Designation: A 475 03

Standard Specification for

Zinc-Coated Steel Wire Strand1

This standard is issued under the fixed designation A 475; the number immediately following the designation indicates the year of

original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A

superscript epsilon (e) indicates an editorial change since the last revision or reapproval.

This standard has been approved for use by agencies of the Department of Defense.

1. Scope*

1.1 This specification covers five grades of zinc-coated,

steel wire strand, composed of a number of round, steel wires,

with four weights of zinc coatings, suitable for use as guys,

messengers, span wires, and for similar purposes.

1.2 The five grades covered are as follows:

1.2.1 Utilities,

1.2.2 Common,

1.2.3 Siemens-Martin,

1.2.4 High-Strength, and

1.2.5 Extra High-Strength.

1.2.6 Minimum breaking strengths of strand for each grade

are described in Section 7.

1.3 The four weights of zinc coatings are: Class 1 and

Classes A, B, and C. Minimum weights of zinc coatings are

described in Section 10.

1.4 The values stated in inch-pound units are to be regarded

as the standard. The values given in brackets are for informa-

tion only.

2. Referenced Documents

2.1 ASTM Standards:

the wires in the strand, the minimum breaking strength of the

strand (see Section 7), and the class of coating (see Section 10).

4. Ordering Information

4.1 Orders for material under this specification shall include

the following information:

4.1.1 Quantity of strand in feet,

4.1.2 Nominal strand diameter, number of wires, grade, and

minimum breaking strength of strand (Section 7 and Table 1),

4.1.3 Weight (class) of zinc coating (Section 10 and Table

2),

4.1.4 Length of strand in coils or on reels (Section 18), and

4.1.5 ASTM designation and year of issue.

5. Materials and Manufacture

5.1 The base metal shall be steel made by any commercially

accepted steel making process and of such quality and purity

that, when drawn to the size of wire specified and coated with

zinc, the finished strand and the individual wires shall be of

uniform quality and have the properties and characteristics as

prescribed in this specification.

5.2 The slab zinc, when used for the coating, shall be any

grade of zinc conforming to Specification B6.

6. Stranding

6.1 Unless otherwise specified, strand shall have a left lay. A

left lay is defined as a counter-clockwise twist away from the

observer. All wires shall be stranded with uniform tension.

Stranding shall be sufficiently close to ensure no appreciable

reduction in diameter when stressed to 10 % of the minimum

breaking strength.

6.2 The 3-wire strand shall consist of three wires concen-

trically twisted with a uniform pitch of not less than 14 nor

more than 203 the specified nominal diameter of the strand.

6.3 The 7-wire strand shall consist of a center wire with a

6-wire layer concentrically twisted over it with a uniform pitch

of not more than 163 the specified nominal diameter of the

strand.

6.4 The 19-wire strand shall consist of a center wire with a

6-wire layer concentrically twisted over it, having a right lay

and a uniform pitch of not more than 163 the nominal

diameter of this 7-wire core. The nominal diameter of this

7-wire core shall be considered to be 33 the nominal diameter

A 90⁄A 90M Test Method for Weight [Mass] of Coating on

Iron and Steel Articles with Zinc or Zonc-Alloy Coatings

A 902 Terminology Relating to Metallic Coated Steel Prod-

ucts

B6 Specification for Zinc

3. Terminology

3.1 Definitions—For definitions of terms used in this stan-

dard, refer to Terminology A 902.

3.2 Definitions of Terms Specific to This Standard:

3.2.1 strand—the designation of the finished strand shall be

expressed as the nominal diameter of the strand, the number of

*A Summary of Changes section appears at the end of this standard.

Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.

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1

This specification is under the jurisdiction of ASTM Committee A05 on

Metallic Coated Iron and Steel Products and is the direct responsibility of

Subcommittee A05.12 on Wire Specifications.

Current edition approved October 1, 2003. Published December 2003. Originally

approved in 1962. Last previous edition approved in 1998 as A 475 - 98.

2

For referenced ASTM standards, visit the ASTM website, www.astm.org, or

contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM

Standards volume information, refer to the standard’s Document Summary page on

the ASTM website.

