1、Designation: A 740 98 (Reapproved 2008)Standard Specification forHardware Cloth (Woven or Welded Galvanized Steel WireFabric)1This standard is issued under the fixed designation A 740; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision
2、, the year of last revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon () 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. Scope1.1 This specification cove
3、rs woven or welded galvanizedsteel wire fabric commercially known as hardware cloth. It iscustomarily used for window and screen door guards, treeguards, industrial machine guards, sand screens, and grain bins.It serves as a protective screen against rodents and is used formany other home, farm, and
4、 industrial purposes.1.2 The values stated in inch-pound units are to be regardedas the standard.2. Referenced Documents2.1 ASTM Standards:2A 90/A 90M Test Method for Weight Mass of Coating onIron and Steel Articles with Zinc or Zinc-Alloy CoatingsB6 Specification for ZincE29 Practice for Using Sign
5、ificant Digits in Test Data toDetermine Conformance with Specifications2.2 Military Standards:3MIL-STD-129 Marking for Shipment and StorageMIL-STD-147 Palletized and Containerized Unit Loads 40Inch 3 48 Inch Pallets, Skids, Runners, or Pallet TypeBaseMIL-STD-1188 Commercial Packaging of Supplies and
6、Equipment3. Terminology3.1 Definitions of Terms Specific to This Standard:3.1.1 hardware clothas used in this specification, desig-nates a material composed of cold-drawn steel wires whichhave been fabricated into fabric (or so-called “mesh”), formedby the process of weaving or electrical welding, a
7、nd subse-quently galvanized (zinc coated) by the hot-dip process. Thefinished material consists essentially of a series of longitudinal(warp) and transverse (filler) wires arranged substantially atright angles to each other.3.1.2 mesh sizeas it pertains to cloth, is the dimensionalcenter-to-center d
8、istance between warp wires and filler wires inthat order. Measurements include the width of one openingplus the thickness of one parallel zinc-coated wire. Examplesare 1 by 2 in.,12 by 1 in., etc. Thus,a1by2-in. mesh denotesthat the warp and filler wires are spaced on 1-in. 25.4-mm and2-in. 50.8-mm
9、centers respectively. For fabric with a squaremesh the mesh size is indicated by a single value.4. Ordering Information4.1 Orders for material under this specification shall includethe following information:4.1.1 Quantity (number of rolls),4.1.2 Name of material (1.1),4.1.3 Mesh size (Table 1),4.1.4
10、 Wire size (Table 1),4.1.5 Width (5.7.1),4.1.6 Roll length (5.7.2),4.1.7 Woven or welded, if necessary (Table 1), and4.1.8 ASTM designation and year of issue.NOTE 1A typical ordering description is as follows: “ten 100-ft Rollsof14-in. Hardware Cloth, Wire Size 0.0258 in., 24 in. wide, to ASTMA 740
11、.”5. Manufacture5.1 Base MetalThe base metal of hardware cloth shall beof good commercial quality carbon steel wire.5.2 Zinc for Coating The zinc used in the galvanizingprocess shall be any grade of zinc conforming to SpecificationB6.1This specification is under the jurisdiction of ASTM Committee A0
12、5 onMetallic-Coated Iron and Steel Products and is the direct responsibility ofSubcommittee A05.12 on Wire Specifications.Current edition approved May 1, 2008. Published July 2008. Originally approvedin 1976. Last previous edition approved in 2003 as A 740 98(2003).2For referenced ASTM standards, vi
13、sit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.3Available from Standardization Documents Order Desk, DODSSP, Bldg. 4,Section D, 700 Robbins Av
14、e., Philadelphia, PA 19111-5098, http:/www.dodssp.daps.mil.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.5.3 Fabrication Hardware cloth shall be of wire woven orwelded into squares or rectangles and then galvanized by thehot-dip pr
15、ocess. The mesh size and wire size after galvanizingshall conform to Table 1. Approximate weights for the productare also shown in Table 1.5.4 Mesh CountThe mesh size in inches shall be deter-mined by counting the meshes for any interval of one continu-ous linear foot, in the direction of either the
16、 warp or filler wiresand finding the mesh size in Table 2.5.5 Wire Diameter All wire diameter designations in thisspecification for hardware cloth are finished sizes after galva-nizing. Wire diameter for the warp and filler wires shall bedetermined separately by checking the average measureddiameter
