Appendix Quality Assurance Agreement Steel structure · Quality Assurance Agreement ... ISO 9013 (replacement for DIN 2310 ... DIN EN ISO 9692 Weld preparation • Weld preparation

Quality Assurance Agreement – Transporter Industry International GmbH – Page 1 of 28

QMA 9.103 – Version 1.0 – Status: 10/01/2017 TII Group initials: ______ Supplier initials: ______

Appendix Quality Assurance Agreement Steel structure

This quality assurance agreement is agreed between a company of Transporter Industry International Group; this corresponds to:

SCHEUERLE Fahrzeugfabrik GmbH – Otto-Rettenmaier-Strasse 15 – D-74629 Pfedelbach and/or KAMAG Transporttechnik GmbH & Co. KG – Liststrasse 3 – D-89079 Ulm and/or

NICOLAS Industrie S.A.S. – RN 6 BP 3 – F-89290 Champs-sur-Yonne TII INDIA Private Limited – Plot2, Sector 14, Phase-II – IMT Bawal – Haryana, 123501 India

(hereinafter “TII Group ”)

Table of contents

1. QUALITY ASSURANCE FOR STEEL CONSTRUCTION 2

1.1. QUALITY OF WELDED ASSEMBLIES 3

1.1.1. WELDING CONSUMABLES 6

1.1.2. USE OF MATERIALS 7

1.2. QUALITY OF PRODUCTION 9

1.2.1 LASER CUTTING TOLERANCES 10

2.2.2 CORROSION PROTECTION OF MACHINED SURFACES 10

1.3. QUALITY OF THE COATING 11

1.3.1. AREA OF APPLICATION 11

1.3.2. NORMATIVE REFERENCES 11

1.3.3. PREPARATION 12

1.3.4. PRIMING (FIRST LAYER) 15

1.3.4. SEALING OF BLANK SPOTS 16

1.3.5. PRIMING (SECOND LAYER) 16

1.3.6. TOP COAT 17

1.3.7. DRYING TIME AND TEMPERATURE 17

1.3.8. TEST METHODS 17

1.4. QUALITY OF ASSEMBLY 19

1.4.1. SCREW CONNECTIONS AND USE OF SCREW-LOCKING ELEMENTS 28



1. Quality assurance for steel construction

Quality requirements of EN 729-2

This class applies to the production of parts with high static or dynamic loads or high

safety requirements, such as for main beams, wheel bogies, rocker arms, steering

parts and steering head carriers (material S 690 < to S 960)


This class applies to the manufacture of parts with normal static or dynamic loads

and average safety needs, such as for the main beam of S355J2G3 (previously St

52-3N), cross beam, underride protection device, deck extension arm, ...


This class applies to the manufacture of parts with low stress and low need for

safety, such as for lamp supports, covers, support elements for bridges, ...



1.1. Quality of welded assemblies

All welders must have a valid welder certification according to ISO 9606

(formerly: DIN EN 287). They may only weld materials for which they are approved.

The TII Group has the right to inspect the relevant documents.

Sheets and flame-cut blanks must meet the following standard specifications and

requirements:

Standards, requirements Area Subject

EN 10204

• Inspection certificate 3.1

“Material test certificates” • Sheets

• Cuts

DIN EN 10029

• Thickness tolerances according to

tab. 1, class B

• Flatness according to tab. 4:

• Steel group L, tolerance class N

• Steel group H, tolerance class N

“Hot-rolled steel plates 3 mm

thick or above – Limit

deviations, shape tolerances,

allowable weight deviations”

• Sheets

• Cuts

DIN EN 10163 – 2

• Surface cleanliness according to

tab. 4 class B, subassembly 2

• Rust and scale-free surface

“Delivery requirements for the

surface condition of hot-rolled

steel products (sheet, wide flat

steel and profiles)”

• Sheets

• Cuts

ISO 9013 (replacement for DIN 2310

Part 3)

• Flame-cut blanks ISO 9013-331

“Welding and related processes

– Quality classification and

dimensional tolerances for

autogenic flame-cut surfaces”

• Cuts

EN 287-1 certified welders Welder certification • Welding work

DIN EN ISO 5817 assessment group B Visual inspection • Execution quality of the

welding job

DIN EN ISO 13920 AE General tolerances for welded

structures, degree of accuracy

• Untolerated dimensions

with welded structures



DIN EN ISO 9692 Weld preparation • Weld preparation for fully

connected cross-sections

of butt welds and fillet

welds and a collection of

proven sizes and shapes

When performing welding work on the TII Group, all principles included in DIN EN

ISO 729-2/3 must be considered to ensure the quality of welding of metallic

materials.

As other applicable standards in EN 729-3, item 2, “References to standards”, are

applicable, insofar as they are relevant.

This means:

Equipment of the company in terms of personnel and technology which ensures work

that is professional and state-of-the-art:

Correct selection of the welding process suitable for the application with the

parameters:

• Heat treatment: Preheating, heat treatment, if appropriate;

• Weld preparation (opening angle, joint shapes, metallic bare edges). If no details are

given for welding seams, DIN 8551 applies.

• Suitable equipment and correct operating data

(welding equipment, tools, devices, drying ovens, power source, welding wire diameter,

polarity, amperage, gas pressure, seam structure, ...);

• Operating and accessory materials (welding wire, protective gas, ...);

• Care when tacking and assembling (no misalignment, correct

• air gap, length and spacing of the tack welds);

• Correct welding sequence, position and speed



Only plates with inspection certificates according to EN 10204-3.1 are to be used.

For all other steel semi-finished products, either a manufacturer’s certificate 2.1, a

test report 2.2, or an inspection certificate 3.1 according to EN 10204.

For welding specifications not dimensioned on the drawing, the following applies:

Butt joints: a = Smin

One-sided fillet welds: a = 0.7 x Smin

Smin = smallest that is to be welded

Double-sided fillet welds: a = 0.4 x Smin workpiece thickness

Smallest fillet weld thickness a = 3 mm

The proper welding sequence, position and speed are to be respected.

Only parallel beads are to be placed.

Downhand welding and oscillating are not allowed.

Intermediate inspections of the individual beads must be performed. Any defects that

are found must be eliminated immediately by proper reworking, such as grinding out

and rewelding.

Tack welds must be free of cracks. Tack welds on cross joints and corners must be

avoided.

After completion of the component, the accuracy of its dimensions according to the

drawing must be checked and a visual inspection for apparent defects (undercuts,

pores, cracks, end craters, electrode scrapers, arc strikes, tack welds...) must be

performed and any defects must be professionally removed.

Straighten parts if necessary.

Dress welds, remove weld spatter and round all sharp edges in general.



Welded assemblies must be stamped (embossed). If no other specifications are

made by the TII Group, the company emblem, calendar week, year of manufacture

and build number in case of series production must be stamped. If the location of

identification is not defined on the drawing, the SQEs (supplier Quality Engineers)

are to be asked.

If there are uncertainties or questions before or during the execution of the work,

these need to be resolved with the SQEs in writing before further work.

If this does not happen, all of the named requirements are part of the contract and

binding for the quality inspection of the supplier.

The operation must be approved for the respective welding process. The following

procedures are used: MAG, E, UP, WIG, MIG

1.1.1. Welding consumables

(DIN EN 756, EN 440, DIN 1732 T1, EN 499)

Only consumables permitted for the material combination may be used.

Consumables must be stored and processed according to the consumable

manufacturer’s instructions.


QMA 9.103 – Version 1.0 – Status: 10/01/2017 TII Group initials: ______

Supplier initials: ______

1.1.2. Use of materials

No. Material/

designation

Material

no.

Applicable

standard

Yield point

Re [N/mm 2] with thickness [mm]

Tensile strength

Rm [N/mm 2] with thickness [mm]

Impact

strength

Kv [J] at T[C]

Minimum

ultimate strain

A [%]

1 ≤16 16≤40 40≤100 3≤100

S235J2 1.0117 EN 10025-2 235 225 215 360-510 27 at -20° 21

2

≤16 16≤40 40≤63 63≤80 80≤100 ≤40 40≤63 63≤80 80≤100

S355M* 1.8823 EN 10025-4 355 345 335 325 325 470–630 450–610 440–600 440–600 27 at -30° 22

S355ML* 1.8834 EN 10025-4 355 345 335 325 325 470–630 450–610 440–600 440–600 27 at -50° 22

