DEUTSCHE NORM 267-27
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Translation by DIN-Sprachendienst.
In case of doubt, the German-language original should be consulted as the authoritative text.
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DIN Deutsches Institut für Normung e. V., Berlin. Beuth Verlag GmbH , 10772 Berlin, Germany,has the exclusive right of sale for German Standards (DIN-Normen).
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January 2004
Technical delivery conditions for fasteners
Part 27: Adhesive-coated steel screws, bolts and studs
Continued on pages 2 to 8.
ICS 21.060.10
Supersedes March 1990 edition.
Mechanische Verbindungselemente – Teil 27: Schrauben aus Stahl mit klebender Beschichtung – Technische Lieferbedingungen
In keeping with current practice in standards published by the International Organization for Standardization (ISO), a comma has been used throughout as the decimal marker.
Foreword
This standard has been prepared by Technical Committee Schrauben mit klebenden oder klemmenden Beschichtungen  of the Normenausschuss Mechanische Verbindungselemente (Fasteners Standards Com-mittee).
Amendments
This standard differs from the March 1990 edition in that it has been completely revised.Previous edition DIN 267-27: 1990-03.
All dimensions are in millimetres.
1 Scope
This standard specifies 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 temperatures ranging from –50 °C to +100 °C and, in special applications, up to 150 °C.
2 Normative references
This 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 publications 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 coefficient of friction of bolt/nut assemblies under specified condi-tions DIN 50011-12 Artificial climates in technical applications – Air temperature as a climatological quantity
in controlled-atmosphere test installations
DIN EN 20273 Fasteners – Clearance holes for bolts and screws (ISO 273 : 1979)
DIN EN ISO 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.de
07.05
9639684
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DIN 267-27: 2004-01
DIN EN 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 fine pitch thread – Product grades A and B
(ISO 8673 : 1999)
DIN ISO 261 ISO general purpose metric screw threads – General plan (ISO 261 : 1998)
3 Concepts
3.1 Adhesive coating
Coating 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 the bolts working loose.
3.2 Screw-in torque
Torque measured when a bolt is driven into a test nut (designated by M in ).
3.3 Input torque
Torque required to tighten a bolt to a level of stress as given in table 1 (designated by M A ).
3.4 Breakaway torque
Torque measured at the moment when the relative motion between test nut and bolt is detected in both stressed and unstressed assemblies (designated by M LB ).
3.5 Loosening torque
Torque measured after the breakaway point when unscrewing adhesive-coated bolts (designated by M out ).
4 Dimensions and designation
4.1 Standard coating
Unless otherwise specified, the coating shall cover a zone, measured from the bolt end, of length equal to 1,5 d  ± 2 P  *). The first 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.
d  Nominal thread diameter
1) 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 coating
4.2 Non-standard coating
For lengths of engagement exceeding 1 d  and property classes below 8.8, and for bolts with head of reduced strength, the length of coated zone is to be specified (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 so that it is in complete contact with the nut thread.*) P  = pitch.
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DIN 267-27: 2004-01
If, for design reasons, a different length, l b, or distance from the bolt end, a, of the coated zone is required (cf. figure 2), both dimensions shall be indicated in the standard designation (cf. subclause 4.3), with l b being given a tolerance equal to ± 2 P.
l b Length of coated zone
a Distance of coated zone from bolt end
Figure 2: Length and position of coated zone on bolts with non-standard coating
4.3 Designation
The designation of adhesive-coated bolts conforming to this standard shall include the following items, given in the order below:
a) symbol ‘MK’ to indicate that no special requirements regarding the coefficient of friction are specified,
or symbol ‘MKL’ to denote a specific coefficient of friction.
b) service temperature (for bolts suitable for use at temperatures up to 150 °C);
c) values of l b × a, in mm, where appropriate.
Examples of designation
EXAMPLE 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 coefficient of friction are specified (MK):
– M 12 × 80 – 8.8 – MK
EXAMPLE 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 specific range of friction coefficients (MKL), with a length, l b, of 30 mm and a distance from bolt end, a, of 10 mm (30 × 10): – M 12 × 80 – LD – 8.8 – MKL – 30 × 10
EXAMPLE 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 specific range of friction coefficients (MKL), for use at temperatures up to 150 °C (150), with a length, l b, of 30 mm and a distance from bolt end, a, of 10 mm (30 × 10):
– M 12 × 80 – LD – 8.8 – MKL – 150 – 30 × 10
5 Requirements
5.1 General
For standard designs of fasteners, the requirements specified in subclause 5.2.1 for ambient temperature and service temperatures up to 100 °C, and those specified in subclauses 5.4 and 5.5 shall be complied with. Any additional requirements, such as those specified in subclause 5.2.1 for service temperatures up to 150 °C and those specified in subclause 5.3, shall be met if so agreed at the time of ordering.
