PennEngineering
microPEM™ Fastener Technology
Solving Assembly Challenges in Reduced Footprint Applications
© 2012
PENNENGINEERING Technical Services
• On-Site training.
• Comprehensive website includes complete
fastener 3D modeling capabilities.
• Trained field technical representatives
• Global testing laboratories.
• Cost Savings Investigations (C.S.I.).
• Prototype development.
• Installation solutions.
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PENNENGINEERING FASTENER
INSTALLATION METHODS
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Self-Clinching
Broaching
Surface mount
Weld
Flaring
Swaging
Inserts for plastics
Blind threaded rivet
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microPEM Fasteners Overview
A new family of solutions from
PennEngineering
© 2012
Why so small?
We actively conduct Product Teardowns and CSI reviews
for our customers. We have found in our analysis and
investigations that they often need smaller and smaller clinch
fasteners for thinner and thinner panels, to replace the adhesives,
rivets or welds they have been using. This is driving us to provide
more assembly options for when they are designing their next
product.
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What is the “micro” in
microPEM?
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Threads as small as M1.
Pin diameters as small as 1mm.
Standoff lengths as short as .040”/1mm.
Attach sheets as thin as .003”/0.08mm.
Clinching into sheets as thin as .012”/0.3mm.
Smaller products are in development.
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MPP - Micro Pin
• Satisfies micro positioning and
alignment requirements with pin
diameters as small as 1.0mm.
• Flush installation into materials as
thin as .020” / 0.5mm and as hard
as HRB 92 / HB 195, such as
stainless steel.
• Made from A286 - excellent
corrosion resistance.
• Chamfered end eases mating hole
alignment.
• RoHS compliant.
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Application Example
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Application Example
Phone: Pin used as a spring anchor.
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Self-clinching Micro Standoffs
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MSO4
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MSO4
• Thread sizes: M1.0, M1.2, M1.4, M1.6, #0-80, #2-56
• Made from 400 Series Stainless Steel
• Installs into materials with a maximum hardness of HRb 88
and as thin as 0.4mm / .016”
(0.3mm / .012” possible with modification – MTSO4)
• Lengths as short as 1mm or .04”
• Round, knurled head for close centerline to edge placement.
• RoHS compliant
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Application Example
Phone: Standoffs clinched into 0.4mm/.016” stainless.
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Application Example
Cell phone: M1.4 Standoff clinched into 0.43mm/.017”
stainless.
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Application Example
Cell phone: M1.4 Standoff welded onto 0.4mm/.016”
stainless.
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Application Example
Laptop: M2 standoffs clinched into 0.5mm/.020” stainless
heatsink mounting plate.
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Flaring Standoff-MSOFA
Camera: M1.6 standoffs flared into 0.2mm/.008” stainless
heatsink mounting plate.
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Micro SMTSO
• Thread sizes down to M1.
• Material choices: Brass,
Steel
• Bright or Matte Tin plated
• Sold Loose or Tape-AndReel
• Hex body for additional
strength
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Application Example
Laptop: M2 SMT nuts 1mm tall on PCB
2.5mm ID spacer
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SI® Brand Micro Inserts for Plastics
• Thread Sizes from M1.0
• Material choices: Brass,
Stainless Steel
• Style Choices:
Ultrasonic, Heat-Stake,
Molded-In, Press-In
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Do you use
micro screws?
1. Yes – only to hold an assembly together.
2. Yes – to allow for disassembly and reassembly.
We can offer two proprietary engineered solutions.
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Yes – to hold an assembly
together.
Solution = Micro TackPin
Patent Pending
© 2012
What are your costs to design in a screw?
(some may be costs of your fabricator, but that is included in their bid to you)
____ Cost of screw
+____ Cost of patch to prevent loosening
+____ Cost of threaded insert or tapped hole
+____ Cost of driver bits
+____ Cost of rework due to cross-threading
+____ Cost of rework due to driver bit “cam-out”
=____ Is this less than $10/k - $18/k ?
If not, than the smaller and stronger TackPin is the answer.
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microPEM™ TackPin™
• Intended for attaching two surfaces together, much the way a screw would.
The part clinches into the bottom member while retaining the top member
with a head.
• Tapered tip assists in assembly into the very small mounting hole.
• Interference band sizes hole during assembly to alleviate tolerance concerns.
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• What are the benefits to use a PEM® TackPin instead
of a screw ?
– The PEM® TackPin is stronger in pullout than the thread
strength of a screw of the same length.
– No risk of cross-threading.
– Eliminates risk of ‘cam-out’ bit damage.
– Less weight than a screw.
– Smaller than a screw, so designs can be thinner/smaller.
– No need for the cost of a nylon locking patch.
– Full metal contact for grounding/conductivity.
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• What are the process cost savings?
– Simplified assembly - press-in versus turned screw.
– Throughput is faster.
– No need to control, monitor and calibrate torque settings to
drive screws.
– No scrap costs due to cross-threading, over installation, or
screw breakage during assembly.
– If adhesives are used, a PEM® TackPin can be used without
any environmental or recycling concerns that adhesives can
cause.
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Laptop keyboard
Over 250 million patched M1.2 screw replacements in 2011 for this project.
Over 150 million more for two other projects.
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PCB to copper busbar
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360° metal contact
115 N min Pullout
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Do you use
micro screws?
1. Yes – only to hold an assembly together.
2. Yes – to allow for disassembly and reassembly.
We can offer two proprietary engineered solutions.
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Yes – to allow for disassembly
and reassembly.
Solution = licensed MTS® Screw
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54% reduction
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microPEM Fasteners
A new family of solutions from
PennEngineering
© 2012