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A front rail is formed by bending a steel sheet. The front rail has a front part having a hole, the hole allowing insertion of a dowel pin arranged on a printed circuit board, a top part mounting a guide rail for guiding the printed circuit board thereon, a rear part extending from the top part via

A front rail is formed by bending a steel sheet. The front rail has a front part having a hole, the hole allowing insertion of a dowel pin arranged on a printed circuit board, a top part mounting a guide rail for guiding the printed circuit board thereon, a rear part extending from the top part via a hem formed by folding back the steel sheet, for supporting a lower portion of the top part, and a bottom part extending from the rear part.

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1. A front rail configured to be formed by bending a piece of a plate for a sub rack, the front rail comprising:a front part defining a plurality of holes configured to receive pins arranged on plug-in units;a top part;a rear part configured to support the top part;a bottom part;a first hem extendin

1. A front rail configured to be formed by bending a piece of a plate for a sub rack, the front rail comprising:a front part defining a plurality of holes configured to receive pins arranged on plug-in units;a top part;a rear part configured to support the top part;a bottom part;a first hem extending from the top part, the first hem defining a plurality of projections configured to receive rails to guide the plug-in units; anda second hem extending from the bottom part, the second hem defining a plurality of voids configured to receive handles of the plug-in units,wherein the front part, the top part, the rear part, and the bottom part define a partially closed volume having a rectangular cross section, the first hem extends from the volume in a first direction, and the second hem extends from the volume in a second direction opposite the first direction. 2. The front rail according to claim 1, wherein the second hem is disposed adjacent the front part. 3. The front rail according to claim 2, wherein the plurality of voids defined by the second hem extends through the second hem. 4. The front rail according to claim 2, further comprising:a mounting part defining a screw hole, the mounting part formed by bending a cantilever part in a lateral direction, wherein the cantilever part is integrated with the bottom part. 5. The front rail according to claim 1, wherein the first hem includes a first layer, a second layer, and a fold disposed between the first layer and the second layer. 6. The front rail according to claim 1, wherein the bottom part extends from the rear part towards the front part. 7. The front rail according to claim 1, wherein the bottom part is parallel to and spaced a distance apart from the top part and the rear part is parallel to and spaced a distance apart from the front part. 8. A front rail configured to be disposed at a front edge portion of a sub-rack, the front rail comprising:a front part, a top part, a rear part, a bottom part, a first hem extending from the top part, the first hem defining a plurality of projections configured to receive rails to guide plug-in units including circuit boards, and a second hem extending from the bottom part, all of which are formed by bending a piece of a plate, the front part, the top part, the rear part, and the bottom part defining a partially closed volume having a rectangular shape, the first hem extending from the closed volume in a first direction, the second hem extending from the closed volume in a second direction opposite to the first direction, wherein:the first and second hems are formed by folding the plate; andthe front part defines a plurality of holes configured to receive pins arranged on the plug-in units. 9. The front rail according to claim 8, wherein the front part contacts the bottom part through one of the hems. 10. The front rail according to claim 9, further comprising:a plurality of engagement holes arranged on at least one of the hems extending from both the front and bottom parts. 11. The front rail according to claim 9, further comprising:a mounting part defining a screw hole, the mounting part formed by bending a cantilever part in a lateral direction, wherein the cantilever part is integrated with the bottom part.