S355J2 +N 1.0577+N EN 10025-2 355 345 335 325 315 470–630 470–630 470–630 470–630 27 at -20° 17

3

≤16 16≤40 40≤63 63≤80 80≤100 ≤40 40≤63 63≤80 80≤100

S460M* 1.8827 EN 10025-4 460 440 430 410 400 540–720 530–710 510–690 500–680 27 at -30° 17

S460ML* 1.8838 EN 10025-4 460 440 430 410 400 540–720 530–710 510–690 500–680 27 at -50° 17

3≤50 50≤100 3≤50 50≤100

S460QL 1.8906 EN 10025-6 460 440 550–720 550–720 30 at -40° 17

4

8≤60 8≤60

Alform 700M* 700 770–1050 40 at -40° 10

<8 >8

S700MC* 1.8974 EN 10149-2 700 680 750–950 40 at -20°(EN 0149-1) 12

3≤50 50≤100 3≤50 50≤100

S690QL 1.8928 EN 10025-6 690 650 770–940 760–930 30 at -40° 14

5 3≤50 50≤100 3≤50 50≤100

S890QL 1.8983 EN 10025-6 890 830 940–1100 880–1100 30 at -40° 11



No. Material/

designation

Materia

l

no.

Applicable

standard

Yield point

Re [N/mm 2] with thickness [mm]

Tensile strength

Rm [N/mm 2] with thickness [mm]

Impact

strength

Kv [J] at T[C]

Minimum

ultimate strain

A [%]

6

3≤50 50≤100 3≤50 50≤100

S960QL 1.8933 EN 10025-6 960 - 980–1150 - 30 at -40° 10

10≤15 10≤15

Alform 960M* 960 980–1150 30 at -40° 11

7

25-80 >80 25-80 >80

Ovako 225A**

(18MoCr6-8) 800 790 880–1080 880–1080 27 at -40° 12

<16 16≤40 40≤100 100≤160 160≤25

0 16≤40 40≤100 100≤160 160≤250

31CrMoV9 1.8519 EN10085 - 900 800 700 650 1100–1300 1000–1200 900–1100 850–1050 25 at RT 9

42CrMo4 1.7225 EN10083-3 900 750 650 550 500 1000–1200 900–1100 800–950 750–900 35 at RT 10



1.2. Quality of production

The material in use must meet the following standard specifications and requirements:

Standards, requirements Standard headers

EN 10204

• Inspection certificate 3.1B or

after consultation with Scheuerle 2.3

also 2.2 (only for quenched and

tempered, case hardening and/or

hardened steels)

“Material test certificates”

EN 10163 Part 2

• Class B, subassembly 3

EN 10163 Part 3

• Class D, subassembly 3

Delivery requirements for surface conditions of hot-rolled

steel products

EN 10083 Part 2 Quenched and tempered steels:

Technical delivery conditions

DIN 17210 Hardening steels:

Technical delivery conditions

DIN ISO 2768 mK For non-tolerated dimensions and angles

DIN ISO 1302 Surface roughness

All important features on the drawing or in the order (such as tolerated dimensions, test

dimensions, shape and position tolerances) must be 100% tested and entered on a test report.

Test reports must be able to be assigned to components (e.g. serial number, build number,

etc.).

For the tests, only calibrated test equipment is to be used. The TII Group reserves the right to

perform sample testing of the test equipment used.

For parts made of quenched and tempered steel or hardened steel or with hardened parts in

general, the actual value of the strength (N/mm²) and the measured hardness in the scale

specified on the drawing (HRC, HB, etc.) must be entered on the measurement report.

If provision is made for a mark on the drawing or in the order, the parts are to be marked at the

specified position according to the instructions (company emblem/week/year/consecutive build

number).



1.2.1 Laser cutting tolerances

If the following note can be found on a drawing...

... there are increased requirements for the tolerances of the workpieces for laser-cut plates.

(See table)

Dimensions in mm

2.2.2 Corrosion protection of machined surfaces

All machined surfaces of steel components such as boreholes, milled surfaces, threads, etc.,

must be protected against corrosion with Tectyl 846 . Components not preserved with Tectyl

846 will be rejected at goods receipt or complained about and billed for by our QA.

