Overview
The Grove Gear GRG-T-821-20-I IRONMAN worm gear reducer delivers smooth, efficient 20:1 speed reduction in a time-proven cast-iron package. This single-reduction unit provides precise output control and consistent torque transmission for demanding industrial motion control systems. The GRG-T-821-20-I is part of Grove Gear’s IRONMAN series, engineered for reliability across manufacturing, packaging, and material handling applications.
Key Features
- 20:1 nominal gear ratio for controlled speed reduction from 1750 rpm input
- One-piece cast-iron housing with single output cover design for structural rigidity
- Right-angle configuration enables compact mounting and flexible system layout
- Factory-filled with Mobil Glygoyle 460 PAG synthetic lubricant for extended seal life and thermal stability
- FKM double-lip seals protect against contamination and temperature extremes
- Quill seal guard prevents input seal damage during motor coupling
- Interchangeable with Leeson IRONMAN and Flexaline series reducers
Technical Specifications
- Nominal Ratio: 20:1
- Center Distance: 2.06 inches
- Maximum Input RPM: 1750 (at rated load)
- Output RPM (at 1750 input): 88 rpm (nominal)
- Housing Material: Cast Iron (IRONMAN series, Style T)
- Input Type: Quill/Solid shaft
- Output Shaft: Solid
- Lubrication: PAG Synthetic Oil (Mobil Glygoyle 460)
- Mounting: Flange mount (model dependent)
- Shaft Seals: FKM double-lip design
- Operating Temperature Range: -20 to +140°F (standard)
- Catalog Number: GRG8210017.00
Typical Applications
The GRG-T-821-20-I excels in industrial environments where compact right-angle drive and reliable torque delivery are essential:
- Conveyor and material handling systems
- Packaging machinery and automation equipment
- Mixer and agitator drives
- Hoist and lifting equipment
- Textile and printing press feeds
- Industrial blowers and compressors
- General production machinery requiring speed reduction
Compatibility & Replacements
Compatible With
- NEMA C-face and B5 flanged input motors (48–250 frame sizes)
- Standard three-phase and single-phase motors up to rated horsepower
- IEC metric motor mounting (frame equivalent available)
- Flexible coupling and direct motor coupling installations
- Systems designed for 1750 rpm input speed
Replaces / Drop-In Replacement For
- Leeson IRONMAN GRL-T-821-20-I (identical footprint and performance)
- Grove Gear Flexaline 821-20 series units (same center distance and mounting)
- Earlier Flexaline reducers in the 821 size class with equivalent ratio
Works With
- Standard industrial AC motors with NEMA C-face and B5 flange adapters
- Baldor, Leeson, WEG, and other OEM motor frames in compatible sizes
- Mechanical shaft couplings and flexible drive elements
- Lubrication systems using PAG synthetic oils (Mobil Glygoyle equivalent)
- Industrial automation control systems requiring constant-ratio drive reduction
