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Fastening technology for metals and plastics

Fastening technology for metals and plastics - SFS Group · Fastening technology for metals and plastics. dd ... fastening in materials with low ... Testing serviceability in the

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Page 1: Fastening technology for metals and plastics - SFS Group · Fastening technology for metals and plastics. dd ... fastening in materials with low ... Testing serviceability in the

Fastening technology for metals and plastics

Page 2: Fastening technology for metals and plastics - SFS Group · Fastening technology for metals and plastics. dd ... fastening in materials with low ... Testing serviceability in the

d dD1 D2

SFS intec AG, Automotive, [email protected]

for metals

Thread forming screws

Special designs

�� for�easy�location�of�the�borehole�� for�centring�offset�boreholes

��mechanical�loss�prevention�(e.g.�during�shipping)

The�captive�point�secures�the�screw�mechanically�against�loss�after�thread�forming.�Removal�is�only�possible�by�destroying�the�internal�thread.

TAPTITE 2000®(M1– approx.�M10)

Both�TAPTITE�2000®�and��EXTRUDE-TITE®�2000™�have�an�optimised�Radius�Profile™�at�their�thread�flanks.�This�results�in�multiple�advantages:

�� higher�pre-tensioning�strength�with�very�little�scatter�� low�insertion�torque�� optimised�thread�forming

for metals and plastics

for plastics

�� for�direct�fastening�in�thermoplastics�� no�threaded�inserts�necessary�� excellent�fastening�values

�� hammer�in�the�fastener�–�it�holds!�� fast�and�secure�installation�� can�be�unscrewed�for�servicing�and�recycling

REMFORM®II™ "F"(∅1,4�–�∅8)

for light-gauge sheetsEXTRUDE-TITE®�2000™�permits�easy�centring�and�forming�of�the�through-hole�in�a�single�operation.

�� no�need�for�prior�forming�of�extruded�hole�in�stamped�part�� high�load-bearing�capacity�of�the�thread�� low�space�requirements�due�to�short�centring�point

EXTRUDE-TITE® 2000™(M2– approx.�M8)

REMFORM®II™(∅0,5�–�∅8)

PUSHTITE®II™(∅1�–�∅6)

�� optimised�for�direct�fastening�in�reinforced�and�highly�reinforced�thermoplastics

REMFORM®II™ "HS"(∅2�–�∅8)

PU

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thermoplastics � �

reinforced�thermoplastics � � �

highly�reinforced�thermoplastics � �

die-cast�magnesium �

die-cast�zinc �

die-cast�aluminium �

steel �

thin-gauge�sheets �

Radius�Profile™�thread

The�TAPTITE�2000®�allows�chipless�thread�forming�during�the�fastening�process.�It�is�characterized�by�low�insertion�torque�and�high�pre-tensioning�strength.�The�cone�shaped�thread�tip�optimises�the�setting�of�the�screw.

�� TRILOBULAR®�thread�profile�� savings�due�to�optimised�processes�� safe�and�reliable�fastening

Radius Profile™

�� fastening�in�materials�with�low�ductility�(magnesium,�zinc�and�aluminium�alloys)�� for�highly�reinforced�thermoplastics�� low�deformation�� good�fastening�values�� low�chip/sliver�formation

Range of application

�� very�suitablelimited�suitability

Centring point�(CA�point) Loss protection�(Captive�Point)D1�>�d�>�D2

Page 3: Fastening technology for metals and plastics - SFS Group · Fastening technology for metals and plastics. dd ... fastening in materials with low ... Testing serviceability in the

100

90

80

70

60

50

40

30

20

10

0 500 1000 1500 2000 2500

SFS intec AG, Automotive, [email protected]

Options

Stop teeth�� increases�over-tightening�torque�(see�page�7)�� robust�fastening�� especially�suitable�for�light-gauge�sheets�or�other�low-strength�materials

Power drives�� TORX�PLUS®�drive�system�� TORX®

�� cross�slot�� camera�cross�recess�� one-way�and�safety�drives�� combinations�of�different�drives

Coloured fastener heads�� powder�or�spray�coating�according�to�colour�specification�� PVD�coating

