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Selecting the correct replacement component for military vehicles such as the HMMWV and Otokar Cobra should not be based solely on a general product name or visual similarity. Components that perform a similar function can differ according to the vehicle variant, production configuration, installation position, dimensions, technical specifications and system application.
For this reason, the NSN, NATO Stock Number, and the part number are among the most important references used to identify military vehicle spare parts accurately.
The REPA Manufacturing Group HMMWV and Otokar Cobra spare parts category includes components from different vehicle systems, such as suspension control arms, exhaust pipes, a CTIS valve, a fan cut-off sensitive switch and a flywheel. Many of these products are identified using an NSN, part number and cross-reference information.
What Is an NSN?
NSN stands for NATO Stock Number. It is a 13-digit identification number used within the NATO Codification System to identify an item of supply, or a group of functionally interchangeable items, in a standardized format.
The NSN system helps distinguish components that may have similar names but different technical characteristics. It also enables procurement, maintenance, inventory and logistics teams in different countries to use a common item-identification system.
An NSN is particularly useful for:
- Identifying the required component
- Comparing inventory records
- Searching for alternative supply sources
- Matching a product with technical documentation
- Preparing procurement requests
- Managing maintenance and repair records
- Reducing the risk of ordering an incorrect component
- Improving communication between suppliers and purchasing teams
For example, searching only for an HMMWV suspension arm may not be sufficient. The component may differ according to its right-hand or left-hand installation position, vehicle configuration or technical specifications. In this situation, the NSN and part number become essential references.
For a more detailed overview of the codification system, read What Is an NSN and How Is a NATO Stock Number Used?.
What Is a Part Number?
A part number, commonly abbreviated as P/N, is a reference assigned to a component by a manufacturer, design authority or technical documentation system.
Part numbers are generally used to:
- Match a component with its technical drawing
- Review manufacturer records
- Confirm vehicle or system compatibility
- Distinguish different product revisions
- Manage quotation and ordering processes
- Research alternative and cross-reference numbers
- Identify the design configuration of a component
An NSN and a part number do not perform exactly the same function.
An NSN identifies an item of supply within a standardized codification system. A part number may be associated with a specific manufacturer, technical design, drawing or product configuration.
Whenever possible, both the NSN and part number should be included in a military vehicle spare-parts request.
What Is the Difference Between an NSN and a Part Number?
| Identification data | Primary purpose | Common users |
|---|---|---|
| NSN | Identifies an item of supply within the NATO Codification System | Government agencies, logistics units, maintenance centers and defense suppliers |
| Part number, P/N | Identifies a specific product design or manufacturer reference | Manufacturers, engineering teams, maintenance units and purchasing departments |
| Cross-reference number | Connects related product references used in different catalogs | Suppliers, distributors and technical purchasing teams |
| Technical drawing number | Defines dimensional, tolerance and manufacturing requirements | Manufacturing, engineering and quality-control teams |
Using all available identification information together improves the accuracy of product matching.
How Should the Correct HMMWV or Otokar Cobra Part Be Identified?
A systematic verification process should be followed when selecting a replacement component for an HMMWV or Otokar Cobra vehicle.
1. Identify the Vehicle Model and Variant
The first step is to identify the vehicle platform and, whenever possible, the exact vehicle variant.
A request that includes only a general description such as "Hummer part" or "Cobra part" may not provide enough information for accurate product identification.
The request should include:
- Vehicle manufacturer
- Vehicle model
- Vehicle variant
- Production configuration, when available
- Relevant technical system
- Existing product reference
Different configurations may use components with similar names but different dimensions, connection points or operating characteristics.
2. Identify the Relevant Vehicle System
The system in which the component is used should also be specified.
Examples include:
- Suspension system
- Steering system
- Exhaust system
- Engine and drivetrain system
- Electrical system
- Cooling system
- Central Tire Inflation System
- Brake system
- Pneumatic system
System information helps distinguish between products with similar names or physical appearances.
3. Confirm the Installation Position
Certain suspension, exhaust and steering components have separate right-hand and left-hand versions.
The suspension control arms listed in the REPA HMMWV and Otokar Cobra product range demonstrate this distinction:
- Left suspension control arm
Part number: 12460167B1
NSN: 2530-01-414-7844 - Right suspension control arm
Part number: 12460151B1
NSN: 2530-01-554-8340
Although both products are suspension control arms, they have different installation positions, part numbers and NATO Stock Numbers.
This is why the installation side should always be included in the quotation request.
4. Compare the NSN and Part Number Together
When both an NSN and a part number are available, they should be submitted and compared together.
Differences between the number marked on an existing product and the number shown in technical documentation may result from:
- A different product revision
- An alternative manufacturer reference
- A superseded part number
- A cross-reference number
- A different vehicle configuration
- An incomplete or damaged product marking
- A cataloging update
When reference numbers do not match, the component should not be ordered solely on the basis of one number. Dimensions, connection points, installation position and technical application should also be verified.
