AGMA and ISO Standards for Gear Couplings Explained
Understand key standards that govern gear coupling design, testing, and selection.
International standards ensure gear coupling quality, interchangeability, and reliable performance. Understanding AGMA and ISO standards helps specifiers and users make informed decisions.
Key Standards Overview
AGMA Standards (American)
The American Gear Manufacturers Association publishes:
| Standard | Coverage |
|---|---|
| AGMA 9002 | Flexible coupling selection |
| AGMA 9001 | Lubrication of industrial couplings |
| AGMA 9003 | Nomenclature |
| AGMA 945 | Inspection and testing |
ISO Standards (International)
The International Organization for Standardization covers:
| Standard | Coverage |
|---|---|
| ISO 14691 | Flexible couplings - classification |
| ISO 10441 | Petroleum - flexible couplings |
| ISO 15364 | Alignment requirements |
| ISO 17025 | Testing laboratory competence |
AGMA 9002: Coupling Selection
Scope
AGMA 9002 provides:
- Terminology definitions
- Selection procedures
- Service factor guidelines
- Application examples
Service Factor Tables
Standard service factors by application:
| Driver | Driven Equipment | SF |
|---|---|---|
| Electric motor | Uniform load | 1.5 |
| Electric motor | Moderate shock | 2.0 |
| Electric motor | Heavy shock | 2.5 |
| IC engine | Variable torque | 2.5+ |
Selection Process
Per AGMA 9002:
- Calculate normal operating torque
- Apply appropriate service factor
- Consider additional factors (starts, reversing)
- Select coupling with adequate rating
ISO 14691: Flexible Couplings
Classification
ISO 14691 defines:
- Coupling types and categories
- Performance characteristics
- Testing requirements
- Dimensional standardization
Performance Classes
| Class | Characteristic |
|---|---|
| Type A | Torque limiting |
| Type B | Misalignment compensating |
| Type C | Torsionally flexible |
| Type D | Combined functions |
Gear couplings fall primarily under Type B.
Testing Requirements
ISO specifies tests for:
- Torque capacity
- Misalignment capability
- Torsional stiffness
- Fatigue resistance
Material Standards
Steel Specifications
Standards for coupling materials:
| Standard | Material | Application |
|---|---|---|
| EN 10083-3 | 42CrMo4 | Hubs |
| EN 10084 | 16MnCr5 | Case-hardened parts |
| EN 10250-4 | Alloy steel forgings | Heavy-duty |
Heat Treatment
References for hardening:
| Standard | Coverage |
|---|---|
| ISO 6336 | Gear material heat treatment |
| ASTM E140 | Hardness conversion |
| EN ISO 683 | Steel specifications |
Dimensional Standards
Bore and Keyway
| Standard | Coverage |
|---|---|
| ISO 286 | Tolerances and fits |
| DIN 6885 | Parallel keys |
| IS 2048 | Keys and keyways |
| BS 4235 | Metric keys |
Flange Patterns
| Standard | Coverage |
|---|---|
| ISO 5211 | Industrial valve actuator flanges |
| DIN 6281 | Coupling flanges |
| AGMA 9001 | Coupling dimensions |
Quality and Testing
Inspection Standards
| Standard | Coverage |
|---|---|
| ISO 2768 | General tolerances |
| ISO 10360 | CMM calibration |
| ISO 17025 | Laboratory competence |
Non-Destructive Testing
| Method | Standard |
|---|---|
| Magnetic particle | ISO 9934 |
| Dye penetrant | ISO 3452 |
| Ultrasonic | ISO 16810 |
Compliance Benefits
Following standards provides:
- Consistent quality expectations
- International interchangeability
- Clear specification basis
- Dispute resolution framework
SMI Standards Compliance
We manufacture gear couplings per:
- AGMA 9002 design principles
- ISO dimensional requirements
- International material standards
- Customer specification overlays
Contact SMI for standards-compliant coupling specifications.
Further Reading
Super Mech Industries — Odhav, Ahmedabad, Gujarat 382415, India. Phone: +91 63510 70577. Email: smigvs@gmail.com. ISO 9001:2015 certified.