Technical Specification

WROUGHT ALLOYS

The International Alloy Designation System is the most widely accepted naming scheme for wrought alloys. Each alloy is given a four-digit number where the first digit indicates the major alloying elements.

Wrought Alloys: Equivalent Designations

INDIA		U.S.A	BRITAIN	CANADA	GERMANY	RUSSIA	I.S.O.	FRENCH
NEW I.S.	OLD I.S.	(A.A.)	(B.S.)	-	(DIN)	-	-	ND
19501	1E	1050(E.C)	1E	C 1 S	E-AI 99.5	–	–	–
19500	1B	1050	1B	15	A-99.5	–	AL-99.5	1050A
19600	–	1060	–	–	–	–	–	–
19700	–	1070	–	–	Al-99.7	–	Al-99.7	–
19800	1A	1080	1A	–	–	–	Al-99.8	–
19000	1C	1100	1C	2S	A1-99.0	AD	Al-99.0	1200
–	–	2011	FC1	28S	Al-Cu-Bi-Pb	–	Al-Cu-6Bi Pb	2011
24345	H15	2014	H15	B26S	Al-Cu-Si	AK	–	–
24534	H14	2017	H14	17S/16S	–	D1	Al-Cu-4Mg Si	–
–	–	2024	–	24S	Al-Cu-Mg.2	–	Al-Cu-4Mg 1	2024
31000	N3	3003	N3	3S	Al-Mn	A-Mn	Al-Mn 1	3003
43000	N21	4043	N21	33S	AI-Si-5	AK	Al-Si5	4043
46000	N2	4047	N2	35S	–	–	–	–
51000	–	5005	–	B57S	–	–	AI-Mg-1	–
52000	N4	5052	N4	M57S	Al-Mg.2	A-Mg	Al-Mg-2.5	5051
53000	N5	5086	N5	54S	–	A.Mg-3	AI-Mg-4	–
54300	N8	5083	N8	D54S	Al-Mg-4.5 Mn	–	Al-Mg-4.5 Mn	5083
55000	N6	5056	N6	A56S	Al-Mg.5	–	Al-Mg.5	5356
65032	H2O	6061	H2O	65S	Al-Mg-Si Cu	–	AI-Mg-1Si Cu	–
63400	H9	6063	H9	50S	Al-Mg-Si 0.5	–	Al-Mg-Si	–
64430	H30	6351	H30	B51S	Al-Mg-Si 1	AV	AI-Si-1 Mg	6081
64423	H11	6066	H11	C625	–	–	–	–
62400	–	6005	–	C515	–	–	–	–
63401	91E	6101	91E	D5OS	E.AI.Mg.Si 0.5	–	–	–
64401	–	6201	–	–	–	–	–	–
74530	–	7039	–	D74S	Al-Zn-Mg. 1	–	–	3004
–	–	7075	DTD	75S	Al-Zn-Mg Cu 1.5	–	Al-Zn 6 Mg Cu	7075
			5124

Wrought Alloys: Chemical Composition Limits (Percent)