Workpiece

thickness

Nominal dimensions

0–3 3–10 10–35 35–

125

125–

315

315–

1000

1000–

2000

2000–

4000

4000–

6000

Tolerances

0–1 ± 0.1 ± 0.1 ± 0.1 ± 0.1 ± 0.2 ± 0.2 ± 0.3 ± 0.3 ± 0.3

1–3.15 ± 0.1 ± 0.1 ± 0.1 ± 0.15 ± 0.2 ± 0.25 ± 0.3 ± 0.4 ± 0.5

3.15–6.3 ± 0.1 ± 0.1 ± 0.15 ± 0.2 ± 0.3 ± 0.35 ± 0.4 ± 0.6 ± 0.8

6.3–20 - ± 0.3 ± 0.3 ± 0.4 ± 0.4 ± 0.5 ± 0.5 ± 0.8 ± 1.0



1.3. Quality of the coating

1.3.1. Area of application

The purpose of this instruction is to ensure a uniform quality of surface preparation and

subsequent coating for corrosion protection. This instruction applies to the TII Group, all sub-

contractors and all suppliers. It covers all parts to be coated (wet coating structure).

1.3.2. Normative references

The documents cited below are required for the application of this document. For dated

references, only the edition cited applies. For undated references, the latest edition of the

referenced document (including any amendments) applies.

DIN EN ISO 12944-4 Corrosion protection of steel structures by protective paint systems; Part

4: Types of surfaces and surface preparation

DIN EN ISO 8503-1 Surface roughness characteristics of blast-cleaned steel substrates: Part 1:

Specifications and definitions for ISO surface profile comparators for the assessment of

abrasive blast-cleaned surfaces

DIN EN ISO 2409 Paints and varnishes – Cross-cut test

DIN EN ISO 8504-2 Preparation of steel substrates before application of paints and related

products – Surface preparation methods – Part 2: Abrasive blast-cleaning

DIN EN ISO 8501-1 Preparation of steel substrates before application of paints and related

products – Visual assessment of surface cleanliness – Part 1: Rust grades and

preparation grades of uncoated steel substrates and of steel substrates after overall removal of

previous coatings



1.3.3. Preparation

A. Preparation of steel components

All sharp edges must be rounded in general.

It must be ensured that all contaminants that cannot be removed through abrasive blast-

cleaning are removed beforehand. After cleaning, the steel components must undergo abrasive

blast-cleaning according to ISO 8501-1 The grade of the blasting media must be SA 2 ½. After

abrasive blast-cleaning, the surface must have a roughness depth of 40–60 µm. A suitable

protection (e.g. taping, wrapping, etc.) is applied to all components that are not to be painted.

Coating must be carried out promptly (after 3 hours at the latest)

Thermally cut parts should not have any oxide layer on the cut edges after preparation.

Exception: It must be ensured that the component is stored in a dry place and the humidity is

so low as to prevent formation of a rust film. If a rust film has developed after storage, it must be

removed by means of another abrasive blast-cleaning.







B. Preparation before priming

The components requiring priming must be free of blasting media and dust. Prior to priming, the

components must be thoroughly cleaned with compressed air. Prior to priming, a suitable

protection (e.g. greasing, taping, wrapping, etc.) must be applied to all areas that are not to be

primed.

C. Preparation of top coat

The primed components must be thoroughly greased, cleaned and lightly ground. After grinding,

the resulting dust must be completely removed to ensure good adhesion. A suitable protection

(e.g. greasing, taping, wrapping, etc.) must be applied to all components that are not to be

painted.

If painting is performed directly after priming, light grinding is not necessary. Here, the interim

drying process must be adhered to and maintained.

1.3.4. Priming (first layer)

A. Zinc dust priming

The materials to be used are:

- Wörwag Woerophen – zinc dust paint product no. 106975

- Wörwag Woeropur – hardener, product no. 62916

- Alternative Wörwag Woeropur - hardener, product no. 107005

The volumetric mixing ratio of the zinc dust primer must be adhered to in accordance with

manufacturer specifications. For the hardener with product number 62916, the volumetric

mixing ratio according to manufacturer's specification is 4:1. When using the hardener with

product number 107005, the volumetric mixing ratio according to manufacturer's specification is

2.5:1.