5. Use a Technical Drawing or Physical Sample
When an NSN or part number is unavailable, the component may be evaluated using a technical drawing, clear product photographs or a physical sample.
A technical drawing should ideally include:
- Overall dimensions
- Hole diameters and positions
- Connection dimensions
- Material specification
- Heat-treatment requirements
- Surface treatment or coating
- Dimensional tolerances
- Welding details
- Assembly details
- Installation direction
- Drawing revision number
Components that are difficult to source or no longer supported through their original supply chain may be evaluated through REPA’s custom manufacturing capability.
Examples of NSN and Part-Number Use in HMMWV and Otokar Cobra Components
The components listed in REPA’s HMMWV and Otokar Cobra category demonstrate why technical identification information is necessary.
Suspension Control Arms
Suspension control arms can have different references according to their installation position.
The left HMMWV and Otokar Cobra suspension control arm is identified by:
- Part number: 12460167B1
- NSN: 2530-01-414-7844
- Installation position: Left
The right HMMWV and Otokar Cobra suspension control arm is identified by:
- Part number: 12460151B1
- NSN: 2530-01-554-8340
- Installation position: Right
This example shows why a general term such as "suspension control arm" is not sufficient for accurate component selection.
Exhaust Pipes
Installation direction and cross-reference information are also important for exhaust-system components.
The left HMMWV and Otokar Cobra exhaust pipe is identified by:
- NSN: 2990-01-437-1022
- Part number: 10239026
- Cross-reference: GEP18000089
- Installation position: Left
The right HMMWV and Otokar Cobra exhaust pipe has different identification information:
- NSN: 2990-01-437-1020
- Part number: 10239025
- Cross-reference: GEP18000088
- Installation position: Right
The product names are similar, but the NSNs, part numbers and cross-reference numbers help identify the correct installation side.
Central Tire Inflation System Valve
CTIS stands for Central Tire Inflation System. The system allows tire pressure to be managed according to different terrain and operational conditions.
The HMMWV and Otokar Cobra CTIS valve listed in the REPA product catalog is identified by:
- Product name: Central Tire Inflation System Valve, Hummer/Kobra 2
- Part number: 91A03-11050
- System: Central Tire Inflation System
A request that states only "tire inflation valve" may not be sufficiently precise. The vehicle model, system configuration, connection properties and part number should be evaluated together.
Fan Cut-Off Sensitive Switch
Electrical and cooling-system components can appear physically similar while having different operating characteristics.
The Fan Cut-Off Sensitive Switch for Hummer/Kobra 1 is identified by:
- NSN: 5930-01-433-3142
- Part number: 12460518
- Application: Fan-control system
For electrical components, the connector type, operating requirements and system compatibility should be checked in addition to the NSN and part number.
Flywheel and Drivetrain Component
The Flywheel for Hummer/Kobra 1 is identified by:
- NSN: 2815-01-148-3771
- Part number: 140077157
- Product group: Engine and drivetrain component
Dimensional compatibility, connection geometry and vehicle configuration are critical for drivetrain components. The NSN and part number should therefore be treated as the starting point of the technical verification process.
Why Is Selecting a Component Only by Its Photograph Risky?
Military vehicle components may look similar while having important technical differences.
Visual similarity can be misleading in areas such as:
- Hole positions
- Connection geometry
- Right-hand or left-hand installation
- Wall thickness
- Material grade
- Heat-treatment properties
- Surface coating
- Thread dimensions
- Operating pressure
- Electrical connections
- Dimensional tolerances
- Product revisions
- Welding details
A photograph should therefore not be used as the only basis for component selection.
Product images should be supported by the available NSN, part number, dimensions, vehicle information and technical documentation.
Common Mistakes in Military Spare-Parts Requests
Incomplete or incorrect information can delay the quotation, engineering and procurement process.
The most common mistakes include the following.
Providing Only a General Product Name
Descriptions such as "control arm," "exhaust pipe" or "CTIS valve" may not identify the required component precisely.
The request should include the exact application, installation position and available reference numbers.
Failing to Specify the Vehicle Model
Similar components may be used on different tactical vehicle platforms. The vehicle model and, when known, the vehicle variant should always be included.
Omitting Right-Hand or Left-Hand Information
Suspension arms, exhaust pipes and other directional components may have different part numbers for each installation side.
Omitting this information can result in incorrect product matching.
Confusing the NSN With the Part Number
An NSN and a manufacturer part number are different types of identification data.
The request should clearly indicate which number is an NSN, which number is a part number and which reference is a cross-reference.
Ordering According to an Old or Incomplete Number
A marking on an existing component may be worn, incomplete or associated with an older product reference.
