零件的幾何精度包括尺寸、形狀和表面位置精度。經常檢查的項目有尺寸、圓柱度、圓度、平面度、直線度、同軸度、平行度、垂直度和跳動等。根據維修的特點，有時不要求單件的幾何尺寸，而要求相對配合精度。
The geometric accuracy of parts includes the accuracy of size, shape and surface position. The frequently checked items include dimension, cylindricity, roundness, flatness, straightness, coaxiality, parallelism, perpendicularity and runout. According to the characteristics of maintenance, sometimes the geometric dimension of a single piece is not required, but the relative matching accuracy is required.
零件的表面質量包括表面粗糙度，表面是否有劃痕、腐蝕、裂紋、脫落、燒焦、咬合等缺陷。
The surface quality of parts includes surface roughness and whether there are scratches, corrosion, cracks, falling off, scorching, bite and other defects on the surface.
除硬度、硬化層深度外，還應根據情況對零件在制造和修理過程中形成的應力狀態、平衡狀態、彈性、剛度、振動等物理機械性能進行適當檢測。
In addition to the hardness and the depth of hardened layer, the physical and mechanical properties such as stress state, equilibrium state, elasticity, stiffness and vibration formed during the manufacturing and repair of parts shall also be properly tested according to the situation.

零件的隱性缺陷包括制造過程中的內部夾渣、孔隙、氣孔、空隙、焊縫等缺陷，以及使用過程中產生的微觀裂紋。
The hidden defects of parts include internal slag inclusion, pores, pores, voids, welds and other defects in the manufacturing process, as well as micro cracks in the use process.
零件的質量和靜平衡，如活塞和連桿的質量差異，曲軸、風扇、軸、輪等高速旋轉的零件的靜平衡。
The mass and static balance of parts, such as the mass difference between piston and connecting rod, and the static balance of crankshaft, fan, shaft, wheel and other high-speed rotating parts.
零件的材料性能，如零件的合金成分、滲碳層的含碳量、各零件材料的均勻性、中石墨的去除情況、橡膠材料的老化變質程度等。
Material properties of parts, such as alloy composition of parts, carbon content of carburized layer, uniformity of materials of all parts, removal of graphite in, aging and deterioration degree of rubber materials, etc.
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