Alloy		Equivalent	Copper		Magnesium		Silicon		Iron	Manganese		* Others	Remarks
(ISS)		Alloy (AA)	-		-		-		-	-		(Total)	-
Old	New	U.S.A.	Min	Max	Min	Max	Min	Max	Max	Min	Max	Max
1 C	19000	1100	–	0.10	–	–	–	0.5	0.6	–	0.1	0.1	Aluminium 99.0%Min
		1200	–	0.05	–	–	Si+Fe1.0		1.0	–	0.05	0.1	Aluminium 99.0%Min
1 B	19500	1050	–	0.05	–	–	–	0.25	0.4	–	0.05	0.1	Aluminium 99.5%Min
1E	19501	–	–	0.04	–	–	–	0.15	0.35	–	0.03	0.1	Aluminium 99.5%Min
–	–	1350	–	0.05	–	–	–	0.10	0.40	–	0.01	0.1	Aluminium 99.5%Min
–	19600	1060	–	0.05	–	–	–	0.25	0.35	–	0.03	0.1	Aluminium 99.6%Min
–	19700	1070		0.03	–	–	–	0.2	0.25	–	0.03	0.1	Aluminium 99.7%Min
H15	24345	2014	3.8	5.0	0.2	0.8	0.5	1.2	0.7	0.3	1.2	0.5	–
H14	24534	2017	3.5	4.7	0.4	1.2	0.2	0.7	0.7	0.4	1.2	0.5	–
N3	31000	3003	–	0.1	–	0.1	–	0.6	0.7	1.0	1.5	0.4	–
N21	43000	4043	–	0.1	–	0.2	4.5	6.0	0.6	–	0.5	0.2	–
N2	46000	4047	–	0.1	–	0.2	10.0	13.0	0.6	–	0.5	0.2	–
N4	52000	5052	–	0.1	1.7	2.6	–	0.6	0.5	–	0.5	0.4	Cr + Mn = 0.5
N5	53000	5086	–	0.1	2.8	4.0	–	0.6	0.5	–	0.5	0.4	Cr + Mn = 0.5
N6	55000	5056	–	0.1	4.5	5.6	–	0.6	0.7	–	0.5	0.4	Chromium upto 0.25
N8	54300	5083	–	0.1	4.0	4.9	–	0.4	0.7	0.5	1.0	0.4	Chromium upto 0.25
H2O	65032	–	0.15	0.4	0.7	1.2	0.4	0.8	0.7	0.2	0.8	0.4	Chromium upto 0.25% **Cr =0.15-0.35
%
–	–	6061	0.15	0.4	0.8	1.2	0.4	0.8	0.7	–	0.15	0.4	Chromium 0.04 to 0.35
H9	63400	6063	–	0.1	0.4	0.9	0.3	0.7	0.6	–	0.3	0.4	–
–	–	6066	0.7	1.2	0.8	1.4	0.9	1.8	0.7	0.6	1.1	0.4	–
–	64423	–	0.5	1.0	0.5	1.3	0.7	1.3	0.8	–	1.0	–	–
91E	63401	6101	–	0.05	0.4	0.9	0.3	0.7	0.5	–	0.03	0.1	–
–	64401	6201	–	0.1	0.6	0.9	0.5	0.9	0.5	–	0.03	0.1	–
H30	64430	6351	–	0.1	0.4	1.2	0.6	1.3	0.6	0.4	1.0	0.3	–
		6082	–	0.1	0.6	1.2	0.7	1.3	0.5	0.4	1.0	0.3	Chromium upto 0.25
–	74530	7039	–	0.2	1.0	1.5	–	0.4	0.7	0.2	0.7	0.4	Zinc 4.0 – 5.0%
–	–	7075	1.2	2.0	2.1	2.9	–	0.5	0.5	–	0.3	0.2	Zinc (5.1-6.1)% & Chromium (0.18-0.28)%

*Titanium and/or other grain refining Elements
**Either Mn or Cr shall be present

Wrought Alloys: Mechanical Properties

Non – Heat Treatable Alloys
AIIoyAA	Oid(ISS)	New(ISS)	Temper	Ultimate Tensile Strength Kg/mm2		0.2%Proof Stress Kg/mm2	Elongation On 50mm GL
-	-	-	-	Min.	Max	-	-
1100[1 C][19000]	-	-	0	–	11.0	–	25
1050[18][19500]	-	-	0	–	10.0	–	25
1060[19600]	-	-	0	–	9.5	–	25
1070[19700]	-	-	0	–	9.5	–	25
4043[N21][43000]	-	-	0	–	13.0	–	18
4047[N2] [46000]	-	-	0	–	15.0	–	12
5052[N4] [52000]	-	-	0	–	24.5	–	18
5086[N5] [53000]	-	-	0	–	26.5	–	16
5056[N6] [55000]	-	-	0	–	34.5	–	15
5083[N8] [54300]	-	-	0	–	35.5	–	13

The temper designation follows the cast or wrought designation number with a dash, a letter, and potentially a one to three digit number, e.g. 6061-T6. The definitions for the tempers are:

