Boston Gear ER-B - 66121

  • About
  • Contact
  • Careers
  • Investors
Regal Rexnord Logo
We create a better tomorrow by energy-efficiently converting power into motion
Register Login
Register for a Better Experience:
Check Price and Inventory
Buy Online
Track Order Status and Order History
CREATE AN ACCOUNT LOG IN
×
×
×
  • Products
    • All Products
    • AC/DC Drives & Controls
    • Bearings
    • Clutches & Brakes
    • Conveyor Technologies
    • Couplings
    • Electric Motors
    • Electronic Components
    • Fan and Blower Solutions
    • Gearboxes
    • Industrial Chain
    • Linear Motion
    • Miniature Motion
    • Power Transmission Components
    • Precision Motion & Automation
    • Predictive Maintenance
    • Switchgear, Transfer Switches & Controls
    • All AC/DC Drives & Controls
    • AC Drives
    • DC Drives
    • Kits
    • All Bearings
    • Mounted Bearings
    • Unmounted Bearings
    • Specialty & Plain Bearings
    • Bearing Parts & Kits
    • All Conveyor Technologies
    • Plastic Modular Chain & Belt
    • TableTop Chains
    • Conveyor Sprockets & Wheels
    • Conveyor Components
    • Metal Wire Mesh Belts
    • Conveying Systems
    • Bulk Handling Components
    • Gear Drives & Geared Motors
    • All Couplings
    • Barrel Couplings
    • Chain Couplings
    • Disc Couplings
    • Driveshaft Couplings
    • Elastomeric Couplings
    • Flange Couplings
    • Fluid Couplings
    • Gear Couplings
    • Gear Spindles
    • Grease
    • Grid Couplings
    • Locking Assemblies & Shrink Discs
    • Rigid Couplings
    • Shaft Guards
    • Torque Limiters/Torque Overload Devices
    • Torsionally Soft Couplings
    • All Electric Motors
    • AC Motors - NEMA
    • AC Motors - IEC
    • DC Motors
    • Gearmotors
    • HVAC/R Motors
    • Motor Accessories
    • All Fan and Blower Solutions
    • Centrifugal Blowers
    • Draft Inducer Blowers
    • Centrifugal Fans
    • Axial Fans
    • Crossflow Blowers
    • All Gearboxes
    • Inline Gearboxes
    • Parallel Shaft Gearboxes
    • Precision Gearboxes
    • Right Angle Gearboxes
    • Shaft Mount Gearboxes
    • Gearbox Parts & Kits
    • Custom Gearbox Solutions
    • All Industrial Chains
    • Chain Components
    • Conveyor Components
    • Drop Forged Chain
    • Engineered Steel Chain
    • Idlers
    • Leaf Chain
    • Roller Chain
    • Silent Chain
    • Sprockets & Wheels
    • All Power Transmission Components
    • Belt Drives
    • Bushings
    • Mechanical Clutches
    • Tighteners & Idlers
    • Open Gearing
    • Farm Solutions
    • All Predictive Maintenance
    • Condition Monitoring Systems
    • All Switchgears, Transfer Switches and Controls
    • Load Bank
    • Switchgear
    • Transfer Switches
    • All Mounted Bearings
    • Mounted Ball Bearings
    • Mounted Spherical Roller Bearings
    • Mounted Tapered Roller Bearings
    • Mounted Sleeve Bearings
    • All Unmounted Bearings
    • Angular Contact Ball Bearings
    • Cam Followers
    • Cylindrical Roller Bearings
    • Deep Groove Ball Bearings
    • ER Ball Bearings
    • Journal Roller Bearings
    • Needle Roller Bearings
    • Replacement Inserts
    • Self-Aligning Ball Bearings
    • Spherical Roller Bearings
    • Tapered Roller Bearings
    • Thrust Ball Bearings
    • Thrust Roller Bearings
    • All Specialty & Plain Bearings
    • Rod Ends
    • Spherical Plain Bearings
    • Aerospace
    • Composite
    • All Bearing Parts & Kits
    • Housings
    • Seals
    • Threaded Covers
    • End Caps
    • Adapters
    • Lock Collars
    • Back Side Shields
    • Take-Up Frames
    • Installation Tools
    • Bearing Parts
