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Drafting lines revised in 2010 (excerpt from JIS B 0001:2010)

Types and uses of lines

Name by use	Line type ^c)	Line use
Outline	Thick solid line	Used to describe the shape of a visible part of the object.
Dimension line	Thin solid line	Used for dimensioning.
Projection line		Used to project from a figure to note dimensions.
Lead line (including reference lines)		Used to indicate descriptions, symbols, etc.
Rotating section line		Used to represent a perspective of a part in the figure, rotated by 90°.
Centerline		Used to represent a simplified centerline in a figure.
Water level line ^a)		Used to indicate the position of a water, liquid, or other surface.
Hidden outline	Thin or thick dashed line	Used to describe the shape of an invisible part of the object.
*Perforation line	Dashed spaced line	Used to indicate the seam of cloth, leather, or sheet material.
*Association line	Dotted line	Used to indicate the internal linkage of control equipment, interlocking operation of switchgear, etc.
Centerline	Thin long-dashed short-dashed line	a) Used to represent the center of a figure.
Centerline		b) Used to represent the central locus along which the center moves.
Reference line		Used to clearly indicate the basis of the location decision.
Pitch line		Used to represent the standard taking the pitch of a repeating figure.
Special requirement line	Thick long-dashed short-dashed line	Used to indicate the extent to which special requirements should be applied, such as parts subjected to special processing.
Fictitious line ^b)	Thin long dashed double-dotted line	a) Used to represent adjacent areas for reference.
		b) Used to indicate the position of tools, jigs, etc., for reference.
		c) Used to represent a movable part at a specific position during movement or at the limit of movement.
		d) Used to represent the shape before or after processing.
		e) Used to indicate repetition.
		f) Used to represent an area in front of an illustrated cross section.
Center of gravity line		Used to represent a line connecting the centers of gravity of a section.
*Optical axis line		Used to represent a line that shows the optical axis passing through a lens.
*Pipelines, wiring enclosure lines	Dashed dotted line	Used to represent piping routes for water, oil, steam, water/sewage systems, etc.
	Dashed double-dotted line
	Dashed triple-dotted line
	Long dashed dotted line	Used to indicate certain functions by enclosing them in lines to distinguish between water, oil, steam, power supply sections, amplification sections, etc.
	Long dashed double-dotted line
	Long dashed triplicate-dotted line
	Double-dashed dotted line
	Double-dashed double-dotted line	Used to represent piping routes for water, oil, steam, etc.
	Double-dashed triple-dotted line	Used to represent piping routes for water, oil, steam, etc.
Break line	Thin solid or zig-zag lines with an irregular waveform	Used to represent a boundary that has been partially breached or partially removed from an object.
Section line	Thin long-dashed short-dashed line with ends and directional changes thickened. ^d)	Used to represent the cross-sectional position on the corresponding figure when drawing a cross-sectional view.
Hatching	Thin solid lines, arranged in a regular pattern	Used to distinguish a limited specific part of a figure from other parts. For example, a cross-sectional perspective is shown.
Special purpose lines	Thin solid line	a) Used to represent extensions of outlines and hidden outlines.
		b) Used to indicate a flat plane with two X-shaped lines.
		c) Used to clarify or describe a location.
	Extra thick solid line	Used to illustrate a solid wire of thin-walled sections of rolled steel plate, glass, etc.

Notes

^a) Not specified in JIS Z 8316.
^b) Fictitious lines are used to indicate shapes that do not appear in the figure on a projection but are necessary for convenience.
Also used to show additional figures as aids in understanding functional and processing aspects. (e.g., intermittent relationships by relay)
^c) Other types of line should be according to JIS Z 8312 or JIS Z 8321.
^d) There is no need to use thick lines at the ends and for direction changes if there is no risk of mixing with other applications.
*: Name of newly added use