1、DEUTSCHE NORM267-27Translation by DIN-Sprachendienst.In case of doubt, the German-language original should be consulted as the authoritative text. No part of this translation may be reproduced without the prior permission ofDIN Deutsches Institut fr Normung e. V., Berlin. Beuth Verlag GmbH, 10772 Be
2、rlin, Germany,has the exclusive right of sale for German Standards (DIN-Normen).!,bw“January 2004Technical delivery conditions for fastenersPart 27: Adhesive-coated steel screws, bolts and studsContinued on pages 2 to 8.ICS 21.060.10 Supersedes March 1990 edition.Mechanische Verbindungselemente Teil
3、 27: Schrauben aus Stahl mit klebender Beschichtung Technische LieferbedingungenIn 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 Techn
4、ical Committee Schrauben mit klebenden oder klemmenden Beschichtungen of the Normenausschuss Mechanische Verbindungselemente (Fasteners Standards Com-mittee).AmendmentsThis standard differs from the March 1990 edition in that it has been completely revised.Previous editionDIN 267-27: 1990-03.All dim
5、ensions are in millimetres.1 ScopeThis standard species requirements and methods of test for sizes M 3 to M 39 adhesive-coated steel screws, bolts and studs (bolts, for short) with ISO metric screw thread as in DIN ISO 261, assigned to property classes as in DIN EN ISO 898-1, for use at service temp
6、eratures ranging from 50 C to +100 C and, in special applications, up to 150 C.2 Normative referencesThis standard incorporates, by dated or undated reference, provisions from other publications. These nor-mative references are cited at the appropriate places in the text, and the titles of the publi
7、cations are listed below. For dated references, subsequent amendments to or revisions of any of these publications apply to this standard only when incorporated in it by amendment or revision. For undated references, the latest edition of the publication referred to applies.DIN 946 Determination of
8、coefcient of friction of bolt/nut assemblies under specied condi-tionsDIN 50011-12 Articial climates in technical applications Air temperature as a climatological quantity in controlled-atmosphere test installationsDIN EN 20273 Fasteners Clearance holes for bolts and screws (ISO 273 : 1979)DIN EN IS
9、O 898-1 Mechanical properties of fasteners made of carbon steel and alloy steel Part 1: Bolts, screws and studs (ISO 898-1 : 1999)DIN EN ISO 4032 Hexagon nuts, style 1 Product grades A and B (ISO 4032 : 1999)English price group 8 www.din.de www.beuth.de07.05 9639684Page 2 DIN 267-27 : 2004-01DIN EN
10、ISO 4753 Fasteners Ends of parts with external ISO metric screw thread (ISO 4753 : 1999)DIN EN ISO 7089 Plain washers Normal series Product grade A (ISO 7089 : 2000)DIN EN ISO 8673 Hexagon nuts, style 1, with metric ne pitch thread Product grades A and B (ISO 8673 : 1999)DIN ISO 261 ISO general purp
11、ose metric screw threads General plan (ISO 261 : 1998)3 Concepts3.1 Adhesive coatingCoating applied to the thread of bolts (over their whole circumference) in the form of microencapsulated adhe-sive, the bonding properties of which are activated by the process of bolting, and which serves to prevent
12、 the bolts working loose.3.2 Screw-in torqueTorque measured when a bolt is driven into a test nut (designated by Min).3.3 Input torqueTorque required to tighten a bolt to a level of stress as given in table 1 (designated by MA).3.4 Breakaway torqueTorque measured at the moment when the relative moti
13、on between test nut and bolt is detected in both stressed and unstressed assemblies (designated by MLB).3.5 Loosening torqueTorque measured after the breakaway point when unscrewing adhesive-coated bolts (designated by Mout).4 Dimensions and designation4.1 Standard coatingUnless otherwise specied, t
14、he coating shall cover a zone, measured from the bolt end, of length equal to 1,5 d 2 P *). The rst two or three turns of thread should be free from coating material to facilitate bolting. Adhesive residue in these turns is permitted unless this adversely affects bolting.Key:d Nominal thread diamete
15、r1) Zone to be covered by the coating.2) Two or three turns of thread left uncoated.Figure 1: Length and position of coated zone on bolts with standard coating4.2 Non-standard coatingFor lengths of engagement exceeding 1 d and property classes below 8.8, and for bolts with head of reduced strength,
16、the length of coated zone is to be specied (as a function of the property class) to ease disassembly. The correct length and position of the coated zone is to be established by testing, where necessary.In the case of bolt/nut assemblies, the length and position of the coated zone shall be selected s
17、o that it is in complete contact with the nut thread.*) P = pitch.-,-,-Page 3 DIN 267-27 : 2004-01If, for design reasons, a different length, lb, or distance from the bolt end, a, of the coated zone is required (cf. gure 2), both dimensions shall be indicated in the standard designation (cf. subclau
18、se 4.3), with lbbeing given a tolerance equal to 2 P.Key:lbLength of coated zonea Distance of coated zone from bolt endFigure 2: Length and position of coated zone on bolts with non-standard coating4.3 DesignationThe designation of adhesive-coated bolts conforming to this standard shall include the
19、following items, given in the order below:a) symbol MK to indicate that no special requirements regarding the coefcient of friction are specied, or symbol MKL to denote a specic coefcient of friction.b) service temperature (for bolts suitable for use at temperatures up to 150 C);c) values of lb a, i
20、n mm, where appropriate.Examples of designationEXAMPLE 1:Designation of an M 12 steel bolt (M 12), with a nominal length, l, of 80 mm (80), of property class 8.8 (8.8), provided with an adhesive coating for which no special requirements regarding the coefcient of friction are specied (MK):Bolt DIN.
