Miniature Bore


Model 303 Oilfield-Downhole Slip Ring

The Model 303 miniature bore is a family of electrical slip ring products designed specifically for the extremely harsh high temperature and high pressure (HTHP) oilfield-downhole environment. These products are designed and tested to operate at temperatures of up to 200°C and pressures of 25,000 psi (1700 Bar), and are generally configured for an oil-filled environment. Contact our oilfield - downhole slip ring experts for details.


  • Withstands temperatures of up to 200°C and pressures of 25,000 psi (1700 Bar). Higher temperatures and pressures possible
  • Can be combined with high temperature and high pressure resolvers and motors for position and speed feedback and motive power
  • Inner bore and outer diameter can be customized for specific downhole tooling envelopes
  • Low electrical contact resistance
  • Pressure and temperature compensation available
  • Up to 1000 V versions


  • Slip rings eliminate cable twist and jamming
  • Easily integrated with other products such as motors and resolvers to reduce integration issues
  • Proven, fielded technology
  • Increase in power and bandwidth capacity, and improved power transmission efficiency as compared to inductive technologies
  • High quality and reliability


  • High temperature and pressure test simulator capable of 260°C and 30,000 psi
  • Includes in situ rotation
  • Fully tested at peak temperature and pressure conditions to minimize any failure modes
  • Shock and vibration testing carried out to specific customer requirements
Rotational Speeds Up to 600 rpm standard
Contact factory for other requirements
Temperature 200°C standard
Consult factory for other requirements
Pressure 25 kpsi (1700 bar)
Channels Up to 8
Voltage 250 - 500 VAC standard
Current Up to 2 A per channel
Key Dimensions 0.375” (9.5 mm) hollow bore ID,
~1.7” (43.2 mm) minimum OD

Contact Us

Technical Support

Telephone:  +1-902-468-2263

Typical Applications

  • Wirelining
  • Measuring / logging while drilling
  • Industrial high temperature applications