Pre-assembled auxiliary elements

�� captive�washers�� parts�ready�for�installation�� no�additional�operations�� suitable�for�automated�assembly�� e.g.�also�for�terminal�screws

spedseal®�(∅ 1,4�–�∅ 22)�� under-head�sealing�� insulation�of�electrically�conducting�zones�� sounds�insulation�of�metallic�contacts�� different�degrees�of�hardness�starting�from�50�shore�A�to�75�shore�D�(depending�on�the�desired�function)

Cup point�� electrical�contact�� no�subsequent�shifting�of�the�components�� splash-proof�connection�� can�be�combined�with�fins�to�exploit�the�advantages�of�stop�teeth�at�the�same�time

100% inspection of attributes��max.�defect�rate�reduced�from�<150�ppm�to�0–3�ppm�� reduced�downtimes�of�cost-�intensive�assembly�lines�� higher�productivity�� higher�functional�reliability�of�the�finished�product

Special materials�� stainless�steel�materials�(A2/A4)�� light/non-ferrous�alloys,�nickel�plated,�copper-plated,�tin-plated,�alkali�blacked�or�painted

mechanical chemicallynon-reactive (clamping)

chemically reactive(adhesive)

Resistance against loosening

POWERLOK®�� attached�30°�point�� used�in�tapped�threads�� functions�irrespective�of�temperature�� TRILOBULAR®�thread�cross�section

TAPTITE 2000®�� fits�free�of�play�in�female�thread�� TRILOBULAR®�thread�cross�section�creates�easy�positive�lock

TAPTITE 2000® + spedcaps®�� combines�the�advantages�of�thread�rolling�and�high�loosening�resistance

spedcaps®�� high�loosening�resistance��micro-encapsulated,��2-component�liquid�adhesive�� applied�ready�for�insertion�� good�seal�up�to�400�bar�� complies�with�DIN�267,�Part�27

spedlack®�� as�adjusting�screw�� loss-proof�pre-assembly�� for�multiple�re-use

spedstop®�� spot�or�all-round�coating�� high�loosening�values�� for�multiple�re-use�� complies�with�DIN�267,�Part�28

Comparative loosening resistance

Tested�on�the�SFS�intec�transverse�load�test�device�(test�with�M5�screw�size)

internalthread

Sophisticated screw geometry�� screws�with�double�threads�� shoulder�screws�� special�heads�� integration�of�additional�functions�into�the�fastener

�� TAPTITE�2000®,�EXTRUDE-TITE®�2000™�� POWERLOK®

�� spedstop�®

�� spedlack�®

�� unsecured

Number�of�load�cycles�[n]

Initi

al�s

tres

sing

�for

ce�[%

]

�� TAPTITE�2000®�combined�with�spedcaps�®

�� spedcaps�®

Page 4: Fastening technology for metals and plastics - SFS Group · Fastening technology for metals and plastics. dd ... fastening in materials with low ... Testing serviceability in the

SFS intec AG, Automotive, [email protected]

Fastener materials & surface finish

Material properties of the fasteners

The�values�in�the�tables�above�are�established�guideline�values�for�an�M6x25�fastener�with�a�5�μm�or�8�μm�thick�anti-�corrosion�coating.�Corrosion�resistance�varies�with�component�size�and�geometry.

Fitting recommendation

Recommendations �max. tightening torque•� min.�30%�less�than�failing�torque�

(slightly�less�than�max.�clamping�force)

•� max.�90%�utilisation�of�yield�point

� to increase failing torque stop�teeth�(greater�difference�between�insertion�TI�and�failing�torque�TF�⇒ fitting�security)

� insertion speed for plastic�approx.�500�to�700�rpm�(melting�may�occur�at�higher�speeds)

Case hardening steel

��min.�surface�hardness�450�HV�� core�hardness�300–350�HV

The�tensile�strength�of�these�fasteners�is�at�least�900�N/mm²,�i.e.�it�corresponds�at�least�to�a�9.8�screw.

Yield�strength�is�approx.�90%�of�tensile�strength.�Elongation�at�break�is�in�the�range�of�10.9�to�12.9�screws.

