1、Designation: E784 89 (Reapproved 2017)Standard Specification forClamps, Utility, Laboratory, and Holders, Buret and Clamp1This standard is issued under the fixed designation E784; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the
2、 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.1. Scope1.1 This specification covers clamps and clamp holders foruse in securing laboratory apparatus to support stands.
3、1.2 The values stated in SI units are to be regarded as thestandard. The values given in parentheses are for informationonly.2. Referenced Documents2.1 ASTM Standards:2A48/A48M Specification for Gray Iron CastingsA276 Specification for Stainless Steel Bars and ShapesB30 Specification for Copper Allo
4、ys in Ingot FormB85 Specification for Aluminum-Alloy Die CastingsB86 Specification for Zinc and Zinc-Aluminum (ZA) AlloyFoundry and Die CastingsB139/B139M Specification for Phosphor Bronze Rod, Bar,and ShapesB247 Specification for Aluminum and Aluminum-Alloy DieForgings, Hand Forgings, and Rolled Ri
5、ng Forgings2.2 Federal Specifications:3UU-P-553 Paper, Wrapping, TissuePPP-B-566 Boxes, Folding, PaperPPP-B-601 Box, Wood, Cleated-PlywoodPPP-B-621 Box, Wood, Nailed and Lock CornerPPP-B-636 Box, Shipping, FiberboardPPP-B-676 Boxes, SetupPPP-F-320 Fiberboard, Corrugated and Solid, Sheet Stock(Contai
6、ner Grade) and Cut Shapes2.3 Federal Standard:3Fed. Std. No. 123 Marking for Shipment (Civil Agencies)2.4 Military Specifications:3MIL-P-116 Methods of Preservation-PackagingMIL-STD-1188 Commercial Packaging of Supplies andEquipment2.5 Military Standard:3MIL-STD-105 Sampling Procedures and Tables fo
7、r Inspec-tion by Attributes3. Classification3.1 Types, Sizes, and ClassesThe clamp and clamp hold-ers covered by this specification shall be of the types, classes,and sizes as specified in 3.2 3.6 (see S3.1).3.2 Type IClamp holders:3.2.1 Class 1Fixed jaw.3.2.2 Class 2Swivel jaw.3.2.3 Class 3All posi
8、tion jaw.3.3 Type IITwo-pronged clamps:3.3.1 Class 1Fixed, with holder.3.3.1.1 Size 1Small clamp expands to 38 mm (112 in.).3.3.1.2 Size 2Large clamp expands to 64 mm (212 in.).3.3.2 Class 2Swivel with holder.3.3.2.1 Size 1Small clamp expands to 38 mm (112 in.).3.3.2.2 Size 2Large clamp expands to 6
9、4 mm (212 in.).3.3.3 Class 3Swivel, duplex.3.4 Type IIIExtension clamps:3.4.1 Class 1Two-pronged.3.4.1.1 Size 1Small clamp expands to 38 mm (112 in.).3.4.1.2 Size 2Large clamp expands to 64 mm (212 in.).3.4.2 Class 2Three-pronged.3.4.2.1 Size 1Small clamp expands to 25 mm (1 in.).3.4.2.2 Size 2Large
10、 clamp expands to 98 mm (378 in.).3.4.3 Class 3Universal.3.4.3.1 Size 1Small clamp expands to 51 mm (2 in.).3.4.3.2 Size 2Large clamp expands to 76 mm (3 in.).3.5 Type IVThermometer clamp, swivel with holder.3.6 Type VClamp, double buret holder.4. Materials4.1 Base MetalClamps and clamp holders shal
11、l be manu-factured from aluminum-base alloy, zinc-base alloy, or castiron. Aluminum base alloy metal shall conform to alloynumber A380 of Specification B85. Zinc-base alloy shallconform to AG 40A of Specification B86. Cast iron shallconform to Specification A48/A48M, Class 20.1This specification is
12、under the jurisdiction of ASTM Committee E41 onLaboratory Apparatus and is the direct responsibility of Subcommittee E41.01 onLaboratory Ware and Supplies.Current edition approved Jan. 1, 2017. Published February 2017. Originallyapproved in 1981. Last previous edition approved in 2011 as E784 89 (20
13、11).DOI: 10.1520/E0784-89R17.2For referenced ASTM standards, visit 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 Naval Publicatio
14、ns and Forms Center, 5801 Tabor Ave.,Philadelphia, PA 19120.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United StatesThis international standard was developed in accordance with internationally recognized principles on standardization establish
15、ed in the Decision on Principles for theDevelopment of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.14.2 Metal FittingsFittings such as screws, nuts, and rivetsfor clamps and clamp holders shall be forged alumi
16、num orchemical-resistant alloy for either aluminum-base alloy orzinc-base alloy clamps and clamp holders. In addition zinc-base alloy clamps and clamp holders may have copper alloyfittings. Forged aluminum fittings shall conform in composi-tion to 2014 of Specification B247. Copper alloy fittings sh
17、allconform to composition to Specification B30.4.3 SpringsComponent springs of clamps shall be phos-phor bronze or corrosion-resistant steel. Phosphor bronze shallconform to Composition C51000 of Specification B139/B139M. Corrosion-resistant steel shall conform to Class 202 or302 of Specification A2
18、76.4.4 SleevesComponent sleeves of clamps may be rubber,plastic, fiber glass, non-hazardous minerals, or replaceableplastic. Unless otherwise specified by the procuring agency,rubber sleeves shall be supplied with clamps (see S2.1).4.4.1 RubberRubber for sleeves shall conform to Type R,class optiona
