VBDD Series O-Ring Sealed High Vacuum (KF) Feedthroughs

Our VBDD series feedthroughs are equipped with shaft which passes all the way through the assembly and is sealed by elastomer O-rings. They are available on KF and ISO flanges.  They are capable of full continuous 360º rotation and can be optionally manually-operated or driven by 2 phase stepper motor.

Key Features


  • Base flange sizes KF16-KF40, ISOK100. CF flanges available by special request
  • Manual or motorised options
  • For stepper motor versions we offer 3 types of stepper motor, NEMA17, NEMA 23 or NEMA34 . NEMA17 is a cheaper, more compact and lower maximum torque solution than NEMA23. NEMA34 is the largest motor with the highest torque for the ISO version.
  • Motor options with handwheel at the rear of the motor for manual operation
  • Operating temperature up to 50ºC
  • Bakeout up to maximum 110ºC (motor must be removed from motorised version)
  • Pressure range 1bar – 1-10-9 mbar
  • Direct drive (shaft passes all the way through)
  • Viton® sealed
  • Service life 20,000,000 revolutions
  • Material: 304L stainless steel
Part No.Flange sizeMotor typeMotor torque (Nm)Max. transferrable torque (Nm)Max. Rotation Speed (U/min)Weight (kg)Shaft Size (mm)Shaft radial load capacity (N)Shaft axial load capacity (N)
VBDD16KF16None/ManualNone1.515000.156030
VBDD16+
VBDD25KF25None/ManualNone610000.2815060
VBDD25+
VBDD40KF40None/ManualNone258000.712250250
VBDD40+
VBDD16MS2KF162 Phase PKP 244 MD 15B -L (NEMA17)0.421.515000.456050
VBDD16MS2+
VBDD25MS2KF252 Phase PKP 244 MD 15B -L (NEMA17)0.422.310000.5815050
VBDD25MS2+
VBDD16S2KF162 Phase PKP 268 MD 28B L (NEMA23)2.21.515001.656050
VBDD16S2+
VBDD25S2KF252 Phase PKP 268 MD 28B L (NEMA23)2.22.310001.7815050
VBDD25S2+
VBDD40S2KF402 Phase PKP 268 MD 28B L (NEMA23)2.26.48002.21225060
VBDD40S2+
VBDD100S2ISOK1002 Phase PKP 299 D 45B-L (NEMA 34)6.46.44001445900200
VBDD100S2+