F As fabricated
H Strain hardened (cold worked) with or without thermal treatment
H1 Strain hardened without thermal treatment
H2 Strain hardened and partially annealed
H3 Strain hardened and stabilized by low temperature heating Second digit

A second digit denotes the degree of hardness

HX2 = 1/4 hard
HX4 = 1/2 hard
HX6 = 3/4 hard
HX8 = full hard
HX9 = extra hard
0 Full soft (annealed)
T Heat treated to produce stable tempers
T1 Cooled from hot working and naturally aged (at room temperature)
T2 Cooled from hot working, cold-worked, and naturally aged
T3 Solution heat treated and cold worked
T4 Solution heat treated and naturally aged
T5 Cooled from hot working and artificially aged (at elevated temperature)
T51 Stress relieved by stretching
T510 No further straightening after stretching
T511 Minor straightening after stretching
T52 Stress relieved by thermal treatment
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 hot working, cold-worked, and artificially aged
W Solution heat treated only.

Note: – W is a relatively soft intermediary designation that applies after heat treat and before aging is completed. The -W condition can be extended at extremely low temperatures but not indefinitely and depending on the material will typically last no longer than 15 minutes at ambient temperature.

AIIoyAA Oid(ISS) New(ISS)	Temper	Ultimate Tensile Strength Kg/mm2		0.2%Proof Stress Kg/mm2	Elongation On 50mm GL
AIIoyAA Oid(ISS) New(ISS)	Temper	Min.	Max	0.2%Proof Stress Kg/mm2	Elongation On 50mm GL

2014 (H15) (24345)	T4(W) T6(WP)	39 49	– –	24 43	10 6
2017 (H14) (24534)	T4(W)	39	–	24	10
6063 ( H9) (65032)	T4(W) T6(WP)	14 19	– –	8 15.5	14 7
6061 (H20) (65032)	M or O T4(W) T6(WP)	– 19 28.5	15 – –	– 11.5 24	16 14 7
6351 (H30) (64430)	M or O T4(W) T6(WP)	– 19 31.5	15 – –	– 12 27.5	16 14 7
6066	O T4(W) T6(WP)	– 28 35	20.5 – –	– 17.5 31.5	16 14 7
6101 (91E) (63401)	T4(W) T6(WP)	14 20.5	– –	8 17	12 10
6201 (64401)	T4(W) T8(WDP)	16 32	– –	7 –	14 3
7039 (74530)	T4(W) T6(WP)	28 31.5	– –	23.5 26.5	7
7075	T6(WP)	54	–	46.5	6

Properties indicated herein are typical propertoes and are given for information only.However properties of all the profiles in specific alloy shall be as per I.S. Specification.

Wrought Alloys: Welding Properties

Alloy & Temper	Gas	Arc with inert Gas	Arc with inert Flux	Resist. Welding	Pressure Welding	Brazing	Soldering	-	Filler
-	-	-	-	-	-	-	Low Temp	High Temp	Metal (3) t
1050 0	A	A	A	B	A	A	A	A	1260
1100 0	A	A	A	B	A	A	A	A	1100
2014 0	D	C	C	B	C	D	D	D	4145
2017 T4	D	C	C	B	D	D	D	D	4145
T6	D	C	C	B	D	D	D	D	4145
3003 0	A	A	A	B	A	A	A	A	1100
5005 0	A	A	A	B	A	B	B	A	4043
5052 0	A	A	A	B	B	C	C	C	5356
5086 0	C	A	A	B	C	D	D	D	5356
6061 0	A	A	A	B	A	A	B	A	4043
T4	A	A	A	A	B	A	B	A	4043
T6	A	A	A	A	B	A	B	A	4043
6063 T6	A	A	A	A	B	A	B	A	4043
6101 T6	A	A	A	A	B	A	B	A	4043
6201 T81	A	A	A	A	B	A	B	A	4043
7039 T6	D	C	C	A	C	D	C	C	7039

For general purpose only. For specialised applications, e.g. pressure vessels anodised item etc., special process should be used.
Joining ratings A,B,C & D are relative in order of merit.
1. Readily weldable.
2. Special techniques and close control of procedure are required.
3. Limited weldability due to crack sensitivity, loss in strength and of loss in resistance to corrosion.
4. Not recommended.
Filler metals for general purpose only. For Specialized applications requiring high strength ductility, colour match after anodising etc.special filler metals are recommended.

