Among the innovations in the Lighting sector, there's a trend to use lighter and thinner materials such as thin metal sheets, becoming a challenge for the assembly process and for the overall quality of the end LED lighting products. FASTITE®2000™ screws prevents stripping off problems and reduces the cycle time to increase the productivity of the assembly lines. At CELO we know how important it's to provide the right screw technology to and we've created a Case Study as an example of our fastening expertise.

1. FASTITE® 2000™ to SOLVE PROBLEMS in
thin metal sheet assemblies
Case study : LIGTHING market

2. Small Things Matter
OVERVIEW
One of our customers in lighting market contacted us for support on LED
drivers assembly to different lamp sets. He was having screw stripping
problems when tightening into thin sheet metal.
He was using non-licensed self-threading screws Ø4x8 mm, without under
head serrations, simple lead thread with standard F point.
The assembly process was semi-automatic: automatic feeding and driving
with manual positioning. He welcome any action to increase productivity in
the assembly lines, such us reducing cycle time and improving screw
alignment.
Final Product:
Modular LED lighting
Application:
LED driver fixation to thin metal
sheet
Assembly materials:
Lamp sets vary in materials and
thickness
Anodized aluminium sheet
White-lacquered steel sheet
Thickness of 0,5 - 0,8 - 1,0 mm
Installation process:
Automatic feeding and driving
Manual positioning
Main problem:
Stripping off
Application requirements:
Enough clamping force to prevent
loosening.
Images taken from our lab tests for non-disclosure agreement with our customer.

3. Small Things Matter
STRIPPING ISSUES:
PROBLEMS EVALUATION
POOR JOINT RELIABILITY:
Traces of steel remains between screw threads
after stripping.
0
0,05
0,1
0,15
0,2
0,25
0,3
0,35
0,4
0,45
0,5
1 2 3 4 5 6
Untighteningtorque(Nm)
Measurement of Untightening torque of 6 screws tightened at 1,5 Nm
Steel sheet 1mm thickness
Speed 5 rpm
Non-stripped parts showed low loosening
resistance. After transport, many LED drivers
weren’t properly clamped.
Plates were very sensitive to screw batch
conditions.
Scrap level was quite high. The estimated cost was
around 3.000 €/year.

4. Small Things Matter
SOLUTION PROPOSED: FASTITE® 2000™
As per issues detected, we proposed FASTITE® 2000™ screw:
• Increases stripping resistance due to its twin lead thread and serration configuration
• Improves vibrational loosening due to TRILOBULAR® section
• Licensed product with excellent stability between batches
Competitor screw 4x8
Steel sheet 1 mm thickness
Pilot hole Ø3,1 mm
Speed 250 rpm
0,0
0,5
1,0
1,5
2,0
2,5
3,0
3,5
0 1 2 3 4 5 6
Torque[Nm]
Time [s]
Stripping torque
FASTITE® 2000™ 4x7
0
0,1
0,2
0,3
0,4
0,5
0,6
0,7
1 2 3 4 5 6
Measurement of Untightening torque of 6 screws tightened at 1,5 Nm
Steel sheet 1mm thickness
Speed 5 rpm
Untighteningtorque(Nm)
Higher prevailing torque of FASTITE® 2000™
provides better loosening resistance.
Ta = Tightening torque
Ta Ta
Cycle time
Assembly torque
Safety margin

5. Small Things Matter
Note: Assembly process based on 1.200.000 screws / year
RESULTS
Additionally, FASTITE® 2000™ screw improves
productivity of the assembly line:
• Reduction of cycle time: Twin lead thread
provides double advance within 360º. Extruding CA
point ensures fast alignment and hole finding.
CONCLUSIONS
FASTITE® 2000™ screw solves assembly problems in thin
sheet metal and meets application requirements:
• Avoid stripping problems due to its twin lead
thread and serration configuration
• Improves resistance to vibrational loosening due
to TRILOBULAR® section
• Ensures a secure and stable assembly process due
to excellent dimensional stability between batches
(Licensed product)
Avoid Stripping risk
Stripping torque improved 40%
Reduce Loosening issues
Quality Improvement of final
product
Eliminate 3.000 € of scrap cost
No plates need to be discarded or
repaired
€
Save 330 h/year
Assembly time of the screw is
1 sec faster

6. Small Things Matter
FEATURES AND ADVANTAGES OF FASTITE® 2000™ SCREWS
Full threaded shank
Prevent clipping
Improved clockwise under head serrations
Increase friction during tightening
Excellent resistance to stripping
Improves electric conductivity
Radius profile™
Increase surface contact
High pull-out and loosening
resistance
EXTRUDING CA point
Allows entry into small pilot holes to
create self-extrusion and increase
length of engagement
Increase resistance to stripping
High pull-out resistance
Fast and easy alignment
TRILOBULAR® section
No tolerance between screw and nut member &
Reduces friction during threading
Resistance to vibrational loosening
Low threading torque
Pull-out resistance
Twin-lead thread
Larger thread contact (screw-nut member)
Perfect alignment to start straight
Increase resistance to stripping
Fast and safe assembly
Strong mechanical joint without risk of stripping.

7. Small Things Matter
Czech Republic,
Hungary & Slovakia:
www.celofasteners.comContact us
For further technical question, we provide the contact details of our Application Engineers:
Rest of Europe:
Petr Fohler
petr.fohler@celo.com
+420 703 865 304
Antoni Mongay
antoni.mongay@celo.com
+34 93 715 83 87
Mexico: Edson Ayala
edson.ayala@celo.com
+52 442 243 35 37
France: Alexandre Durdilly
alexandre.durdilly@celo.com
+34 93 715 83 87
Germany: Peter Jucknath
peter.jucknath@celo.com
+ 49 172 859 9770
Spain:
Bernat García
bernat.garcia@celo.com
+34 93 715 83 87
USA &
Canada:
Bernat García
bernat.garcia@celo.com
+34 93 715 83 87
South
America:
China: Kyle Zhang
engineering.cn@celo.com
+86 181 1567 5622
Kenny Xu
engineering3.cn@celo.com
+86 189 1580 3108
Derrick Zhang
engineering4.cn@celo.com
+86 150 5195 3877
Jaime Rodríguez
jaime.rodriguez@celo.com
+34 93 715 83 87
Bernat García
bernat.garcia@celo.com
+34 93 715 83 87
Other
countries:

8. www.celo.com
Small Things Matter