The number should be checked against current documentation, product dimensions and technical application.
Ignoring the Technical Drawing Revision
Different revisions may exist for a product or drawing reference.
When a technical drawing is used, the revision date, revision code and applicable change notes should be reviewed.
How Can Obsolete or Difficult-to-Source Components Be Procured?
Military vehicles often remain in operational service for many years. During this period, some components may become difficult to obtain through their original supply channels.
Common reasons include:
- The original component is no longer manufactured
- The original supplier no longer supports the product
- Minimum order quantities have increased
- Existing technical documentation is outdated
- Replacement components require adaptation
- The original part number has been superseded
- The component is available only through limited international sources
In these situations, the component may be evaluated using:
- NSN
- OEM part number
- Manufacturer part number
- Cross-reference number
- Technical drawing
- Physical sample
- Product photographs
- Dimensional inspection results
- Material analysis
- Operating conditions
- Installation information
REPA Manufacturing Group can evaluate project-specific manufacturing options using a physical sample, technical drawing, dimensions or existing product references.
Information about REPA’s CNC machining and production infrastructure is available on the machinery park page.
What Information Should Be Included in a Request for Quotation?
Providing complete technical and commercial information helps accelerate the product evaluation and quotation process.
A spare-parts request should include the following details whenever available:
- Vehicle manufacturer and model
- Vehicle variant
- Product name
- NSN
- Part number
- Cross-reference number
- Right-hand or left-hand installation position
- Required quantity
- Technical drawing
- Drawing revision number
- Photographs of the existing component
- Physical sample availability
- Material requirements
- Surface treatment or coating requirements
- Inspection and testing requirements
- Delivery country
- Required delivery terms
You can search the complete REPA product catalog using a product name, NSN or cross-reference number.
Components for other tactical and armored vehicle platforms can be reviewed under military vehicle spare parts.
Why Are Quality and Traceability Important When Selecting a Supplier?
Identifying the correct NSN and part number is only the first stage of a military spare-parts procurement process.
The supplied or manufactured component must also meet the relevant technical requirements.
A supplier evaluation should consider:
- Quality-management systems
- Material traceability
- Dimensional inspection capability
- Technical drawing interpretation
- CNC machining capacity
- Welding and assembly capability
- Surface-treatment processes
- Manufacturing records
- Final inspection procedures
- Nonconformity management
- Packaging and preservation requirements
- Product identification
- Batch-level traceability
- Testing and reporting capability
REPA Manufacturing Group’s quality-management documentation can be reviewed on the certificates page.
Correct Component Selection Starts With Correct Identification
A product name or physical resemblance alone is not sufficient when selecting HMMWV and Otokar Cobra spare parts.
The following information should be evaluated together:
- Vehicle model
- Vehicle variant
- Technical system
- Installation position
- NSN
- Part number
- Cross-reference number
- Technical drawing
- Drawing revision
- Product dimensions
- Material requirements
The NSN provides a standardized identification reference within the codification system. The part number helps identify the relevant manufacturer reference, design or technical configuration.
Using these references together reduces the risk of an incorrect order and supports a more efficient technical evaluation process.
You can review the available suspension, exhaust, CTIS, electrical and drivetrain components through the HUMMER HMMWV and OTOKAR COBRA spare-parts category.
When the required product is not listed, submit the available NSN, part number, technical drawing, photographs or physical sample through the REPA Manufacturing Group contact page.
Frequently Asked Questions
Are an NSN and a part number the same thing?
No. An NSN is a 13-digit code used to identify an item of supply within the NATO Codification System. A part number is a reference assigned by a manufacturer, design authority or technical documentation system.
Can an HMMWV spare part be identified using only an NSN?
An NSN is a strong identification reference, but the vehicle variant, part number, installation position and technical system should also be checked.
What information is required for an Otokar Cobra spare-parts request?
The request should include the vehicle model, product name, NSN, part number, required quantity and available technical documentation. Right-hand or left-hand installation information should also be provided when applicable.
Can a part be manufactured when no NSN is available?
A component without an NSN may be evaluated using a technical drawing, physical sample, product photographs, dimensions or an existing part number. Manufacturability is determined after reviewing the available technical information.
Do the right-hand and left-hand suspension control arms have different NSNs?
Yes. The REPA left suspension control arm is identified by NSN 2530-01-414-7844. The right suspension control arm is identified by NSN 2530-01-554-8340.
Where can I review HMMWV and Otokar Cobra spare parts?
Suspension control arms, exhaust pipes, the CTIS valve, the fan cut-off sensitive switch and the flywheel can be reviewed in the HMMWV and Otokar Cobra spare-parts category.
How can I request a quotation?
Submit the vehicle model, product name, NSN, part number, required quantity and available technical documents through the contact page.