17、s of not less than ten warp wires and the same numberof filler wires, taken at random from a single roll of finishedhardware cloth.5.6 Weight of Coating:5.6.1 The weight of zinc coating shall be determined on asample of cloth approximately 25 in.2161 cm2 in area. Thecoating shall be tested for weigh
18、t by a stripping test inaccordance with Test Method A 90/A 90M. Wire diameter forcalculating purposes shall be the average measured diameters,after stripping, of at least five warp wires and an equal numberof filler wires.5.6.2 As the fabric is galvanized after welding/weaving thecoating weight will
19、 be much higher than the present specifi-cation and we suggest the following with the addition of Table3.5.6.3 Coating weight thus determined shall be to the mini-mums shown in Table 3. The values are a minimum asdetermined by the rounding method in Practice E 29.5.7 Width and Length:5.7.1 Stock wid
20、ths of all standard sizes of hardware clothare 24, 30, 36, and 48 in. 610, 762, 914, and 1219 mm.5.7.2 Unless otherwise specified, hardware cloth shall befurnished in standard stock rolls of 50 linear ft 15.2 m or 100linear ft 30.5 m in length. No standard stock roll shall containmore than two piece
21、s, and no single piece shall be less than 10linear ft 3.0 m in length.5.8 SplicesSplices not more than 112 in. 38 mm long,and with no projecting ends (tails), shall be permitted at anypoint of any individual wire if the number of splices does notexceed 30 in any roll, or two in any square foot 0.093
22、 m2.5.9 EdgesBoth edges of woven cloth shall be selvaged.Edges, either woven or welded, shall be so formed as toprevent raveling.6. Permissible Variations6.1 For specified wire diameters 0.0317 in. 0.805 mm orlarger, the average diameter as determined in 5.5 for either thewarp or filler wires shall
23、not be more than 0.0015 in. 0.038mm below the diameter specified. For specified diameterssmaller than 0.0317 in., the average value as determined in 5.5shall not be more than 0.001 in. 0.025 mm below thespecified diameter.6.2 The average diameter of the stripped wire as determinedin 5.6.1 shall not
24、be below the specified diameter more than0.0025 in. 0.064 mm for sizes 0.0317 in. 0.805 mm orlarger, or more than 0.002 in. 0.051 mm for sizes smaller than0.0317 in.NOTE 2For purposes of determining conformance with this specifi-cation, the specified tolerance limits are absolute limits as defined i
25、nPractice E29.6.3 Tolerance on MeshThe tolerance on the mesh sizesshall comply with Table 4.6.4 Tolerance on Fabric WidthThe tolerance on the fabricwidth shall comply with Table 5.6.5 The measured length of the roll shall not be more than4 in. 102 mm under the specified length.7. Workmanship7.1 Hard
26、ware cloth shall have smooth edges and shall befree of tears and projecting tails. The coating shall be continu-ous and reasonably uniform.TABLE 1 Mesh Size, Wire Size, and WeightAMesh Size, in. mmConstruc-tionDiameter of WireAfter Galvanizing,in. mmApproximateWeight, lb/100ft2kg/m21by12 25.4 by 12.
27、7 Welded 0.062 1.57 38 1.861by12 25.4 by 12.7 Welded 0.057 1.45 34 1.6634 19.0 Welded 0.062 1.57 38 1.8634 19.0 welded 0.057 1.45 36 1.7734 19.0 Welded 0.041 1.04 13 0.6558 15.9 Welded 0.047 1.20 25 1.2112 by 1 12.7 by 25.4 Welded 0.062 1.57 38 1.8612 by 1 12.7 by 25.4 Welded 0.057 1.45 34 1.6612 by
28、 1 12.7 by 25.4 Welded 0.041 1.04 16 0.7812 12.7 Welded 0.062 1.57 52 2.5412 12.7 Welded 0.041 1.04 25 1.2212 12.7 Woven 0.041 1.04 27 1.3212 12.7 Welded 0.0317 0.805 14 0.7012 12.7 Welded 0.0258 0.655 10 0.47512 10.6 Welded 0.0354 0.899 23 1.1113 8.5 Welded 0.0317 0.805 23 1.1113 8.5 Woven 0.0317 0
29、.805 26 1.2714 6.4 Woven 0.0258 0.655 25 1.2214 6.4 Welded 0.0217 0.551 14 0.6918 3.2 Woven 0.0173 0.439 22 1.07AFirst dimension of rectangular meshes is spacing of warp wires (see 3.2).TABLE 2 Mesh Count Versus Mesh SizeMesh Count in 1 ft305 mmMesh Size, in. mm9618 3.24814 6.43613 8.529512 10.62412
30、 12.71958 15.91634 19.012 1 25.4TABLE 3 Mesh Size and Minimum Coating WeightSurface AreaMesh Size, in. mmACoating Weight, min,oz/ft2g/m2mesh size #12 12.7 1.3 40012 12.7 mesh size #34 19 1.2 37534 19 mesh size # 1 25.4 1.1 335AWhen the distance between warp and filler wires is different, the minimum
31、distance is taken.A 740 98 (2008)28. Sampling8.1 For purposes of tests, one roll from each of 50 rolls ofhardware cloth or fraction thereof in a shipment shall beselected as a sample. When the rolls are palletized forshipment, the pallet containing the selected sample roll shallfirst be inspected fo
