Aircraft Extrusion Company
180 Erma Court, Unit 180
Chico, CA 95928, USA
Phone: +1 (323) 813 4105
Email: info@aircraftextrusion.com

Aluminum Temper and Alloy Designation

Information on Hard Alloy Tempers.

Aircraft Extrusion Co is specializes in hard alloy profiles and tube. Unlike commercial alloys, it is important to understand the different types of alloys and the temper designations. Providing just the part numbers results in delays, part numbers must always be accompanied by the alloy and temper. There are a few exceptions, like Lockheed, where the alloy/temper is also called out on the part number and print.


Aluminum Alloy Designations

The aluminum industry uses a four-digit index system for the designation of its wrought aluminum alloys.

As outlined below, the first digit indicates the alloy group according to the major alloying elements.

Aircraft grades we stock:
2024
6061
7075

1000 Series Aluminum (Example 1001-H13)

In this group, minimum aluminum content is 99%, and there is no major alloying element.

The second digit indicates modifications in impurity limits. If the second digit is zero, there is no special control on individual impurities. Digits 1 through 9, which are assigned consecutively as needed, indicate special control of one or more individual impurities.

The last two digits indicate specific minimum aluminum content. Although the absolute minimum aluminum content in this group is 99%, the minimum for certain grades is higher than 99%, and the last two digits represent the hundredths of a percent over 99.

Thus, 1030 would indicate 99.30% minimum aluminum, without special control on individual impurities. The designations 1130, 1230, 1330, etc., indicate the same purity with special control on one or more impurities. Likewise, 1100 indicates minimum aluminum content of 99.00% with individual impurity control.

Aluminum Profile Data References.

Aircraft Extrusion Company manufactures and supplies aircraft extrusions to tolerance specification Fed-Std-245 and ANSI H 35.2. Call us if you have any question or concerns regarding mill tolerances. Copies of aluminum profile specifications can be found at visiting the Aluminum and Standards Federation bookstore


2xxx through 9xxx Series

The major alloying elements are indicated by the first digit, as follows:


Copper Manganese Silicon Magnesium Magnesium and Silicon Zinc Other Element Unused Series
2xxx 3xxx 4xxx 5xxx 6xxx 7xxx 8xxx 9xxx
  • 2xxx . . . . . . . . . . . . . . . . . . . Copper
  • 3xxx . . . . . . . . . . . . . . . . . . . Manganese
  • 4xxx . . . . . . . . . . . . . . . . . . . Silicon
  • 5xxx . . . . . . . . . . . . . . . . . . . Magnesium
  • 6xxx . . . . . . . . . . . . . . . . . . . Magnesium and Silicon
  • 7xxx . . . . . . . . . . . . . . . . . . . Zinc
  • 8xxx . . . . . . . . . . . . . . . . . . . Other Element
  • 9xxx . . . . . . . . . . . . . . . . . . . Unused Series

The second digit indicates alloy modification. If the second digit is zero, it indicates the original alloy; digits 1 through 9, which are assigned consecutively, indicate alloy modifications. The last two digits have no special significance, serving only to identify the different alloys in the group.


Experimental Alloys

Experimental alloys are designated according to the four-digit system, but they are prefixed by the letter X. The prefix is dropped when the alloy becomes standard. During development, and before they are designated as experimental, new alloys are identified by serial numbers assigned by their originators. Use of the serial number is discontinued when the X number is assigned.



Aluminum Temper Designations

The temper designation system used for all forms, except ingot, of aluminum and its alloys, is based on the sequence of basic treatments used to produce the various tempers.

The basic temper designation consists of a letter, and subdivisions of the basic temper are indicated by one or more digits following the letter.


Basic Temper Designations

F O H W T
As Fabricated. Annealed. Strain Hardened. Solution Heat Treated. Thermally Treated -- to produce a stable temper other than those listed.
  • F -- As Fabricated.
  • O -- Annealed.
  • H -- Strain Hardened.
  • W -- Solution Heat Treated.
  • T -- Thermally Treated -- to produce a stable temper other than those listed.

