Short answer
DENUE lists 143 stamping and forging plants with 11 or more staff in Aguascalientes, Guanajuato, Querétaro and San Luis Potosí. 102 have 51 or more staff, and 47 of those match an IMMEX program on exact name and postal code. Querétaro has the most, with 57. Each plant still needs its own checks.
Key facts
- Activity codes (SCIAN)
- 336370 and 332110
- Plants, 11+ staff
- 143
- Data
- INEGI DENUE bulk files, 25 Sep 2026; IMMEX directory, August 2026 edition
About stamping and forging
Stamping presses shape sheet or coil metal into parts with dies. This group also includes forged products (332110), so it counts some metal plants that are not auto specific.
The numbers by state
| State | Plants, 11+ staff | With 51+ staff | With an IMMEX match |
|---|---|---|---|
| Querétaro | 57 | 37 | 15 |
| Guanajuato | 37 | 26 | 16 |
| San Luis Potosí | 32 | 23 | 12 |
| Aguascalientes | 17 | 16 | 8 |
| Four states | 143 | 102 | 51 |
| Staff band | Plants |
|---|---|
| 11 to 30 | 24 |
| 31 to 50 | 17 |
| 51 to 100 | 28 |
| 101 to 250 | 37 |
| 251 or more | 37 |
What to ask a stamping supplier
Registries show that a plant exists and exports. These questions cover what they cannot.
- Press tonnage and bed sizes, against the part you need.
- Who owns and maintains the dies, and where the tooling will sit.
- Capability data on the critical features and the PPAP level they can support.
- Steel sourcing and material certificates traceable to the coil.
- Secondary operations in house: welding, coating, assembly.
Checks before you approach a plant
- Confirm the plant in DENUEName, address, activity code and staff band.
- Check its IMMEX programStatus and type, matched on legal name and postal code.
- Search the SAT 69-B listBy RFC where you have it, otherwise by exact name.
The verification guide explains each step and where it stops.
Frequently asked questions
How many stamping and forging plants are in the Bajío?
INEGI’s DENUE lists 143 stamping and forging plants with 11 or more staff across Aguascalientes, Guanajuato, Querétaro and San Luis Potosí. 102 of them have 51 or more staff. Testigo counted these from INEGI’s bulk files on 25 September 2026.
Which Bajío state has the most stamping and forging plants?
Among the four states Testigo counted, Querétaro has the most stamping and forging plants in DENUE, with 57 of 143, followed by Guanajuato (37). Plants elsewhere in Mexico are outside Testigo’s pilot, and counts are establishments in INEGI’s directory as of 25 September 2026.
Do stamping and forging plants in the Bajío export under IMMEX?
Some do. 51 of the 143 plants match an IMMEX program on exact name and postal code, and 47 of the 102 with 51 or more staff. A plant with no match may still export through a shelter company’s program, so ask which entity holds it.