19、l of MIL-STD-147.4.4.2 PlasticWhen plastic sleeves are specified, they shallbe bonded firmly to the clamp jaw. The plastic sleeve shall beformed by hot dipping the clamp jaw in a vinyl plastisolconforming to Type II of MIL-P-20689.4.4.3 MineralWhen mineral sleeves are specified, theyshall be nonrave
20、ling and woven from high-quality mineralyarn.4.4.4 Fiber GlassWhen fiber glass sleeves are specified,they shall be nonraveling and woven.4.4.5 Replaceable PlasticWhen replaceable plasticsleeves are specified, they shall be durable enough not to breakdown in sand blasting, shot blasting, painting or
21、coatingoperations. Application should be quick and the resulting fit besnug and conforming.5. Dimensions, Mass, and Permissible Variations5.1 Fitting ThreadsThumbscrews, wingnuts, and holdersshall be threaded in accordance with Screw Thread Standardsfor Federal Services, Unified National Coarse Thre
22、ad Series.45.1.1 Metric threads can be used if specified.5.2 DimensionsThe dimensions and tolerances shall be asshown in Table 1.5.3 ConstructionThe illustrations shown in Figs. 1-5 arefor the convenience of identification and shall not precludeclamps and clamp holders otherwise in accordance with t
23、hisspecification.5.3.1 Type IClass 1 clamp holders shall be of one-piececonstruction, consisting of two V-grooved areas at right anglesto each other. Class 2 clamp holders shall consist of twoseparate V-grooved sections freely movable through an angleof 360 in parallel planes and position fixed by m
24、eans of a setscrew. Class 3 clamp holders shall consist of two V-groovedareas connected to each other by a double plate joint whichkeeps the V-grooved areas in planes permanently set at 90 toeach other. The plate joints have friction disks which alloweach V-grooved area full movement through an angl
25、e of 360within each plane. The V-grooved areas of each class are fittedwith thumbscrews for attachment to support rods or anchoringclamp shafts. All clamp holders shall be capable of directattachment to rods up to 13 mm (12 in.) in diameter without thenecessity of passing the clamp holders over the
26、ends of therods. All clamp holders shall be capable of attachment to rodsup to 17 mm (1116 in.) in diameter by passing the clamp holderover the ends of the rods.5.3.2 Type IIClass 1 and Class 2 two-pronged clampsshall consist of a V-grooved holder fitted with thumbscrews for4NIST Handbook 100, Natio
27、nal Bureau of Standards, is available from theNational Technical Information Service, Port Royal Road, Springfield, VA 21161.TABLE 1 Dimensions and Tolerances for Clamps and Clamp HoldersClassificationMaximum diameter of opening,mm (in.)Overall length,mm (in.)Tolerance,mm ( in.)Type of JawType Class
28、 Size Clamp Holder Clamp HolderI 1 . .1116 (17) 127 (5) 6 (14 ) . VI 2 . .1116 152 (6) 6 (14) . VI 3 . .1116 127 (5) 3 (18) . VII 1 1 38.1 (112 )1116 178 (7) 6 (14 ) round VII 1 2 63.5 (212 )1116 178 (7) 6 (14 ) round VII 2 1 38.1 (112 )1116 178 (7) 6 (14 ) round VII 2 2 63.5 (212 )1116 191 (712 )61
29、4) round VII 3 . 38.1 and 63.5 . 216 (812 (14 ) round .(112 and 212 )AIII 1 1 38.1 (112 ) . 203 (8) 6 (14) round .III 1 2 63.5 (212 ) . 228 (9) 6 (14) round .III 2 1 25.4 (1) . 152 (6) 6 (14 ) prong .III 2 2 (378 ) . 267 (1012 )1312 ) prong .III 3 1 50.8 (2) . 203 (8) 6 (14 ) prong .III 3 2 76.2 (3)
30、 . 242 (912 )614 ) prong .IV . . 3 (18 )to13(12)1116 152 (6) 6 (14) clip VV . .B 1116 254 (10) 6 (14) finger VAClamp on each end, one small and one large sized.BClamp shall be capable of holding micro to 100-mL size burets, 5 to 20 mm in diameter.E784 89 (2017)2attachment to support rods and a sprin
31、g type clamp. The clampshall have two jaws that spread under spring tension and shallbe adjustable to the maximum opening shown in Table 1 bymeans of a single screw and wingnut. Class 1 two-prongedclamps shall be of one-piece construction. Class 2 two-prongedclamps shall be of two-piece construction
32、 capable of beingextended approximately 25 mm (1 in.). The clamp section shallbe adjustable through 360 and position-fixed by means of aClass 1 Class 2Class 3FIG. 1 Type IClamp HoldersClass 1 Class 2Class 3FIG. 2 Type IITwo-Pronged ClampsE784 89 (2017)3thumbscrew or locknut on the extension shaft. C
33、lass 3 two-pronged clamps shall consist of 2 two-pronged clamps con-nected by means of a threaded shaft capable of being extendedapproximately 25 mm (1 in.), adjustable through 360, andposition-fixed by means of a locknut on the extension shaft.5.3.3 Type IIIExtension clamps shall consist of a sprin
