At MODEPSA, the manufacture of the mill bolt follows a comprehensive approach to control, precision and traceability, designed to meet the demands of the mining sector. Every stage of the process is carried out internally, without outsourcing, guaranteeing absolute control over the quality of the final product.
A process controlled from start to finish
1. Raw material control
The process begins with rigorous quality controls on the steel bars: dimensional inspections, chemical analysis and mechanical tests that ensure compliance with technical specifications before entering production.
2. Forging in induction furnaces
Material cutting and head forming are performed by forging in induction furnaces, a technology that produces a homogeneous metallurgical structure and high mechanical strength — key to guaranteeing the bolt’s structural integrity under high load and wear conditions.
3. Rolled thread, not machined
Threading is performed on rolling machines using the rolled-thread method: a process that does not remove material but deforms it, significantly improving resistance to fatigue and thread wear compared with traditional cutting methods.
4. Heat treatment monitored with IoT
The bolts undergo heat treatment in temperature-controlled furnaces using IoT technology, with continuous, precise monitoring of critical parameters. This achieves the required hardness and toughness consistently and repeatably.
5. Final control, packaging and quality dossier
Each bolt undergoes strict final quality control of dimensions, mechanical properties and surface finish, and its traceability is documented from raw material to finished product, delivered to the customer through a quality dossier. Packaging includes thread protectors that prevent damage during transport and storage.
MODEPSA is the only bolt factory in the country with an INACAL-accredited laboratory for hardness and tensile testing, equipped with calibrated and certified instruments that back the reliability of every test.
Accessories included to the same standard
Our mill bolts come with their accessories included:
- 2H nut with nylon insert
- Cup-type steel washer
- Rubber washer
Each accessory goes through the same thorough quality control process for which MODEPSA is recognized, documented in its traceability and quality certificates.
Does your mining operation need mill bolts with documented backing? See the product page or request your quote.
