Gear Accuracy Grade Conversion Chart

The characteristics of gear accuracy standards vary among different countries worldwide. Here are some notable differences:

1. Accuracy Grade System: Different countries’ standards may utilize different accuracy grade systems to describe the precision requirements of gears. For example, ISO standards use a numerical grade system (e.g., grade numbers in ISO 1328-1), while AGMA standards employ a letter grade system (e.g., grade letters in AGMA 2000-A88).

2. Measurement Methods: Various standards may provide different measurement methods and specifications to assess gear accuracy. This includes variances in measurement tools, parameters, and testing procedures. Each standard may have its requirements and specifications for gear measurement.

3. Range of Accuracy Requirements: Standards from different countries may cover varying ranges of accuracy requirements. Some standards may offer more detailed grade divisions and specifications to accommodate broader application needs. For instance, specific standards may provide stricter grades and requirements for high-precision applications.

4. Gear Types: Different standards may have specific requirements and specifications for different gears, such as cylindrical gears, helical gears, bevel gears, and others. These requirements may be based on each gear type’s specific design and manufacturing characteristics.

5. Region-Specific Requirements: Some standards may include region-specific or industry-specific requirements. Particular regional environments, industry demands, or quality standards can influence these requirements. For example, certain standards may provide additional accuracy requirements tailored to specific industries like aerospace, automotive, etc.

It’s important to note that these are general observations, and specific standard characteristics may vary depending on the country, region, and industry. In practical applications, it is essential to reference the applicable standards based on the specific area and industry requirements to ensure compliance with the desired accuracy standards.

Here are the corresponding relationships between gear accuracy grades in common standards:

1. ISO Standard (ISO 1328):

– Accuracy Grades: 1, 2, 3, 4, 5, 6, 7, 8, 9

– Accuracy Grade Symbols: N, 5N, 6N, 7N, 8N, 9N

2. AGMA Standard (AGMA 2000-A88):

– Accuracy Grades: 12, 11, 10, 9, 8, 7, 6, 5, 4

– Accuracy Grade Symbols: AA, A, B, C, D, E, F, G, H

3. DIN Standard (DIN 3962):

– Accuracy Grades: 1, 2, 3, 4, 5, 6, 7, 8, 9

– Accuracy Grade Symbols: DIN 1, DIN 2, DIN 3, DIN 4, DIN 5, DIN 6, DIN 7, DIN 8, DIN 9

Please note that different countries and standard organizations may have different gear accuracy grade naming systems and symbols. The abovementioned ones are common in ISO, AGMA, and DIN standards. However, referring to the applicable standards and specifications is essential in specific applications to ensure the correct selection and comparison of gear accuracy grades.