SIST-TP CEN/TR 17603-32-23:2022

SLOVENSKI STANDARD
SIST-TP CEN/TR 17603-32-23:2022
01-september-2022
Vesoljska tehnika - Priročnik za pritrdilne elemente
Space engineering - Threaded fasteners handbook
Raumfahrttechnik - Handbuch zu Befestigungsschrauben
Ingénierie spatiale - Manuel de visserie
Ta slovenski standard je istoveten z: CEN/TR 17603-32-23:2022
ICS:
49.030.01 Vezni elementi na splošno Fasteners in general
49.140 Vesoljski sistemi in operacije Space systems and
operations
SIST-TP CEN/TR 17603-32-23:2022 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST-TP CEN/TR 17603-32-23:2022

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SIST-TP CEN/TR 17603-32-23:2022


TECHNICAL REPORT CEN/TR 17603-32-23

RAPPORT TECHNIQUE

TECHNISCHER BERICHT
June 2022
ICS 49.030.10; 49.140

English version

Space engineering - Threaded fasteners handbook
Ingénierie spatiale - Manuel de visserie Raumfahrttechnik - Handbuch zu
Befestigungsschrauben


This Technical Report was approved by CEN on 13 April 2022. It has been drawn up by the Technical Committee CEN/CLC/JTC 5.

CEN and CENELEC members are the national standards bodies and national electrotechnical committees of Austria, Belgium,
Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy,
Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Republic of North Macedonia, Romania, Serbia,
Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom.
























CEN-CENELEC Management Centre:
Rue de la Science 23, B-1040 Brussels
© 2022 CEN/CENELEC All rights of exploitation in any form and by any means
Ref. No. CEN/TR 17603-32-23:2022 E
reserved worldwide for CEN national Members and for
CENELEC Members.

