The key to successful backshell selection is proper product application. To do this, a complete description of the backshell's intended use is required. The more complex the application is, the more detailed the questions become. The following are basic application requirements:
- Connector type; part number
- Cable or wire bundle diameter, including detailed description of cable make-up
- Intended environment; shipboard, space, airframe, ground support, etc.
- Restrictions; size, shape, weight, etc.
- Performance required; strain-relief, water-tight, moisture-resistant, shield termination, working room, repairable, potted or molded, light, medium or heavy duty product performance per MIL-C-85049 or a MS product required
Shield terminating backshells require detailed cable construction description, and application definition. There is no panacea to shield terminations, or any one method that meets a majority of requirements. Band-it bands are the most universal termination method. However, bands require special tools to install. Backshell manufacturers have several designs to meet each requirement. The following are the basic or common designs:
- Multiple conical rings
- Single conical ring, internal chamfer seat
- Castellated or splined ring
- Lampbase thread ring
- Crimp ring
- Radial compression spring
- Magformed or crimp ring with shield sock and shrink boot
- Band-it Bands
All of the basic shield ring designs have specific uses and are manufactured by Glenair, Inc. The one you select depends on many factors. Costs, repairability, shield type, shield effectiveness, shield termination method, shield construction, shield combinations, cable type, cable jacket thickness, cable diameter tolerance, product performance, weight, working room, temperature, shock, vibration, strain-relief, dissimilar metals, corrosion, etc. The primary factor is cable construction--what type of shield is being terminated, where is the shield or combination of shields located within the cable or wire bundle, and type of outer jacket construction are key factors. Customer preference, established methods and practices, tradition, manual skill level and inspection must also be considered.
Diagrams on this page...
Standard Shield Termination Design
Basic Backshell Configurations
Standard Shield Termination Design
Multiple Conical Rings
380-001Dual Ring, C-BoreHeavy Duty MIL-C-85049/23,/24,/25 Overall Shield |
|
380-086Dual Ring, C-BoreHeavy Duty Individual and/or Overall Shield |
|
380-018Triple Ring, C-BoreMedium Duty Individual and/or Overall Shield |
|
380-071Internal RingHeavy Duty MIL-DTL-28840/6 Individual and/or Overall Shield |
Single Conical Rings
380-013Single RingGeneral Duty Individual or Overall Shields |
|
380-007Single Cone RingMedium Duty MIL-C-85049/17,/19,/36 Overall Shield |
Crimp Ring and Banding Terminations
440-032Medium Duty M85049/26 Overall Shield |
|
319-001Medium DutyOverall Shield |
|
440-030Medium DutyM85049/82 - M85049/90 Overall Shield |
Special Application
311-001General DutyOverall Shield |
|
460-001General DutyOverall Shield |
|
470-005General DutyIndividual and Overall Shield |
|
400-001Light DutyIndividual Shield |
Basic Backshell Configurations
Strain Relief Clamps Used on Backshells
MIL-C-85049/41 MS3057A Clamp |
Proprietary Light-Weight Clamp |
||
MIL-C-85049/42 MS3057D Clamp |
Proprietary G61911 Clamp |
Proprietary Cable Grip |
Strain Relief Clamps Used on Connectors
MS3417, MS27506, M83723/15S, M85049/38, /49, /52 | MS3418, MS27507, M83723/15R, M85049/39, /47, /51 | ||
M85049/53, /56 Cable Tie Backshell |
M85049/55, /63 Cable Tie |