34、g-type clamp fixed to an extension arm for insertion andpositioning in a Type I clamp holder. Class 1 extension clampshall have a two-pronged jaw that spreads under spring tensionand be adjustable to the maximum opening shown in Table 1by means of a single screw and wingnut. Class 2 extensionclamp s
35、hall have a two-pronged jaw and a one-pronged jaw,each independently adjusted by means of a separate thumb-screw. The one-pronged jaw shall be so located that it isequidistant from both prongs of the two-pronged jaw. Class 3extension clamp shall be three-pronged (of similar constructionto Class 2) o
36、r four-pronged (two two-pronged jaws, one jawbeing smaller than the other so that the smaller jaw passesbetween the prongs of the larger jaw) fitted to the extensionarms by means of a thread swivel and wingnut for positioningthe clamp at any angle.5.3.4 Type IVThermometer clamps shall consist of aV-
37、grooved holder and a spring clip having a wingnut fortightening the thermometer in the clip. The holder and clipshall be connected by means of a threaded shaft capable ofbeing extended approximately 25 mm (1 in.), adjustablethrough 350, and position-fixed by means of a locknut on theextension shaft.
38、5.3.5 Type VClamps, double buret holder shall be con-structed of a one-piece H-frame with the vertical arms curvedoutward. The ends of each arm shall have a suitable curvedfinger at right angles to the frame. Two spring-actuatedgripping arms, each with a suitable curved finger at right angleto the a
39、rm, shall be attached to each side of H-frame andaligned with the curved frame arms to form double clamps forsupporting two burets ranging in diameter from 5 to 20 mm.Burets shall be firmly gripped at two points by the clamps thusformed without sideslipping or obscuring any of the buretgraduations.
40、Insertion, adjust-ment, and removal of burets shallbe accomplished by applying pressure on the spring-actuatedarms; each side of the buret holder will operate separately. Theburet holder shall be fitted with a setscrew, centrally located,for fastening the holder to the support rod.6. Workmanship6.1
41、All clamp and clamp holders shall be free of imperfec-tions that affect their serviceability. All parts shall be con-structed of suitable gauge material to prevent deformationwhen used extensively in the laboratory. Edges and cornersshall be free of burrs and fins.7. Keywords7.1 clamps; holders; lab
42、oratory; utilityClass 1Class 2FIG. 3 Type IIIExtension ClampsFIG. 4 Type IVThermometer ClampE784 89 (2017)4SUPPLEMENTARY REQUIREMENTSThe following supplementary requirements are binding when this specification is used by theDepartment of Defense and the Federal Government for the procurement of clam
43、ps.S1. SamplingS1.1 Sampling shall be conducted in accordance with MIL-STD-105.S2. Ordering InformationS2.1 Procurement documents should specify the following:S2.1.1 Title, number, and date of this ASTM specification,S2.1.2 Level of packaging and packing required,S2.1.3 Type, class, and size require
44、d,S2.1.4 If clamps desired with sleeves other than rubber, andS2.1.5 Number of unit packages per intermediate packageand number of clamps or clamp holders per pack required.S2.2 Suppliers ResponsibilityThe supplier is responsiblefor the performance of all inspection requirements as specifiedherein.
45、Except as otherwise specified, the supplier may use hisown or any other inspection facilities and services acceptableto the government. Inspection records of the examination andtests shall be kept complete and available to the government asspecified in the contract or order. The government reserves
46、theright to perform any of the inspections set forth in thespecification where such inspections are deemed necessary toensure that supplies and services conform to prescribed re-quirements.S3. Lotting and SamplingS3.1 A lot shall consist of those clamp and clamp holders ofthe same type, same class,
47、and same size made by onemanufacturer and submitted for delivery at one time.S3.2 Sampling shall be conducted in accordance with S1.1.S4. InspectionS4.1 ExaminationSamples of clamps or clamp holdersand Level A and examination of packaging for deliveryrequirements shall be examined in accordance with
48、 the classi-fication of defects and with MIL-STD-105.S4.2 Classification of defects shall be in accordance withTable S4.1 and Table S4.2.S5. Rejection CriteriaS5.1 The sample must pass all the physical and chemicalrequirements when tested as specified to be accepted. Any testfailure will result in t
49、he rejection of the lot.S6. CertificationS6.1 Compliance with all stipulations of this specificationregarding fill, closure, marking, and other requirements notinvolving tests will be certified by the supplier.FIG. 5 Type VClamp, Double Buret HolderTABLE S4.1 Classification of Defects of Clamps or ClampHoldersCategories DefectsCritical none definedMajor AQL 4.0 % defective101 dimensions not as spe
