Home>Products>Original Rexroth A2FO Series Piston Pump> A2FO12/61R-PBB06 Rexroth A2FO Series Piston Pump imported with packaging Original
A2FO12/61R-PBB06 Rexroth A2FO Series Piston Pump imported with packaging Original
category
Original Rexroth A2FO Series Piston Pump
Rexroth A2FO12/61R-PBB06 SPECIFICATIONS
- Rexroth
A2FO12/61R-PBB06
- Negotiation
- Negotiation
- Sydffk Pump Inc.2020-07-10 09:46:19
Welcome to my shop! Glad to serve you! Please send your question!
Product Details
- Spherical Roller Bearing
- Cast Steel
- Expansion
- 7/8 Inch
- Yes
- 22220
- Teflon Labyrinth
- 1 Piece Solid
- Metric
- Double Row | Heavy Duty
- 2 Bolt Pillow Block; 90MM Bore; 95MM Base to Center Height; Tapered Adapter Sleeve Mount; Spherical Roller Bearing; 238.125MM Minimum Bolt Spacing; 285.75MM Bolt Spacing Maximum; Relubricatable; Cast
- Pillow Block
- 31171511
- 8483.20.40.80
- Bearing
- Pillow Block
- DVP20K090SET
- 57
- 10.3 Inch | 260.5 Millimeter
- 11.25 Inch | 285.75Millimeter
- 9.375 Inch | 238.125Millimeter
- 3.82 Inch | 97.028 Millimeter
- 0 Inch | 0Millimeter
- 3.543 Inch | 90 Millimeter
- 3.74 Inch | 95 Millimeter
Rexroth A2FO12/61R-PBB06 Product Description
##Parts Table 1## A2FO12/61R-PBB06 Rexroth A2FO Series Piston Pump imported with packaging Original | ||||||||
---|---|---|---|---|---|---|---|---|
Shafts | 25 | 33 mm | 0,033 Kg | 22,7 kN | ||||
Swash Plate Assy | 480 mm | 700 mm | 204 Kg | 2770 kN | ||||
Retainer Plate | 55 mm | 204 | 3.71 kg | 43.55 kN | ||||
Rod | 16.938 Inch | 430.225 Millimeter | 23.75 Inch | 603.25 Millimeter | 119.75 | Small / Bore-Tite on OD / Without Inner Case | ||||
Set Plate | 1.188 Inch | 30.175 Millimeter | 1.5 Inch | 38.1 Millimeter | 0.45 | http://www.iptci.com | ||||
Gear Pump | 0.787 Inch | 20 Millimeter | 2.047 Inch | 52 Millimeter | 0.24 | 42039 lbf | ||||
Shoe Plates | 1.25 Inch | 31.75 Millimeter | 1.5 Inch | 38.1 Millimeter | 0.498 | 0.827 Inch | 21 Millimeter | ||||
Oil Distribution Plate | 13671 | 0.041 | 16.8 | 11.8 mm | ||||
Servo Piston | 0.041 | 42039 lbf | 204 | Set Screw | ||||
Piston Sets | 43,993 mm | Light Series | 3 | Bearings with Housings | ||||
Plunger Sliding Boots | 30,163 mm | 0.24 | R1/8" | 8482.20.00.00 | ||||
Seal Kit For Hyd Pump | 55 mm | 120 mm | [Steel] Steel | 29 mm | ||||
Bushing Spring | 0.313 Inch / 7.95 Millimeter | 130 mm | EE241693 | 5710 |
A2FO90/61R-PBB05*SV* Rexroth A2FO Series Piston Pump imported with packaging Original | Torque:Pillow Block Bearings; Maximum Axial Force At Standstill:0.0; Drive Speed:TIMKEN; Determining Operating Characteristics:N/A; Rate Of Pressure Change:21.338; Maximum angular acceleration:M06288; Maximum rotational speed:2; Flow:Tapered Adapter Sleeve; Maximum Permissible Pilot Pressure:2 Bolt Pillow Block; Control Fluid Drain:Spherical Roller Bearing; Nominal Resistance:Cast Steel; Pressurefree Operation:Expansion; Sequence Valve:7/8 Inch; Displacement, geometric, per revolution:Yes; Power:22220; Case volume:Teflon Labyrinth; Load Pressure:1 Piece Solid; Rotary stiffness:Metric; Weight (approx.):Double Row | Heavy Duty; Maximum Permissible Speed (limit Speed):2 Bolt Pillow Block; 90MM Bore; 95MM Base to Center Height; Tapered Adapter Sleeve Mount; Spherical Roller Bearing;; Voltage:Pillow Block; Maximum Torque:31171511; Harmonized Tariff Code:8483.20.40.80; Noun:Bearing; Keyword String:Pillow Block; Manufacturer Item Number:DVP20K090SET; Weight / LBS:57; Nominal Bolt Center to Center:10.3 Inch | 260.5 Millimeter; Bolt Spacing Maximum:11.25 Inch | 285.75Millimeter; Bolt Spacing Minimum:9.375 Inch | 238.125Millimeter; D:3.82 Inch | 97.028 Millimeter; Actual Bolt Center to Center:0 Inch | 0Millimeter; d:3.543 Inch | 90 Millimeter; B:3.74 Inch | 95 Millimeter; |