TABLE 1 Physical Properties of Zinc-Coated Steel Wire Strand

NOTE 1—The numbers in boldface type indicate sizes and grades most commonly used and readily available.

Nominal

Number

Diameter

of Wires

of Strand,

in Strand

in. [mm]

Minimum Breaking Strength of Strand, lbf [kN]

[6.35]

3

0.120 [3.05]

117

[174]

[6.35]

3

0.120 [3.05]

117

[174]

[6.35]

7

0.080 [2.03]

121

[180]

[7.14]

3

0.130 [3.30]

137

[204]

[7.14]

7

0.093 [2.36]

164

[244]

[7.94]

3

0.145 [3.68]

171

[255]

[3.18]

7

[3.97]

7

[4.76]

7

[4.76]

7

[5.56]

3

[5.56]

7

7

0.104 [2.64]

205

[305]

7

0.109 [2.77]

225

[335]

3

0.165 [4.19]

220

[328]

7

0.120 [3.05]

273

[407]

7

0.145 [3.68]

399

[595]

Utilities GradeA

. . .

. . .

. . .

2 400 [10.676] (1)B

. . .

. . .

3 150 [14.012] (2)B

4 500 [20.017] (3)B

. . .

. . .

4 600 [20.462] (1)B

6 500 [28.913] (3)B

. . .

6 000 [26.689] (1)B

8 500 [37.810] (3)B

11 500 [51.155] (4)B

18 000 [80.068] (4)B

[7.94]

[7.94]

[9.52]

[9.52]

[11.11]

[12.70]

[12.70]

[14.29]

[14.29]

[15.88]

7

0.165 [4.19]

517

[770]

25 000 [111.206] (4)B

19

0.100 [2.54]

504

[751]

. . .

7

0.188 [4.78]

671

[1000]

. . .

19

0.113 [2.87]

637

[949]

. . .

7

0.207 [5.26]

813

[1211]

. . .

[15.88]

19

0.125 [3.18]

796

[1186]

. . .

[19.05]

19

0.150 [3.81]

1 155

[1721]

. . .

[22.22]

19

0.177 [4.50]

1 581

[2356]

. . .

[25.40]

19

0.200 [5.08]

2 073

[3089]

. . .

[25.40]

37

0.143 [3.63]

2 057

[3065]

. . .

Common

Grade

540 [2.402]

870 [3.870]

1 150 [5.115]

. . .

1 400 [6.228]

1 540 [6.850]

1 860 [8.274]

. . .

1 900 [8.452]

2 080 [9.252]

2 570 [11.432]

2 490 [11.076]

3 200 [14.234]

. . .

3 330 [14.813]

4 250 [18.905]

5 700 [25.355]

7 400 [32.917]

7 620 [33.895]

9 600 [42.703]

9 640 [42.881]

11 600 [51.599]

11 000 [48.930]

16 000 [71.172]

21 900 [97.416]

28 700 [127.664]

28 300 [125.885]

Siemens-

High-

Extra High-

Martin

Strength

Strength

Grade

Grade

Grade

910 [4.048]

1 330 [5.916]

1 830 [8.140]

1 470 [6.539]

2 140 [9.519]

2 940 [13.078]

1 900 [8.452]

2 850 [12.677]

3 990 [17.748]

. . .

. . .

. . .

2 340 [10.409]

3 500 [15.569]

4 900 [21.796]

2 560 [11.387]

3 850 [17.126]

5 400 [24.020]

3 040 [13.523]

4 730 [21.040]

6 740 [29.981]

. . .

. . .

. . .

3 150 [14.012]

4 750 [21.129]

6 650 [29.581]

3 380 [15.035]

5 260 [23.398]

7 500 [33.362]

4 250 [18.905]

6 400 [28.469]

8 950 [39.812]

4 090 [18.193]

6 350 [28.246]

9 100 [40.479]

5 350 [23.798]

8 000 [35.586]

11 200 [49.820]

. . .

. . .

. . .

