Gear Accuracy Grade Comparison Table: AGMA vs DIN vs JIS vs ISO

Your comprehensive guide to understanding and selecting the right gear accuracy standards for global manufacturing excellence.

The required gear accuracy grade should be determined based on the application and operating conditions, such as transmission purpose, service environment, efficiency targets, pitch line velocity, and other economic and technical factors. If you are unsure, Wenlio’s engineers can help you select the right accuracy grade.

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Why Gear Accuracy Grades Matter

Performance & Reliability

Gear accuracy directly impacts the performance, noise levels, durability, and overall reliability of mechanical systems across all industries.

Quality Consistency

International standards ensure seamless interchangeability and maintain consistent quality across global manufacturing operations and supply chains.

Cost-Precision Balance

Selecting the appropriate accuracy grade enables you to optimize the critical balance between manufacturing costs and precision requirements for your application.

Below is a comparison table of common gear machining accuracy grades such as U.S. standard AGMA, German standard DIN, Japanese standard JIS, and international standard ISO. It is provided for reference only. If anything is unclear or you have gear machining requirements, you are welcome to contact Wenlio for a free consultation.

Accuracy Standard	Accuracy Grade
	1	2	3	4	5	6	7	8	9	10	11	12
German Standard (DIN)	1	2	3	4	5	6	7	8	9	10	11	12
U.S. Standard (ANSI)					4	5	2	1
U.S. Standard (AGMA)		16	15	14	13	12	11	10	9	8	7	6
Japanese Standard (JIS)				0	1	2	3	4	5	6	7	8
International Standard (ISO)	1	2	3	4	5	6	7	8	9	10	11	12
China Standard (GB)			3	4	5	6	7	8	9
French Standard (FN)				A	B	C	D	E
British Standard (BS)					A1	A1	B	C	D

Overview of Major Gear Accuracy Standards

AGMA uses ascending numbers where higher values indicate greater precision. AGMA 15 represents very high precision, while AGMA 3 indicates lower accuracy levels.

DIN/JIS/ISO employ descending numbers where lower values mean higher precision. DIN 1, JIS 0, or ISO 1 represent the highest accuracy achievable.

AGMA

American Gear Manufacturers Association standard, predominantly used throughout North America. Grades range from 3 (lowest precision) to 15 (highest precision), with higher numbers indicating superior accuracy.

DIN

Deutsches Institut für Normung represents the German and broader European standard. Grades span from 1 (highest precision) to 12 (lowest), widely adopted in European manufacturing.

JIS

Japanese Industrial Standards govern precision manufacturing across Asia. Grades range from 0 (highest precision) to 12 (lowest), commonly specified in Asian markets and high-tech industries.

ISO

International Organization for Standardization provides the global benchmark. Grades extend from 1 (highest precision) to 12 (lowest), facilitating multinational supply chain compatibility.

Real-World Examples and Case Studies

European Automotive

European automotive gearboxes consistently specify DIN 6 accuracy to achieve ultra-low noise operation and extended service life.

U.S. Aerospace

American aerospace actuator systems typically mandate AGMA 14 or higher grades for mission-critical precision where failure is not an option.

Japanese Precision

Japanese precision instruments and metrology equipment commonly employ JIS 0 or 1 grades to achieve ultra-high accuracy in measurement applications.

Global Manufacturing

Multinational manufacturers strategically adopt ISO 5–7 grades to optimize the balance between cost efficiency and performance across worldwide operations.

Summary: Choosing the Right Gear Accuracy Standard

Key Takeaways:
Master gear accuracy standards to optimize your manufacturing processes and ensure global compatibility in your supply chain operations.

Assess Requirements

Thoroughly understand your application’s specific precision, noise tolerance, and durability requirements before specification.

Match Standards

Align gear accuracy grades with your industry sector and regional manufacturing standards for optimal compatibility.

Balance Specifications

Avoid over-specifying to reduce unnecessary costs; avoid under-specifying to prevent premature failure and costly downtime.

Verify Certifications

Always confirm supplier certifications and measurement methodologies to ensure compliance with specified accuracy standards.

Use this comparison as your authoritative guide to navigate the complex landscape of international gear accuracy standards with confidence and precision.
If you are unsure, Wenlio’s engineers can help you select the right accuracy grade.