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:
EMI Backshells
Series 38
Series 38 EMI backshells protect electrical wiring harnesses from electromagnetic interference. For use with shielded cable. Non-environmental. Heavy duty Type H saddle clamp has telescoping screws and die cast saddles. Two grounding rings provide low resistance termination of braided overall and individual shields.
Banding Backshells
Series 44
Series 44 Banding Backshells provide fast, reliable termination of cable braid shields to standard mil spec circular electrical connectors, Glenair Series 80 Mighty Mouse, Series 233 SuperNine, Series 806 Mil-Aero and Series 970 PowerTrip connectors.
Series 44 backshells are available in nine styles including shrink boot versions and shrouded "Band-in-a-Can" versions with saddle clamps for wire strain relief. Material choices include aluminum alloy, stainless steel and corrosion-proof composite.
Shrink Boot Adapters
For AS50151 Crimp, M26482 Series II, M83723 Series III, AS81703 Series 3, AS95234
Series 31
Lightweight Series 31 Shrink Boot Adapters fit standard mil-spec circular electrical connectors. Adapter has groove for lipped style heatshrink boots. Braid Trap Adapters have an EMI nut for terminating cable braid to connector.
Labor-saving Piggyback Boot Adapters have pre-installed boots for fast, easy installation. For shielded cables, a drop-in adapter attaches to cable braid with Band-Master banding strap.
Braid Sock Adapters have a length of shield braid attached to adapter.
TAG® Ring Backshells
Series 40
Series 40 TAG Ring® Backshells have multiple slots for terminating individual shields. Feed shield pigtails into slots in TAG Ring®, then thread nut or clamp onto slot legs to securely captivate braid. A gold-plated ground spring and PTFE friction washer provide consistent, low impedance grounding over a range of braid thicknesses. No special tools are needed for assembly.