5 560 [24.732]

8 360 [37.187]

11 800 [52.489]

6 950 [30.915]

10 800 [48.040]

15 400 [68.503]

9 350 [41.591]

14 500 [64.499]

20 800 [92.523]

12 100 [53.823]

18 800 [83.627]

26 900 [119.657]

12 700 [56.492]

19 100 [84.961]

26 700 [118.768]

15 700 [69.837]

24 500 [108.981]

35 000 [155.688]

16 100 [71.616]

24 100 [107.202]

33 700 [149.905]

19 100 [84.961]

29 600 [131.667]

42 400 [188.605]

18 100 [80.513]

28 100 [124.995]

40 200 [178.819]

26 200 [116.543]

40 800 [181.487]

58 300 [259.331]

35 900 [159.691]

55 800 [248.211]

79 700 [354.523]

47 000 [209.066]

73 200 [325.610]

104 500 [464.839]

46 200 [205.508]

71 900 [319.827]

102 700 [456.832]

58 900 [262.000]

91 600 [407.457]

130 800 [581.827]

73 000 [324.720]

113 600 [505.318]

162 200 [721.502]

[28.58]

37

0.161 [4.09]

2 691

[4010]

. . .

36 000 [160.136]

[31.75]

37

0.179 [4.55]

3 248

[4840]

. . .

44 600 [198.391]

Nominal

Approximate

Diameter

Weight of

of Coated

Strand,

Wires in

lb⁄1000

Strand,

ft [kg⁄

in. [mm]

km]

0.041 [1.04]

32

[48]

0.052 [1.32]

51

[76]

0.062 [1.57]

73

[109]

0.065 [1.65]

80

[119]

0.104 [2.64]

88

[131]

0.072 [1.83]

98

[146]

8

1

5

32

16

16

32

32

4

4

4

32

32

16

16

16

8

8

16

2

2

16

16

8

8

4

8

1

1

11⁄8

11⁄4

3

3

7

7

1

1

1

9

9

5

5

5

3

3

7

1

1

9

9

5

5

3

7

A

B

The utilities grade is used principally by communication and power and light industries.

Refer to elongation requirements specified in Section 8.

7. Breaking Strength and Weight

7.1 The approximate weight per unit length of strand and

the minimum breaking strength of the finished strand shall be

as specified in Table 1.

7.2 A test in which the breaking strength is below the

minimum specified and which may have been caused by the

slipping of the specimen in the jaws of the testing machine, by

breaking within the jaws or within 1 in. [25.4 mm] of the jaws,

or by the improper socketing of a specimen shall be disre-

garded and another sample from the same coil or reel shall be

tested. Tests shall be made on lengths of strand that do not

contain wire joints or splices.

8. Elongation

8.1 The elongation of the strand in 24 in. [610 mm] shall be

not less than that specified in Table 3.

8.2 The elongation shall be determined as the percent

increase in separation between the jaws of the testing machine

from the position after application of the initial load to the

position at the initial failure in the test specimen. The separa-

tion of the jaws of the testing machine shall be approximately

2 ft when under an initial load equal to 10 % of the required

minimum breaking strength of the strand. The elongation

values shall be recorded only for specimens which break over

1 in. from the jaws of the testing machine. Additional samples

shall be taken from the same coil or reel when the previous

tests are to be disregarded.

8.3 Elongation tests shall be made on lengths of strand

which do not contain wire joints or splices.

9. Ductility of Steel

9.1 The zinc-coated wire shall not fracture when wrapped at

a rate not exceeding 15 turns⁄min in a close helix of at least 2

turns around a cylindrical mandrel. The mandrel diameter for

testing common and Siemens-Martin grade strand shall be

equal to the nominal diameter of the individual wires of the

strand. The mandrel diameter for utilities, high-strength, and

extra high-strength grade strand, shall be equal to 33 the

nominal diameter of the individual wires of the strand.

10. Weight of Coating

10.1 The weight of zinc coating shall not be less than that

specified in Table 2.

10.2 The weight of the zinc coating shall be determined by

a stripping test in accordance with Test Method A 90⁄A 90M.

