General-purpose coaxial feedthrough for applications where impedance control or high voltage is not required. Available in single-ended BNC or double-ended BNCD configurations. CF16 flanges support 1 unit; CF40 flanges accommodate up to 4 units. Custom flanges and weldable versions are available. Features grounded shielding with non-fixed impedance matching. Single-ended BNC uses a 2.4 mm conductor, while BNCD uses BNC connectors at both ends. Rated at 500 VDC max, 3 A. Operates from -200°C to 450°C under UHV (<1×10⁻¹⁰ mbar). Optional dual-end connectors and cables are available.
Features
· General-purpose coaxial feedthrough for applications not requiring impedance control or high voltage.
· Available in single-ended BNC or double-ended BNCD configurations.
· One unit fits on a CF16 flange; up to 4 units on a CF40 flange.
· Multiple feedthroughs can be welded onto larger flanges.
· Optional connectors and cables available for both ends.
· Custom flange and feedthrough configurations available upon request.
Parameters
Specification |
Shielding Type | Grounded Shielding |
Impedance Matching | Non-fixed |
Conductor Diameter | Single-ended: 2.4 mm Double-ended: BNC connector |
Maximum Voltage | 500V DC |
Maximum Current | 3A |
Temperature Range | -200°C ~ 450°C |
Ultimate Vacuum | <1×10⁻¹⁰ mbar |
Leak Rate | <1×10⁻¹² Pa·m³/s (He) |
Dimensions

CF Flange Selection Table |
| Flange | Number of Feedthroughs | Single-ended BNC Feedthrough | Double-ended BNCD Feedthrough |
| CF16 | 1 | MT140-BNC-C16 | MT140-BNCD-C16 |
| CF40 | 1 | MT140-BNC-C40 | MT140-BNCD-C40 |
| CF40 | 2 | MT140-BNC-C40-2 | MT140-BNCD-C40-2 |
| CF40 | 3 | MT140-BNC-C40-3 | / |
| CF40 | 4 | MT140-BNC-C40-4 | / |
KF Flange Selection Table |
| Flange | Number of Feedthroughs | Single-ended BNC Feedthrough | Double-ended BNCD Feedthrough |
| KF16 | 1 | MT140-BNC-K16 | MT140-BNCD-K16 |
| KF40 | 1 | MT140-BNC-K40 | MT140-BNCD-K40 |
| KF40 | 2 | MT140-BNC-K40-2 | MT140-BNCD-K40-2 |
| KF40 | 3 | MT140-BNC-K40-3 | / |
| KF40 | 4 | MT140-BNC-K40-4 | / |
Note: For other flange and feedthrough combinations, please contact us. |
Weldable Version Selection Table |
| Number of Feedthroughs | Single-ended BNC Feedthrough | Double-ended BNCD Feedthrough |
| 1 | MT140-BNC-WV | MT140-BNCD-WV |
Related Accessories |
Type | BNC Coaxial Feedthrough | BNCD Coaxial Feedthrough |
| Vacuum-side Connector | MT160-PPOC-2.4 MT160-CRFC-2.4 MT145-CON-SBNC-VAC | MT145-CON-BNC-VAC |
| Vacuum Cable | MT165-PTFE50 Coaxial Cable MT165-KAP50 Coaxial Cable MT165-KAPM Series |
| Vacuum-side Connector + Cable | MT145-SBNC-FX-PTFE50-500-VAC | MT145-BNC-MX-PTFE50-500-VAC |
| Air Connector | MT145-CON-BNC-AIR |
| Air-side Connector + Cable | MT145-BNC-MX-500-AIR |