Page 10 - Circular Connector Backshells and Accessories

How to Order
Circular Connector Backshells
How
to Order

Calculating Wire Bundle Diameter
A backshell's rear cable entry can accommodate only a narrow range of cable diameters. When selecting the backshell
cable entry size from the provided tables, it is a good idea to error on the side of too large, as an undersized cable can always
be enlarged with tape or a grommet to fit the cable clamp. Whan calculating wire bundle diameters, note that the gauge
# of the wire describes only the diameter of the metal conductor, and not the overall diameter including insulation and/or
braids. Refer to the appropriate wire specification for the actual diameter of the wire for use in the following calculations.

Steps Calculations
(1a) Determine average wire diameter when Given 30 Wires @ .045 DIA
all wires are the same diameter; or Avg. Wire DIA = .045

(1b) Determine average wire diameter when Given 15 Wires @ .045 and 15 Wires @ .135
15 x .045 = .68
wires are different diameters. 15 x .135 = 2.03 + 2.71 = .090 Avg. Wire DIA
= 2.71 30

(2) Multiply average wire diameter by factor (1a) .045 x 6.7 = .3015 Core Wire Bundle DIA
from Table I below (1b) .090 x 6.7 = .603 Core Wire Bundle DIA

(3) Add thickness of any shielding or jacketing (1a) .3015 + .025 = .3265 Wire Bundle Outside DIA
to core wire bundle diameter (for example,
add .025 for braided sleeving) (1b) .603 + .025 = .628 Wire Bundle Outside DIA

TABLE I
TABLE I
No. of Wires 1 2 3 4 5 6 7 8 9 10 12 14 16 18 20 24 28 32
Factor 1.0 2.0 2.2 2.4 2.7 2.9 3.0 3.3 3.8 4.0 4.3 4.6 5.0 5.3 5.6 6.0 6.5 6.9
No. of Wires 36 40 45 50 55 60 65 70 75 80 90 100 125 150 175 200 250 300
Factor 7.4 7.7 8.1 8.5 8.9 9.3 9.7 10.1 10.5 10.9 11.6 12.2 13.7 15.0 16.1 17.2 19.3 21.0

Backshell Part Number Development shell or some other type of connector accessory?

Glenair follows a standardized format for the de- Use the graphical product selection guide at the be-
velopment of accessory part numbers, so mastering ginning of the catalog for help in getting to the right
the process once will enable you to build valid part section.
numbers from any connector accessory product
family—circular, rectangular, composite, fiber op- 360 G S 003 NF 17 10 M 6
tic, and so on. Some differences are of course to
be found from one product series to the next be- Product Series Length - Straight Only
cause of the range of available options. If in doubt, Connector Designator (1/2 inch increments:
e.g. 6 = 3 inches)
QwikCreate, The Glenair Part Number Builder, is Angular Function Strain Relief Style
now available on our website and takes all the pain J = 90 o (H, A, M, F)
H = 45 o
and suffering out of backshell specification. For S = Straight Dash No. (Tables X, XI, XII)
catalog users, the following steps will serve as gen- Basic Part Number Shell Size (Table I)
eral guide to the process. Finish (Table II)
(1) Select the Product Series: Do you want a Typical backshell part number development or "How
dust cap, a banding adapter, an environmental back- to Order" tree

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www.glenair.com 8 E-Mail: sales@glenair.com