(1)零件的几何精度包括尺寸、形状和表面相互位置精度。经常检验的是尺寸、圆柱度、圆度、平面度、直线度、同轴度、平行度、垂直度、跳动等项目。根据维修特点，有时不是追求单个零件的几何尺寸，而是要求相对配合精度。
(1) The geometric accuracy of parts includes the mutual position accuracy of size, shape and surface. Frequently inspected items include dimension, cylindricity, roundness, flatness, straightness, coaxiality, parallelism, perpendicularity, runout, etc. According to the maintenance characteristics, sometimes it is not the geometric dimension of a single part, but the relative matching accuracy is required.
(2)零件的表面质量包括表面粗糙度，表面有无擦伤、腐蚀、裂纹、剥落、烧损、拉毛等缺陷。
(2) The surface quality of parts includes surface roughness and whether the surface has defects such as scratch, corrosion, crack, peeling, burning and galling.
(3)零件的物理力学性能 除硬度、硬化层深度外，对零件制造和修复过程中形成的性能，如应力状态、平衡状况、弹性、刚度、振动等也需根据‘情况适当进行检测。
(3) In addition to the hardness and the depth of hardened layer, the physical and mechanical properties of parts, such as stress state, balance state, elasticity, stiffness and vibration, also need to be properly tested according to the actual situation.

(4)零件的隐蔽缺陷 包括制造过程中的内部夹渣、气孔、疏松、空洞、焊缝等缺陷，还有使用过程中产生的微观裂纹。
(4) The hidden defects of parts include internal slag inclusion, porosity, porosity, cavity, weld and other defects in the manufacturing process, as well as micro cracks in the use process.
(5)零部件的质量和静动平衡 如活塞、连杆组之间的质量差，曲轴、风扇、轴、车轮等高速转动的零部件的静动平衡。
(5) The quality and static and dynamic balance of parts, such as the quality difference between piston and connecting rod group, and the static and dynamic balance of crankshaft, fan, shaft, wheel and other high-speed rotating parts.
(6)零件的材料性质如零件合金成分、渗碳层台碳量、各部分材料的均匀性、中石墨的拆出、橡胶材料的老化变质程度等。
(6) Material properties of parts, such as alloy composition of parts, carbon content of carburizing platform, uniformity of materials of various parts, removal of medium graphite, aging and deterioration degree of rubber materials, etc.
(7)零件表层材料与基体的结合强度 如电镀层、喷涂层、堆焊层和基体金属的结合强度，机械固定联结件的联结强度，轴承合金和轴承座的结合强度等。
(7) The bonding strength between the surface material of the part and the matrix, such as the bonding strength between the electroplated coating, spraying layer, surfacing layer and the matrix metal, the bonding strength of the mechanical fixed connector, the bonding strength between the bearing alloy and the bearing seat, etc.
(8)组件的配合情况 如组件的同轴度、平行度、啮合情况与配合的严密性等。
(8) Cooperation of components, such as coaxiality, parallelism, meshing and tightness of cooperation.
(9)铝合金门窗设备零件的磨损程度 正确判断摩擦磨损零件的磨损程度，由磨损极限确定其是否能继续使用。
(9) Wear degree of aluminum alloy door and window equipment parts correctly judge the wear degree of friction and wear parts, and determine whether they can continue to be used according to the wear limit.
(10)密封性 如内燃机缸体、缸盖需进行密封试验，检查有无泄漏。
(10) Sealing performance, such as the cylinder block and cylinder head of internal combustion engine, shall be subject to sealing test to check whether there is leakage.
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