21、M 12 80 8.8 MKEXAMPLE 2:Designation of an M 12 steel bolt (M 12), with a nominal length, l, of 80 mm (80), with long dog point (LD) as in DIN EN ISO 4753, of property class 8.8 (8.8), provided with an adhesive coating with a specic range of friction coefcients (MKL), with a length, lb, of 30 mm and
22、a distance from bolt end, a, of 10 mm (30 10):Bolt DIN. M 12 80 LD 8.8 MKL 30 10EXAMPLE 3:Designation of an M 12 steel bolt (M 12), with a nominal length, l, of 80 mm, with long dog point (LD) as in DIN EN ISO 4753, of property class 8.8 (8.8), provided with an adhesive coating with a specic range o
23、f friction coefcients (MKL), for use at temperatures up to 150 C (150), with a length, lb, of 30 mm and a distance from bolt end, a, of 10 mm (30 10):Bolt DIN. M 12 80 LD 8.8 MKL 150 30 105 Requirements5.1 GeneralFor standard designs of fasteners, the requirements specied in subclause 5.2.1 for ambi
24、ent temperature and service temperatures up to 100 C, and those specied in subclauses 5.4 and 5.5 shall be complied with. Any additional requirements, such as those specied in subclause 5.2.1 for service temperatures up to 150 C and those specied in subclause 5.3, shall be met if so agreed at the ti
25、me of ordering.5.2 Torques and torque ratios5.2.1 Requirements for bolts when tightenedWhen bolts are tested in accordance with subclause 6.2.1, the requirements for the MLB/MAratio and Moutspecied in table 1 shall be complied with.Page 4 DIN 267-27 : 2004-01Table 1: Torques and torque ratios at amb
26、ient temperature and at temperatures of 100 C and 150 C (bolt tightened)Thread sizeTightening torque, MA1), in Nm, for bolts of property classMinimum breakaway torque, MLB= 0,9 MA, in Nm, for bolts of property classMinimum MLB/MAratioMaximum loosen-ing torque, Mout, in Nm5.6 5.8 8.8 10.9 12.9 5.6 5.
27、8 8.8 10.9 12.9M 3M 4M 5M 6M 8M 10M 8 1M 10 1,250,61,32,64,511221,22,85,59,523460,541,22,34,19,919,81,12,55,08,620,741,40,90,90,90,90,90,91,53,06,5102655M 12M 14M 16M 12 1,25, M 12 1,5M 14 1,5M 16 1,53860907912519534,2548171,1112,5175,50,90,90,995160250M 18M 20M 22M 18 1,5, M 18 2M 20 1,5, M 20 2M 2
28、2 1,5, M 22 21281762402803905301151582162523514770,90,90,9335500800M 24M 27M 30M 24 2M 27 2M 30 23104606206701 0001 3502794145586039001 2150,90,90,91 0501 3001 700M 33M 36M 39M 33 2M 36 3M 39 38251 1001 4001 8502 3503 0007429901 2601 6652 1152 7000,90,90,92 4003 0004 000For lengths of coated zone sm
29、aller than 0,8 d, MLBmay be lower.1) MAhas been determined on the basis of an overall coefcient of friction, ges, of 0,12, assuming a 90 % utilization of the minimum yield stress (property classes 5,6 and 5.8) or 0,2 % proof stress (property classes 8.8, 10.9 and 12.9) for the relevant lowest proper
30、ty class.5.2.2 Requirements for bolts when untightenedTesting with bolts untightened is not required for standard design fasteners, but may be carried out as part of factory production control.When bolts are tested in accordance with subclause 6.2.2, the requirements for MLBand Moutspecied in table
31、2 shall be complied with.5.3 Coefcient of frictionIf an adhesive-coated bolt with a specic range of friction coefcients is required, the coefcient of the thread shall lie between 0,10 and 0,16 when tested in accordance with subclause 6.3.NOTE: For adhesive-coated bolts for which no particular requir
32、ements regarding the coefcient of friction are specied, this coefcient will generally be higher, which results in a lower achievable stress in the bolt/nut assembly when tightening the bolt.5.4 Corrosion resistanceWhen bolts are tested in accordance with subclause 6.4, the requirements specied in ta
33、ble 1 shall be com-plied with.-,-,-Page 5 DIN 267-27 : 2004-01Table 2: Torques at ambient temperature and at temperatures of 100 C and 150 C (bolt untightened)Thread sizeTorques, in NmMinMLBMoutMax. Min. Max.M 3M 4M 5M 6M 8M 10M 8 1M 10 1,250,20,411,535,50,20,411,84101,53,06,5102655M 12M 14M 16M 12
34、1,25, M 12 1,5M 14 1,5M 16 1,57,5111416223595160250M 18M 20M 22M 18 1,5, M 18 2M 20 1,5, M 20 2M 22 1,5, M 22 2192230404565335500800M 24M 27M 30M 24 2M 27 2M 30 2364249901201651 0501 3001 700M 33M 36M 39M 33 2M 36 3M 39 35560702102803302 4003 0004 0005.5 Thermal stabilityWhen bolts are tested in acc