11. Adherence of Coating

11.1 The zinc-coated wire shall be capable of being

wrapped at a rate not exceeding 15 turns⁄min in a close helix

TABLE 3 Elongation Requirements for Grades of Strand

Grade of Strand

Elongation in 24

in. [610 mm],

min, %

Utilities Grade (1)A and Common Strand

10

Utilities Grade (2)A and Siemens-Martin

8

Utilities Grade (3)A and High-Strength

5

Utilities Grade (4)A and Extra High-Strength

4

Minimum Weight of Coating, oz⁄ft2 [g⁄m2] of Uncoated Wire

Surface

Class 1B

Class AC

Class BD

Class CD

0.15 [46]

0.40 [122]

0.80 [244]

1.20 [366]

0.15 [46]

0.40 [122]

0.80 [244]

1.20 [366]

0.15 [46]

0.50 [153]

1.00 [305]

1.50 [458]

0.15 [46]

0.50 [153]

1.00 [305]

1.50 [458]

0.15 [46]

0.50 [153]

1.00 [305]

1.50 [458]

0.30 [92]

0.60 [183]

1.20 [366]

1.80 [549]

0.30 [92]

0.70 [214]

1.40 [427]

2.10 [641]

0.30 [92]

0.70 [214]

1.40 [427]

2.10 [641]

0.30 [92]

0.80 [244]

1.60 [488]

2.40 [732]

0.30 [92]

0.80 [244]

1.60 [488]

2.40 [732]

0.30 [92]

0.80 [244]

1.60 [488]

2.40 [732]

0.30 [92]

0.85 [259]

1.70 [519]

2.55 [778]

0.30 [92]

0.85 [259]

1.70 [519]

2.55 [778]

0.30 [92]

0.85 [259]

1.70 [519]

2.55 [778]

0.40 [122]

0.90 [275]

1.80 [549]

2.70 [824]

0.40 [122]

0.90 [275]

1.80 [549]

2.70 [824]

0.40 [122]

0.90 [275]

1.80 [549]

2.70 [824]

0.40 [122]

0.90 [275]

1.80 [549]

2.70 [824]

0.40 [122]

0.90 [275]

1.80 [549]

2.70 [824]

0.40 [122]

0.90 [275]

1.80 [549]

2.70 [824]

0.40 [122]

0.90 [275]

1.80 [549]

2.70 [824]

0.40 [122]

1.00 [305]

2.00 [610]

3.00 [915]

0.40 [122]

1.00 [305]

2.00 [610]

3.00 [915]

0.40 [122]

1.00 [305]

2.00 [610]

3.00 [915]

Nominal Diam-

eter of Coated

Wire in the

Strand, in.

[mm]

0.041 [1.04]

0.052 [1.32]

0.062 [1.57]

0.065 [1.65]

0.072 [1.83]

0.080 [2.03]

0.093 [2.36]

0.100 [2.54]

0.104 [2.64]

0.109 [2.77]

0.113 [2.87]

0.120 [3.05]

0.125 [3.18]

0.130 [3.30]

0.143 [3.63]

0.145 [3.68]

0.150 [3.81]

0.161 [4.09]

0.165 [4.19]

0.177 [4.50]

0.179 [4.55]

0.188 [4.78]

0.200 [5.08]

0.207 [5.26]

A 475 03

TABLE 2 Nominal Diameters and Minimum Weights of Coating

for Zinc-Coated Steel WiresA

of the wires. A 12-wire outer layer, having a left lay shall be

concentrically twisted over the 7-wire core and shall have a

uniform pitch of not more than 163 the specified nominal

diameter of the strand.

6.5 The 37-wire strand shall consist of a center wire with a

6-wire layer concentrically twisted over it, having a left lay and

a uniform pitch of not more than 163 the nominal diameter of

this 7-wire inner core. The nominal diameter of this 7-wire

inner core shall be considered to be 33 the nominal diameter

of the wire. An intermediate layer of 12 wires having a right lay

shall be concentrically twisted over this 7-wire core and shall

have a uniform pitch of not more than 163 the nominal

diameter of this 19-wire core. The nominal diameter of this

19-wire core shall be considered as 53 the nominal diameter of

the wires. An 18-wire outer layer, having a left lay shall be

concentrically twisted over the 19-wire core and shall have a

uniform pitch of not more than 163 the specified nominal

diameter of the strand.