    • All Plastic Modular Chain and Belt
    • Straight Running
    • Side Flexing
    • Spiral Cage Belts
    • All TableTop Chains
    • Straight Running
    • Side Flexing
    • Engineered Steel Chain
    • Leaf Chain
    • Roller Chain
    • TableTop® and MatTop® Sprockets
    • Industrial Chain Sprockets
    • All Conveyor Components
    • Product Guide & Brackets
    • Curves, Straight Tracks, & Return Systems
    • Frame Support & Levelers
    • Other Conveyor Solutions
    • Mounted Ball Bearings
    • All Metal Wire Mesh Belts
    • Straight Line Positive Drive
    • Metal Wire Mesh Accessories
    • Idlers
    • Industrial Chain Conveyor Components
    • All Elastomeric Couplings
    • Jaw and Wrap
    • Tire
    • All AC Motors - NEMA
    • Definite Purpose Motors
    • Electronically Commutated Motors
    • Explosion Proof Motors
    • Farm/Agriculture Motors
    • General Purpose Motors
    • HVAC/R Motors
    • Permanent Magnet Motors
    • Pump Motors
    • Severe Duty Motors
    • Special Voltage Motors
    • Variable Speed Motors
    • Washdown Motors
    • All AC Motors - IEC
    • Definite Purpose Motors
    • General Purpose Motors
    • Washdown Motors
    • All DC Motors
    • Explosion Proof Motors
    • General Purpose Motors
    • Low Voltage Motors
    • Metric Motors
    • SCR Motors
    • Sub-Fractional Motors
    • Washdown Motors
    • All Gearmotors
    • AC Gearmotors
    • DC Gearmotors
    • All Right Angle Gearboxes
    • Helical Hypoid
    • Helical Bevel
    • Bevel
    • Worm
    • All Chain Components
    • Chain Accessories
    • Chain Links and Pins
    • All Conveyor Components
    • Bucket Elevator Components
    • Conveyor Accessories
    • All Engineered Steel Chains
    • Conveyor Chain
    • Drive Chain
    • Elevator Chain
    • Welded Steel Chain
    • All Sprockets and Wheels
    • Sprockets
    • Wheels
    • All Belt Drives
    • Adjustable Motor Bases
    • Belt Drive Accessories
    • Belts
    • Synchronous Drives
    • V-Belt Sheaves
    • All Bushings
    • Q-D Bushings
    • Shaft Mount Taper Bore Bushings
    • Split Taper Bushings
    • Taper Bore Bushings
    • All Mechanical Clutches
    • Mechanical Cam Clutches
    • Torque Overload Devices
    • All Tightners & Idlers
    • Drive Tighteners
    • Flat Face Idlers
    • Gear Idlers
    • Gearbelt Pulley Idlers
    • Idler Bushings
    • Sprocket Idlers
    • Tightener Shafts
    • V-Belt Idlers
    • All Farm Solutions
    • Non PTO Products
    • PTO Products
  • Brands
    • Browning
    • Cambridge
    • CENTA
    • Century
    • Falk
    • FASCO
    • Genteq
    • Kollmorgen
    • LEESON
    • McGill
    • Nicotra Gebhardt
    • Portescap
    • Rex
    • Rexnord
    • Rexnord Aerospace
    • Sealmaster
    • Stromag
    • Svendborg Brakes
    • Thomson Linear
    • Thomson Power Systems
    • Warner Electric
    • View All Brands >
  • Solutions
    • Automation Solutions
    • Industrial Powertrain
    • Intelligent Solutions
    • Services
    • All Services
    • Reliability Services and Condition Monitoring
    • Coupling Recertification
    • Custom Conveyor Design
    • Gap Walk
    • Installation, Repair & Rebuild Services
  • Industries
    • All Industries
    • Aerospace
    • Aggregate & Quarry
    • Agriculture
    • Air Moving
    • Automotive
    • Beverage
    • Cement
    • Commercial Laundry
    • Compressors & Turbomachinery
    • Cooling Towers
    • Crane, Hoist & Winch
    • Data Centers
    • Food
    • Grain Handling
    • HVAC - Commercial
    • HVAC - Residential
    • Marine
    • Material Handling - Warehouse Distribution
    • Medical Refrigeration
    • Mining & Minerals
