# SOLIDWORKS Sketch Relations Summary

Article by Adam Bridgman, CSWE updated January 14, 2014

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The SOLIDWORKS Online Help provides a summary of all of the SOLIDWORKS sketch relations available.

There is something missing from this table, it should show the icons associated with each relation.  These are the symbols you see when you select the entities described under entities to select.

So I have copied the table from the link and added the missing images for your reference.

RelationEntities to selectResulting relations
Horizontal One or more lines or two or more points.The lines become horizontal or vertical (as defined by the current sketch space). Points are aligned horizontally or vertically.
VerticalOne or more lines or two or more points.The lines become horizontal or vertical (as defined by the current sketch space). Points are aligned horizontally or vertically.
CollinearTwo or more lines.The items lie on the same infinite line.
PerpendicularTwo lines.The two items are perpendicular to each other.
ParallelTwo or more lines.A line and a plane (or a planar face) in a 3D sketch.The items are parallel to each other.The line is parallel to the selected plane.
ParallelYZA line and a plane (or a planar face) in a 3D sketch.The line is parallel to the YZ plane with respect to the selected plane.
ParallelZXA line and a plane (or a planar face) in a 3D sketch.The line is parallel to the ZX plane with respect to the selected plane.
AlongZA line and a plane (or a planar face) in a 3D sketch.The line is normal to the face of the selected plane.
Relations to the global axes are called AlongX, AlongY, and AlongZ. Relations that are local to a plane are called Horizontal, Vertical, and Normal.
TangentAn arc, ellipse, or spline, and a line or arc.The two items remain tangent.
ConcentricTwo or more arcs, or a point and an arc.The arcs share the same centerpoint.
MidpointTwo lines or a point and a line.The point remains at the midpoint of the line.
IntersectionTwo lines and one point.The point remains at the intersection of the lines.
CoincidentA point and a line, arc, or ellipse.The point lies on the line, arc, or ellipse.
EqualTwo or more lines or two or more arcs.The line lengths or radii remain equal.
Equal CurvatureTwo splines.The radius of curvature and the vector (direction) matches between the two splines.
SymmetricA centerline and two points, lines, arcs, or ellipses.The items remain equidistant from the centerline, on a line perpendicular to the centerline.
FixAny entity.The entity’s size and location are fixed. However, the end points of a fixed line are free to move along the infinite line that underlies it. Also, the endpoints of an arc or elliptical segment are free to move along the underlying full circle or ellipse.
Fix SlotA slot sketch entity.The entity’s size and location are fixed.
PierceA sketch point and an axis, edge, line, or spline.The sketch point is coincident to where the axis, edge, or curve pierces the sketch plane. The pierce relation is used in sweeps with guide curves.
Merge PointsTwo sketch points or endpoints.The two points are merged into a single point.
Doubled DistanceA centerline and any sketch entity.The sketch entity is dimensioned at twice the distance from the centerline.
Equal SlotsTwo or more slot sketch entities.The items have equal lengths and radii.
On EdgeEdges of a solid.The edges of the solid are projected to the sketch plane using the Convert Entities  tool.
On PlaneSketch entities on a plane.The sketch entities reside on the plane.
On SurfaceSketch entities on a surface.The sketch entities reside on the surface.
Tangent to FaceA sketch entity and a solid face.The sketch entity and face are made tangent to one another.
TractionSee Using Traction and Belts for Layout Sketches.