35、ordance with subclause 6.5, the requirements specied in table 2 shall be com-plied with.6 Testing6.1 GeneralExcept for the test described in subclause 6.2.2, all tests specied in subclauses 6.2 to 6.5 are to be carried out as part of type testing (cf. subclause 5.1).6.2 Determination of breakaway to
36、rques, loosening torques and torque ratios6.2.1 Testing with bolt tightenedThe test assembly shall be as shown in gure 3 or 4. The bolt to be tested shall be passed through a washer conforming to DIN EN ISO 7089, free from grease, with a minimum hardness of 200 HV, and a bright nish, and either thro
37、ugh two distance blocks (cf. gure 3) or a spacer sleeve (cf. gure 4), and tightened by screwing into a nut at a rate of 30 min1, until the relevant MAvalue is reached. The thickness of the blocks or spacer sleeve shall be selected so that the nut thread is in complete contact with the coated zone. F
38、or tests at a temperature of 100 C or 150 C, the assembly shown in gure 4 should be used, with washers as in DIN EN ISO 7089.Page 6 DIN 267-27 : 2004-01Key:1 Washer as in DIN EN ISO 70892 Medium series clearance hole as in DIN EN 202733 Coating4 Distance block, with a hardness exceeding 35 HRC5 Nut
39、as in DIN EN ISO 4032 or DIN EN ISO 86736 Distance block, with a hardness exceeding 35 HRCFigure 3: Test assembly with distance blocksKey:1 Washer as in DIN EN ISO 70892 Medium series clearance hole as in DIN EN 202733 Coating4 Spacer sleeve, with an external diameter of not less than 2 d and a hard
40、ness exceeding 35 HRC5 Nut as in DIN EN ISO 4032 and DIN EN ISO 8673Figure 4: Test assembly with spacer sleeveAfter a cure time of 24 hours at (23 5) C, the test assembly shall be disassembled by unscrewing the bolt from the nut at a maximum rate of 30 min-1. The breakaway and loosening torques shal
41、l be measured and the ratio between them determined. When using the test assembly with spacer sleeve, either the bolt or the nut may be turned.For tests at elevated temperatures, the bolts shall be exposed to the relevant test temperature for three hours and then tested within ten seconds following
42、removal from the oven.6.2.2 Testing with bolt untightenedThe bolt to be tested shall be screwed into a nut at a maximum rate of 30 min1so that the nut thread is in complete contact with the coated zone, and the maximum screw-in torque, Min, shall be measured.After a cure time of 24 hours at (23 5) C
43、, the test assembly shall be disassembled by unscrewing the bolt from the nut at a maximum rate of 30 min1, and the breakaway and loosening torques shall be measured.-,-,-Page 7 DIN 267-27 : 2004-01For tests at elevated temperatures, the bolts shall be exposed to the relevant test temperature for th
44、ree hours and then tested within ten seconds following removal from the oven.6.3 Determining the coefcient of frictionThe bolt to be tested shall be screwed into a nut at a maximum rate of 30 m1until the stress reaches a level equal to 90 % of the yield stress for property class 5.6 or 8.8 bolts, an
45、d the coefcient of friction at this point determined as specied in DIN 946.6.4 Testing for corrosion resistanceThe resistance of bolts to the action of corrosive media shall be tested as follows.A test assembly shall be left to cure for 24 hours at (23 5) C and then conditioned at a given temperatur
46、e in a given test medium for one week, conditioning temperatures and test media being as follows:a) general purpose oils, lubricants and hydraulic oils: 120 C;b) fuels: ambient temperature;c) refrigerants, water and glycol: 90 C;d) brake uid: 90 C.Other media and conditioning temperatures shall be t
47、he subject of agreement.After conditioning, it shall be checked whether the requirements specied in table 1 are complied with.6.5 Determining the thermal stabilityA test assembly (with the bolt untightened) shall be left to cure for 72 hours and subjected to the test tempera-ture (100 C or 150 C ) f
48、or 1 000 hours. After cooling to ambient temperature it shall be checked whether the requirements specied in table 2 are complied with.6.6 Test equipment6.6.1 TorquemeterFor torque measurement, a torquemeter, accurate to within 2 % of the upper limit of the given torque range, shall be used.In cases of arbitration, the device shall be chosen so that all values can be read off in the upper half of the measuring range.6.6.2 Test nutFor bolts with coarse pitch thread, a nut as in DIN EN ISO 4032, and for bolts with ne pitch thread,
