Spare parts codification is an important process in industrial maintenance and stores management. It helps create a clear and organized system for identifying, searching, purchasing, storing, and issuing spare parts.
In industrial plants, poor spare parts codification can cause duplicate materials, wrong purchases, long searching time, stock confusion, and maintenance delays.
A good codification system helps maintenance, procurement, warehouse, and finance teams work more efficiently.
What Is Spare Parts Codification?
Spare parts codification is the process of giving each spare part a unique material code and a clear technical description.
The material code is used to identify the item in systems such as:
- SAP
- ERP systems
- CMMS
- Warehouse systems
- Inventory systems
- Purchase requisitions
- Purchase orders
- Store issue requests
Each spare part should have one unique code and one clear description.
Why Spare Parts Codification Is Important
Spare parts codification is important because maintenance teams depend on correct spare parts during preventive maintenance and breakdowns.
Good codification helps:
- Avoid duplicate items
- Reduce wrong purchases
- Improve stock control
- Speed up material searching
- Improve procurement accuracy
- Support maintenance planning
- Improve inventory value control
- Reduce downtime
- Improve reporting
- Support standardization
Without codification, spare parts management becomes confusing.
Common Problems Without Proper Codification
Poor codification can create many problems, such as:
- Same item created with different codes
- Wrong technical description
- Missing part number
- Missing size or rating
- Different spelling for same item
- Unclear material name
- Wrong unit of measure
- Duplicate stock
- Wrong spare part issued
- Long procurement clarification
- Store rejection
- Maintenance delay
Example:
One bearing may appear in the system as:
- Bearing 6310
- Ball bearing 6310
- BRG 6310-2RS
- SKF bearing
- Bearing for pump
This creates confusion and duplicate stock.
Main Objectives of Codification
The main objectives are:
- Create unique material codes
- Standardize item descriptions
- Improve searchability
- Avoid duplicate materials
- Support correct procurement
- Improve warehouse control
- Support maintenance planning
- Improve spare parts history
- Make inventory more reliable
A good codification process should be consistent and easy to use.
What Information Is Needed for Codification?
Before creating a spare part code, collect technical information.
Useful information includes:
- Item name
- Part number
- Model number
- Manufacturer
- Brand
- Size
- Rating
- Material
- Voltage
- Current
- Pressure rating
- Temperature rating
- Connection type
- Application
- Equipment tag number
- Unit of measure
- Drawing or datasheet
- Photo of old item
- OEM manual reference
The required information depends on the item type.
Standard Spare Parts Description Format
A good spare part description should follow a standard format.
Basic format:
ITEM NAME, TYPE, SIZE/RATING, PART NUMBER, BRAND, MATERIAL, APPLICATION
Example:
BEARING, BALL, 6310-2RS, SKF OR EQUIVALENT
Another example:
CONTACTOR, 3P, AC-3, 32A, COIL 230VAC, PN: LC1D32P7, SCHNEIDER
Electrical Spare Parts Codification
Electrical spare parts require accurate ratings.
Important details include:
- Item type
- Voltage
- Current
- Power rating
- Number of poles
- Coil voltage
- Frequency
- Breaking capacity
- Part number
- Brand
- Mounting type
- Control supply
- Accessories
Electrical Item Examples
Contactor
Good description:
CONTACTOR, 3P, AC-3, 32A, COIL 230VAC, PN: LC1D32P7, SCHNEIDER
Important details:
- 3 poles
- AC-3 duty
- Current rating
- Coil voltage
- Part number
- Brand
Circuit Breaker
Good description:
CIRCUIT BREAKER, MCCB, 3P, 100A, 415VAC, 36KA, THERMAL MAGNETIC, SCHNEIDER OR EQUIVALENT
Important details:
- MCCB type
- Number of poles
- Current rating
- Voltage rating
- Breaking capacity
- Trip unit type
- Brand
Soft Starter
Good description:
SOFT STARTER, PN: 3RW4047-1BB14, SIEMENS, 200-480VAC, CONTROL SUPPLY 110-230VAC
Important details:
- Part number
- Brand
- Voltage range
- Control supply
- Motor application
Mechanical Spare Parts Codification
Mechanical spare parts require size, material, rating, and application details.
Important details include:
- Item type
- Size
- Material
- Part number
- Model
- Pressure rating
- Temperature rating
- Connection type
- Bearing number
- Seal type
- Fluid compatibility
- Application
Mechanical Item Examples
Bearing
Good description:
BEARING, DEEP GROOVE BALL, 6310-2RS, RUBBER SEALED, SKF/FAG/NSK OR EQUIVALENT
Important details:
- Bearing type
- Bearing number
- Seal type
- Brand or equivalent
Mechanical Seal
Good description:
MECHANICAL SEAL, 35MM, CARBON/CERAMIC, NBR, SS304, FOR CENTRIFUGAL WATER PUMP
Important details:
- Size
- Face material
- Elastomer material
- Metal material
- Application
Valve
Good description:
BALL VALVE, 2 INCH, SS316 BODY, FLANGED, PN16, PTFE SEAT, FULL BORE
Important details:
- Valve type
- Size
- Body material
- Connection type
- Pressure rating
- Seat material
- Bore type
HVAC Spare Parts Codification
HVAC spare parts may include filters, compressors, fan motors, belts, capacitors, thermostats, and sensors.
Important details include:
- Unit type
- Model number
- Capacity
- Voltage
- Power
- Size
- Refrigerant type
- Filter dimensions
- Motor speed
- Application
Example:
FILTER, AIR, PANEL TYPE, 24X24X2 INCH, MERV 8, FOR HVAC AHU
Example:
FAN MOTOR, 0.75KW, 3PH, 400VAC, 50HZ, 1450RPM, IP55, FOOT MOUNTED
Instrumentation Spare Parts Codification
Instrumentation descriptions should be very specific.