32、r conformance to 10.2 and 10.3.8.2 The roll shall be inspected for length (5.7.2), the numberand condition of splices (5.8), the condition of the edges (5.9),general workmanship (7.1), and conformance to prescribedpackaging, marking, and loading requirements (Section 10).8.3 The sample shall be subj
33、ected to tests for width, wirediameter, and mesh count in accordance with 5.4, 5.5, and5.7.1.8.4 A sample shall be cut from near the end of the roll andtested for weight of zinc coating in accordance with 5.6.9. Retests and Rejection9.1 Should the hardware cloth in the sample roll fail to passinspec
34、tion or fail on one or more of the tests (8.2, 8.3, and 8.4)the roll shall be rejected. Four additional rolls in the lot shall besimilarly checked. If any of these four fail, the lot shall berejected.9.2 Rejected lots may be screened and subsequently resub-mitted for inspection.10. Packaging, Markin
35、g, and Loading10.1 Each roll of hardware cloth shall be tightly rolled andfirmly tied. Each roll shall carry a tag showing the mesh size,wire size, width, length, ASTM designation A 740, and thename or mark of the manufacturer.10.2 Packaging for U.S. government-procured hardwarecloth shall be design
36、ated as either Level A or Commercial.When Level A packaging is specified, the hardware cloth,packaged as specified in 10.1, shall be palletized in accordancewith MIL-STD-147, Load Type XIII. Commercial packagingshall be as specified in 10.1 and MIL-STD-1188.10.3 Marking for Level A U.S. government s
37、hipments shallbe in accordance with MIL-STD-129. Marking for commercialU.S. government shipments shall be in accordance with MIL-STD-1188. Other marking shall be as specified in the contractor order.11. Inspection11.1 Unless otherwise specified in the contract or purchaseorder the manufacturer is re
38、sponsible for the performance of allinspection requirements as specified herein. The purchaser,however, reserves the right subsequently to perform any of theinspections set forth to verify that the material is in accordancewith this specification.11.2 When the contract or purchase order stipulates t
39、hatinspection and tests are to be made by the purchasers inspectorprior to shipment the manufacturer shall afford the purchasersinspector all reasonable facilities necessary to satisfy him thatthe material being furnished is in accordance with this speci-fication. Mill inspection by the purchaser sh
40、all not interfereunnecessarily with the manufacturers operations. All tests andinspections shall be made at the place of manufacture, unlessotherwise agreed to.12. Certification12.1 When specified in the purchase order or contract, themanufacturers or suppliers certification shall be furnished tothe
41、 purchaser stating that samples representing each lot havebeen manufactured, tested, and inspected in accordance withthis specification and the requirements have been met. Whenspecified in the purchase order or contract, a report of the testresults shall be furnished.13. Keywords13.1 galvanized stee
42、l fabric; hardware cloth; steel wire-zinccoated; zinc-coatings-steel wire productsASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentionedin this standard. Users of this standard are expressly advised that determination of the v
43、alidity of any such patent rights, and the riskof infringement of such rights, are entirely their own responsibility.This standard is subject to revision at any time by the responsible technical committee and must be reviewed every five years andif not revised, either reapproved or withdrawn. Your c
44、omments are invited either for revision of this standard or for additional standardsand should be addressed to ASTM International Headquarters. Your comments will receive careful consideration at a meeting of theresponsible technical committee, which you may attend. If you feel that your comments ha
45、ve not received a fair hearing you shouldmake your views known to the ASTM Committee on Standards, at the address shown below.This standard is copyrighted by ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959,United States. Individual reprints (single or multipl
46、e copies) of this standard may be obtained by contacting ASTM at the aboveaddress or at 610-832-9585 (phone), 610-832-9555 (fax), or serviceastm.org (e-mail); or through the ASTM website(www.astm.org).TABLE 4 Tolerance on MeshMesh Size, in. mm Tolerance, in. mmmesh size #12 12.7 60.031 60.7912 12.7 mesh size #34 19.0 60.042 61.0734 19.0 mesh size # 1 25.4 60.063 61.60TABLE 5 Tolerance on Fabric WidthFabric Width, in. mm Tolerance, in. mmwidth # 24 610 60.125 63.1724 610 width # 36 914 60.187 64.7536 914 width # 48 1219 60.250 66.35A 740 98 (2008)3
