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
Specifications page69
S-BT Screw-in threaded studs
5.6 Resistance of S-BT fastenings under dynamic tensile
loading
ReportNo.XSEhac-01-15_06;HiltiAG;Schaan2015
General comments
Thetestswereperformedtoinvestigatetheeffectofrepeatedtensileloadson
theanchorageoftheS-BTfastenings.Therefore,WöhlerchartsforS-BTfastenings
havebeenevaluatedinviewoftheresistanceofvibrationsinaxialdirection
(repeatedtensileloads).
Test concept
TheS-BTfastenersweresubjectedtoaharmonicpulsatingtensileloading.
Theminimalloadoftheharmonicloadingwas0.2kNinalltests.Testswere
performedat4differentloadlevels.Theappliedmaximalloadswere1.8,3.6,4.5
and5.4kN.Testswerestoppedifnofailureoccurredwithin10millionloadcycles.
Asatestingfrequency50Hzwerechosen.
Thetestswereperformedontheupperapplicationlimitforthebasematerial
strength(EuropeanGradeS355withanultimatetensilestrengthf
u
=630MPa)in
combinationwithaminimumthreadintersectionof0.2mm.
Minimumthreadintersectionisdenedasthelowesttoleranceeldofthestud
threadengagementwiththebasematerial,ref.togureinsection0.
Test results
TestresultsoffatiguetestswithS-BTfasteners(1.4462)loadedwithharmonic
pulsatingtensileloads
TheintendedmaximumrecommendedtensileloadofS-BTfastenersinsteelS355
amountsto2.3kN(σ
max
=147N/mm
2
).Therefore,testswereperformedaround
thisloadtoassessthefatigueresistanceunderserviceloadconditions.Atlevel1
allsamplespassedtheloadlevelof1.8kN.Atthesecondlevel4outof5samples
passedtheloadlevelof3.6kN.
Consequently,highermaximalloadswereappliedtoincreasetheprobabilityof
failure.Atlevel3and4themajorityofthesamplesfailed.
InallteststhegoverningfailuremodewasfatiguefractureoftheS-BTstudorpull
outfromthebasematerial.
Principlesketchofcyclictensiontests
Base material
S-BT fastener
fatigue
loading
F
t
∆F
F
max
t
F
tension
F
min
0t
σ
max
σ
A
∆σ
σ
min
σ
mean