1、ICS 23.040.60Ltlose und geltete Rohrverschraubungen berwurfmuttern der Reihe LLIn keeping with current practice in standards published by the International Organization for Standardization(ISO), a comma has been used throughout as the decimal marker.ForewordThis standard has been prepared by Technic
2、al Committee Rohrverschraubungen of the NormenausschussRohrleitungen und Dampfkesselanlagen (Pipelines and Pressure Vessels Standards Committee).The specifications for S and L series coupling nuts and for type A nuts for use with cutting rings as in DIN 3861and 24 cone metric couplings as in DIN 386
3、5 (excluding series LL 3 and LL 16 fittings) are now given inDIN EN ISO 8434-1.AmendmentsThis standard differs from the May 1985 edition in that it has been editorially revised to bring it into line withthe specifications given in DIN EN ISO 8434-1.Previous editionsDIN 4601: 1930-08; DIN 7606: 1936-
4、07, 1937-11, 1939-09, 1941-02, 1947-05; DIN 3870: 1954-11, 1957-05,1961-08, 1965-09, 1983-01, 1985-05.Ref. No. DIN 3870 : 2001-09English price group 05 Sales No. 010505.02DEUTSCHE NORM September 20013870Continued on pages 2 and 3. No part of this translation may be reproduced without the prior permi
5、ssion ofDIN Deutsches Institut fr Normung e. V., Berlin. Beuth Verlag GmbH, 10772 Berlin, Germany,has the exclusive right of sale for German Standards (DIN-Normen).Coupling nuts (LL series) for use withcompression couplingsTranslation by DIN-Sprachendienst.In case of doubt, the German-language origi
6、nal should be consulted as the authoritative text.This standard, together withDIN EN ISO 8434-1, November 1997edition, supersedes May1985 edition.All dimensions are in millimetres.1 ScopeThis standard specifies the design and dimensions of extra-light duty series (LL) coupling nuts for use withcompr
7、ession couplings.2 Normative referencesThis standard incorporates, by dated or undated reference, provisions from other publications. Thesenormative references are cited at the appropriate places in the text, and the titles of the publications are listedbelow. For dated references, subsequent amendm
8、ents to or revisions of any of these publications apply tothis standard only when incorporated in it by amendment or revision. For undated references, the latestedition of the publication referred to applies.Page 2DIN 3870 : 2001-09DIN 13-5 General purpose ISO metric screw threads Nominal sizes for
9、1 mm and 1,25 mm finepitch threads with diameters from 7,5 mm to 200 mmDIN 13-6 General purpose ISO metric screw threads Nominal sizes for 1,5 mm fine pitch threadswith diameters from 12 mm to 300 mmDIN 13-7 General purpose ISO metric screw threads Nominal sizes for 2 mm fine pitch threadswith diame
10、ters from 17 mm to 300 mmDIN 3859-1 Compression fittings and couplings Technical delivery conditionsDIN 3861 Compression rings (ferrules) for use with compression couplings Design and type Wcompression ends (ports)DIN 3863 Spherical liners for use with compression couplings Design and type U and Y p
11、ortsDIN 3865 Compression fittings and couplings 24 reducing nipples for use with type Wcompression ends as in DIN 3861DIN EN ISO 4042 Fasteners Electroplated coatings (ISO 4042 : 1999)DIN EN ISO 8434-1 Metallic tube connections for fluid power and general use Part 1: 24 compressionfittings (ISO 8434
12、1 : 1994)DIN ISO 965-2 ISO general purpose metric screw threads Tolerances Part 2: Limits of sizes for generalpurpose external and internal screw threads Medium quality (ISO 965-2 : 1998)3 Dimensions and designationDesign details left unspecified in figure 1 shall be selected as appropriate.Type A
13、cf. DIN EN ISO 8434-1).Type B, for use with DIN 3863 spherical liners.Thread countersunk to major diameter.1) Thread run-out or thread undercut (optional).2) For cold-pressed coupling nuts, a maximum overspill of 1 mm is permitted.3) Thread minor diameter.Figure 1: Nut dimensions (notation)Type A 2
14、 Type A 3, Type B 1, Type B 2,with thread run-out with thread run-out with thread undercut with thread run-out1)2)3)3)3)3)Page 3DIN 3870 : 2001-09Designation of a type B coupling nut with thread run-out or thread undercut (B), extra-light duty series (LL), madeof steel (St), for a 12 mm pipe outsid
15、e diameter (12):Nut DIN 3870 B LL 12If a specific thread design is required, this shall be incidated in the designation by including the relevant typenumber.EXAMPLE:Designation of a type B coupling nut with thread run-out (B 2), extra-light duty series (LL), made of copper-zinc alloy (MS), for a 12
16、mm pipe outside diameter (12):Nut DIN 3870 B 2 LL 12 MSTable 1: Nut dimensions4 MaterialsThe standard material of coupling nuts shall be steel, as specified in DIN 3859-1. Other materials specified inDIN 3859-1 shall be the subject of agreement, and the relevant symbol added to the designation. In c
17、ases wherea given manufacturing process (e.g. brazing) requires the use of other materials, these shall be selected withregard to the stress involved.5 Screw thread and finishCoupling nuts shall be provided with an ISO metric screw thread as specified in DIN 13-5 to DIN 13-7, mediumtolerance quality
18、 as in DIN ISO 965-2.The standard finish shall be Fe/Zn 8c2C as in DIN EN ISO 4042. Other types of finish (cf. DIN 3859-1) shall bethe subject of agreement, with the relevant symbol being included in the designation.6 Technical delivery conditionsThe technical delivery conditions specified in DIN 3859-1 shall apply.CompressioncouplingSeriesPipeoutsidediameterNominalpressure, inbar, for typeThread size(d1),for type1) Turned collar, with dimensions d3and m at the manufacturers discretion.2) Applies only to compressed air brake systems.LL(extra-lightduty)2)1)1)
