| Feature | Details |
| Product Name | Step-Up Gear / Bull Gear Assembly |
| Brand | Ingersoll Rand (Genuine IR) |
| Part Numbers | 39586060 / 39586508 |
| Compatible Models | Centac Centrifugal Compressors (Series 2C, 3C, CV2) |
| Material | High-strength Hardened Alloy Steel |
| Manufacturing Process | Precision Ground & Balanced (AGMA Class 12 or higher) |
| Function | Power transmission and speed multiplication |