1factory supports specs in the following formats:
- Nominal +Tol, -Tol (the +Tol and the -Tol do not need to be equal)
- Nominal +Tol +Tol
- Nominal -Tol -Tol
- Min, Max
- Min only
- Max only
- Nominal, Min, Max (a special case created for the food industry)
- Basic (i.e. Nominal only with no Tolerance)
- GD&T (with either only a +Tol or only a -Tol)
- Note
1factory recognizes and offers ANSI standard symbols for the following characteristics:
- Angularity:

- Circular-runout:

- Circularity:

- Concentricity:

- Counterbore:

- Countersink:

- Cylindricity:

- Depth:

- Diameter:
- Flatness:

- Line-profile:

- Linear-dimension:

- Parallelism:

- Perpendicularity:

- Position:

- Radius: R
- Surface Roughness:
- Symmetry:

- Straightness:

- Taper:
- Total Runout:

- Surface-profile:
In addition, 1factory offers custom symbols for display convenience [i.e these are not ANSI standard engineering symbols or abbreviations.]
- Angle:
- Chamfer
- Tap-depth
- Tap-diameter
- Thread
- Thread-depth: