HarcoSemco

HarcoSemco

HarcoSemco LLC

Branford, Connecticut, United States

Air SystemsRadar & SensorsMRO & LogisticsDual-use
Component Supplier, Subsystem ManufacturerSupplies Air Forces, Defense Industry
Profile last updated: August 2, 2026

About

HarcoSemco is a defense component supplier based in Branford, United States working in air systems, radar & sensors, mro & logistics.

HarcoSemco is an aerospace manufacturer of custom thermocouples, sensors, and cable harnesses for commercial, business, military jet, rotor, and spacecraft markets. The company designs and fabricates temperature, speed, and pressure sensors, probes, and interconnect harness assemblies for flight control, landing gear, environmental control, and engine systems. It also provides MRO services through FAA and EASA approved repair stations, supporting a range of engines and aircraft platforms. HarcoSemco has operations in Branford, Connecticut and Nogales, Sonora, Mexico, and states it has over 70 years of experience in the aerospace industry. It is an approved supplier to Boeing.

Location

Branford, United States

Legal name

HarcoSemco LLC

Focus areas

aerospacesensorsthermocouplescable harnessesMROtemperature sensorsspeed sensorsmilitary jetrotor

Languages

EN

Products & capabilities

Defense domains

Air SystemsRadar & SensorsMRO & Logistics

Supply-chain role

Component SupplierSubsystem ManufacturerMRO & Services

What they offer

HardwareComponentsMaintenance & RepairEngineering ServicesManufacturing Services

Markets

Also sells to civilian markets

Products

Variable Reluctance Speed Sensors

Speed sensor

Magnetic sensors that measure the position and speed of moving ferrous objects, including jet engine turbine speed.

Total Air Temperature Sensors

Air temperature sensor

Sensors that measure impact air temperature, accounting for friction and compression effects in high-speed flight.

Outside Air Temperature Sensors

Air temperature sensor

Sensors that measure ambient air temperature with platinum sensing elements for aircraft operations.

Rigid Thermocouple EGT Rake

Thermocouple assembly

Exhaust gas temperature rake assembly for engine temperature monitoring.

Thermocouple Probes

Temperature probe

Custom thermocouple probes for aerospace temperature measurement.

Weapon Harnesses

Cable harness

Custom cable harnesses for weapon systems.

Ejection Seat Module

Ejection seat component

Sensor and harness module for ejection seat applications.

Aerial Refuel Cable Harnesses

Cable harness

Cable harnesses for aerial refuelling systems.

Rescue Hoist Cable Harnesses

Cable harness

Cable harnesses for rescue hoist systems.

Flight Control Harnesses

Cable harness

Harnesses for flight control systems, including landing gear and environmental control applications.

End users

Air ForcesDefense Industry

Credentials & affiliations

Certifications

FAA Air Agency Certificate

EASA Certificate

Nadcap Welding Certificate

DNV ISO certificate

Other defense companies in United States

View all