TM 9-243
TYPES AND USES
SPRING TUBE BENDERS
There are two types of spring tube benders, external
and internal. The spring tube bender permits the bend-
ing of small diameter tubing by hand without collapsing
the tubing.
External benders are used to bend straight sections of
tubing which have at least one end which has not been
flared. They are available in 1/4, 5/16, 3/8, 7/16, 1/2, and
5/8-inch diameters.
Internal benders are used for bending straight sections
of tubing which have both ends flared. They are availa-
ble in 3/8, 1/2, and 5/8-inch outside diameters.
HAND TUBE BENDER
The hand tube bender consists of the following compo-
nents: a handle (1) a radius block (mandrel) (2), a
clip (3) and a slide bar (4). The radius block is
graduated from 0 to 180 degrees, and the slide bar has a
scribe mark which indicates the degree of bend. These
benders are available in 3/16, 1/4, 5/16, 3/8, and
1/2-inch sizes. The hand tube bender is used to bend
copper, brass, or aluminum tubing to specific angles.
ELECTRICAL CONDUIT HAND BENDER
The electrical conduit hand bender has precise grooves
to insure a smooth bend. It has a concave base (1), a
foot rest (2) and a retaining hook (3) to keep conduit
from slipping as it is being bent. The bender has a
threaded opening for attaching a threaded piece of pipe
to be used as a handle. Electrical conduit hand benders
are available in 1/2, 3/4, 1, 1-1/4, 1-1/2, and 2 inches in
diameter. They are used to bend thin wall and rigid
conduit to allow for flat installation on inside building
walls.
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