Bulk Data Entry Defines a scalar mass element without reference to a property entry.


(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)


(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
CMASS2 2 1.1 56 3


Field Contents SI Unit Example
EID Unique element identification number.

No default (Integer > 0)

M Value of the scalar mass.

No default (Real)

G1, G2 Geometric grid or identification number.

No default (Integer ≥ 0)

C1, C2 Component number in the displacement coordinate system specified by the CD entry of the GRID data.

No default (0 ≤ Integer ≤ 6)


  1. Zero or blank may be used to indicate a grounded terminal G1 or G2 with a corresponding blank or zero C1 or C2. A grounded terminal is a point whose displacement is constrained to zero.
  2. Scalar points may be used for G1 and/or G2, (with a corresponding C1 and/or C2 of zero or blank). If only scalar points and/or grounded terminals are involved, it is more efficient to use the CMASS4 entry.
  3. This single entry completely defines the element since no material or geometric properties are required.
  4. The two connection points (G1, C1) and (G2, C2) must be distinct. Except in unusual circumstances, one of them will be a grounded terminal with blank entries for Gi and Ci.
  5. When the SPSYNTAX setting on the SYSSETTING I/O Options Entry is set to CHECK (default) or STRICT, it is required for grid/component pairs (G#/C#) that the component be 0 or blank when the grid reference is a scalar point (SPOINT), and that the component be > 1 when the grid reference is a structural grid point (GRID). When SPSYNTAX is set to MIXED, it is allowed for grid/component pairs (G#/C#) that the grid reference be either a scalar point (SPOINT) or a structural grid point (GRID) when the component is 0, 1 or blank; interpreting all of these as 0 for scalar points and as 1 for structural grids. When the component is greater than 1, the grid reference must always be a structural grid (GRID).
  6. Scalar mass elements are ignored in heat transfer analysis.
  7. This card is represented as a spring or mass element in HyperMesh.