Wrought Alloys: Surface Finishing (Suitability)

Alloy	Protective Anodising	Anodising & Dyeing	Bright Anodising	Plating	vitreousea immelgin
1050/1070	E	E	V	V	G
1100	V	V	G	V	G
2014/2017	M	M(D)	U	V	U
3003	G	G	M	G	V
4043	G	G(D)	U	O	G
5005	V	V	V	O	U
5052	V	V	G-V	O	U
5086/5056	V	V	G	O	U
6061	G	G]	M	O	O
6063	V	V	G-V	O	O
6066	M	M(D)	U	V	U
6101	V	V	G-V	O	O
6351	G	G	M	O	O

Excellent
Very good
Good
Moderate
Unsuitable
Only Suitable for dark colours
Modified technique is essential and some initial diffculties may occur

Wrought Alloys: Guide to Selection

Alloy	Temper	Resistence to corrosion	Workability(cold)	Machnability	Brazeability	Weldability	Commonly Available forms	indication of use
EC/1050, 1060, (1B) (19501) (19500) (19600)	F.O	A	A	D	A	A	Flats Rods, Tubes & other sections	Electrical conductors, cable produce, presting untruded anodizing quality, pen caps,piping etc.
1100(1C) (19000)	F.O	A	A	D	A	A	Flats Rods, Tubes & other sections	Packaging lightly stresses and decorative assemblies in architecture and transport, equipment for chemical, food and brewing industnes.
2014 (H 15) (24345)	T4 T6	C C	C D	B B	D D	C C	Rods & Bars	Highly stressed component of all types in aircraft, ordnance and general engineering.
2017 (H 14) (24534)	T4	C	C	B	D	C	Rods & Bars	Highly stressed parts in aircraft and other structures, screw machine products.
4043 (N 21) (43000)	F.O	A	A	D	A	A	Rods & other sections	Welding wire, architectural applications.
5005 (51000A)	F.O	A	A	D	B	A	Flats Rods, Tubes & other sections	Consumer durable with altractive anodised finish.Architecturals, electrical conductors etc.
5052 (N 4 ) (52000)	O.F	A	A	D	C	A	Flats Rods, Tubes & other sections	Structures exposed to marine atmosphere, aircraft pans, wire rope ferrules, rivet stock.
5086 (N 5) (53000)	O.F	A	A	D	D	A	Flats Rods, Tubes & other sections	Ship building and other marine applications, rivets, coinage etc.
5056 (N6) (55000)	O.F	A	A	D	D	A	Rods	Zips, Welding Rods and Rivets.
6061 (H 20) (65032)	O.F T4 T6	A A A	A C D	D C C	A A A	A A A	Flats Rods, Tubes & other sections	Heavy duty structures, building hardware, sections for bus body. truck and rail coach, furniture, nivels elc.
6063 (H9)	O.F T4 T6 T5	A A A A	A B C C	D C C C	A A A A	A A A A	Flats Rods, Tubes & other sections	Building hardware, architectural sections with good surface finish, medium strength furniture and anodized sections.
6066 (22450)	O.F T4 T6	B B B	B C C	D B B	A A A	A A A	Rods and other Solid sections	For welded structures, (extile parts, heavy duty machine parts.
6101 (91 E) (63401)	T4 T6	A A	B B	C C	A A	A A	Flats Rods, Tubes & other sections	High strength electrical busbar sections.
6201 (64401)	T4	A	A	C	A	A	Redraw Rod	Overhead conductors, ACAR and AAAC.
6351 (H 30) (64430)	O.F T4 T6	A A A	A C D	D C C	A A A	A A A	Flats Rods, Tubes & other sections	Structural and general engineering items such as rail & road transport vehicles, bridges, cranes, roof trusses, rivets etc.
7039( D74S) (74530)	O.F T4 T6	A A A	A C D	D C C	A A A	A A A	Flats Rods, Tubes & other sections	Defence structures like mobile bridges etc. Tread and chequered plates. Excelent welding property with no loss of strength in welded zone
7075 (DTD5124)	O.F T4 T6	A A A	A A D	A A A	A A A	A A A	Rods	Highly stressed structural applications.

