FAA Advisory Circular 43.13-1B
Acceptable Methods, Techniques, and Practices
Aircraft Inspection and Repair
AC 43.13-1B | 4. Metal Structure, Welding, and Brazing | 1. Identification of Metals | 4-4. Identification of Aluminum
AC 43.13-1B CHG 1
9/27/01
TABLE 4-4. Basic temper designations and subdivisions from aluminum alloys.
NON HEAT-TREATABLE ALLOYS
Temper
Designation
Definition
-0
Annealed recrystallized (wrought products only)
applies to softest temper of wrought products.
-H1
Strain-hardened only. Applies to products which
are strain-hardened to obtain the desired strength
without supplementary thermal treatment.
-H12
Strain-hardened one-quarter-hard temper.
-H14
Strain-hardened half-hard temper.
-H16
Strain-hardened three-quarters-hard temper.
-H18
-H2
-H22
-H24
-H26
Strain-hardened full-hard temper.
Strain-hardened and then partially annealed. Ap-
plies to products which are strain-hardened more
than the desired final amount and then reduced in
strength to the desired level by partial annealing.
Strain-hardened and partially annealed to
one-quarter-hard temper.
Strain-hardened and partially annealed to half-hard
temper.
Strain-hardened and partially annealed to
three-quarters-hard temper.
-H28
Strain-hardened and partially annealed to full-hard
temper.
-H3
-H32
-H34
-H36
-H38
-H112
-F
Strain-hardened and then stabilized. Applies to
products which are strain-hardened and then sta-
bilized by a low temperature heating to slightly
lower their strength and increase
ductility.
Strain-hardened and then stabilized. Final temper
is one-quarter hard.
Strain-hardened and then stabilized. Final temper
is one-half hard.
Strain-hardened and then stabilized. Final temper
is three-quarters hard.
Strain-hardened and then stabilized. Final temper
is full-hard.
As fabricated; with specified mechanical property
limits.
For wrought alloys; as fabricated. No mechanical
properties limits. For cast alloys; as cast.
HEAT-TREATABLE ALLOYS
Temper
Designation
Definition
-0
Annealed recrystallized (wrought products only)
applies to softest temper of wrought products.
-T1
Cooled from an elevated temperature shaping
process (such as extrusion or casting) and natu-
rally aged to a substantially stable condition.
-T2
Annealed (castings only).
-T3
Solution heat-treated and cold-worked by the
flattening or straightening operation.
-T36
Solution heat-treated and cold-worked by reduc-
tion of 6 percent
-T4
Solution heat-treated.
-T42
Solution heat-treated by the user regardless of
prior temper (applicable only to 2014 and 2024
alloys).
-T5
Artificially aged only (castings only).
-T6
Solution heat-treated and artificially aged.
-T62
-T351,
-T451,
-T3510,
-T3511,
-T4510,
-T4511.
-T651,
-T851,
-T6510,
-T8510,
-T6511,
-T8511.
-T652
-T8
-T/4
-T86
-T9
-T10
-F
Solution heat-treated and aged by user regard-
less of prior temper (applicable only to 2014 and
2024 alloys).
Solution heat-treated and stress relieved by
stretching to produce a permanent set of 1 to 3
percent, depending on the product.
Solution heat-treated, stress relieved by stretch-
ing to produce a permanent set of 1 to 3 percent,
and artificially aged.
Solution heat-treated, compressed to produce a
permanent set and then artificially aged.
Solution heat-treated, cold-worked and then arti-
ficially aged.
Solution heat-treated, cold-worked by the flatten-
ing or straightening operation, and then artificially
aged.
Solution heat-treated, cold-worked by reduction
of 6 percent, and then artificially aged.
Solution heat-treated, artificially aged and then
cold-worked.
Cooled from an elevated temperature shaping
process artificially aged and then cold-worked.
For wrought alloys; as fabricated. No mechanical
properties limits. For cast alloys; as cast.
4-5. - 4-15. [RESERVED.]
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