For basic engineering drawings, the types the lines recommended by the bureau of Indian Standards presented in table 2 must be used. The thickness of the lines must be liked according to the kind and dimension of the illustration from any of the six groups provided in Table 1.In the instance where other varieties thickness of currently are offered for one-of-a-kind cases, for example, electrical and piping drawings, or if the lines mentioned in table 2 are used for applications other than those thorough in the last column, the conventions adopted must be described by notes on the drawing concerned.

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Table 1: Thickness of present (All size in mm)


Following room the different types the lines offered in engineering drawing:A kind – Continuos ThickB type – constant THINC type – constant THIN FreehandD type – constant THIN Zig-ZagE kind – Dashes THICKF kind – Dashes THING type – Chain ThinH type – Chain THIN and also THICKJ kind – Chain THICKK form – Chain THIN twin DashRead also: size and species of Dimensioning SystemsTable 2: Thickness of Lines

Type A

Outline the PartsOutline of Parts form lines represent the visible edges of the objects, hence should be outstanding in appearance and also therefore, are drawn as bolder i.e., thick constant lines.

Type B

Dimension, Projection, Leader, flower LinesDimension, Projection, Leader, Hatching form lines must be attracted thin and continuous. The expansion lines for dimensioning need to run indigenous the outlines without leaving a gap and also extend past the measurement lines. This kind is additionally used to draw outlines of surrounding and revolved sections.

Type C

Limits or boundaries of Partial or Interrupted ViewsLimits or borders of Partial or Interrupted Views form lines are attracted as continuous, thin, wavy, freehand lines come represent boundaries or borders of partial or interrupted views.

Type D

Break LinesBreak Lines type lines space ruled, short, zig-zag thin lines attracted to stand for the breaks.

Type E

Hidden inside wall (Thick)Hidden inside wall (Thick) form lines covers thick quick dashes, closely and also evenly spaced. These lines are drawn to represent hidden or invisible edge of the objects.

Type F

Hidden currently (Thin)Hidden lines (Thin) form lines consists thin short dashes, closely and also evenly spaced. These lines are drawn to represent hidden or invisible edge of the objects. Although thick lines the Type-E space recommended for representing the concealed edges, thin lines the Type-F are preferred.

Type G

Centre lines, present of Symmetry, Trajectories, and Pitch CirclesCentre lines, currently of Symmetry, Trajectories, and Pitch Circles kind of lines room long, thin, chain lines with alternately long and short dashes of proportion varying from 6:1 come 4:1 and also evenly spaced. The proportion when selected have to be kept throughout the drawing. The center lines are prolonged by a short distance beyond the outline. This lines are additionally drawn to stand for the currently of symmetry, trajectories, pitch circles. Etc,

Type H

Cutting airplane LinesCutting plane Lines are long lines, thickened ar ends and thin elsewhere, through alternately long and also short dashes of proportion varying from 4:1 come 6:1 and also evenly spaced. The corners where the section aircraft charges the direction are made thick because that a short length.

Type J

Lines to indicate Surfaces which require additional TreatmentThese are lengthy thick present with additionally long and also short dashes of proportion ranging from 6:1 to 4:1 and also evenly spaced. This lines are attracted to show surfaces, come receive extr treatment choose anodizing, plating, etc.

Type K

Lines to suggest Outlines of surrounding parts, too much positions the Movable Parts, Centroidal lines, parts situated in former of the cutting Planes, initial outlines prior to forming.These space thin lines through a long and also two quick dashes alternately and also evenly put in the proportion varying from 6:1 to 4:1. This lines are offered to stand for the outlines of surrounding parts, excessive positions that movable parts in the assembly drawings, components situated in former of the cutting planes, early stage outlines before forming, centroidal lines etc.

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Saif M. Is a mechanical Engineer by profession. He completed his engineering studies in 2014 and also is right now working in a big firm together Mechanical Engineer. That is additionally an author and also editor in ~