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Table of contents
European Foreword . 15
Introduction . 16
1 Scope . 17
2 References . 18
3 Terms, definitions and abbreviated terms . 19
3.1 Terms from other documents . 19
3.2 Terms specific to the present document . 19
3.3 Abbreviated terms. 21
3.4 Variables . 22
3.4.1 Uppercase variables . 22
3.4.2 Lowercase variables . 24
3.4.3 Symbols . 25
3.4.4 Subscripts . 27
4 How to use the guidelines . 28
4.1 Introduction . 28
4.2 Procedure . 28
4.2.1 Stage 1 . 28
4.2.2 Stage II . 29
4.2.3 Stage III . 29
4.2.4 Stage IV . 30
4.3 Annexes . 30
5 General Fastener Analysis Guidelines . 31
5.1 Introduction . 31
5.2 Main Joint Categories . 31
5.2.1 Overview . 31
5.2.2 Concentric Axially Loaded Joints . 32
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5.2.3 Eccentric Axially Loaded Joints . 32
5.2.4 Shear Loaded Joints . 32
5.2.5 Combined Loaded Joints. 32
5.2.6 Low Duty Joints . 33
5.3 Joint Analysis Procedure . 37
5.3.1 Overview . 37
5.3.2 Margins of Safety . 37
5.4 Joint Geometry . 39
5.4.1 Fastener Geometry . 39
5.4.2 Thread Geometry . 40
5.5 Safety Factors . 43
5.5.1 Overview . 43
5.5.2 The Joint Fitting Factor . 43
5.6 References . 44
6 The Preload . 45
6.1 Overview . 45
6.2 Coefficient of Utilisation . 45
6.3 Theoretical Aspects . 46
6.3.1 The Relation between Torque and Preload . 46
6.3.2 Determining the Design Torque Level . 49
6.3.3 Locking Devices and Prevailing Torque . 51
6.3.4 Sources of Error . 53
6.3.5 Forces Induced by Thermal Fluctuation . 54
6.4 Mechanisms of Preload Loss . 56
6.4.1 Overview . 56
6.4.2 Embedding . 56
6.4.3 Fastener Group Interaction . 62
6.4.4 Gaskets . 64
6.4.5 Metallic Creep . 64
6.4.6 Washers . 64
6.4.7 Torsional Relaxation . 65
6.5 Margin of Safety on Tightening . 65
6.6 Worked Example . 67
6.7 References . 67
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7 Concentric Axially Loaded Joints . 68
7.1 Overview . 68
7.2 Joint Stiffness . 68
7.3 The Joint Diagram . 69
7.3.1 Overview . 69
7.3.2 Compressive Loading . 72
7.4 The Force Ratio . 73
7.5 The Compliance of the Fastener . 73
7.6 The Compliance of the Clamped Parts . 75
7.6.1 Overview . 75
7.6.2 Compression Zone Configurations . 76
7.6.3 Determining the Compression Zone Configuration . 79
7.6.4 The Compression Zone Compliance . 80
7.6.5 Gasket Compliance . 81
7.7 Calculation of the Loading Plane Factor . 83
7.7.1 Introduction . 83
7.7.2 Simple Calculation of the Loading Plane Factor . 87
7.7.3 Analytical Calculation of the Loading Plane Factor . 89
7.8 Joint Separation . 91
7.8.1 Introduction . 91
7.8.2 The Margin of Safety for Joint Separation . 92
7.9 Fastener Tensile Failure . 92
7.9.1 External Vs Overall Load. 92
7.9.2 Margin of Safety on Fastener Failure . 93
7.10 Thread Failure by Shear Pull-Out . 94
7.10.1 Introduction . 94
7.10.2 Failure of the Female Thread . 94
7.10.3 Failure of the Male Thread . 96
7.10.4 Margin of Safety on Thread Pull-Out . 96
7.11 Crushing of Flanges . 97
7.12 Repeated Loading to a Point above Yield . 97
7.13 Dynamic Loading . 99
7.14 Worked Examples. 100
7.14.1 Preload in a Concentric Axially Loaded Joint . 100
7.14.2 Thread Shear Pull-Out Example. 107
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7.15 References . 108
8 Eccentric Axially Loaded Joints . 109
8.1 Effects of Eccentricity . 109
8.1.1 Overview . 109
8.1.2 Prying. 112
8.2 Joints with Large Areas of Contact . 112
8.2.1 Compliance of the Clamped Parts . 112
8.2.2 The Joint Diagram . 117
8.2.3 The Force Ratio . 118
8.2.4 Loading Plane Factor . 118
8.2.5 The Interface Opening Limit . 119
8.2.6 Preload Considerations . 119
8.3 Cantilevered Flange Joints . 120
8.3.1 Overview . 120
8.3.2 Compliance of Circular Flanges . 120
8.3.3 Force Ratio for Circular Cantilever Flanges . 124
8.3.4 Simplified Joint Diagram for Eccentric Joints . 125
8.3.5 Joint Diagram for Eccentric NonLinear Joints . 125
8.4 Fastener Loads in Eccentric Joints . 126
8.4.1 Bending Moments . 126
8.5 References . 129
9 Shear Loaded Joints . 130
9.1 Introduction . 130
9.1.1 Overview . 130
9.1.2 Analysis Approach . 131
