CIRCULAR
BACKSHELLS
EXTENSIVE RANGE OF TERMINATION
OPTIONS FOR CIRCULAR CONNECTORS
High performance sealing and strain relief
backshell solutions
AEROSPACE, DEFENSE & MARINE
/// CIRCULAR BACKSHELLS
CIRCULAR BACKSHELLS
Contents
Introduction..................................................................................................................................... 3
Selecting a Backshell.................................................................................................................... 4
Termination Styles........................................................................................................................... 5
Material & Plating Codes.............................................................................................................. 6
Modification Codes........................................................................................................................ 7
Connector Interface Table........................................................................................................... 9
POLAMCO Backshell Part Numbering System.................................................................... 10
Calculating Wire Bundle Diameter........................................................................................... 11
Product Finder.................................................................................................................................. 12
BAND
BT Series............................................................................................................................................ 14
88 Series............................................................................................................................................. 16
AP Series............................................................................................................................................ 18
DS Series...........................................................................................................
...........................
20
SPRING
91 Series............................................................................................................................................. 22
BRAID TAIL
70 Series............................................................................................................................................ 24
BRAID TRAP
95 Series.............................................................................................................................................26
CONE
64 Series.............................................................................................................................................28
308 Series...........................................................................................................................................
30
STRAIN RELIEF
77 Series............................................................................................................................................. 32
MESH TAPE
KMA Series..........................................................................................................................................
34
KMCC Series......................................................................................................................................36
HEAT SHRINK BOOT
76 Series............................................................................................................................................. 38
THREAD EXTENDERS & ADAPTERS
PG Series............................................................................................................................................
40
DC Series.............................................................................................................................................
42
TINEL RING
TXR Series...........................................................................................................................................
44
HEXASHIELD
HexaShield Series............................................................................................................................46
COBRAHEAD
Backshell modification.....................................................................................................................
48
BAND STRAPS
Backshell accessory..........................................................................................................................
50
Glossary of Terms..............................................................................................................................
53
AEROSPACE, DEFENSE & MARINE
/// CIRCULAR BACKSHELLS
PAGE 2
CIRCULAR BACKSHELLS
Termination Options For Circular Connectors
For high-performance sealing and strain
relief, the ideal mate for a TE Connectivity
(TE) connector or molded part in a wiring
application, is a TE backshell.
TE supplies a comprehensive range of circular POLAMCO
and Raychem backshells that can assist in providing
effective strain relief, environmental sealing and
electromagnetic interference (EMI)/radio frequency
interference (RFI) shielding, helping you meet today’s
challenges in demanding environments, across many market
sectors.
Spin-Coupling Adapters
MULTIPLE CONFIGURATIONS
• Low profile options
• Compatible with many shell sizes
and plating finishes
• Wide variety of modification
options allow customisation of
standard ranges to suit specific
requirements
Spin-coupling adapters are two-part components that have
a rotatable coupling nut and a grooved body designed to
accommodate lipped-type heat-shrinkable boots.
Spin-couplings with a compatible molded part are used
to optimize environmental protection and strain relief of
unscreened cable terminations. Cable repairs can often be
made without removing the boot.
Backshell
EASY INSTALLATION
• Tool free ranges available
• Simple and fast termination
solutions
• Two-part components allow
uncoupling for repairs to help
eliminate damage to the boot
Heat-shrinkable molded
boot (if used)
HIGH-RELIABILITY
SOLUTIONS
• Backshells can provide strain-
relief and cable support to help
prevent bending or overflexing
• Offer individual or overall 360°
screening against EMI/RFI
interference
• Backshells can offer protection
towards the effectiveness of the
cable, sealing against water and
dirt ingress
Connector
Rollback Repair Possible With A Backshell
Many cable repairs are made within 75 mm of the
connectors—usually because of a broken pin or wire. By
reheating the heat-shrinkable boot and unscrewing the
backshell coupling nut, the boot can be “rolled back,”
providing access to the rear of the connector for repair. This
technique is applicable to spin-coupling backshells utilizing
a heatshrink boot.
CIRCULAR BACKSHELLS
Selecting A Backshell
TE offers an extensive standard
range of backshell styles to suit a
wide variety of applications and
requirements. These ranges can be
extensively customized using an
array of plating options, materials
and modification codes. Use the
product finder on pages 12-13 to
select the most suitable standard
series for your requirement.
Adapter Code
An alphabetical code is used to identify connectors
with similar adapter interfaces. This code is used to
determine the backshell family and part number. The
table connector interface table on page 9 shows the
appropriate code to match a variety of interfaces.
Backshell Part Number
The part number is the sequence of numbers and
letters that describes the adapter family (or series),
size, angle, material, finish, and modifications. The
part numbering system is explained on page 10 for
POLAMCO series backshells and on the individual
Raychem product pages.
Family/Series
TE offers several families (or series) of backshell
products. Each part number begins with an numerical
or alphanumeric prefix denoting the specific product
family.
connectors are obtainable in either larger or
smaller sizes and some use letter codes.
Entry Size
Entry size is the diameter of the hole through which
the cable enters into the adapter. If unknown, the
diameter required can be calculated using the formula
shown on page 11.
Modifications
Other options (such as extended length, part
marking etc) are available and are defined by
standard modification codes - listed on pages
7-8. Alongside the standard ranges shown in this
brochure, TE also offer custom solutions to fit
more exact requirements. Contact the sales office
to find out more.
Shell Size
This is the size of a connector as specified by the
connector manufacturer. It is normally a two-digit
number between 08 and 24, although certain
Please refer to the fold out interface page (attached to the reverse cover of this brochure)
for interface specific measurements.
AEROSPACE, DEFENSE & MARINE
/// CIRCULAR BACKSHELLS
PAGE 4
CIRCULAR BACKSHELLS
Termination Styles
There are a variety of methods for terminating screening braid to backshells,
many of which are covered within TE’s standard range of backshells shown
below.
Tinel Ring
Cone
Memory ring shrunk by the application
of heat
Used on: TXR
Braid/Pigtails clamped between cones
Used on: 64/308/HexaShield Series
Band
Mesh Tape
Band clamped with calibrated tool
Used on: BT/88/AP/DS Series
Wraps mesh tape wraps around individual
screens to eliminate EMC windows
Used on: KMA Series
Braid Tail
Pre-Fabricated
Product supplied with pre-terminated braid
tail
Used on: 70 Series
Backshell with pre-installed braid tail and
heatshrink boot. Installed on cable with
heat gun.
Used on: KTKK/TAK
Spring
Braid Trap
Spring wrapped around braid
(without tooling)
Used on: 91 Series
Braid trapped in loose fitting thread
Used on: 95/77 Series
AEROSPACE, DEFENSE & MARINE
/// CIRCULAR BACKSHELLS
PAGE 5
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