NOTES

Relative ratings for corrosion, workability and machinability in decreasing order of merit A, B, C and D.
Weldability & brazeability ratings A, B, C and D are relative ratings defined as follows:
A.Generally weldable by the commercial procedure & methods.
B.Weldable with special technique.
C.Limited weldability due to crack sensitivity or loss in corrosion resistance and mechanical properties.
D. Generally not weldable.
Availability of other forms subject to special enquiries and methods.

STANDARD MANUFACTURING TOLERANCES

The Standard manufacturing tolerance given here are applicable to the average shapes. Wider tolerance may be required for some shapes, and closer tolerance may be possible for others. for 5052,5056,5083,5086 and high magnesium alloys, special(wider) tolerance will be applicable. Tolerances stricter than standard shall be subjected to special enquiry.

Round Bars/Rods : Diameter Tolerance

Specified Diameter mm		Class A		Tolerance (mm)	Class B
-	-	+	_	-	±
-	Upto12.0	0.03	0.07	-	0.20
Over 12.0	Upto25.0	0.05	0.10	-	0.25
Over 25.0	Upto40.0	0.07	0.13	-	0.30
Over 40.0	Upto50.0	0.13	0.13	-	0.38
Over 50.0	Upto56.0	0.15	0.15	-	0.46
Over 56.0	Upto71.0	0.2	0.20	-	0.53
Over 71.0	Upto80.0	0.25	0.25	-	0.61
Over 80.0		0.50%	0.50%	-	1%

Notes:

Class ‘A’ is for drawn rods.
Class ‘B’ is normal tolerance for extruded rods.

Solid Sections: Width Tolerance

Specified Width mm	Depth of angle or leg (in mm)
	6.5 to 16.0	16.1 to 32.0	32.1 to 64.0	64.1 to 150.0
	Width Tolerance mm ±
Up to 6.0	0.30	–	–	–
6.1 to 12.0	0.35	0.40	0.45	–
12.1 to 20.0	0.40	0.45	0.50	–
20.1 to 25.0	0.45	0.50	0.55	0.65
25.1 to 38.0	0.50	0.55	0.65	0.75
38.1 to 50.0	0.60	0.70	0.80	0.90
50.1 to 100.0	0.80	0.90	1.20	1.50
100.1 to 150.0	1.10	1.30	1.70	2.00
150.1 to 200.0	1.50	1.60	2.10	2.50
200.1 to 250.0	1.70	1.90	2.70	3.00

Notes:

Tolerance on internal or external gap (between flanges or legs) can be guaranteed depending on requirements.These tolerance are applicable to channels, l-beam and other section where there are both open and closed ends.

Specified Width or Width across flats (in mm)	Tolerance mm ±
4	0.18
5	0.20
6	0.20
8	0.23
10	0.23
12	0.25
16	0.28
20	0.30
25	0.30
32	0.38
40	0.46
50	0.46
60	0.53
80	0.69
100	0.69
120	0.76
160	1.02
20	1.14
250	1.40

Notes:

For intermediate size, take tolerance for the next higher value.