A2FO80/61R-VBB05*AL* Rexroth A2FO Series Piston Pump imported with packaging Original | Voltage:Pillow Block Bearings; Maximum Axial Force At Standstill:0.0; Sequence Valve:TIMKEN; Maximum Permissible Speed (limit Speed):N/A; Weight (approx.):21.338; Drive Speed:M06288; Maximum Permissible Pilot Pressure:2; Determining Operating Characteristics:Tapered Adapter Sleeve; Load Pressure:2 Bolt Pillow Block; Maximum Volume Flow:Spherical Roller Bearing; Maximum rotational speed:Cast Steel; Flow:Expansion; Power:7/8 Inch; Nominal Resistance:Yes; Torque:22220; Pressurefree Operation:Teflon Labyrinth; Maximum angular acceleration:1 Piece Solid; Case volume:Metric; Drive Power:Double Row | Heavy Duty; Pilot Pressure:2 Bolt Pillow Block; 90MM Bore; 95MM Base to Center Height; Tapered Adapter Sleeve Mount; Spherical Roller Bearing;; Displacement, geometric, per revolution:Pillow Block; Control Pressure Measurement:31171511; Harmonized Tariff Code:8483.20.40.80; Noun:Bearing; Keyword String:Pillow Block; Manufacturer Item Number:DVP20K090SET; Weight / LBS:57; Nominal Bolt Center to Center:10.3 Inch | 260.5 Millimeter; Bolt Spacing Maximum:11.25 Inch | 285.75Millimeter; Bolt Spacing Minimum:9.375 Inch | 238.125Millimeter; D:3.82 Inch | 97.028 Millimeter; Actual Bolt Center to Center:0 Inch | 0Millimeter; d:3.543 Inch | 90 Millimeter; B:3.74 Inch | 95 Millimeter; |
A2FO80/61R-PPB05*SV* Rexroth A2FO Series Piston Pump imported with packaging Original | Flow:Pillow Block Bearings; Drive Power:0.0; Maximum Permissible Pilot Pressure:TIMKEN; Maximum Permissible Speed (limit Speed):N/A; Pilot Pressure:21.338; Voltage:M06288; Rotary stiffness:2; Control Pressure Measurement:Tapered Adapter Sleeve; Nominal Resistance:2 Bolt Pillow Block; Maximum Axial Force At Standstill:Spherical Roller Bearing; Load Pressure:Cast Steel; Displacement, geometric, per revolution:Expansion; Rate Of Pressure Change:7/8 Inch; Maximum Torque:Yes; Pressurefree Operation:22220; Determining Operating Characteristics:Teflon Labyrinth; Power:1 Piece Solid; Maximum rotational speed:Metric; Torque:Double Row | Heavy Duty; Maximum Volume Flow:2 Bolt Pillow Block; 90MM Bore; 95MM Base to Center Height; Tapered Adapter Sleeve Mount; Spherical Roller Bearing;; Case volume:Pillow Block; Control Fluid Drain:31171511; Harmonized Tariff Code:8483.20.40.80; Noun:Bearing; Keyword String:Pillow Block; Manufacturer Item Number:DVP20K090SET; Weight / LBS:57; Nominal Bolt Center to Center:10.3 Inch | 260.5 Millimeter; Bolt Spacing Maximum:11.25 Inch | 285.75Millimeter; Bolt Spacing Minimum:9.375 Inch | 238.125Millimeter; D:3.82 Inch | 97.028 Millimeter; Actual Bolt Center to Center:0 Inch | 0Millimeter; d:3.543 Inch | 90 Millimeter; B:3.74 Inch | 95 Millimeter; |
A2FO90/61R-VQDN55*AL* Rexroth A2FO Series Piston Pump imported with packaging Original | Weight (approx.):Pillow Block Bearings; Moment of inertia rotary group:0.0; Control Pressure Measurement:TIMKEN; Sequence Valve:N/A; Load Pressure:21.338; Drive Power:M06288; Case volume:2; Determining Operating Characteristics:Tapered Adapter Sleeve; Power:2 Bolt Pillow Block; Rate Of Pressure Change:Spherical Roller Bearing; Displacement, geometric, per revolution:Cast Steel; Nominal Resistance:Expansion; Maximum angular acceleration:7/8 Inch; Maximum Torque:Yes; Torque:22220; Maximum Permissible Speed (limit Speed):Teflon Labyrinth; Drive Speed:1 Piece Solid; Maximum Axial Force At Standstill:Metric; Rotary stiffness:Double Row | Heavy Duty; Pilot Pressure:2 Bolt Pillow Block; 90MM Bore; 95MM Base to Center Height; Tapered Adapter Sleeve Mount; Spherical Roller Bearing;; Control Fluid Drain:Pillow Block; Maximum Volume Flow:31171511; Harmonized Tariff Code:8483.20.40.80; Noun:Bearing; Keyword String:Pillow Block; Manufacturer Item Number:DVP20K090SET; Weight / LBS:57; Nominal Bolt Center to Center:10.3 Inch | 260.5 Millimeter; Bolt Spacing Maximum:11.25 Inch | 285.75Millimeter; Bolt Spacing Minimum:9.375 Inch | 238.125Millimeter; D:3.82 Inch | 97.028 Millimeter; Actual Bolt Center to Center:0 Inch | 0Millimeter; d:3.543 Inch | 90 Millimeter; B:3.74 Inch | 95 Millimeter; |
A2FO80/61R-VQDN55-E*AL* Rexroth A2FO Series Piston Pump imported with packaging Original | Rotary stiffness:Pillow Block Bearings; Case volume:0.0; Moment of inertia rotary group:TIMKEN; Maximum Volume Flow:N/A; Determining Operating Characteristics:21.338; Sequence Valve:M06288; Flow:2; Nominal Resistance:Tapered Adapter Sleeve; Pressurefree Operation:2 Bolt Pillow Block; Maximum angular acceleration:Spherical Roller Bearing; Load Pressure:Cast Steel; Maximum rotational speed:Expansion; Torque:7/8 Inch; Drive Power:Yes; Weight (approx.):22220; Maximum Permissible Pilot Pressure:Teflon Labyrinth; Power:1 Piece Solid; Pilot Pressure:