The DSTI EST Series Through-Bore Electrical Slip Rings, engineered and manufactured by Dynamic Sealing Technologies, Inc. (DSTI - USA), represent heavy-duty dynamic electrical contact technology designed specifically for industrial automation machinery requiring simultaneous transfer of high-voltage power lines and sensitive control signals around a rotating structural shaft.

The EST Series serves as an advanced, direct drop-in replacement for the industry-standard AC4598 series (models AC4598-6, AC4598-12, AC4598-18, and AC4598-24). The series features a generous 1.5-inch [38.1 mm] center through-bore opening, allowing machine designers to mount the slip ring directly over drive shafts, hydraulic or pneumatic plumbing conduits, or route optical fiber and secondary wiring through the center without compromising valuable machine footprint.

Key Engineering Features & Operational Advantages:
- 1.5-Inch [38.1 mm] Through-Bore Architecture: Provides versatile mounting flexibility directly onto machine rotating shafts via clamping collars or flanged sleeves. Furthermore, it easily accommodates coaxial integration with DSTI fluid rotary unions (such as SPS, GP, LT, or SE Series), yielding an all-in-one integrated fluid-power-signal rotary joint assembly.
- Advanced Silver Fiber Brush Contact Technology: The defining mechanical advantage of the EST Series lies in its multi-filament precious silver fiber brush bundles. These fiber brushes interface with the slip ring rotor tracks under very low contact force, require absolutely no lubrication, and produce virtually zero wear debris throughout their operational lifespan. This eliminates contact contamination, prevents electrical arcing, and extends service maintenance intervals to tens of millions of continuous rotations.
- Heavy-Duty 10A / 600V Rating on Every Circuit: Standardized with a robust 10 Amps continuous current capacity per circuit and a 600V AC/DC dielectric rating across all channels. This allows engineers complete freedom to power AC/DC servo drives, electric heaters, and pneumatic solenoid valves, while simultaneously transferring sensitive low-voltage analog and digital control signals with exceptional electrical isolation.
- Ultra-Low Electrical Resistance Noise (≤ 100 Milliohms): Guarantees crisp, undistorted data transfer for analog sensor feedback (0-10V, 4-20mA, thermocouples, RTDs), high-resolution encoder pulses, and industrial digital communication buses operating at speeds up to 50 Mbps.
- Heavy-Duty 16 AWG Tin-Plated Copper Leads: Equipped with generous 36-inch [914 mm] flying leads constructed of stranded tin-plated copper with color-coded insulation conforming to international electrical standards, ensuring safe, rapid, and error-free wiring.
- Low-Torque Engineering with Dual Precision Bearings: Optimized brush engagement paired with dual heavy-duty sealed precision ball bearings ensures minimal starting and running drag torque, delivering silky-smooth operation up to 250 RPM without vibration or excessive heat dissipation.

Typical Industrial Applications:
- Multi-station automated rotary indexing tables, CNC machine carousels, and rotary workholding fixtures.
- Heavy-duty articulated robotic arms, robotic welding positioners, and automated palletizers.
- Industrial roll packaging, rotary pallet stretch wrappers, labeling machines, and converting equipment.
- Motorized electric cable reeling drums and overhead crane hoist winches.
- Radar and surveillance tracking pedestals, medical rotary scanners, and rotary test dynamometers.

• Manufacturer: DSTI (Dynamic Sealing Technologies, Inc.)
• Origin / Country of Manufacture: USA
• Product Line: EST Series Through-Bore Electrical Slip Rings (Heavy-Duty)
• Model Configurations & Dimensional Breakdowns:
  - EST6 (Equivalent drop-in replacement for AC4598-6):
    + Total Circuits: 6 Independent Circuits
    + Electrical Rating: (6x) 10A | 600V AC/DC
    + Overall Length: 2.130" [54.0 mm] | Outer Diameter: 3.900" [99.0 mm]
  - EST12 (Equivalent drop-in replacement for AC4598-12):
    + Total Circuits: 12 Independent Circuits
    + Electrical Rating: (12x) 10A | 600V AC/DC
    + Overall Length: 3.070" [78.0 mm] | Outer Diameter: 3.900" [99.0 mm]
  - EST18 (Equivalent drop-in replacement for AC4598-18):
    + Total Circuits: 18 Independent Circuits
    + Electrical Rating: (18x) 10A | 600V AC/DC
    + Overall Length: 4.010" [102.0 mm] | Outer Diameter: 3.900" [99.0 mm]
  - EST24 (Equivalent drop-in replacement for AC4598-24):
    + Total Circuits: 24 Independent Circuits
    + Electrical Rating: (24x) 10A | 600V AC/DC
    + Overall Length: 4.940" [125.0 mm] | Outer Diameter: 3.900" [99.0 mm]
• Center Through-Bore Size: 1.500" [38.1 mm]
• Current Rating per Circuit: 10 Amps continuous
• Voltage Rating: 600V AC/DC
• Maximum Operating Speed: 250 RPM
• Maximum Data Transmission Speed: Under 50 Mbps (Non-Ethernet, Analog and Digital signals)
• Maximum Electrical Noise: ≤ 100 Milliohms (mΩ) at rated speed
• Contact Metallurgy: Multi-contact Silver (Ag) Fiber Brush technology
• Contact Characteristics: Low contact force, lubricant-free, virtually zero wear debris
• Lead Wire Material: Stranded Tin-Plated Copper, color-coded insulation
• Lead Wire Gauge: 16 AWG
• Standard Lead Wire Length: 36 inches [914 mm] on both rotor and stator ends
• Internal Bearings: Dual pre-lubricated heavy-duty precision ball bearings
• Environmental Ingress Protection: Resistant to ambient dust, minor liquid splashes, and atmospheric condensation
• Operating Temperature Range: -40°C to +80°C [-40°F to +176°F]
• Mechanical Mounting: Through-bore shaft clamping; engineered for direct coaxial integration with DSTI fluid rotary unions.