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 62 Specifications
5. PERFORMANCE
5.1 Nomenclature and symbols
Thesymbolsandnomenclatureusedinthetechnicaldataarelistedbelow.
Fastener test data and performance
NandV Tensileandshearforcesinageneralsense
F Combinedforce(resultingfromNandV)inageneralsense
N
s
andV
s
Tensileandshearforcesinadesigncalculation
F
s
Combinedforce(resultingfromN
s
andV
s
)inadesigncalculation
N
u
andV
u
Ultimatetensileandshearforcesthatcausefailureofthefastening,statistically,
the reading for one specimen
N
u,m
andV
u,m
Meanultimatetensileandshearforcesthatcausefailureofthefastening,statisti-
cally,theaverageforasampleofseveralspecimens
S Thestandarddeviationofthesample
N
r,k
andV
r,k
Characteristictensileandshearresistanceofthefastening,statistically,the5%
fractile.Forexample,thecharacteristicstrengthofafasteningwhoseultimate
strengthcanbedescribedbyastandardGausstypedistributioniscalculatedby:
N
R,k
=N
u,m
kxSwherekisafunctionofthesamplesize,nandthedesired
confidenceinterval.
N
rec
andV
rec
Recommendedmaximumtensileandshearloadsofthethreadedfastenertip:
N
rec
=
N
R,k
Ω
andV
rec
=
V
R,k
Ω
whereΩistheoverallfactorofsafety
M
rec
Recommendedelasticmomentforthefastenershank
M
rec
=
M
R,k
Ω
whereM
R,k
is the characteristic elastic moment resistance of the
threadedfastenertipandΩisanoverallfactoryofsafety.Unless
otherwisestatedontheproductdatasheets,theMrecvaluesin
thismanualincludeasafetyfactorof“1.75”forstaticloading.
N
R,d
andV
R,d
Design tensile and shear resistance of the fastening
N
r,d
=
N
R,k
γ
m
andV
r,d
=
V
R,k
γ
m
whereγ
m
is the partial factor of safety
T
rec
Recommendedtighteningtorque[Nmorlbft]
Fastening details
h
ef
Screw-indepthofthethreadedfastenertipbelowthesurfaceofthebasematerial
h
NVS
S-BTstudheadstand-offabovethesurfaceofthebasematerial
t
l
Thicknessofthefastenedmaterial
t
ll
Thicknessofthebasematerial
∑t
l
Totalthicknessofthefastenedmaterial(wheremorethanonelayerisfastened)
t
Nut
Thicknessoftheserratedflangenut
Characteristics of steel and other metals
f
y
Yieldstrengthofmetals[inN/mm
2
orMPa]
f
u
Ultimatetensilestrengthofmetals[inN/mm
2
orMPa]