Product Overview
Microtech CR-40-3 Ultraminiature Coaxial Plug Components - Gold-Plated Brass, Unused NOS
Condition
Unused NOS. Evaluation: Visual inspection only. Function testing not performed. Gold-plated hex body, central contact pin, and black and red insulating sleeves present. Label on package reads part no. CR-403, qty 1. Sourced from a government research facility.
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Product Overview
Microtech, Inc. CR-40-3 subminiature coaxial RF connector - a loose component kit for terminating ultra-fine shielded coaxial cable with a threaded, gold-plated plug. Gold-plated brass body with hex fitting and barbed stem. Kit includes the threaded hex body, central contact pin, black insulating sleeve, and red insulating sleeve. Designed for applications where standard RF connectors like BNC, SMA, or TNC are far too large and heavy - medical transducers, custom laboratory sensors, avionics harnesses, and any micro-coaxial termination where size and signal integrity both matter.
Key Features
- Gold-plated brass hex body with threaded coupling for secure, vibration-resistant termination
- Barbed stem for cable retention on ultra-fine micro-coaxial cable
- Central contact pin included
- Black and red color-coded insulating sleeves included
- Subminiature form factor - incompatible with standard RG-58, RG-59, or RG-6 coaxial cable
- Incompatible with standard RF connectors (BNC, SMA, TNC) - matches Microtech subminiature receptacle series
- Requires precision micro-soldering tools and high-magnification loupe or stereomicroscope for assembly
Applications
- Biomedical technician terminating a custom physiological transducer cable after stripping ultra-fine coaxial line under a stereomicroscope - this kit provides the exact components to complete the assembly without sourcing parts separately
- R&D researcher fabricating a custom electrophysiology probe or implantable electrode array, manually terminating micro-coaxial lines at the sensor head to interface with lab data acquisition systems
- Avionics cable harness fabricator building high-density wiring for compact RF instrumentation where threaded connections resist vibration-induced loosening
- Hearing aid repair technician replacing a failed micro-miniature connector on a custom audio transducer assembly
- Maker or advanced hobbyist constructing a DIY bio-sensor rig or custom shielded micro-cable where commercial pre-molded options are not available in the required gauge or length
Frequently Asked Questions
What components are included in this kit?
The kit includes the threaded gold-plated brass hex body, one central contact pin, one black insulating sleeve, and one red insulating sleeve. No cable, receptacle, or tooling is included.
Is this compatible with standard coaxial cable like RG-58 or SMA connectors?
No. This connector is designed for ultra-fine micro-coaxial cable with jacket diameters well under standard sizes. It is incompatible with RG-58, RG-59, RG-6, and standard RF connectors including BNC, SMA, and TNC. It mates with Microtech's subminiature receptacle series.
What tools are needed to assemble this connector?
Precision micro-soldering tools, fine wire strippers, and a stereomicroscope or high-magnification loupe are required. Assembly is not suitable for standard bench soldering without magnification due to the subminiature scale of the components.
Is this a single connector kit or a bulk quantity?
The package label reads qty 1, indicating this is a single connector kit.
Microtech built connectors for the places where size was the whole constraint - nuclear diagnostics, nerve probes, hearing instruments. One of those ends up here, unused, waiting for the next custom cable that needs exactly this much connector and nothing more.