6.6 All wires in the strand shall lie naturally in their true

positions in the completed strand and, when the strand is cut,

the ends shall remain in position or be readily replaced by hand

and then remain in position. This may be accomplished by any

means or process, such as preforming, post forming, or form

setting.

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A

For intermediate sizes of wire in the strand, the weight designations are the

same as for the next finer size shown in this table.

B

Class 1 (formerly “galvanized”) coating applies to common grade of strand

only.

C

D

Class A, “extra galvanized” and “double galvanized” are equivalent terms.

Class A, Class B, and Class C coatings apply to all grades of strand.

A

See Table 1, Footnote B.

of at least two turns around a cylindrical mandrel equal to 33

the nominal diameter of the wire under test, without cracking

or delaminating the zinc coating to such an extent that any zinc

can be removed by rubbing with the bare fingers. Loosening or

detachment during the adhesion test of superficial small

particles of zinc formed by mechanical polishing of the surface

of zinc-coated wire shall not be considered cause for rejection.

12. Joints and Splices

12.1 Electric-welded butt joints made prior to the start of

cold drawing of the wire are permitted; however, no electric-

welded butt joints shall be made during the cold drawing

operation. Electric-welded butt joints of the wire shall be

permitted only as specified in 12.2.

12.2 In 3-wire strand, there shall be no joints made in the

individual finished wire. In 7-wire strand, joints made in

individual finished wires shall be acceptable provided there is

not more than one joint in any 150-ft [45.7-m] section of the

completed strand and the location of each joint is marked on

the strand with paint or some other distinguishing mark.

Factory joints made in the individual finished wires of 19 and

37-wire strand shall be kept well spaced and at a minimum in

number.

12.3 Joints in the wires composing the strand shall be either

the brazed-lap type or electric-butt-welded type. When the

brazed type of joint is used, the length of the lap shall be not

less than 33 the diameter of the wire and the overlapping faces

shall be smooth, clean, properly fluxed, and completely cov-

ered by the brazing metal. When the electric-welded type of

joint is used, care shall be taken to prevent injury to the wire

during electric-butt welding. All joints shall be well made and

shall be coated with zinc after completion so that the joints

shall have protection from corrosion equivalent to that of the

zinc-coated wire itself.

12.4 There shall be no strand joints or strand splices in any

length of the completed strand unless specifically permitted by

the purchaser.

13. Permissible Variations in Size

13.1 The diameter of the zinc-coated wire forming the

strand specified in Table 1 shall be within the limits prescribed

in Table 4.

14. Workmanship

14.1 The zinc-coated wire shall be free of imperfections not

consistent with good commercial practice. The coating shall be

continuous and reasonably uniform.

TABLE 4 Permissible Variations in Diameter of Individual Zinc-

Coated WiresA

Nominal Diameter of Coated Wires

Permissible Variations,

in the Strand, in. [mm]

6in. [mm]

0.041 to 0.060 [1.04 to 1.52]

0.002 [0.05]

0.061 to 0.090 [1.55 to 2.29]

0.003 [0.08]

0.091 to 0.120 [2.31 to 3.05]

0.004 [0.10]

0.121 and over [3.07 and over]

0.005 [0.13]

A 475 03

15. Sampling

15.1 Sampling for determination of compliance to this

specification shall be performed on each lot of material. A lot

shall consist of all the strand of one size and one grade in each

shipment. The number of samples to be taken shall be as

follows:

Number of

Samples

5000 ft [1524 m] or less

1

Over 5000 to 30 000 ft [1524 to 9144 m]

2

Over 30 000 to 150 000 ft [9144 to 45 720 m]

3

Over 150 000 ft [45 720 m]

4

15.2 Each sample taken shall be subjected to all tests

prescribed in Sections 6, 7, and 8.