    • Oil & Gas
    • Packaging Machinery
    • Power Generation - Fossil
    • Power Generation - Solar & Wind
    • Primary Metals
    • Pulp, Paper & Forestry
    • Pumping - Commercial and Industrial
    • Pumping - Leisure
    • Refrigeration
    • Test Rigs & Industrial Machinery
    • Water & Wastewater
  • Resources
    • All Resources
    • Tools
    • Literature
    • Purchase
    • Product Information
    • Education & Insight
    • Support
    • All Tools
    • Product Cross Reference
    • Product Selectors
    • Calculators
    • Product Configurators
    • The Dealer Toolbox
    • IPS Edge Tools
    • V-Belt Drive Kits
    • All Purchase Resource
    • Request a Quote
    • Where To Buy
    • eCommerce
    • All Product Information
    • A2L Solutions
    • Motor Glossary
    • Quick Reference Motor Dimensions
    • Software Downloads
    • IP69K Washdown Solutions
    • Bearings IIoT
    • Product Information Portal
    • Materials Compliance
    • All Education and Insight
    • Events
    • News
    • Regal Rexnord Insights
    • Training
    • All Support
    • Service Center Locations
    • Website Help
    • All IPS Edge Tools
    • Product Selection
    • Bearing Registration
    • Belt Drive Efficiency Calculator
    • SPEC
  • Search
Menu
  • Products
  • Brands
  • Solutions
  • Industries
  • Resources
  • About
  • News
  • Events
  • Contact
  • Suppliers
  • Careers
  • Investors
Products
  • All
  • AC/DC Drives & Controls
  • Bearings
  • Clutches & Brakes
  • Conveyor Technologies
  • Couplings
  • Electric Motors
  • Electronic Components
  • Fan and Blower Solutions
  • Gearboxes
  • Industrial Chain
  • Linear Motion
  • Miniature Motion
  • Power Transmission Components
  • Precision Motion & Automation
  • Predictive Maintenance
  • Switchgear, Transfer Switches & Controls
Brands
  • All
  • Browning
  • Cambridge
  • CENTA
  • Century
  • Falk
  • FASCO
  • Genteq
  • Kollmorgen
  • LEESON
  • McGill
  • Nicotra Gebhardt
  • Portescap
  • Rex
  • Rexnord
  • Rexnord Aerospace
  • Sealmaster
  • Stromag
  • Svendborg Brakes
  • Thomson Linear
  • Thomson Power Systems
  • Warner Electric
  • <b>View All Brands ></b>
Solutions
  • All
  • Automation Solutions
  • Industrial Powertrain
  • Intelligent Solutions
  • Services
Industries
  • All
  • Aerospace
  • Aggregate & Quarry
  • Agriculture
  • Air Moving
  • Automotive
  • Beverage
  • Cement
  • Commercial Laundry
  • Compressors & Turbomachinery
  • Cooling Towers
  • Crane, Hoist & Winch
  • Data Centers
  • Food
  • Grain Handling
  • HVAC - Commercial
  • HVAC - Residential
  • Marine
  • Material Handling - Warehouse Distribution
  • Medical Refrigeration
  • Mining & Minerals
  • Oil & Gas
  • Packaging Machinery
  • Power Generation - Fossil
  • Power Generation - Solar & Wind
  • Primary Metals
  • Pulp, Paper & Forestry
  • Pumping - Commercial and Industrial
  • Pumping - Leisure
  • Refrigeration
  • Test Rigs & Industrial Machinery
  • Water & Wastewater
Resources
  • All
  • Tools
  • Literature
  • Purchase
  • IPS Edge Tools
  • Product Information
  • Education & Insight
  • Support
Suppliers
AC/DC Drives & Controls
  • All
  • AC Drives
  • DC Drives
  • Kits
Bearings
  • All
  • Mounted Bearings
  • Unmounted Bearings
  • Specialty & Plain Bearings
  • Bearing Parts & Kits
Clutches & Brakes
  • All
Conveyor Technologies
  • All
  • Plastic Modular Chain & Belt
  • TableTop Chains
  • Conveyor Sprockets & Wheels
  • Conveyor Components
  • Metal Wire Mesh Belts
  • Conveying Systems
  • Bulk Handling Components
  • Gear Drives & Geared Motors
Couplings
  • All
  • Barrel Couplings
  • Chain Couplings