The ratio must be set with a measuring scale.

After adding the hardener, the material is ready to be processed.

The layer thickness must be between 50 µm and 70 µm when dry. A primer coat must be

applied. On parts that are ordered primed, the first primer coat must be applied by the supplier.

The utilization of the primer takes place according to the order.

The surface must be free of paint defects

Any potentially arising runs, drips or flaws after priming must be corrected or reworked.



B. Priming



- Wörwag Woeropur – HS – primer W-726, product no. 110717

The volumetric 8:1 mixing ratio of the primer must be followed in accordance with

manufacturer's specifications. The ratio must be set with a measuring scale.


The layer thickness per primer coat must be between 50 µm and 70 µm when dry. A primer coat

must be applied. On parts that are ordered primed, the first primer coat must be applied by the

supplier. The primer is used according to the order.


Any potentially arising runs, drips or flaws after priming must be corrected or reworked.

1.3.4. Sealing of blank spots

After the first primer layer, all blank spots must be sealed with "Klebt und Dichtet" [glues and

seals] from Würth (Würth article number 089-0101). These spots concern in particular all

installed mounting brackets, such as for example C-tracks as well as steering pins on the top

side of the platform. This is to prevent water from penetrating into the cracks between the C-

track and beam and thereby promoting corrosion.

Important: Only acrylic or PU-based sealing material is to be used. Silicon-based sealing

material must not be used because silicon cannot be painted.

1.3.5. Priming (second layer)



- Wörwag Woeropur – HS – primer W-726. 110717

The volumetric 8:1 mixing ratio of the primer must be followed in accordance with



The layer thickness per primer coat must be between 50 µm and 70 µm when dry. A primer coat

must be applied. On parts that are ordered primed, the first primer coat must be applied by the

supplier.



1.3.6. Top coat



- Wörwag Woeropur – top coat W-755

- Wörwag Woeropur – thinner long, product no. 63222

The volumetric 4.5:1 mixing ratio of the final coat (Wörwag) must be followed in accordance with


After you add the hardener, the material is ready to be processed.

In the event of extremely warm temperatures (>25°C), up to 2% thinner can be used for

adjusting the top coat.

The layer thickness of the top coat must be between 40 µm and 60 µm when dry.


Any runs, drips or flaws in the top coat must be reworked.

1.3.7. Drying time and temperature

The drying time as well as drying temperature must be followed for all coating processes (zinc

dust priming, priming as well as top coating) in accordance with manufacturer's specifications.

This is the only way that the best possible corrosion protection can be ensured.

1.3.8. Test methods

A. Cross-cut test

The cross-cut test is used to determine the adhesion of one or several layers of paint to the

substrate.

Quick guide:

Use a cross-cutter to make six parallel cuts down to the substrate. Next, cross the cuts with six

corresponding cuts at a right angle. For this purpose, perform the cuts by holding the handle of

the cross-cut tester with one hand without applying additional pressure to the cutter head.

The cutting distance must be the same in each direction and, depending on the layer thickness

of the coating and type of substrate, as follows:



Test as per DIN EN ISO 2409 Test as per ASTM D 33 59 - 02

Up to 60µm layer thickness: 1mm cutting interval up to 50µm layer thickness: 1mm cutting

interval

60–120µm layer thickness: 2mm cutting spacing 50–125µm: 2mm cutting interval

120–250µm layer thickness: 3mm cutting interval

After the cross-cut test is complete, use a soft brush to slightly brush along each diagonal of the

grid several times. The evaluation of the test is performed visually, with the naked eye by

comparison with table 1.

According to the number of chipped-off squares and the appearance, a parameter value – the

"cross-cut rating" – is assigned.

Table1:

Compliance with the mean value must be ensured.

B. Measuring layer thickness

The layer must be measured at several points using a thickness gauge. The total layer

thickness must be between 150 µm and 190 µm when dry.

Expected value



1.4. Quality of assembly

In general, all screw connections must be tightened with a tested torque wrench.

1 Area of application

This section defines the tightening of screw connections with tightening torques when no other

tightening torques are specified on the design drawing. Certain characteristics must be

differentiated in this context.

