Our Production Process

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Internal Tooling Warehouse

For batches starting from 5.000/10.000 parts

Almost 4.000 different parts
produced over the years
More than 2.000 complete
set of modular tools
Flexibility and
set-up speed
New vertical
storage solution

Cold Forming and Threading

Special applications are the lifeblood of our business

Cold Forming Department

View of the cold forming department at Colombo Special Fasteners, showcasing a series of advanced cold forming machines and equipment arranged in a well-organized industrial space.
Close-up of a high-performance cold forming machine in the cold forming department at Colombo Special Fasteners, highlighting the precision engineering and advanced technology used in the production process.

The cold forming department, thanks to the introduction of new-generation machines, is at the forefront and boasts a series of high-performance double-stroke (1die-2blow) and multi-station headers (4-5 stations) able to form different sizes and shapes, even the most complex.

In case the wire needs to be pre-heated before heading, machines can be equipped with external induction units.

Advanced progressive cold header at Colombo Fasteners' production facility in Cisano Bergamasco, highlighting the sophisticated equipment and efficient manufacturing processes used in fastener production.

Rolling Department

Close-up view of a state-of-the-art rolling machine in the rolling department at Colombo Special Fasteners, showcasing precision engineering and advanced machinery.
Wide-angle view of the rolling department at Colombo Special Fasteners, featuring multiple rolling and flat dies threading machines in a well-organized industrial space.

The nearby rolling department is equipped with a series of state-of-the-art rolling and flat dies threading machines that enables the realisation of various threads, including special ones, on the headed parts.

Detailed view of a rolling machine in operation at Colombo Special Fasteners, highlighting the intricate mechanics and technology used in the threading process.

Range of Product and Materials

Ø 1.8 mm – 30 mm L 5 mm – 240 mm

CARBON
STEEl

CB4FF – QST36-3 – CB10FF – CB20FF – 23MnB4 – 30MnB4 – 34Cr4 – 41Cr4 – 32CrB4 – 38NICrMo4 – 40CrMoV4-6 – 25CrMo4 – 42CrMo4

Carbon Steel

STAINLESS
STEEL

AISI 304Cu – 316Cu – 304L – 316L – Duplex

STAINLESS
STEEL

NON-FERROUS
MATERIALS

Brass alloys, (OT-63 CW508L) copper (ETP) and aluminium (AL 6061 – 6065)

NON-FERROUS
MATERIALS

Secondary Machining Operations

Versatility and speed to every customer demand, in a 4.0 approach

The new internal mechanical machining department, opened in 2017 and in continuous expansion, is equipped with new generation CNC centres, collaborative robots and machinery for carrying out secondary finishing operations such as turning, milling, threading, drilling, tapping, internal threading and grinding.
Close-up view of precision-engineered metal holed parts produced by Colombo Special Fasteners' advanced mechanical machining department, showcasing a variety of components made using CNC technology and robotic assistance. This image highlights the department's capabilities in secondary finishing operations such as turning, milling, and threading.
Close-up view of Colombo Special Fasteners' high-quality precision bolts and screws assortment in monochrome, showcasing their advanced manufacturing process and attention to detail in producing durable and precise fastening solutions.

Heat Treatments

Shared goals as a force that holds our effort

CITT trattamenti termici logo

Usmate Velate, North of Italy

The partnership following the acquisition of CITT Trattamenti Termici and the complete renovation of all the facilities in the new 4.0. plant has contributed to a substantial increase in the production capacity. Colombo Special Fasteners is therefore able to provide an even more exhaustive service in terms of offer, qualitative performance and timing.

Resistance
Classes

Resistance
Classes

  • 4.6
  • 5.6
  • 8.8
  • 10.9
  • 11.9
  • 12.9
  • 14.9

Full or partial hardening heat treatment

Full or partial hardening heat treatment

  • Casehardening
  • Carbonitriding
  • Induction hardening
  • Normalizing
  • Tempering (8.8 – 10.9 -11.9- 12.9 – 14.9 and special ranges on request)

Surface Treatments

To increase even more the performance of our parts

Surface treatments with resistance performance to RR up to 1500 hours:

• Electrolytic zink plating
• Zink flake galvanization
• Phosphate coat
• Hot galvanizing

A collection of fasteners showcasing various surface treatments to enhance resistance performance. The image includes bolts and screws with electrolytic zinc plating, zinc flake galvanization, phosphate coating, and hot galvanizing, arranged against a light grey background. Accompanying text details the resistance performance up to 1500 hours.
Display of various advanced surface-treated components by Colombo Special Fasteners, featuring innovative designs in blue and gray. On these parts have been applied protection nets to enhance performance, demonstrating CSF's commitment to high-quality manufacturing and technological advancement in fastener solutions.
A variety of special fasteners featuring thread lock technology. The image displays an assortment of bolts and screws with blue thread lock patches, arranged on a light grey background. These fasteners are designed to prevent loosening under vibration and torque.

Application of Thread Lockers

In order to prevent the loosening and corrosion of threaded parts, different types of thread lockers can be applied depending on the usage requirements.