Backshell Types: Complete Selection Guide
How to choose the right backshell for your connector application.
Quick Definition
A backshell is a mechanical housing that threads onto the rear of a connector, providing strain relief, cable protection, and often EMI shielding termination. Available in straight, 45 degree, and 90 degree configurations.
Backshell Configurations
Straight
Direct rear exit
45 Degree Angle
Angled exit
90 Degree Angle
Side exit
Backshell Types Comparison
| Type | Angle | Best For | Pros |
|---|---|---|---|
| Straight | 0 degrees | Rear panel, straight cable runs | Compact, easy assembly |
| 45 Degree Angle | 45 degrees | Angled exits, limited space | Good compromise |
| 90 Degree Angle | 90 degrees | Side exits, low profile | Reduces cable stress |
| Self-Locking | Various | High vibration | Prevents loosening |
| EMI/RFI | Various | Shielded cables | 360 degree shield termination |
| Environmental | Various | Harsh conditions | Sealing, strain relief |
How to Select a Backshell
1. Match the Connector
Backshells are connector-specific. Match the shell size (8, 10, 12, 15, 19, 23, 25) and thread type (MIL-C-38999, MIL-C-26482, etc.).
2. Check Cable OD
Ensure the backshell cable entry accommodates your cable diameter. Most use interchangeable grommets or bushings for different cable sizes.
3. Consider the Environment
Need EMI protection? Choose an EMI backshell with 360 degree shield termination. Need environmental sealing? Choose an environmental backshell with O-ring seals.
4. Choose the Exit Angle
Use straight for direct runs. Use 45 degree or 90 degree when space is limited or to reduce cable bend stress at the connector.
Frequently Asked Questions
Related Glossary Terms
Design Connectorized Assemblies
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