Solid Sections : Thickness Tolerance

Specified** Thickness	Width of Section (in mm)												-	-	-
mm	12	16	20	25	32	40	50	63	80	100	125	160	200	250	320
1.2	0.20	0.20	0.20	0.20	0.20	*	*	*	*	*	*	*	*	*	*
1.6	0.18	0.20	0.20	0.20	0.20	*	*	*	*	*	*	*	*	*	*
2.0	0.18	0.20	0.20	0.20	0.20	0.23	0.25	0.28	0.30	0.33	0.36	0.38	0.41	0.46	*
2.5	0.18	0.20	0.20	0.20	0.20	0.23	0.25	0.28	0.30	0.33	0.36	0.38	0.41	0.46	*
3.2	0.18	0.20	0.20	0.20	0.23	0.25	0.28	0.30	0.33	0.36	0.38	0.41	0.43	0.48	*
4.0	0.20	0.23	0.23	0.23	0.25	0.28	0.30	0.33	0.36	0.38	0.43	0.43	0.46	0.51	*
5.0	0.20	0.23	0.23	0.23	0.25	0.28	0.30	0.33	0.36	0.38	0.41	0.43	0.46	0.51	*
6.0	0.20	0.23	0.23	0.23	0.25	0.28	0.30	0.33	0.36	0.41	0.46	0.51	0.56	0.66	*
8.0	0.23	0.25	0.25	0.25	0.28	0.30	0.33	0.36	0.38	0.43	0.48	0.53	0.58	0.71	*
10.0	0.23	0.25	0.25	0.25	0.28	0.30	0.33	0.36	0.38	0.43	0.48	0.53	0.58	0.71	*
12.0	0.25	0.28	0.28	0.28	0.30	0.33	0.36	0.38	0.41	0.46	0.48	0.53	0.58	0.74	0.97
16.0	0.28	0.30	0.30	0.30	0.33	0.36	0.38	0.41	0.43	0.48	0.51	0.56	0.61	0.76	1.02
20.0	–	0.30	0.30	0.30	0.36	0.38	0.41	0.43	0.46	0.51	0.53	0.61	0.69	0.79	1.04
25.0	–	0.30	0.30	0.30	0.36	0.38	0.41	0.43	0.46	0.51	0.53	0.61	0.69	0.79	1.04
32.0	–	–	–	–	0.38	0.41	0.43	0.46	0.48	0.53	0.56	0.66	0.74	–	–
40.0	–	–	–	–	–	0.46	.0.48	0.51	0.53	0.56	0.61	0.71	0.79	–	–
50.0	–	–	–	–	–	–	0.53	0.56	0.58	0.61	0.66	0.76	0.84	–	–
63.0	–	–	–	–	–	–	–	0.61	0.64	0.66	0.71	0.81	0.89	–	–
80.0	–	–	–	–	–	–	–	–	0.69	0.71	0.74	0.86	0.94	–	–
100.0	–	–	–	–	–	–	–	–	–	0.76	0.79	0.91	0.99	–	–
125.0	–	–	–	–	–	–	–	–	–	–	0.89	0.97	1.04	–	–

* To be regarded as special sections.
** For intermediate size, take tolerance for the next higher value.

Round Tubes : Wall Thickness Tolerance

Specified Wall Thickness (mm)	Tolerane (mm)	-
	Class 1 ±	Class 2 ±
Up to 1.2	0.30	–
1.60	0.30	–
1.80	0.30	–
2.00	0.30.	–
2.24	0.30	–
2.50	0.33	–
2.80	0.36	–
3.15	0.40	0.90
3.55	0.43	0.94
4.00	0.48	0.97
4.50	0.51	1.02
5.00	0.56	1.07
5.50	0.61	1.12
3.30	0.67	1.18
7.10	0.76	1.27
8.00	0.97	1.47
9.00	1.10	1.60
10.00	1.22	1.73
11.20	1.28	1.79
12.50	1.35	1.85

Notes:

Tubes with wall thickness intermediate between standard sizes will have tolerane of the next higher thickness.
Tolerane on standard wall thickness above 12.50 mm may be as agreed to between the purchaser and the supplier.
For Al-Zn-Mg, Al-Mg and Al-Cu alloys, class 2 tolerances shall apply.
For Al, Al-Mn and Al-Mg-Si alloys, class 1 tolerances shall apply.

