Cosa si intende per viteria e bulloneria STANDARD?
STANDARD SCREWS AND BOLTS
IIn the mechanical and industrial sector, the terms standard screws and bolts refer to fasteners such as screws, bolts, and nuts manufactured according to international technical standards such as:
• UNI (Italy)
• DIN (Germany)
• ISO (International)
• ANSI/ASME (United States)
What is meant by standard screws
Standard screws include commonly used fasteners produced in normalized dimensions, threads, materials, and strength grades.
Examples include:
• Hex head screws (e.g. ISO 4014, DIN 933)
• Socket head cap screws (e.g. UNI 5931)
• Countersunk or cylindrical head screws
• Self-tapping and self-drilling screws
What is meant by standard bolts
This refers to bolts and nuts that comply with precise standards, often supplied together as matched pairs:
• Hex head bolts (e.g. DIN 931, DIN 933)
• Hex nuts (e.g. DIN 934)
Cosa si intende per viteria e bulloneria SPECIALE?
SPECIAL SCREWS AND BOLTS
Special screws and bolts are custom-made fastening components — non-standard parts that do not conform to common international norms such as UNI, DIN, ISO, or ANSI.
They are designed for specific or high-demand industrial applications where standard fasteners do not meet the required technical specifications. These parts are often produced based on customer drawings or technical specifications defined during the design phase.
Main features of special fasteners
• Customized geometries (heads, lengths, non-standard threads)
• Special materials (alloy steels, stainless steel, high-performance alloys, titanium)
• Specific surface treatments (zinc plating, nickel plating, black oxide, anti-corrosion coatings)
• Superior mechanical strength, sealing performance, and durability
Cos'è una vite rettificata?
GROUND SCREWS
A ground screw (or precision screw) is a high-accuracy screw whose thread is finished by grinding — a mechanical finishing process that ensures extremely tight tolerances, smooth surfaces, and maximum dimensional precision.
These screws are used in applications that require:
• High smoothness and precision of movement
• No play or backlash
• Maximum mechanical reliability
Typical applications:
Linear motion systems, machine tools, robotics, industrial automation, precision instruments.
Cosa si intende per rondella antisvitamento?
ANTI-LOOSENING WASHERS
An anti-loosening washer is a mechanical fastening element designed to prevent the unintentional loosening of screws, bolts, or nuts caused by vibration, impact, or dynamic loads.
Used in combination with a screw or bolt, it increases joint security and mechanical resistance, ensuring fastening reliability even under critical operating conditions.
Nel settore della viteria e della bulloneria, cosa significano le sigle 8.8, 10.9 e 12.9?
STRENGTH CLASSES 8.8, 10.9, 12.9
In the fastener industry, the markings 8.8, 10.9, and 12.9 indicate the mechanical strength class of high-strength steel screws and bolts.
Defined by ISO 898-1, these numbers express two main parameters:
• Tensile strength (Rm) — in MPa
• Yield strength (Re) — percentage of Rm
| Strength Class | Tensile Strength (Rm) | Yield Strength (Re) | Typical Applications |
| 8.8 | 800 MPa | 640 MPa (80%) | General construction, carpentry |
| 10.9 | 1000 MPa | 900 MPa (90%) | Automotive, industrial plants |
| 12.9 | 1200 MPa | 1080 MPa (90%) | Machine tools, aerospace |
Cosa sono le SPINE e quali caratteristiche hanno?
DOWEL PINS (SPINE)
Pins are mechanical fastening elements used to lock, align, or position two or more components precisely and securely.
They ensure alignment, positioning, and load transfer between assembled parts, preventing unwanted movement.
Main pin types
• Cylindrical pins – Smooth surface, used for precise alignment and as fastening dowels.
• Spring pins (elastic pins) – Made of spring steel with a longitudinal slot; provide flexibility and secure retention.
• Taper pins – Truncated-cone shape for press fit; ensure stable locking and torque transmission.
• Double-head pins – Two protruding ends for easy extraction.
• Wedge pins – Triangular or wedge-shaped for high-hold fastening and precision adjustments.
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Cos’è un PPAP e quale la funzione?
WHAT IS PPAP AND WHAT IS ITS PURPOSE?
PPAP (Production Part Approval Process) is a standardized procedure mainly used in the automotive and industrial sectors to certify that manufactured components meet customer technical specifications.
The PPAP ensures that a supplier can consistently produce parts that meet quality, dimensional, and material requirements.
It is a fundamental phase before starting mass production.
Main PPAP objectives
• Verify that the production process is stable and capable of producing conforming parts
• Ensure all technical, dimensional, and quality specifications are met
• Document tests, measurements, and inspections on sample parts
• Reduce risks of defects and rework during serial production
Che differenze ci sono tra PPAP e certificato 3.1?
DIFFERENCES BETWEEN PPAP AND CERTIFICATE 3.1
| Aspect | Certificate 3.1 | PPAP |
| Purpose | Material and physical conformity | Complete production process validation |
| Standard | EN 10204 Type 3.1 | Standard AIAG (Automotive Industry Action Group) |
| Content | Test results for chemical and mechanical properties | Full documentation: PSW, FMEA, quality checks, material tests, process flow |
| Application | All industrial sectors | Mainly automotive and high-quality industrial sectors |
| Main goal | Guarantee of material quality | Guarantee of production process quality and stability |
WHAT DOES UNBRAKO MEAN?
The name UNBRAKO originates from “Union of Brown and Koppel”, referring to the founders and the company’s technological heritage.
Founded in the 1960s, UNBRAKO has become synonymous with high-strength bolts, precision fasteners, and certified mechanical components for complex industrial applications.
Why choose UNBRAKO products?
• Global leader in high-strength fasteners
• Products compliant with the strictest ISO and DIN standards
• Expertise in special fasteners for automotive, industrial, and aerospace sectors
• Certified quality and professional technical support