Screws and nuts in Titanium and Ergal

 

titanium screws

Screws, nuts and bolts in all aerospace Titanium and Aluminum alloys

Our screws are available in TITANIUM DEGREE 5 Ti 6Al 4V and TITANIUM DEGREE 2 ASTM.
It can be used in the following sectors:

Titanium is a metal element, which is well known for its resistance to corrosion and for its high ratio resistance/weight. It is light, hard, with a low density.

Titanium is resistant like steel, but 40% lighter, weighs 60% more than aluminum, but twice as resistant. These features make titanium very resistant to the usual fatigue form of metals.  

TYPICAL ANALYSIS GRADE 2 GRADE 5
C (carbon) 0,08 0,08
N (Nitrogen) 0,06 0,07
H (Hydrogen) 0,0125 0,0125
O (Oxygen) 0,25 0,20
Fe (Iron) 0,25 0,30
Al (alluminium) - da 5 a 6,5
V (vanadium) - da 3,5 a 4,5
Ti (titanium) - -

 

We also provide for Aluminium alloy 7075, trade name ERGAL: an alloy of aluminium and zinc.

Ergal has the characteristic of being the lightest aluminium alloy and, from a mechanical point of view, more resistant to clashes, efforts, weight and to twisting.

It is also the alluminium alloy less subject to "thermal expansion" and, therefore, most suitable to be used outdoors, as it tolerates in a better way temperature changes (hot and cold). For example, it is used in the nautical and sports sectors (cars, motorcycles, bicycles).

In recent years, ergal nuts and bolts are often used in design elements as well: for example in furniture ( chairs..) and even on accessories (lighting elements..), indoors and outdoors.

ERGAL may be anodized in various colours.

Anodization, also known as anodic oxidation,is a non-spontaneous electrochemical process, by means of which a protection layer of aluminum oxide forms on the treated material, protecting it from corrosion.

According to needs, it is possible to pass to the fixing phase, keeping the colour of aluminium or, since the surface has unlimited open holes, it is in the ideal condition to receive any type of colouring.

The purpose of the treatment is to:

• Improve corrosion resistance of the material;
• Increase surface hardness;
• Increase wear and tear and abrasion resistance;
• Provide for a moderate thermal insulation;
• Improve other features such as glueing

We are also able to provide for custom-manufactured screws. Relating to Ergal screws, colouring must be requested during the offer.

Titanium screws for motorcycles

TITANIUM - features and properties

One of the most interesting features of titanium is its high melting point of 3135 F (1725 C). This melting point is about 400 C above the melting point of steel and about 2000 F above the one of aluminum.

Titanium can be passivated and, therefore, presents a high degree of immunity to the attack of acid minerals and chlorides. Its excellent resistance to corrosion and biocompatibility, together with its resistance make titanium and its alloys useful in chemical and petrochemical applications, in marine environments and biomedical applications.

Titanium features a combination of high resistance, toughness, stiffness, low density and good resistance to corrosion, provided by various titanium alloys at very low or high temperatures, allowing to save weight in aerospace structures as well as in other high performance applications.

ERGAL - features and properties

Physical features of Ergal

Linear thermal expansion coefficient of ergal:

Temperature C 10-6 mm/mm C
-50>20 21,8
20>100 23,6
100>200 24,5
200>300  

 

Alloy Si Fe Cu Mn Mg Cr Zn Ti
EN-AW-7075 0.40 0.50 1.2 0.30 2.1 0,18 5.1 0.20
      2.0   2.9 0,28 6.1  

The properties of aluminum are:

• Low unit weight, equal to one third ofnthe one of steel or of copper alloys
• High resistance to corrosion
• High heat and electric conductivity
• Non-toxicity
• High plasticity
• Excellent flexibility and malleability
• Low radiant power
• Excellent weldability (gas, electric arc, resistance)

Relating to metal alloys made of aluminum, the peculiarities in common for all are:

• Low melting temperature between 510 and 650C
• Low unit weight, included between 2,66 and 2,85 gr/cm3
• Very high electric and heat conductivity
• Aluminum content higher than 95%

Series 7000: (trade name Ergal)

The main element of e alloy is Zinc. Generally, binary alloys Al-Zn are not used, but Al-Zn-Mg alloys are preferred. They are thermal treatment alloys; these alloys develop the highest mechanical features among aluminum alloys; Zinc increases the resistance and the hardness, besides promoting self-hardening of the alloy.

The alloys Al-Zn-Mg, thermally treated, have the highest traction resistance of all aluminum alloys. The alloys, featuring the highest mechanical characteristics, may be sensitive to stress corrosion cracking; that is why some specific "stabilizing" treatments have been developed. They are used for aeronautical structures and for transportation means, and, in general, for very stressed parts.