Round Tubes: Diameter Tolerance

Specified Diameter Outside or inside mm	Diameter Tolerance (mm ±)	Ovality (mm ±)
From 9 upto 18	0.25	0.50
Over 18 upto 30	0.3	0.60
Over 30 upto 40	0.36	0.80
Over 40 upto 50	0.45	0.90
Over 50 upto 60	0.54	1.00
Over 60 upto 80	0.6	1.30
Over 80	1% of dia	2.5% of dia

Notes :

When outside diameter, inside diameter and wall thickness are all specified, standard tolerances are applicable to any two of these dimensions, but not to all three.
Mean diameter is the average of two diameter measurement taken at right angles to each other at any point along the length in other words, mean diameter is 1/2 (AA + BB).
Ovalness tolerance is not applicable for annealed temper or if the wall thickness is less than 2.5% of the outside diameter.

Hollow Sections: Wall Thickness Tolerance

Wall Thickness (mm)		Width or overall dimensions (mm)
		Over	10	20	30	40	50	60	80	100	120	140	160	180	200	225
		Up to	20	33	40	50	60	80	100	120	140	160	180	200	225	250
Class B
Over	up to
1	1.5		0.28	0.28	0.28	0.3	–	–	–	–	–	–	–	–	–	–
1.5	2		0.3	0.33	0.33	0.36	–	–	–	–	–	–	–	–	–	–
2	2.5		0.33	0.33	0.36	0.38	0.43	0.46	–	–	–	–	–	–	–	–
2.5	3		0.41	0.43	0.46	0.48	0.51	0.53	0.56	–	–	–	–	–	–	–
3	4		0.53	0.56	0.58	0.61	0.64	0.66	0.69	0.71	0.74	–	–	–	–	–
4	5		–	0.71	0.74	0.76	0.79	0.81	0.84	0.86	0.89	0.91	0.94	1.02	–	–
5	6		–	–	0.97	0.99	1.02	1.04	1.07	1.09	1.12	1.14	1.17	1.19	1.22	1.24
6	8		–	–	–	1.22	1.24	1.27	1.3	1.32	1.35	1.37	1.4	1.42	1.45	1.47
8	10		–	–	–	–	1.47	1.5	1.52	1.55	1.57	1.6	1.63	1.65	1.68	1.7
10	12		–	–	–	–	1.73	1.75	1.78	1.8	1.83	1.85	1.88	1.9	1.93	1.96
12	16		–	–	–	–	–	1.98	2	2.03	2.06	2.08	2.11	2.13	2.16	2.18
16	2		–	–	–	–	–	–	2.24	2.26	2.29	2.31	2.34	2.36	2.39	2.41
20	25		–	–	–	–	–	–	2.49	2.51	2.54	2.57	2.59	2.62	2.64	2.67
Class A
1.5	2		0.28	0.3	0.3	0.33	–	–	–	–	–	–	–	–	–	–
2	2.5		0.3	0.3	0.33	0.36	0.41	0.43	–	–	–	–	–	–	–	–
2.5	3		0.3	0.3	0.36	0.38	0.43	0.46	0.51	–	–	–	–	–	–	–
3	4		0.33	0.36	0.38	0.41	0.46	0.51	0.56	0.61	0.69	–	–	–	–	–
4	5		–	0.41	0.43	0.46	0.51	0.56	0.61	0.69	0.76	0.84	0.91	0.99	–	–
5	6		–	–	0.46	0.51	0.56	0.61	0.69	0.76	0.84	0.91	0.99	1.07	–	–
6	8		–	–	–	0.56	0.61	0.69	0.76	0.84	0.91	0.99	1.07	1.14	–	–
8	10		–	–	–	–	0.69	0.76	0.84	0.91	0.99	1.07	1.14	1.22	–	–
10	12		–	–	–	–	0.76	0.84	0.94	0.99	1.07	1.14	1.22	1.3	–	–
12	16		–	–	–	–	–	0.94	0.99	1.07	1.14	1.22	1.3	1.37	–	–
16	20		–	–	–	–	–	–	1.07	1.14	1.22	1.3	1.37	1.45	–	–
20	25		–	–	–	–	–	–	1.14	1.22	1.3	1.37	1.45	1.52	–	–

Notes:

These tolerances are applicable to hollow sections other than round tubes.
For non-heat-treatable alloys, these tolerances are applicable when wall thickness of these section is atlease 1.5mm or 1/32 of overall width, whichever is greater. For heat-treated alloys, these tolerances are applicable when wall thickness is atleast 1.5mm or 1/24 of overall width, whichever is greater.
Unless otherwise specified, class B tolerances will be applicable.
For high-magnesium non-heat-treatable alloys (5052,5056,5083,5086), an extra tolerance of 50% shall be allowed.