  • Disc Couplings
  • Driveshaft Couplings
  • Elastomeric Couplings
  • Flange Couplings
  • Fluid Couplings
  • Gear Couplings
  • Gear Spindles
  • Grease
  • Grid Couplings
  • Locking Assemblies & Shrink Discs
  • Rigid Couplings
  • Shaft Guards
  • Torque Limiters/Torque Overload Devices
  • Torsionally Soft Couplings
Electric Motors
  • All
  • AC Motors - NEMA
  • AC Motors - IEC
  • DC Motors
  • Gearmotors
  • HVAC/R Motors
  • Motor Accessories
Electronic Components
  • All
Fan and Blower Solutions
  • All
  • Centrifugal Blowers
  • Draft Inducer Blowers
  • Centrifugal Fans
  • Axial Fans
  • Crossflow Blowers
Gearboxes
  • All
  • Inline Gearboxes
  • Parallel Shaft Gearboxes
  • Precision Gearboxes
  • Right Angle Gearboxes
  • Shaft Mount Gearboxes
  • Gearbox Parts & Kits
  • Custom Gearbox Solutions
Industrial Chain
  • All
  • Chain Components
  • Conveyor Components
  • Drop Forged Chain
  • Engineered Steel Chain
  • Idlers
  • Leaf Chain
  • Roller Chain
  • Silent Chain
  • Sprockets & Wheels
Linear Motion
  • All
Miniature Motion
  • All
Power Transmission Components
  • All
  • Belt Drives
  • Bushings
  • Mechanical Clutches
  • Tighteners & Idlers
  • Open Gearing
  • Farm Solutions
Precision Motion & Automation
  • All
Predictive Maintenance
  • All
  • Condition Monitoring Systems
Switchgear, Transfer Switches & Controls
  • All
  • Load Bank
  • Switchgear
  • Transfer Switches
Browning
  • All
Cambridge
  • All
CENTA
  • All
Century
  • All
Falk
  • All
FASCO
  • All
Genteq
  • All
Kollmorgen
  • All
LEESON
  • All
McGill
  • All
Nicotra Gebhardt
  • All
Portescap
  • All
Rex
  • All
Rexnord
  • All
Rexnord Aerospace
  • All
Sealmaster
  • All
Stromag
  • All
Svendborg Brakes
  • All
Thomson Linear
  • All
Thomson Power Systems
  • All
Warner Electric
  • All
<b>View All Brands ></b>
  • All
Automation Solutions
  • All
Industrial Powertrain
  • All
Intelligent Solutions
  • All
Services
  • All
  • Reliability Services and Condition Monitoring
  • Coupling Recertification
  • Custom Conveyor Design
  • Gap Walk
  • Installation, Repair & Rebuild Services
Aerospace
  • All
Aggregate & Quarry
  • All
Agriculture
  • All
Air Moving
  • All
Automotive
  • All
Beverage
  • All
Cement
  • All
Commercial Laundry
  • All
Compressors & Turbomachinery
  • All
Cooling Towers
  • All
Crane, Hoist & Winch
  • All
Data Centers
  • All
Food
  • All
Grain Handling
  • All
HVAC - Commercial
  • All
HVAC - Residential
  • All
Marine
  • All
Material Handling - Warehouse Distribution
  • All
Medical Refrigeration
  • All
Mining & Minerals
  • All
Oil & Gas
  • All
Packaging Machinery
  • All
Power Generation - Fossil
  • All
Power Generation - Solar & Wind
  • All
Primary Metals
  • All
Pulp, Paper & Forestry
  • All
Pumping - Commercial and Industrial
  • All
Pumping - Leisure
  • All
Refrigeration
  • All
Test Rigs & Industrial Machinery
  • All
Water & Wastewater
  • All
Tools
  • All
  • Product Cross Reference
  • Product Selectors
  • Calculators
  • Product Configurators
  • The Dealer Toolbox
  • V-Belt Drive Kits
Literature
  • All
Purchase
  • All
  • Request a Quote
  • Where To Buy
  • eCommerce
IPS Edge Tools
  • All
Product Information
  • All
  • A2L Solutions
  • Motor Glossary
  • Quick Reference Motor Dimensions
  • Software Downloads
  • IP69K Washdown Solutions
  • Bearings IIoT
  • Product Information Portal
  • Materials Compliance
Education & Insight
  • All
  • Events
  • News
  • Regal Rexnord Insights
  • Training
Support
  • All
  • Service Center Locations
  • Website Help
AC Drives
  • All
DC Drives
  • All
Kits
  • All
Mounted Bearings
  • All
