Short answer
DENUE lists 47 steering and suspension parts plants with 11 or more staff in Aguascalientes, Guanajuato, Querétaro and San Luis Potosí. 39 have 51 or more staff, and 27 of those match an IMMEX program on exact name and postal code. Querétaro has the most, with 17. Each plant still needs its own checks.
Key facts
- Activity codes (SCIAN)
- 336330
- Plants, 11+ staff
- 47
- Data
- INEGI DENUE bulk files, 25 Sep 2026; IMMEX directory, August 2026 edition
About steering and suspension parts
Steering and suspension parts are safety relevant. Buyers usually require a certified quality system and full traceability.
The numbers by state
| State | Plants, 11+ staff | With 51+ staff | With an IMMEX match |
|---|---|---|---|
| Querétaro | 17 | 13 | 11 |
| Guanajuato | 15 | 11 | 9 |
| San Luis Potosí | 12 | 12 | 8 |
| Aguascalientes | 3 | 3 | 1 |
| Four states | 47 | 39 | 29 |
| Staff band | Plants |
|---|---|
| 11 to 30 | 6 |
| 31 to 50 | 2 |
| 51 to 100 | 3 |
| 101 to 250 | 12 |
| 251 or more | 24 |
What to ask a steering and suspension supplier
Registries show that a plant exists and exports. These questions cover what they cannot.
- IATF 16949 certificate, confirmed with the issuing body.
- Traceability from raw material to shipped part.
- Fatigue and torque testing and their records.
- Change control: how a process change is notified.
- Launch history with comparable parts.
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 steering and suspension parts plants are in the Bajío?
INEGI’s DENUE lists 47 steering and suspension parts plants with 11 or more staff across Aguascalientes, Guanajuato, Querétaro and San Luis Potosí. 39 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 steering and suspension parts plants?
Among the four states Testigo counted, Querétaro has the most steering and suspension parts plants in DENUE, with 17 of 47, followed by Guanajuato (15). Plants elsewhere in Mexico are outside Testigo’s pilot, and counts are establishments in INEGI’s directory as of 25 September 2026.
Do steering and suspension parts plants in the Bajío export under IMMEX?
Some do. 29 of the 47 plants match an IMMEX program on exact name and postal code, and 27 of the 39 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.