Hollow Sections: Width Tolerance

Specified Width or Width across flats (mm)		Width tolerance ± when measured
-	-	at corners	at centre
over	upto	-	-
10	20	0.3	0.46
20	30	0.38	0.55
30	40	0.45	0.65
40	50	0.52	0.8
50	60	0.6	1
60	80	0.7	1.2
80	100	0.8	1.4
100	120	0.89	1.65
120	140	1.02	1.9
140	160	1.14	2.2
160	180	1.27	2.45
180	200	1.4	2.7

Notes:

These tolerances are applicable to hollow sections other than round tubes.
For non-heat-treatable alloys, these tolerances are applicable when wall thickness of the section is at least 1.5 mm or 1/32 of overall width, whichever is greater. For heat-treated alloys, these tolerances are applicable when wall thickness is at least 1.5mm or 1/24 of overall width, whichever is greater.
Nor high-magestun non-heat-treatable alloys (5052, 5056, 5033, 5086), an extra tolerance of 50% shall be allowed.

Solids & Hollow Sections: Angularity Tolerance
Specified thickness of thinning leg mm Allowable deviation from specified angle degrees

Upto 5 2

Over 5 upto 19 1.5

over 19 1
Notes:
- Angles should be measured at the extremities of the section. If the cases of the sections are conplex, the angles should be measured by balancing the arms of the protractor at the middle of the section.
Solid & hollow Sections: Flatness Tolerance
width of section (mm) A Tolerance B

over upto & including ±mm

– 25 0.18

25 38 0.25

38 50 0.3

50 – .3 plus .13 mm for every 25 mm of idth
Example:

The tolerances for a solid section of 150 mm width shall be as follows:
±(0.30+ 0.13 x 150/25 = (0.30 ± 0.13 x 6) = ± 1.08 mm

Notes:
1. flatness tolerances is measured of concavity or convexity
2. while measuring convexity, the striaght edge shall be balanced at the middle of the section.
Solid & Hollow Section: Twist & Straightness Tolerance
Diameter of circumscribing cirle mm allowable deviation from straightess mm per metre or length

Upto & including 25 2.1

over 25 1.7
Notes:
1. Tolerance values are same for straightness and twist.
2. Twist is normally measured by placing the extruded section on a flat surface and measuring the maximum distance at any point along its length between the bottom surface of the section and the flat surface. From this measurement, the deviation from true straightness of the section is subtracted. The reminder is the twist. To convert the standard twist tolerance to an equivalent inner value, the tangent of the standard tolerance is multiplied by the width of the surface of the section that is one of the flat surface.
Solid & Hollow Section : Cut Length Tolerance

Width or diameter mm length tolerance mm±

upto 50 6

50.1 to 100 8

100.1- 150 10

150.1 to above 12

Specified thickness of thinning leg mm	Allowable deviation from specified angle degrees
Upto 5	2
Over 5 upto 19	1.5
over 19	1

width of section (mm) A		Tolerance B
over	upto & including	±mm

–	25	0.18
25	38	0.25
38	50	0.3
50	–	.3 plus .13 mm for every 25 mm of idth

Diameter of circumscribing cirle mm	allowable deviation from straightess mm per metre or length

Upto & including 25	2.1
over 25	1.7

Width or diameter mm	length tolerance mm±
upto 50	6
50.1 to 100	8
100.1- 150	10
150.1 to above	12

TECHNICAL SPECIFICATION

WROUGHT ALLOYS

STANDARD MANUFACTURING TOLERANCES

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