  • Mounted Ball Bearings
  • Mounted Spherical Roller Bearings
  • Mounted Tapered Roller Bearings
  • Mounted Sleeve Bearings
Unmounted Bearings
  • All
  • Angular Contact Ball Bearings
  • Cam Followers
  • Cylindrical Roller Bearings
  • Deep Groove Ball Bearings
  • ER Ball Bearings
  • Journal Roller Bearings
  • Needle Roller Bearings
  • Replacement Inserts
  • Self-Aligning Ball Bearings
  • Spherical Roller Bearings
  • Tapered Roller Bearings
  • Thrust Ball Bearings
  • Thrust Roller Bearings
Specialty & Plain Bearings
  • All
  • Rod Ends
  • Spherical Plain Bearings
  • Aerospace
  • Composite
Bearing Parts & Kits
  • All
  • Housings
  • Seals
  • Threaded Covers
  • End Caps
  • Adapters
  • Lock Collars
  • Back Side Shields
  • Take-Up Frames
  • Installation Tools
  • Bearing Parts
Plastic Modular Chain & Belt
  • All
  • Straight Running
  • Side Flexing
  • Spiral Cage Belts
TableTop Chains
  • All
  • Straight Running
  • Side Flexing
  • Engineered Steel Chain
  • Leaf Chain
  • Roller Chain
Conveyor Sprockets & Wheels
  • All
  • TableTop® and MatTop® Sprockets
  • Industrial Chain Sprockets
Conveyor Components
  • All
  • Product Guide & Brackets
  • Curves, Straight Tracks, & Return Systems
  • Frame Support & Levelers
  • Other Conveyor Solutions
  • Mounted Ball Bearings
Metal Wire Mesh Belts
  • All
  • Straight Line Positive Drive
  • Metal Wire Mesh Accessories
Conveying Systems
  • All
Bulk Handling Components
  • All
  • Idlers
  • Industrial Chain Conveyor Components
Gear Drives & Geared Motors
  • All
Barrel Couplings
  • All
Chain Couplings
  • All
Disc Couplings
  • All
Driveshaft Couplings
  • All
Elastomeric Couplings
  • All
  • Jaw and Wrap
  • Tire
Flange Couplings
  • All
Fluid Couplings
  • All
Gear Couplings
  • All
Gear Spindles
  • All
Grease
  • All
Grid Couplings
  • All
Locking Assemblies & Shrink Discs
  • All
Rigid Couplings
  • All
Shaft Guards
  • All
Torque Limiters/Torque Overload Devices
  • All
Torsionally Soft Couplings
  • All
AC Motors - NEMA
  • All
  • Definite Purpose Motors
  • Electronically Commutated Motors
  • Explosion Proof Motors
  • Farm/Agriculture Motors
  • General Purpose Motors
  • HVAC/R Motors
  • Permanent Magnet Motors
  • Pump Motors
  • Severe Duty Motors
  • Special Voltage Motors
  • Variable Speed Motors
  • Washdown Motors
AC Motors - IEC
  • All
  • Definite Purpose Motors
  • General Purpose Motors
  • Washdown Motors
DC Motors
  • All
  • Explosion Proof Motors
  • General Purpose Motors
  • Low Voltage Motors
  • Metric Motors
  • SCR Motors
  • Sub-Fractional Motors
  • Washdown Motors
Gearmotors
  • All
  • AC Gearmotors
  • DC Gearmotors
HVAC/R Motors
  • All
Motor Accessories
  • All
Centrifugal Blowers
  • All
Draft Inducer Blowers
  • All
Centrifugal Fans
  • All
Axial Fans
  • All
Crossflow Blowers
  • All
Inline Gearboxes
  • All
Parallel Shaft Gearboxes
  • All
Precision Gearboxes
  • All
Right Angle Gearboxes
  • All
  • Helical Hypoid
  • Helical Bevel
  • Bevel
  • Worm
Shaft Mount Gearboxes
  • All
Gearbox Parts & Kits
  • All
Custom Gearbox Solutions
  • All
Chain Components
  • All
  • Chain Accessories
  • Chain Links and Pins
Conveyor Components
  • All
  • Bucket Elevator Components
  • Conveyor Accessories
Drop Forged Chain
  • All
Engineered Steel Chain
  • All
  • Conveyor Chain
  • Drive Chain
  • Elevator Chain
  • Welded Steel Chain
Idlers
  • All
Leaf Chain
  • All
Roller Chain
  • All
Silent Chain
  • All
Sprockets & Wheels
  • All
  • <span class="border-bottom pb-1 nav-all-link">All Sprockets and Wheels</span>
  • Sprockets
  • Wheels
Belt Drives
  • All
  • Adjustable Motor Bases