Table 1 applies for:

- Standard threads according to DIN 13 T1

- Screws according to ISO 4014, ISO 4017, ISO 4762, (DIN 931, DIN 933, DIN 912)

- Contact areas dry

- Surface of the screw / nut blank or galvanized.




- Contact areas dry

- Surface of the screw / nut coated (Geomet 321 VL, Dacromet)


- Fine threads according to DIN 13 T2


- Contact areas dry

- Surface of the screw/nut blank or galvanized



- Screw with countersunk head

- Contact areas dry







- Contact areas dry

- Material stainless steel



- Screws according to ISO 4014, ISO 4017, ISO 4762 (DIN 931, DIN 933, DIN 912)

- Contact areas MoS2




2 Tightening torques

Table 1:



- Contact areas dry


Thr

ead

fric

tion

µ =

0.14

Dimension

Strength class screw/nut

5.6

[Nm]

8.8/8

[Nm]

10.9/10

[Nm]

12.9/12

[Nm]

M4 1.4 3.3 4.8 5.6

M5 3 6.5 9.5 11.2

M6 5 11.3 16.5 19.3

M8 27.3 40.1 46.9

M10 54 79 93

M12 93 137 160

M14 148 218 255

M16 230 338 395

M18 329 469 549

M20 464 661 773

M22 634 904 1057

M24 798 1136 1329

M27 1176 1674 1959

M30 1597 2274 2662

M33 2161 3078 3601

M36 2778 3957 4631

M39 3600 5100 6000

M42 4050 5700 6850

M45 5100 7150 8550

M48 6100 8600 10300

M52 7900 11100 13300

M56 9800 13800 16500

M60 12200 17200 20600

M64 14800 20800 24900

M68 18000 25200 30300



Thr

ead

fric

tion

µ =

0.12

Dimension


5.6

[Nm]

8.8/8

[Nm]

10.9/10

[Nm]

12.9/12

[Nm]

M4 1.2 3 4.6 5.1

M5 2.7 5.9 8.6 10

M6 4.7 10.1 14.9 17.4

M8 24.6 36.1 42.2

M10 48 71 83

M12 84 123 144

M14 133 195 229

M16 206 302 354

M18 295 421 492

M20 415 592 692

M22 567 807 945

M24 714 1017 1190

M27 1060 1496 1750

M30 1428 2033 2380

M33 1928 2747 3214

M36 2482 3535 4136

M39 3208 4569 5346

M42 3500 5000 5950

M45 4400 6220 7440

M48 5250 7400 8500

M52 6800 9550 11450

M56 8400 11800 14000

M60 10300 14600 17500

M64 12600 17700 21200

M68 15300 21500 2580



Table 2:



- Contact areas dry

- Surface of the screw/nut coated (Geomet 321 VL, D acromet)

Thr

ead

fric

tion

µ =

0.11

+/-

0.0

1

Dimension


8.8/8

[Nm]

10.9/10

[Nm]

12.9/12

[Nm]

M4 2.6 3.8 4.5

M5 5.2 7.6 8.8

M6 9 13 15

M8 21 32 38

M10 43 63 75

M12 75 108 128

M14 118 173 205

M16 182 270 315

M18 262 372 437

M20 370 525 615

M22 500 710 830

M24 635 900 1060

M27 930 1350 1570

M30 1270 1820 2120

M33 1700 2400 2900

M36 2200 3100 3700

M39 2850 4000 4800

M42 3500 4900 5900

M45 4400 6150 7350

M48 5250 7400 8900

M52 6800 9550 11450

M56 8400 11900 14200

M60 10500 14800 17700

M64 12700 17900 21500

M68 15500 21700 26000



Table 3:

- Fine threads according to DIN 13 T2


- Contact areas dry


Thr

ead

fric

tion

µ =

0.14

Dimension


8.8/8

[Nm]

10.9/10

[Nm]

12.9/12

[Nm]

M8 x 1 27 40 47

M10 x 1.25 54 79 93

M12 x 1.25 96 140 165

M12 x 1.5 92 135 155

M14 x 1.5 150 220 260

M16 x 1.5 230 340 390

M18 x 1.5 350 490 580

M20 x 1.5 480 690 800

M22 x 1.5 640 920 1070

M24 x 2 810 1160 1350

M27 x 2 1190 1700 2000

M30 x 2 1610 2300 2700

Thr

ead

fric

tion

µ =

0.12

Dimension


8.8/8

[Nm]