9.2 Friction Grip Joints . 132
9.2.1 Design Principles . 132
9.2.2 Slip Resistance . 134
9.2.3 Friction Grip Strength Analysis . 137
9.3 Bearing Joints . 138
9.3.1 Design Principles . 138
9.3.2 Fastener Shear Failure . 140
9.3.3 Net Tension Section Failure of FlangeS . 144
9.3.4 Hole Bearing Failure . 146
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9.3.5 Shear-Out or Tear-Out Failure . 150
9.4 Eccentrically Loaded Shear Joints . 151
9.4.1 Overview . 151
9.4.2 Fastener Group Centroid. 152
9.4.3 Bearing Design of Eccentric Shear Joints . 152
9.4.4 Friction Grip Design of Eccentric Shear Joints . 153
9.5 Worked Examples. 155
9.5.1 Shear Loaded Joint Example . 155
9.5.2 Net Tension Section Failure Example . 158
9.5.3 Eccentric Shear Bearing Joint Example . 159
9.6 References . 161
10 Low Duty Joints . 162
10.1 Introduction . 162
10.2 Low Duty Joint Design Guidelines . 162
10.2.1 Overview . 162
10.2.2 Insert Pull out Strength . 162
10.2.3 Joint Thermal Conductivity . 164
10.2.4 Joint Electrical Conductivity . 164
10.2.5 Handling Size . 165
10.2.6 Stiffness . 166
10.2.7 Tolerances . 166
10.2.8 Redundancy . 166
10.3 Non-Metallic Joints . 166
10.4 Low Duty Threshold . 167
10.5 Example: Low Duty Thermal Joint . 167
10.5.1 Overview . 167
10.5.2 Initial Assumptions . 169
10.5.3 Thermal Conductivity . 169
10.6 References . 170
11 Fatigue and Fracture Mechanics of Fasteners . 171
11.1 Introduction . 171
11.2 Fastener Fatigue . 171
11.2.1 Fundamentals . 171
11.2.2 Palmgren – Miner rule . 174
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11.2.3 Fatigue Design Principles. 174
11.3 Fundamentals of Fracture Mechanics . 176
11.3.1 The Stress Intensity Factor . 176
11.3.2 The Stress Intensity Correction Factor . 177
11.3.3 Crack Growth Calculations . 181
11.3.4 Corrosion Considerations . 181
11.4 Worked Examples. 181
11.4.1 Fatigue of a Threaded Fastener Example . 181
11.4.2 Threaded Fastener Fracture Mechanics Example . 182
11.5 References . 184
12 Preloded Fastener Installation . 185
12.1 Overview . 185
12.2 Yield Load Controlled Tightening . 185
12.2.1 Introduction . 185
12.2.2 Method of Operation . 185
12.2.3 Preload Developed in Fastener . 187
12.3 Angle of Rotation Controlled Tightening . 188
12.3.1 Introduction . 188
12.3.2 Elastic Range Tightening . 188
12.4 Ultrasonic Methods . 190
12.4.1 Introduction . 190
12.4.2 Ultrasonic Extensometers . 190
12.5 Direct Measurement . 193
12.5.1 Overview . 193
12.5.2 Method of Application and Practical Considerations . 194
12.6 Reuse of Fasteners . 194
12.6.1 Overview . 194
12.6.2 Effects on Friction Coefficients . 194
12.6.3 Effects on Prevailing Torques . 195
12.6.4 Recommended Practice for Fastener Resuse . 197
12.7 References . 197
13 Corrosion . 199
13.1 Overview . 199
13.2 Galvanic Corrosion . 201
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13.2.1 Introduction . 201
13.2.2 Factors Which Affect the Rate of Corrosion . 201
13.2.3 Prevention of Bimetallic Corrosion . 202
13.3 Stress Corrosion Cracking . 205
13.3.1 Introduction . 205
13.3.2 Factors Affecting Stress Corrosion Cracking . 205
13.4 Crevice Corrosion . 209
13.4.1 Introduction . 209
13.4.2 Methods of Avoiding Crevice Corrosion . 209
13.5 Pitting corrosion . 209
13.5.1 Introduction . 209
13.5.2 Alloy Susceptibility . 210
13.5.3 Prevention of Pitting Corrosion . 210
13.6 References . 210
14 Lubricants for Space Use . 211
14.1 Introduction . 211
14.2 Lubricant Selection . 211
14.3 Plating and Coatings for Fasteners . 212
14.4 Liquid Lubricants . 213
14.5 Dry Lubricants . 213
14.6 Codification of Space Lubricant Systems and Processes. 213
14.7 References . 214
15 Manufacturing Quality Control . 215
15.1 Introduction . 215
15.2 Manufacturing and Quality Assurance . 215
15.3 Quality of Threaded Fastener Joints . 215
15.3.1 Overview . 215
15.3.2 Process Variations . 216
15.3.3 Material Variations . 216
15.3.4 Tolerancing . 216
15.4 References . 217
16 Joint Validation by Testing . 218
16.1 Introduction . 218
16.2 Types of Testing . 218
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16.3 Development Testing . 218
16.3.1 Overview .
...