  • Belt Drive Accessories
  • Belts
  • Synchronous Drives
  • V-Belt Sheaves
Bushings
  • All
  • Q-D Bushings
  • Shaft Mount Taper Bore Bushings
  • Split Taper Bushings
  • Taper Bore Bushings
Mechanical Clutches
  • All
  • Mechanical Cam Clutches
  • Torque Overload Devices
Tighteners & Idlers
  • All
  • Drive Tighteners
  • Flat Face Idlers
  • Gear Idlers
  • Gearbelt Pulley Idlers
  • Idler Bushings
  • Sprocket Idlers
  • Tightener Shafts
  • V-Belt Idlers
Open Gearing
  • All
Farm Solutions
  • All
  • Non PTO Products
  • PTO Products
Condition Monitoring Systems
  • All
Load Bank
  • All
Switchgear
  • All
Transfer Switches
  • All
Reliability Services and Condition Monitoring
  • All
Coupling Recertification
  • All
Custom Conveyor Design
  • All
Gap Walk
  • All
Installation, Repair & Rebuild Services
  • All
Product Cross Reference
  • All
Product Selectors
  • All
Calculators
  • All
Product Configurators
  • All
The Dealer Toolbox
  • All
V-Belt Drive Kits
  • All
Request a Quote
  • All
Where To Buy
  • All
eCommerce
  • All
A2L Solutions
  • All
Motor Glossary
  • All
Quick Reference Motor Dimensions
  • All
Software Downloads
  • All
IP69K Washdown Solutions
  • All
Bearings IIoT
  • All
Product Information Portal
  • All
Materials Compliance
  • All
Events
  • All
News
  • All
Regal Rexnord Insights
  • All
Training
  • All
Service Center Locations
  • All
Website Help
  • All
<span class="border-bottom pb-1 nav-all-link">All Mounted Bearings</span>
  • All
Mounted Ball Bearings
  • All
Mounted Spherical Roller Bearings
  • All
Mounted Tapered Roller Bearings
  • All
Mounted Sleeve Bearings
  • All
<span class="border-bottom pb-1 nav-all-link">All Unmounted Bearings</span>
  • All
Angular Contact Ball Bearings
  • All
Cam Followers
  • All
Cylindrical Roller Bearings
  • All
Deep Groove Ball Bearings
  • All
ER Ball Bearings
  • All
Journal Roller Bearings
  • All
Needle Roller Bearings
  • All
Replacement Inserts
  • All
Self-Aligning Ball Bearings
  • All
Spherical Roller Bearings
  • All
Tapered Roller Bearings
  • All
Thrust Ball Bearings
  • All
Thrust Roller Bearings
  • All
<span class="border-bottom pb-1 nav-all-link">All Specialty & Plain Bearings</span>
  • All
Rod Ends
  • All
Spherical Plain Bearings
  • All
Aerospace
  • All
Composite
  • All
<span class="border-bottom pb-1 nav-all-link">All Bearing Parts & Kits</span>
  • All
Housings
  • All
Seals
  • All
Threaded Covers
  • All
End Caps
  • All
Adapters
  • All
Lock Collars
  • All
Back Side Shields
  • All
Take-Up Frames
  • All
Installation Tools
  • All
Bearing Parts
  • All
<span class="border-bottom pb-1 nav-all-link">All Plastic Modular Chain and Belt</span>
  • All
Straight Running
  • All
Side Flexing
  • All
Spiral Cage Belts
  • All
<span class="border-bottom pb-1 nav-all-link">All TableTop Chains</span>
  • All
Straight Running
  • All
Side Flexing
  • All
Engineered Steel Chain
  • All
Leaf Chain
  • All
Roller Chain
  • All
TableTop® and MatTop® Sprockets
  • All
Industrial Chain Sprockets
  • All
Traction Wheels
  • All
<span class="border-bottom pb-1 nav-all-link">All Conveyor Components</span>
  • All
Product Guide & Brackets
  • All
Curves, Straight Tracks, & Return Systems
  • All
Frame Support & Levelers
  • All
Other Conveyor Solutions
  • All
Mounted Ball Bearings
  • All
<span class="border-bottom pb-1 nav-all-link">All Metal Wire Mesh Belts</span>
  • All
Straight Line Positive Drive
  • All
Metal Wire Mesh Accessories
  • All
Idlers
  • All
Industrial Chain Conveyor Components
  • All
<span class="border-bottom pb-1 nav-all-link">All Elastomeric Couplings</span>
  • All
Jaw and Wrap
  • All
Tire
  • All