10.9/10

[Nm]

12.9/12

[Nm]

M8 x 1 26 38 45

M10 x 1.25 51 75 87

M12 x 1.25 90 133 155

M12 x 1.5 87 128 150

M14 x 1.5 142 209 244

M16 x 1.5 218 320 374

M18 x 1.5 327 465 544

M20 x 1.5 454 646 756

M22 x 1.5 613 873 1022

M24 x 2 770 1095 1282

M27 x 2 1120 1594 1866

M30 x 2 1556 2216 2600



Table 4:


- Screw with countersunk head

- Contact areas dry


Thr

ead

fric

tion

µ =

0.14

Dimension


5.6

[Nm]

8.8/8

[Nm]

10.9/10

[Nm]

12.9/12

[Nm]

M4 1.1 2.6 3.8 4.5

M5 2.4 5.2 7.6 9

M6 4 9 13.2 15.4

M8 22 32 37.5

M10 43 63.2 74.4

M12 74.4 110 128

M14 118 174 204

M16 184 270 316

Thr

ead

fric

tion

µ =

0.12

Dimension


5.6

[Nm]

8.8/8

[Nm]

10.9/10

[Nm]

12.9/12

[Nm]

M4 1 2.4 3.7 4.1

M5 2.2 4.7 6.9 8

M6 3.8 8 12 14

M8 20 29 33.8

M10 38 57 67

M12 67 98 115

M14 106 156 183

M16 185 242 283

For screws with a countersunk head, the required tightening torque is calculated based on 80%

of the corresponding screw with hexagon head (in this case 80% of the values from Table 1).



Table 5:



- Contact areas dry

- Material stainless steel

Dimension

A2/A4 strength class 70

µ = 0.12

[Nm]

µ = 0.14

[Nm]

M5 3.7 4.2

M6 6.4 7.3

M8 15.3 17.5

M10 31 35

M12 52 60

M14 83 94

M16 126 144

M18 174 200

M20 245 280

M24 235 270

M27 342 392

M30 467 536

For dry contact areas, use the indicated tightening torques under µ = 0.14.



Table 6:


- Screws according to ISO 4014, ISO 4017, ISO 4762 (DIN 931, DIN 933, DIN 912)

- Contact areas MoS2


Thr

ead

fric

tion

µ =

0.08

Dimension


8.8/8

[Nm]

10.9/10

[Nm]

12.9/12

[Nm]

M4 2.1 3.1 3.6

M5 4.2 6.1 7.2

M6 7.3 11 12

M8 17 25 30

M10 34 51 59

M12 59 87 100

M14 95 140 165

M16 145 215 250

M18 210 300 350

M20 300 420 490

M22 400 560 660

M24 510 720 840

M27 740 1050 1250

M30 1000 1450 1700



1.4.1. Screw connections and use of screw-locking e lements

For load-bearing screw connections , the following is defined:

• Since load-bearing screw connections must always be tightened to the required torque, these

torques are always indicated in the drawings.

• Load-bearing screw connections must also always be implemented with appropriate safeguards

against loosening.

• If the expansion length of the screw connection ≤ 3 x nominal diameter, screw-locking elements

by Nordlock are to be used.

• If the expansion length of the screw connection > 3 x nominal diameter, no screw-locking

elements by Nordlock are used.

• Existing designs or lists of items are maintained or modified in regard to inclusion of Nordlock

screw-securing elements only in exceptional cases.

• For particularly safety-relevant screw connections, the screws can also be glued.

• If the screws are glued, then this must be indicated on the drawing with the name and type of

glue used to secure the screw.

For non-load-bearing screws (e.g. for lighting holders, panels, etc.), the following is established:

• No Nordlock screw-securing elements are used.

• For screw connections in through-holes, DIN 125 washers and self-locking nuts are to be

provided.

• For screw connections for which no self-locking nuts may be used (e.g. blind holes), detent-

edged washers form M are to be used as the screw-locking elements.

Documents

Appendix Quality Assurance Agreement Steel structure · Quality Assurance Agreement ... ISO 9013 (replacement for DIN 2310 ... DIN EN ISO 9692 Weld preparation • Weld preparation