| Straightness - a condition where an element of a surface or an axis is a straight line. —直度：一个条件，一个面元素或轴是一条直线 | ||
| Flatness - is the condition of a surface having all elements in one plane. —平整度:是条件，表面有所有的元素在一个平面 | ||
| Roundness - describes the condition on a surface of revolution (cylinder, cone, sphere) where all points of the surface intersected by any plane. —圆度:描述条件对的表面(圆柱,圆锥,球)在所有点的表面相交的任何飞机 | ||
| Cylindricity - describes a condition of a surface of revolution in which all points of a surface are equidistant from a common axis. —圆柱度:描述了一个条件的旋转面,使所有的点面距离相等,一个共同的旋转轴 | ||
| Profile of a Line - is the condition permitting a uniform amount of profile variation, ether unilaterally or bilaterally, along a line element of a feature. | ||
| —线轮廓度:是条件允许量相同的剖面变化,醚单边或双边,沿着一条线元素的特征 | ||
| Profile of a Surface - is the condition permitting a uniform amount of profile variation, ether unilaterally or bilaterally, on a surface. —面轮廓度：是条件允许量相同的剖面变化，醚单边或双边，上表面 | ||
| All Around Symbol - indicating that a tolerance applies to surfaces all around the part. —周围标志:表明公差适用于所有周围的部分表面 | ||
| Angularity - is the condition of a surface, axis, or centerplane, which is at a specified angle from a datum plane or axis. —倾斜度:是表面，轴，或中线，这是从某一特定角度基准平面或轴 | ||
| Perpendicularity - is the condition of a surface, axis, or line, which is 90 deg. From a datum plane or a datum axis. —垂直度:条件是表面，轴，或线，这是90度的基准平面或基准轴 | ||
| Parallelism - is the condition of a surface, line, or axis, which is equidistant at all points from a datum plane or axis. —平行度:一个表面，线，或轴，这是等距离的所有点，基准平面或轴 | ||
| Position Tolerance - defines a zone within which the axis or center plane of a feature is permitted to vary from true (theoretically exact) position. | ||
| —位置公差:定义一个区域内的轴或中心平面的一个特点是允许不同的真正的(理论上精确)位置 | ||
| Concentricity - describes a condition in which two or more features , in any combination, have a common axis. —同心度:描述在其中一个条件的2个或更多的功能，在任何组合，有一个共同的旋转轴 | ||
| Symmetry - is a condition in which a feature (or features) is symmetrically disposed about the center plane of a datum feature. —对称度:是一种状况，其中一个功能（或功能）是处理有关对称中心平面基准特征 | ||
| Runout - is the composite deviation from the desired form of a part surface of revolution through on full rotation (360 deg) of the part on a datum axis. | ||
| —跳动:是复合偏离理想形式的一部分表面上通过旋转（360度）的一部分，在基准轴 | ||
| Total Runout - is the simultaneous composite control of all elements of a surface at all circular and profile measuring positions as the part is rotated through 360. —全跳动:是同时复合控制所有表面元素在所有圆轮廓测量位置的部分是通过旋转360 | ||
| Maximum Material Condition (MMC) - is that condition of a part feature wherein it contains the maximum amount of material within the stated limits of size. That is: minimum hole size and maximum shaft size. —最大材料状态:是条件的一部分功能其中包含的最高金额材料在规定的极限尺寸。那就是：最小孔尺寸和最大轴尺寸 | ||
| Least Material Condition (LMC) - implies that condition of a part feature of size wherein it contains the least (minimum) amount of material, examples, largest hole size and smallest shaft size. It is opposite to maximum material condition. | ||
| —最小材料状态:意味着条件的一部分功能的大小，其中也包含了最小（最低）的材料，例子，最大孔尺寸和最小轴径。它的对面是最大材料状态。 | ||
| Regardless Of Feature Size (RFS) - the condition where the tolerance of form, runout or location must be met irrespective of where the feature lies within its size tolerance. —不论大小的特征:不论大小的特征的情况下，形状公差，跳动或位置必须满足，不论在哪里，它的特点是在其尺寸公差 | ||
| Projected Tolerance Zone - applies to a hole in which a pin, stud, screw, etc., is to be inserted. It controls the perpendicularity of the hole to the extent of the projection from the hole and as it relates to the mating part clearance. The projected tolerance zone extends above the surface of the part to the functional length of the pin, stud, and screw relative to its assembly with the mating part. | ||
| —投影公差区 | ||