5.2 Torques and torque ratios
5.2.1 Requirements for bolts when tightened
When bolts are tested in accordance with subclause 6.2.1, the requirements for the M LB/M A ratio and M out specified in table 1 shall be complied with.
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DIN 267-27: 2004-01
Table 1: Torques and torque ratios at ambient temperature
and at temperatures of 100 °C and 150 °C (bolt tightened)
Thread size Tightening torque, M A1), in
Nm, for bolts of
property class
Minimum breakaway torque,
M LB = 0,9 · M A, in Nm, for
bolts of
property class
Minimum
M LB/M A
ratio
Maximum
loosen-
ing torque,
M out,
in Nm
5.6  5.88.8  10.9  12.9  5.6  5.88.8  10.9  12.9
M 3 M 4 M 5 M 6
M 8 M 10M 8 × 1
M 10 × 1,25
0,6
1,3
2,6
4,5
11
22
1,2
2,8
5,5
9,5
23
46
0,54
1,2
2,3
4,1
9,9
19,8
1,1
2,5
5,0
8,6
20,7
41,4
0,9
0,9
0,9
0,9
0,9
0,9
1,5
3,0
6,5
10
26
55
M 12 M 14 M 16M 12 × 1,25, M 12 × 1,5
M 14 × 1,5
M 16 × 1,5
38
60
90
79
125
195
34,2
54
81
71,1
112,5
175,5
0,9
0,9
0,9
95
160
250
M 18 M 20 M 22M 18 × 1,5, M 18 × 2
M 20 × 1,5, M 20 × 2
M 22 × 1,5, M 22 × 2
128
176
240
280
390
530
115
158
216
252
351
477
0,9
0,9
0,9
335
500
800
M 24 M 27 M 30M 24 × 2
M 27 × 2
M 30 × 2
310
460
620
670
1 000
1 350
279
414
558
603
900
1 215
0,9
0,9
0,9
1 050
1 300
1 700
M 33 M 36 M 39M 33 × 2
M 36 × 3
M 39 × 3
825
1 100
1 400
1 850
2 350
3 000
742
990
1 260
1 665
2 115
2 700
0,9
0,9
0,9
2 400
3 000
4 000
For lengths of coated zone smaller than 0,8 d, M LB may be lower.
1) M A has been determined on the basis of an overall coefficient of friction, µges, 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 property class.
5.2.2 Requirements for bolts when untightened
Testing 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 M LB and M out specified in table 2 shall be complied with.
5.3 Coefficient of friction
If an adhesive-coated bolt with a specific range of friction coefficients is required, the coefficient 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 requirements regarding the coefficient of friction are specified, this coefficient will generally be higher, which results in a lower achievable stress in the bolt/nut assembly when tightening the bolt.
5.4 Corrosion resistance
When bolts are tested in accordance with subclause 6.4, the requirements specified in table 1 shall be com-plied with.
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Table 2: Torques at ambient temperature and at temperatures
of 100 °C and 150 °C (bolt untightened)
Thread size
Torques, in Nm
M in M LB M out Max.Min.Max.
M 3 M 4 M 5 M 6
M 8 M 10M 8 × 1
M 10 × 1,25
0,2
0,4
1
1,5
3
5,5
0,2
0,4
1
1,8
4
10
1,5
3,0
6,5
10
26
55
M 12 M 14 M 16M 12 × 1,25, M 12 × 1,5
M 14 × 1,5
M 16 × 1,5
7,5
11
14
16
22
35
95
160
250
M 18 M 20 M 22M 18 × 1,5, M 18 × 2
M 20 × 1,5, M 20 × 2
M 22 × 1,5, M 22 × 2
19
22
30
40
45
65
335
500
800
M 24 M 27 M 30M 24 × 2
M 27 × 2
M 30 × 2
36
42
49
90
120
165
1 050
1 300
1 700
M 33 M 36 M 39M 33 × 2
M 36 × 3
M 39 × 3
55
60
70
210
280
330
2 400
3 000
4 000
5.5 Thermal stability
When bolts are tested in accordance with subclause 6.5, the requirements specified in table 2 shall be com-plied with.
6 Testing
thread技术6.1 General
Except for the test described in subclause 6.2.2, all tests specified 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 torques, loosening torques and torque ratios
6.2.1 Testing with bolt tightened
The test assembly shall be as shown in figure 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 finish, and either through two distance blocks (cf. figure 3) or a spacer sleeve (cf. figure 4), and tightened by screwing into a nut at a rate of 30 min–1, until the relevant M A value is reached. The thic
kness of the blocks or spacer sleeve shall be selected so that the nut thread is in complete contact with the coated zone. For tests at a temperature of 100 °C or 150 °C, the assembly shown in figure 4 should be used, with washers as in DIN EN ISO 7089.

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