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Aluminium

 Made by JM

Material:
Aluminum 7075 / employment in the aircraft construction
screws and pin from high-strength aluminum alloy

Manufacturing process:

All screws are manufactured on CNC machines (except screws in the color oabic).
JM screws are therefore from outstanding quality and perfect finish.
The threads are implemented in the roll procedure.

Note please that it does not concern with nearly all other offerers CNC manufactured screws.
These screws are manufactured in mass production in the cold forging procedure (pressed).
The in such a way manufactured screws have usually a scarred and surface different of the head radius,
as it with our very favorable screws vorkommem oabic farbenen can.

Kind of the metal:

Aluminum alloy AlZn5,5MgCu, EN AW-7075 (old person designation AlZnMgCu 1.5)
characteristics AL6/abbreviation AlZn5,5MgCu (7075)/work off number 3,4365 according
to DIN 1,725 part of 1/ISO R 209

Physikalische Eigenschaften

Durchschnittliche mechanische Eigenschaften der Schrauben *)

Dichte 2,80 g/cm» Zugfestigkeit 540-600 N/qmm
Wärmeleitfähigkeit bei 20°C th qcm/ms°C 0,29 Streckgrenze 420-480 N/qmm
Spezifischer Widerstand bei 20 °C W qmm/m 0,055 Bruchdehnung 11-15 %
Linearer Ausdehnungskoeffizient zwischen 20°C und 100°C 23,5 x 10-6 Brinellhärte 154-169
Schmelzbereich 475/635°C
*) Die mechanischen Eigenschaften können sich mit dem Durchmesser ändern.

 

Zusammenstellung der Legierung AlZnMgCu 1,5

Zn Mg Cu Fe Si Mn Cr Ti Al
Mindest-% 5,1 2,1 1,2 0,18 der Rest
Höchst-% 6,1 2,9 2,0 0,5 0,4 0,2 0,35 0,2
mit Zn >2
Mg

Chemical characteristics:

The surface treatments, which receive these pins, form an effective protection against weather
and industrial influences as well as the corrosion-promoting sea-climate.
The anodized screws, which exhibit a perfect corrosion resistance under normal operating
conditions, are not attacked by most chemical products. A use during contact with strong Basen
(sodium and potassium) and concentrated acids (salt and sulfuric acid) is to be advised against however.

Attraction effectiveness:

It is particularly high, owing to the very low coefficient of friction (approx. 0.05), it permitted with low
torque data very effective tightening, without that the danger exists, the pins to destroy.
The relationship attraction strength/torque data lies between 500 and 600 kg.

Torque data:

The use of a torque wrench is recommendable. Below the maximally permissible torques:

Schraubendurchmesser

in mm

Höchstdrehmoment

in Nm

5

3

6

5,5

8

13

10

25

12

43

14

68

16

105

Wearing parts and lock nuts:
 

Each screw should be nut-laterally with a semihard, flat wearing part from AlMg3, provided.
The lock nut must correspond to the same requirements regarding its composition and its
protection as the nut/mother.
 

In order to receive the insolubility, is to be refrained from the use of a device from steel.
We recommend the use of self-locking one-piece nuts/mothers.
 


Lengthens a screw:
 

The length of a screw is always measured without the head, e.g. a screw M6x30 has a pin length of 30mm.
 

Available surfaces:
 

Colored anodizes, or anodizes and kaliumbichromatisiert and greased.
In the following colors available: oabic = yellow green irisierend red,
blue, violet, gold, silver, black and green shining anodizes
 

Note:
Screws and nuts/mothers before the assembly grease slightly (e.g. JM special screw paste) around seizing to avoid.

More sub catagories:
bolts
nuts
washers
special parts

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