Designed with a Separate Rotor and Dedicated Brush Block
SLIP RINGS
1.50 in Bore Slip Rings
Designed for larger rotary assemblies, 1.50 in Bore Slip Rings support continuous power and signal transmission while accommodating expanded through-bore requirements.
Key Specifications
Current: 5 A standard, 10 A optional
Voltage: 60 V standard, up to 1000 V optional (spacing modification available)
Rings: Solid coin silver
Brushes: Silver graphite, Fabricast FAG180 (80% Ag / 20% C)
- 2 brushes per ring (5 A)
- 4 brushes per ring (10 A)
Noise: 10 mΩ max (2 brushes), 5 mΩ max (4 brushes)
Hi-Pot: 1000 VAC, 15 sec
Rotor: Molded ring complement with diallyl phthalate dielectric
Leads: 20 AWG (5 A), 16 AWG (10 A), MIL-W-16878 Type “E”
Data: 1 Gb Ethernet capable for high-speed data transfer
Options: 10 A capacity, hard-vacuum compatible; optional brush grades available
Design & Construction
The 1.50 inch bore slip rings are designed for rotary systems that demand generous internal clearance while maintaining dependable electrical transfer. Conductive paths are formed using coin silver rings combined with silver graphite brush elements chosen for predictable contact behavior and long service life.
The brush assemblies are housed within a molded dielectric structure that supports electrical separation and mechanical stability as rotational inertia increases. A rigid aluminum rotor sleeve anchors the ring set, with the conductive components integrated directly into the assembly to support smooth rotation and uniform brush engagement across the full diameter.
Typical Applications
1.50 in Bore Slip Rings are commonly specified in larger rotary platforms where mechanical routing, airflow, or shaft diameter drive the need for expanded bore capacity, such as:
- Large-frame automation systems
- Rotary indexing tables and turntables
- Sensor towers and rotating enclosures
- Defense and aerospace mechanisms with complex internal routing
- Industrial equipment requiring high-reliability continuous rotation
Standard Brush Block
| Model | Rings | Length A (in) | Length B (in) |
| 1972 | 2 | 0.75 | 0.58 |
| 1973 | 3 | 0.75 | 0.58 |
| 1914 | 4 | 0.75 | 0.58 |
| 1915 | 5 | 0.87 | 0.7 |
| 1916 | 6 | 0.99 | 0.82 |
| 1917 | 7 | 1.11 | 0.94 |
| 1918 | 8 | 1.23 | 1.06 |
| 1919 | 9 | 1.35 | 1.18 |
| 19110 | 10 | 1.47 | 1.3 |
| 19112 | 12 | 1.71 | 1.54 |
| 19114 | 14 | 1.95 | 1.78 |
| 19116 | 16 | 2.19 | 2.02 |
| 19120 | 20 | 2.67 | 2.81 |
| 19124 | 24 | 3.15 | 3.29 |
Reduced Clearance Brush Block
| Model | Rings | Length A (in) | Length B (in) |
| 1972RC | 2 | 0.75 | 0.58 |
| 1973RC | 3 | 0.75 | 0.58 |
| 1914RC | 4 | 0.75 | 0.58 |
| 1915RC | 5 | 0.87 | 0.7 |
| 1916RC | 6 | 0.99 | 0.82 |
| 1917RC | 7 | 1.11 | 0.94 |
| 1918RC | 8 | 1.23 | 1.06 |
| 1919RC | 9 | 1.35 | 1.18 |
| 19110RC | 10 | 1.47 | 1.3 |
| 19112RC | 12 | 1.71 | 1.54 |
| 19114RC | 14 | 1.95 | 1.78 |
| 19116RC | 16 | 2.19 | 2.02 |
| 19120RC | 20 | 2.67 | 2.81 |
| 19124RC | 24 | 3.15 | 3.29 |
Download the complete specifications, dimensions, and electrical details for 1.50″ Bore Slip Rings designed with a Separate Rotor and Dedicated Brush Block.
While this page highlights standard configurations, Fabricast routinely adapts brush blocks, ring spacing, materials, and lead options for application-specific requirements. If your project requires a variation in voltage, current, environment, or mechanical interface, custom designs are available.