，通用零部件行业标准规范英汉对照，望及时完成
Introduction
General parts are integral components of any hardware or device, performing specific tasks and responsible for outcomes. As such, it is essential that general parts comply with standard industry regulations to ensure proper operation and safety. This document provides an English and Chinese parallel translation of common standards used in the general parts industry.
General Material Specifications
Small Parts: Generally, a small part is defined as any component less than 0.4 inches in size. For this section, small parts must be made of materials such as stainless steel, aluminum, brass, and carbon steel. All components must be corrosion-resistant and able to withstand environmental elements.
Medium Parts: Medium parts are components between 0.4 and 5.0 inches in size. This group should be constructed with metals such as stainless steel, aluminum, brass, and copper. All items must be able to resist wear and tear and exposure to moisture and other elements.
Large Parts: For large parts, defined as components larger than 5.0 inches, composite materials and plastics may be used in addition to metal construction. The items must be able to withstand pressure, vibration, and other elements.
General Tolerances
Small Parts: Small parts must adhere to a tolerance of ±0.010 inches unless otherwise specified.
Medium Parts: Medium parts must adhere to a tolerance of ±0.015 inches unless otherwise specified.
Large Parts: Large parts must adhere to a tolerance of ±0.020 inches unless otherwise specified.
Markings and Coding
Small Parts: Small parts must have all dimensions, numbers, letters, and symbols permanently marked on the surface of the component in a very legible format. Preferably, this should be done with a laser etching machine.
Medium Parts: Medium parts must have all dimensions, numbers, letters, and symbols clearly printed on the component using a durable ink.
Large Parts: Large parts must have all dimensions, numbers, letters, and symbols permanently etched into the component using a hieroglyphic or laser etching machine.
Surface Finishes
Small Parts: Small parts must have a surface finish of 2.5 to 2.6 μm unless otherwise specified.
Medium Parts: Medium parts must have a surface finish of 2.8 to 3.2 μm unless otherwise specified.
Large Parts: Large parts must have a surface finish of 3.2 to 3.8 μm unless otherwise specified.
Conclusion
The general parts industry must adhere to a series of regulations for component construction, tolerances, markings, and surface finishes to ensure that items have been manufactured with safety, longevity, and improved performance in mind. This document provides an English and Chinese parallel translation of common industry standards. With the correct implementation of the standards mentioned, manufacturers will be able to confidently produce parts of the highest quality.
