TM 9-243TYPES AND USESSPRING TUBE BENDERSThere are two types of spring tube benders, externaland internal. The spring tube bender permits the bend-ing of small diameter tubing by hand without collapsingthe tubing.External benders are used to bend straight sections oftubing which have at least one end which has not beenflared. They are available in 1/4, 5/16, 3/8, 7/16, 1/2, and5/8-inch diameters.Internal benders are used for bending straight sectionsof tubing which have both ends flared. They are availa-ble in 3/8, 1/2, and 5/8-inch outside diameters.HAND TUBE BENDERThe hand tube bender consists of the following compo-nents: a handle (1) a radius block (mandrel) (2), aclip (3) and a slide bar (4). The radius block isgraduated from 0 to 180 degrees, and the slide bar has ascribe mark which indicates the degree of bend. Thesebenders are available in 3/16, 1/4, 5/16, 3/8, and1/2-inch sizes. The hand tube bender is used to bendcopper, brass, or aluminum tubing to specific angles.ELECTRICAL CONDUIT HAND BENDERThe electrical conduit hand bender has precise groovesto insure a smooth bend. It has a concave base (1), afoot rest (2) and a retaining hook (3) to keep conduitfrom slipping as it is being bent. The bender has athreaded opening for attaching a threaded piece of pipeto be used as a handle. Electrical conduit hand bendersare available in 1/2, 3/4, 1, 1-1/4, 1-1/2, and 2 inches indiameter. They are used to bend thin wall and rigidconduit to allow for flat installation on inside buildingwalls.40-2
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