15.3 In addition to the strand testing in 15.2, the individual

wires shall be tested. The number of individual wires to be

selected from each sample of strand and tested to determine

compliance with Sections 9, 10, 11, and 13 shall be as follows:

3-wire strand—3 wires

7-wire strand—4 wires

19-wire strand—3 wires from each layer (total of 6 wires)

37-wire strand—3 wires from each layer (total of 9 wires)

15.3.1 Individual wire samples selected for compliance to

Section 13 shall be discarded if any distortion of the wire

occurred during the stranding operation.

15.4 Instead of testing the wires from the completed strand

in accordance with 15.3, the producer may elect to establish

compliance with Sections 9, 10, 11, and 13 of this specification

by tests made on the wires prior to stranding, unless otherwise

stipulated by the purchaser. However, if the producer makes

this election, the purchaser still reserves the right to test wires

from the completed strand for compliance.

16. Inspection

16.1 The manufacturer shall afford the inspector represent-

ing the purchaser all reasonable facilities to satisfy him that the

material is being furnished in accordance with this specifica-

tion. All tests and inspection shall be made at the place of

manufacture prior to shipment, unless otherwise specified, and

shall be so conducted as not to interfere unnecessarily with the

operation of the works.

17. Rejection

17.1 If the wire or strand fails in the first test to meet any

requirement of this specification, two additional tests shall be

made on samples of wire or strand from the same coil or reel.

If failure occurs in either of these tests, the lot of wire or strand

shall be rejected.

18. Packaging and Package Marking

18.1 Wire strand shall be furnished in standard lengths (see

18.1.1) and in compact coils or on reels (see 18.1.2) as

specified by the purchaser; otherwise lengths shall be as agreed

upon at the time of purchase. Only one length of strand shall be

furnished in each coil or on each reel. Lengths of strand may

vary between the standard (nominal) length and 10 % over the

standard (nominal) length, unless otherwise specified by the

purchaser.

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It is recognized that the surfaces of heavy zinc coatings, particularly those

produced by hot galvanizing, are not perfectly smooth and devoid of irregularities.

If the tolerances shown in Table 4 are rigidly applied to such irregularities that are

inherent to the product, unjustified rejections of wire that would actually be

satisfactory for use could occur. Therefore, it is intended that these tolerances be

used in gaging the uniform areas of the galvanized wire.

eter, number of wires, grade of the strand, class of coating,

ASTM Specification A 475, and the name or mark of the

manufacturer. If additional information is required on the tag,

it shall be so specified at the time of purchase.

19. Keywords

19.1 steel wire strand; wire; zinc-coated steel wire strand

A 475 03

18.2 Each coil or reel shall have a strong weather-resistant

tag securely fastened to it showing the length, nominal diam-

SUMMARY OF CHANGES

Committee A05 has identified the location of selected changes to this standard since the last issue (A 475 - 98)

that may impact the use of this standard.

A 475 - 03:

cially accepted steel making process.”

(1) Renumbered sections to meet Form and Style requirements.

(6) Incorporated Note 1 into paragraph 15.3.1.

(2) Editorial changes were made in paragraphs 2.1, 3.2.1, 4.1.3,

(7) Incorporated Note 2 into paragraph 11.1.

7.1, 8.3, 10.1, 10.2, 11.1, 18.2, Section 17, and Table 1.

(8) Changed Section 14 from “Finish” to “Workmanship.”

(3) Changed Type 1 to Class 1 in paragraph 1.3 and Table 2

(9) Changed “kg⁄304.8m” to “kg⁄km” in Column 4 heading

(4) Added paragraph 4.1.5.

and changed the metric values in Column 4 in Table 1.

(5) Changed “base metal” in paragraph 5.1 to “any commer-

(10) Added Summary of Changes section.

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5

Copyright by ASTM Int'l (all rights reserved); Wed May 10 14:33:45 EDT 2006

Reproduction authorized per License Agreement with MURRAY M SOMMER (THE WIRE SOURCE LLC);

18.1.1 Standard lengths of strand are as follows: 250, 500,

1000, 2500, and 5000 ft [76, 152, 304, 760, and 1520 m].

18.1.2 Standard practice is to furnish all strand 16 in. [11.11

mm] and over in diameter on reels in lengths of 1000 ft [304

m] and over. Strand lengths of less than 1000 ft are regularly

7

furnished in coils.