<span class="border-bottom pb-1 nav-all-link">All AC Motors - NEMA</span>
  • All
Definite Purpose Motors
  • All
Electronically Commutated Motors
  • All
Explosion Proof Motors
  • All
Farm/Agriculture Motors
  • All
General Purpose Motors
  • All
HVAC/R Motors
  • All
Permanent Magnet Motors
  • All
Pump Motors
  • All
Severe Duty Motors
  • All
Special Voltage Motors
  • All
Variable Speed Motors
  • All
Washdown Motors
  • All
<span class="border-bottom pb-1 nav-all-link">All AC Motors - IEC</span>
  • All
Definite Purpose Motors
  • All
General Purpose Motors
  • All
Washdown Motors
  • All
<span class="border-bottom pb-1 nav-all-link">All DC Motors</span>
  • All
Explosion Proof Motors
  • All
General Purpose Motors
  • All
Low Voltage Motors
  • All
Metric Motors
  • All
SCR Motors
  • All
Sub-Fractional Motors
  • All
Washdown Motors
  • All
<span class="border-bottom pb-1 nav-all-link">All Gearmotors</span>
  • All
AC Gearmotors
  • All
DC Gearmotors
  • All
<span class="border-bottom pb-1 nav-all-link">All Right Angle Gearboxes</span>
  • All
Helical Hypoid
  • All
Helical Bevel
  • All
Bevel
  • All
Worm
  • All
<span class="border-bottom pb-1 nav-all-link">All Chain Components</span>
  • All
Chain Accessories
  • All
Chain Links and Pins
  • All
<span class="border-bottom pb-1 nav-all-link">All Conveyor Components</span>
  • All
Bucket Elevator Components
  • All
Conveyor Accessories
  • All
<span class="border-bottom pb-1 nav-all-link">All Engineered Steel Chains</span>
  • All
Conveyor Chain
  • All
  • Mining Chain
  • Roller Conveyor
  • Rollerless Conveyor
  • Sugar Chain
Drive Chain
  • All
  • Offset Sidebar
  • Straight Sidebar
Elevator Chain
  • All
  • Asphalt Chain
  • High Load Elevator
  • Mill Duty Elevator
Welded Steel Chain
  • All
  • Hard Face Drag
  • Narrow Mill
  • Wide Mill Drag
<span class="border-bottom pb-1 nav-all-link">All Sprockets and Wheels</span>
  • All
Sprockets
  • All
Wheels
  • All
<span class="border-bottom pb-1 nav-all-link">All Belt Drives</span>
  • All
Adjustable Motor Bases
  • All
Belt Drive Accessories
  • All
Belts
  • All
Synchronous Drives
  • All
V-Belt Sheaves
  • All
<span class="border-bottom pb-1 nav-all-link">All Bushings</span>
  • All
Q-D Bushings
  • All
Shaft Mount Taper Bore Bushings
  • All
Split Taper Bushings
  • All
Taper Bore Bushings
  • All
<span class="border-bottom pb-1 nav-all-link">All Mechanical Clutches</span>
  • All
Mechanical Cam Clutches
  • All
Torque Overload Devices
  • All
<span class="border-bottom pb-1 nav-all-link">All Tightners & Idlers</span>
  • All
Drive Tighteners
  • All
Flat Face Idlers
  • All
Gear Idlers
  • All
Gearbelt Pulley Idlers
  • All
Idler Bushings
  • All
Sprocket Idlers
  • All
Tightener Shafts
  • All
V-Belt Idlers
  • All
<span class="border-bottom pb-1 nav-all-link">All Farm Solutions</span>
  • All
Non PTO Products
  • All
PTO Products
  • All
  1. Home
  2. Products
  3. Others
  4. 66121
  •  
  •  
  •  
    • Add to Favorites
      Sign-in or create a free RegalRexnord.com Account to save this page to your favorites list for easy access.
      Login >
      Added To Favorites
      This page has been added to your favorites list.
      View My Favorites >
      Removed from Favorites
      This page has been removed from your favorites list. To re-add, click the star icon again.
      View My Favorites >
      Favorites List Full
      Your favorites list is full. Please remove other favorite(s) to add this page.
      View My Favorites >
      Add to Favorites
      Save this page to your favorites list for easy access.
      View My Favorites >
Email a friend
Help us improve
  

