S-BT Threaded Fastener Specification
Table Of Contents
- 1.1 Definition
- 1.2 The S-BT system
- 1.3 Fastening mechanism
- 1.4 S-BT system features and benefits – simplified fastening to steel
- 2.1 Grating fastening system
- 2.2 Grating fastening system X-FCS-R
- 2.3 S-BT with MM and MQ installation channel system
- 2.4 Fastening instrumentation, junction boxes and lighting
- 2.5 Fastening cable / conduit connectors
- 2.5 Fastening cable tray supports
- 2.7 Electrical connections
- 3.1 Product data
- 3.2 Load data
- 4.1 Instruction for use - S-BT-MF M6, M8, M10, W6, W10
- 4.2 Instruction for use - S-BT-MF M8/7 AN 6
- 4.3 Instruction for use - S-BT-MR M6, M8, M10, W6, W10 SN 6
- 4.4 Instruction for use - S-BT-MR M8/7 SN 6
- 4.5 Instruction for use - S-BT-MR M6, M8, M10, W6, W10 SN 6 AL
- 4.6 Instruction for use - S-BT-MR M8/7 SN 6 AL
- 4.7 Instruction for use - S-BT-GF M8/7 AN 6
- 4.8 Instruction for use - S-BT-GR M8/7 SN 6
- 4.9 Instruction for use - S-BT-GR M8/7 SN 6 AL
- 4.10 Instruction for use – S-BT-EF M6/W6/M8
- 4.11 Instruction for use – S-BT-EF M10/W10
- 4.12 Instruction for use – S-BT-ER M6/W6/M8
- 4.13 Instruction for use – S-BT-ER M10/W10
- 4.14 Instruction for use – S-BT-EF W10 HC AWG2/0 and S-BT-EF M10 HC 35/120
- 4.15 Instruction for use – S-BT-ER W10 HC AWG2/0 and S-BT-ER M10 HC 35/120
- 5.1 Nomenclature and symbols
- 5.2 Design concepts
- 5.3 Static capacity of the S-BT threaded stud
- 5.4 Vibration effects on S-BT threaded stud fastenings
- 5.5 Resistance of S-BT fastenings under dynamic tensile loading
- 5.6 Effect of S-BT threaded stud fastenings on the fatigue strength of base material structural steel
- 5.7 Influence of glue coatings on the loosening torque
- 5.8 S-BT-ER and S-BT-EF screw-in threaded studs for electrical connections
- 5.9.5 Conductivity disc of S-BT-ER / -EF electrical connectors
- 5.9.4 Stainless steel S-BT studs
- 5.9.3 Carbon steel S-BT studs
- 5.9.2 Galvanic (contact) corrosion
page 70 Specifications
Asoftendoneinfatiguedesign,thecharacteristicresistanceΔσ
k
(=5%-fractile
or95%probabilityofsurvival)isassessedbyreducingthelinearregressionwith
thedoubleofthestandarddeviation“s”ofthetestdata.“s”correspondstothe
standarddeviationofthedifferencebetweenthetestresultsandthemeantrend.
Applyingthisprocedure,thecharacteristicfatiguestrengthdeterminesto:
log N
k
=9.8626–1.8396*logΔσ
k
Characteristic cycle life N
k
attensionserviceloadlevelN
rec
Conclusions
•Thevaluesgiveninthetablecanbeusedforfatiguedesignofthestainlesssteel
S-BTfastenersinsteelgradeS355 / Grade50.
•Incasefatiguedesignwithhigherloadcyclesbeyond1´175´000cyclesis
required,thecharacteristicfatiguedesigncurve(Reg.–2s)canbeconservatively
used.
•TheresultspresentedallowtheuseofS-BT-fastenersinapplications,wherewind
suctionisinvolvedortocovermanytypical“dynamic”partsofinprinciplestatic
workingloads.
•Ifhighcyclefatiguedesignisnecessary,thecorrespondingcharacteristicscanbe
usedtoassesstheprinciplesuitabilityofS-BTfastenersforthespecicpurpose.
Nevertheless,highcyclefatiguedesignisbeyondthescopeoftheS-BTfasteners.
Notes
•Incaseofstaticloading,sufcientredundancyoftheentirefasteningmustbe
provided.
•Thevaluesstatedapplyforaxialtensileloading.Theconstructivedetailhasto
becheckedwithregardstothiscondition.Ifbendingstresses–forexampledue
toimperfections–mightoccur,thesehavetobeconsideredinfatiguedesign.
Imperfectionswillleadtoareductionofthecharacteristiccyclelives.
•Thepartialsafetyfactorsforfatigueactionsaswellasfatigueresistancehaveto
beconsideredaccordingtofatiguedesignprovisions(forexample:Eurocode4or
AISC-LRFD)inagreementwiththestatisticalevaluationofN
k
.
•Ifglobalsafetyconceptsareapplied,theglobalfactorsofsafetyhavetobetaken
inagreementwiththestatisticalevaluationofN
k
meeting the conditions of the
useddesignstandard.
Thissummaryisintendedtoberepresentativeofthetest(s)carriedout.Itisnotintendedtobeafulland
complete test report.
Linear regression of fatigue test results
HiltiS-BTfasteningsystemundercyclic
loading