| Tangent Plane - indicating a tangent plane is shown. The symbol is placed in the feature control frame following the stated tolerance. —切平面 | ||
| Free State Variations - is a term used to describe distortion of a part after removal of forces applied during manufacture. —自由状态的变化 | ||
| Diameter - indicates a circular feature when used on the field of a drawing or indicates that the tolerance is diametrical when used in a feature control frame. —直径 | ||
| Basic Dimension - used to describe the exact size, profile, orientation or location of a feature. A basic dimension is always associated with a feature control frame or datum target. (Theoretically exact dimension in ISO) | ||
| —基本尺寸 | ||
| Reference Dimension - a dimension usually without tolerance, used for information purposes only. It does not govern production or inspection operations. (Auxiliary dimension in ISO) —参考尺寸 | ||
| Datum Feature - is the actual component feature used to establish a datum. —基准特征 | ||
| Dimension Origin - Signifies that the dimension originates from the plane established by the shorter surface and dimensional limits apply to the other surface. —尺寸原 | ||
—特征控制框 | Feature Control Frame - is a rectangular box containing the geometric characteristics symbol, and the form, runout or location tolerance. If necessary, datum references and modifiers applicable to the feature or the datums are also contained in the box. | |
| Conical Taper - is used to indicate taper for conical tapers. This symbol is always shown with the vertical leg to the left. —圆锥锥度 | ||
| Slope - is used to indicate slope for flat tapers. This symbol is always shown with the vertical leg to the left. —斜坡度 | ||
| Counterbore/Spotface - is used to indicate a counterbore or a spotface. The symbol precedes the dimension of the counterbore or spotface, with no space | ||
| —沉孔或锪平 | ||
| Countersink - is used to indicate a countersink. The symbol precedes the dimensions of the countersink with no space. —埋头孔 | ||
| Depth/Deep - is used to indicate that a dimension applies to the depth of a feature. This symbol precedes the depth value with no space in between. | ||
| —深度 | ||
| Square - is used to indicate that a single dimension applies to a square shape. The symbol precedes the dimension with no space between. —正方形 | ||
| Number of Places - the X is used along with a value to indicate the number of times a dimension or feature is repeated on the drawing. —相同的地方 | ||
| Arc Length - indicating that a dimension is an arc length measured on a curved outline. The symbol is placed above the dimension. —电弧长度 | ||
| Radius - creates a zone defined by two arcs (the minimum and maximum radii). The part surface must lie within this zone. —半径 | ||
之间 | Between - to indicate that a profile tolerance applies to several contiguous features, letters may designate where the profile tolerance begins and ends. These letters are referenced using the between symbol (since 1994) or the word between on drawings made to earlier versions of the Standard. | |
统计公差 | Statistical Tolerance - is the assigning of tolerances to related components of an assembly on the basis of sound statistics (such as the assembly tolerance is equal to the square root of the sum of the squares of the individual tolerances). By applying statistical tolerancing, tolerances of individual components may be increased or clearances between mating parts may be reduced. The increased tolerance or improved fit may reduce manufacturing cost or improve the product's performance, but shall only be employed where the appropriate statistical process control will be used. Therefore, consideration should be given to specifying the required Cp and /or Cpk or other process performance indices. | |
—基准公差 | Datum Target - is a specified point, line, or area on a part that is used to establish the Datum Reference Plane for manufacturing and inspection operations. | |