Feedback Submitted Successfully

Select up to three products to compare.
Catalog #:
Part #:
Customer Part #:
Compare (1) Compare (3)

Boston Gear ER-B - 66121

Part #:30241499
Catalog #:66121
Product Specs Related Products
This product complies with the standards of the country you selected.
Sorry, at this time this product does not comply with the standards of the country you selected.
Weight:25.00 LB
UOM:EA
List Price: $1,068.70
Where to Buy
Check Inventory
 
Warehouse
Qty
Est. Ship Date
Register or Login

to access inventory and shipment dates based on permission.



How can we improve our Product Information?
Resource Center
WATCH ON Youtube
Download All Documents

Talk to one of our expert sales professionals about how this brand can efficiently power your business.


Product Specifications

  • General Specifications

General Specifications

UPC: 781711661215 Weight: 25.00 LB
HTC: 8501.51.4040 Country of Origin: United States of America
Regal Rexnord logo

About

  • Careers
  • News
  • Events
  • Products
  • Industries
  • Brands
  • Investors
  • Suppliers
  • Sustainability

Contact

  • Global Locations
  • Our Brands
  • Where to Buy
© 2026 Regal Rexnord Corporation, All Rights Reserved.
  • Privacy
  • Terms of Use
  • Privacy
  • Sitemap
  • CA Trans Sup Act Notice
  • Terms and Conditions of Sale
  • Rexnord Trademark Logo
  • Regal Trademark Logo
In October 2021, these industry leaders were combined to create Regal Rexnord.
Reset Password

Please enter your email address and new password below to reset your password.

  • Rule #1
  • Rule #2
  • Rule #3
Loading…