Important details include:
- Measuring range
- Output signal
- Supply voltage
- Process connection
- Material
- Accuracy
- IP rating
- Communication protocol
- Calibration requirement
Example:
PRESSURE TRANSMITTER, 0-10 BAR, 4-20MA, 24VDC, 1/2 INCH NPT, SS316, IP65
Unit of Measure
Correct unit of measure is very important.
Common units include:
- EA for each
- PCS for pieces
- SET for set
- MTR for meter
- ROLL for cable or hose roll
- LTR for liter
- KG for kilogram
- BOX for box
- PAIR for pair
Avoid unclear units.
If using SET, define what is included in the set.
Material Grouping
Spare parts can be grouped by category.
Examples:
- Electrical
- Mechanical
- HVAC
- Instrumentation
- Safety
- Consumables
- Bearings
- Valves
- Cables
- Filters
- Fasteners
- Lubricants
Material grouping helps search, reporting, and inventory control.
Avoiding Duplicate Codes
Before creating a new code, always search the system.
Search by:
- Part number
- Item name
- Brand
- Size
- Model
- Old description
- Equipment tag
- Manufacturer number
Duplicate codes increase stock value and create confusion.
Codification Checklist
| Check Point | What to Verify |
|---|---|
| Item name | Clear and standard |
| Part number | Included if available |
| Brand | Included if required |
| Size/rating | Clearly mentioned |
| Material | Included when important |
| Application | Mentioned if useful |
| Unit | Correct unit of measure |
| Duplicate check | Existing code searched |
| Datasheet | Attached if available |
| Photo | Attached if useful |
| Category | Correct material group |
| Description | Standard format used |
Good vs Poor Codification Examples
Poor description:
Bearing for motor
Good description:
BEARING, DEEP GROOVE BALL, 6310-2RS, RUBBER SEALED, SKF/FAG/NSK OR EQUIVALENT
Poor description:
Relay 24V
Good description:
RELAY, CONTROL, 24VDC COIL, 2CO, 5A CONTACT RATING, PLUG-IN TYPE, WITH BASE
Poor description:
Valve 2 inch
Good description:
BALL VALVE, 2 INCH, SS316 BODY, FLANGED, PN16, PTFE SEAT, FULL BORE
Common Codification Mistakes
Common mistakes include:
- Creating duplicate codes
- Writing vague descriptions
- Missing part number
- Missing voltage or size
- Missing material
- Wrong unit of measure
- Using different names for same item
- Not attaching datasheet
- Not checking existing stock
- Mixing brand and item name incorrectly
- Using informal words
- Creating code without technical review
Role of Maintenance Engineer
The maintenance engineer plays an important role in codification.
The engineer should:
- Provide correct technical description
- Verify part number
- Confirm application
- Review equivalent acceptance
- Attach photos or datasheets
- Check critical specifications
- Avoid duplicate requests
- Support procurement clarification
- Confirm technical acceptance
A good engineer helps create clean and useful material master data.
Role of Warehouse
The warehouse team should:
- Check if material already exists
- Verify stock availability
- Store items properly
- Use correct material code
- Avoid issuing wrong spare parts
- Support physical verification
- Maintain bin location
- Report duplicate or obsolete items
Role of Procurement
Procurement should use the correct material code and description when sending RFQ or PO.
Procurement should also request technical clarification when supplier offers an alternative.
Wrong purchasing often starts from unclear codification.
Practical Field Example
A technician requests a spare bearing for a pump but writes only:
“Bearing for pump”
The warehouse cannot identify the item. Procurement asks for clarification. The job is delayed.
A better request would be:
“BEARING, DEEP GROOVE BALL, 6310-2RS, RUBBER SEALED, SKF OR EQUIVALENT, FOR PUMP P-101 MOTOR”
This description is clear enough for warehouse, procurement, and supplier.
Codification for Critical Spare Parts
Critical spare parts should have more detailed descriptions.
Examples include:
- Protection relays
- Soft starters
- VFDs
- PLC modules
- Mechanical seals
- Compressor parts
- Crane brake parts
- Fire pump parts
- Transformer accessories
For critical spares, attach datasheets, manuals, drawings, or OEM references.
Obsolete Spare Parts
Some spare parts become obsolete.
When this happens:
- Identify original part
- Contact OEM or supplier
- Get replacement recommendation
- Compare datasheets
- Update material master
- Keep old and new reference
- Inform maintenance team
- Update stock strategy
Obsolete parts should be managed carefully to avoid emergency problems.
Spare Parts Description Rules
Good description rules:
- Use uppercase if company standard requires it
- Start with item name
- Add type
- Add size or rating
- Add part number
- Add brand
- Add material
- Add application if needed
- Avoid unnecessary words
- Keep description consistent
- Use standard abbreviations only
Safety and Quality Notes
Wrong codification can lead to wrong spare part installation.
This can create safety hazards, equipment damage, or production stoppage.
For critical systems, technical review is required before creating or approving material codes.
Do not create spare part codes based only on appearance.
Conclusion
Spare parts codification is essential for professional maintenance and inventory management.
A good codification system helps identify items clearly, avoid duplicates, improve procurement accuracy, reduce downtime, and support maintenance planning.
Maintenance engineers should provide accurate descriptions, part numbers, ratings, materials, applications, and datasheets when requesting new material codes.
Good codification improves communication between maintenance, warehouse, procurement, and suppliers.