Threads�can�be�generated�in�base�materials�up�to�150�HB�(500�N/mm²).

Heat-treatable steel

�� 8.8,�9.8,�10.9�and�12.9�qualities

Used�in�applications�with�dynamic�loads�combining�tensile�stress�and�bending�stress.

Threads�can�be�generated�in�base�materials�up�to�120�HB�(400�N/mm²)��(possibly�higher�if�special�steps�are�taken).

Stainless materials

��A2-70/A4-70�� thread�forming�for�base�materials�up�to�300�N/mm²�(possibly�higher�if�special�steps�are�taken)

Aluminium/Titanium

�� for�special�applications

failing�torque�TF�with�stop�teeth�option

failing�torque�TF

max.�tightening�torque�TT

insertion�torque�TI

min.�30%�of�failing�torque

through�hole

blind�hole

angle�of�rotationclamping�force

torq

ue

insert tighten failing

Thread�forming,�failing�and�loosening�torque,�as�well�as�friction�behaviour�or�initial�stressing�and�pull-out�forces�are�measured�based�on�requirements.�On�the�basis�of�the�results,�we�make�appropriate�recommendations�for�optimum�use.�The�tests�are�preferably�performed�with�original�components�from�customers.

Electroplated surfaces Zin

c co

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Bas

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AppearanceZinc�and�blue�passivation 8 48 72 iridescent�blue

Zinc�and�thick�film�passivation 96 168 264 iridescent

Zinc�and�blue�passivation�with�spedacor�® 240 360 480 silver

Zinc�and�thick�film�passivation�with�spedacor�® >�240 >�360 >�480 iridescent�silver

Zinc-iron�black�passivation�and�sealing 72 240 360 black

Zinc-iron�and�thick�film�passivation 120 360 480 highly�iridescent

Zinc-nickel�and�thick�film�passivation >�120 >�480 >�600 iridescent

Zinc-nickel,�thick�film�passivation�and�spedacor�® 300 600 720 titanium�silver

Zinc-nickel,�black�passivation�and�sealing 240 >�600 720 black

Non-electrolytically deposited surface systems (3 layer) AppearanceZinc�flake�systems 480 blackZinc�flake�systems 720 silvery�grey

Testing serviceability in the SFS intec laboratory

Salt spray testing to DIN EN ISO 9227

Salt�spray�tests�are�performed�inhouse�in�our�DIN�EN�ISO�17025�accredited�laboratory.�Excellent�results�have�been�obtained�with�zinc,�zinc�alloy�and�zinc�flake�systems.�An�additional�sealing�coat�such�as�spedacor�®�can�further�extend�the�corrosion�resistance�where�necessary.

Corrosion resistance after salt spray testing

Page 5: Fastening technology for metals and plastics - SFS Group · Fastening technology for metals and plastics. dd ... fastening in materials with low ... Testing serviceability in the

Turn ideas into reality.

SFS�intec�Inc.� Tel� +1�330�239�71005201�Portside�Drive� Fax�+1�330�239�7190US-Medina� [email protected]�44256� www.sfsintec.biz

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Consultancy and Sales:

Cross location expertise

Flexibility�and�economy�are�our�bywords�at�SFS�intec,�throughout�our�international�network�of�facilities.�We�manufacture�our�products�in�various�plants�across�three�continents.

We�maintain�a�continuous�knowledge�exchange�process�beyond�company�boundaries�and�national�frontiers.�It�is�the�merging�and�ongoing�development�of�technological�know-how�which�creates�the�critical�synergy.�That's�why�we�are�always�able�to�communicate�and�convey�a�state-of-the-art�knowledge�base�in�our�technologies.

Discover our comprehensive product portfolio

SFS�intec�has�over�50�years�of�experience�in�fastening�technology.�We�will�be�glad�to�offer�you�a�solution�that�meets�your�demands.�See�our�extensive�brochures�for�further�information.�You�can�request�them�if�you�need�more�details.

Feel�free�to�contact�us�anytime.�We�will�be�pleased�to�assist�you.

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