SUBDIVISIONS OF H TEMPER


H1Strain hardened only.
H2Strain hardened, then partially annealed.
H3Strain hardened, then stabilized.
  • H1 -- Strain hardened only.
  • H2 -- Strain hardened, then partially annealed.
  • H3 -- Strain hardened, then stabilized.

The degree of strain hardening is indicated by a second digit following one of the above designations.



21/4 hard (tensile strength midway between 0 and 4).
41/2 hard (tensile strength midway between 0 and 8).
63/4 hard (tensile strength midway between 4 and 8).
8full hard (tensile strength achieved by 75% cold reduction after anneal).
9extra hard (minimum tensile 2.0 ksi higher than 8).
  • 2 -- 1/4 hard (tensile strength midway between 0 and 4).
  • 4 -- 1/2 hard (tensile strength midway between 0 and 8).
  • 6 -- 3/4 hard (tensile strength midway between 4 and 8).
  • 8 -- full hard (tensile strength achieved by 75% cold reduction after anneal).
  • 9 -- extra hard (minimum tensile 2.0 ksi higher than 8).

A third digit may be used to indicate a variation of a two digit number.


SUBDIVISIONS OF T TEMPER


T1Cooled from an elevated temperature shaping process and naturally aged.
T2Annealed.
T3Solution heat treated and cold worked.
T4Solution heat treated and naturally aged.
T5Cooled from an elevated temperature shaping process and artificially aged.
T6Solution heat treated and artificially aged.
T7Solution heat treated and stabilized.
T8Solution heat treated, cold worked, and artificially aged.
T9Solution heat treated, artificially aged, and cold worked.
T10Cooled from an elevated temperature shaping process, artificially aged and cold worked.
  • T1 -- Cooled from an elevated temperature shaping process and naturally aged.
  • T2 -- Annealed.
  • T3 -- Solution heat treated and cold worked.
  • T4 -- Solution heat treated and naturally aged.
  • T5 -- Cooled from an elevated temperature shaping process and artificially aged.
  • T6 -- Solution heat treated and artificially aged.
  • T7 -- Solution heat treated and stabilized.
  • T8 -- Solution heat treated, cold worked, and artificially aged.
  • T9 -- Solution heat treated, artificially aged, and cold worked.
  • T10 -- Cooled from an elevated temperature shaping process, artificially aged and cold worked.

Additional digits are used to designate stress relieving:

T51Stress relieving by stretching.
T52Stress relieving by compressing.
  • T51 -- Stress relieving by stretching.
  • T52 -- Stress relieving by compressing.

T510 designates products that receive no further straightening after stretching, and T511 designates products that receive minor straightening in order to comply with standard tolerances.



All gauges conform to NIST and meets requirements for MIL-STD-45662A, ANSI/NCSL Z450-1-1994 and ISO 10012, ISO/IEC 17025.

Aircraft Extrusion Co calibrates all gauges manually using certified calibration blocks. Gauges are identified with last & next calibration date.

Our Capabilities


Custom Design

We work with you to develop the most cost-effective and optimal design for your product with our design engineers and with custom-made dies.


Rolled Extrusions

New advanced equipement and design development aircraft extrusion company can now offer rolled extrusions.



CNC Machining

CNC Milling up to 4ft x 12ft parts, including seat tracks and secondary oporations aluminum profiles in 7075 and 2024



Seat Tracks

Standard and none-standard types of seat tracks in stock. We also provide milling services for the round slots on the tracks.



Roll-Form Stringers

A great selections of formed angles, channels, hats and tee's in both 2024 Clad and 7075 Clad. In addition, we also have forming capabilities


Cutting

We cut to size 7075 and 2024 extruded profiles, sheet, plate and form section. In-house cutting ops help reduce time, cost and shipping weights

Some of Our Clients