CABLE CLAMP SZ 24 SILVER	73
A8504951120N Socapex (Amphenol Pcd)	CONN CABLE CLAMP SZ 20 SILVER	0
A8504952S12N Socapex (Amphenol Pcd)	CONN CABLE CLAMP SZ 12 SILVER	15
A850495118N Socapex (Amphenol Pcd)	CONN CABLE CLAMP SZ 8 SILVER	21
A8504939S17W Socapex (Amphenol Pcd)	CONN CABLE CLAMP SZ 17 OLIVE	20
A8504952124N Socapex (Amphenol Pcd)	CONN CABLE CLAMP SZ 24 SILVER	28
M85049/49-2S16W Socapex (Amphenol Pcd)	CONN CABLE CLAMP SZ 16/17 OLIVE	0
A8504951118N Socapex (Amphenol Pcd)	CONN CABLE CLAMP SZ 18 SILVER	0
M85049/92-19T Socapex (Amphenol Pcd)	COMPOSITE STRAIN RELIEF	25
A8504952110A Socapex (Amphenol Pcd)	CONN CABLE CLAMP SZ 10 BLACK	23
A8504939S25N Socapex (Amphenol Pcd)	CONN CABLE CLAMP SZ 25 SILVER	17
M85049/90-11Z03 Socapex (Amphenol Pcd)	BACKSHELL R/A BAND LOCK D38999 S	49
A8504951122W Socapex (Amphenol Pcd)	CONN CABLE CLAMP SZ 22 OLIVE	14

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