Naperville, Illinois  ·  Founded 1989  ·  35+ Years

Wire Harness
& Cable
Fabrication

Electromechanical components and assemblies built to the most demanding quality standards. From prototype to full production — one accountable partner.

Our Capabilities Request a Quote
1989
Founded
35+
Years Manufacturing
50+
Employees
100%
In-Process Testing
IATF 16949 Certified
ISO 9001 Certified
ISO 14001 Certified
IPC/WHMA-A-620 All Staff Certified
AS9102C Compliant
CAGE Code: 8GFS4
Zero-Defect Manufacturing
IATF 16949 Certified
ISO 9001 Certified
ISO 14001 Certified
IPC/WHMA-A-620 All Staff Certified
AS9102C Compliant
CAGE Code: 8GFS4
Zero-Defect Manufacturing
Who We Are

Precision Built.
Proven Performance.

SMT LLC is a U.S.-based manufacturer of electromechanical components and assemblies, with primary emphasis on wire harness fabrication, cable assemblies, and electromechanical contract manufacturing.

Founded in 1989 in Naperville, Illinois, we serve automotive, commercial, and industrial sectors with a vertically integrated approach — DFM support, wire processing, assembly, and 100% in-process testing under one roof.

Now expanding into aerospace and defense with AS9100-aligned quality systems and AS9102C First Article Inspection compliance.

Automotive Aerospace Defense Industrial Commercial
35+
Years of Excellence
Continuous operation and customer relationships spanning decades of demanding programs.
50+
Skilled Employees
All manufacturing and quality personnel IPC/WHMA-A-620 certified.
100%
In-Process Testing
No sampling on critical characteristics. Every unit tested before shipment.
4
Major Certifications
IATF 16949, ISO 9001, ISO 14001, and IPC/WHMA-A-620. AS9100 in progress.
What We Build

Full-Spectrum
Capabilities

From single circuits to complex multi-branch harness systems. Prototype through full production — SMT is your one accountable partner.

Wire Harness & Cable Fabrication
Full-spectrum capability from 30 AWG to 1,000 MCM. Low voltage and high voltage capable. Custom and standard termination options.
30 AWG → 1000 MCM
Automated Wire Processing
Cut, strip, and terminate to precise tolerances. 100% cut and strip monitoring prevents core damage on every wire, every cycle.
100% Monitoring
Electromechanical Assembly
Comprehensive contract manufacturing with design input and vertical integration. Component sub-assembly, PCB integration, and functional testing.
Turnkey Solutions
Precision Crimping
100% in-line crimp force monitoring. Out-of-spec force triggers immediate line stop. Conductor cross sections performed on every setup.
100% Crimp Force Monitored
Design for Manufacturability
Early supplier involvement in DFM review. Engineering collaboration from prototype through production. Reducing cost and improving reliability from day one.
Prototype → Production
Automated Circuit Testing
100% continuity and short circuit testing via guided assembly boards. Pull force testing on every assembly. Every circuit verified before shipment.
Zero Escapes
Capabilities
Coil Winding
Resistance Welding
Ultrasonic Welding
Insert Molding
Overmolding
Heat Shrink Processing
EDI 830 & 866
Just-In-Sequence Delivery
Smart Harness Assembly Boards
PCB Integration
Custom Packaging & Labeling
Coil Winding
Resistance Welding
Ultrasonic Welding
Insert Molding
Overmolding
Heat Shrink Processing
EDI 830 & 866
Just-In-Sequence Delivery
Smart Harness Assembly Boards
PCB Integration
Custom Packaging & Labeling
Precision Built.
Every Connection.

From 30 AWG signal wire to 1,000 MCM power cable — every termination monitored, every circuit verified.

Zero-Defect Culture

Quality & Testing

100% inspection and testing built into every production process. No sampling on critical characteristics. Every part verified before it leaves our facility.

01
In-Line 100% Crimp Force Monitoring
Every crimp monitored in real time. Out-of-spec force triggers immediate line stop and operator alert. No exceptions.
02
100% Cut and Strip Monitoring
Sensor-based conductor detection during incision and strip. Blades never contact conductor material — core damage eliminated on every wire, every cycle.
03
Conductor Cross Sectioning
Offline inspection performed every time a terminal and wire combination are set up. Crimp geometry confirmed to specification before production begins.
04
Pull Force Testing
Every crimp assembly pull-force tested to specification at set-up and in-process. Go/no-go result recorded. No exceptions.
05
Automated Circuit Testing
100% continuity and short circuit testing via guided assembly boards at end of line. Every circuit verified before shipment.
06
VDA Quality Familiarity
VDA quality requirements supporting automotive Tier 1 and Tier 2 programs. EDI 830 and EDI 866 capable for seamless supply chain integration.
100%
Crimp Force Monitored
100%
Cut & Strip Monitored
100%
Pull Force Tested
100%
Circuits Verified
Markets Served

Industries We Serve

🚗
Automotive
OEM and Tier 1 supplier programs. IATF 16949 certified. VDA familiar. EDI 830/866 capable.
✈️
Aerospace & Defense
AS9102C compliant. CAGE Code 8GFS4. Embraer Phenom programs. AS9100 in progress.
⚡
Commercial & Industrial
Custom electromechanical assemblies for demanding commercial and industrial applications.
🔋
Electric Vehicles
High voltage cable assemblies, HV harnesses, and battery interconnect systems for EV platforms.
Compliance & Standards

Certifications & Compliance

Registered and certified to the most demanding quality management standards in manufacturing.

IATF 16949
Automotive Quality
Management System
Perry Johnson Registrars
ISO 9001
Quality
Management
System
ISO 14001
Environmental
Management
System
IPC/WHMA A-620
All Staff Certified
CIT Certified
Engineering Manager
AS9100
Currently AS9102C
Compliant · CAGE 8GFS4
Certification In Progress
Let's Build Something

Get In Touch

📍
Address
2768 Golfview Drive
Naperville, Illinois 60563 USA
📞
✉️
🕐
Hours
Monday – Friday: 8:00 AM – 5:00 PM CT
👤
General Manager
Mathias Buchmann
m2buchmann@smtllcgroup.com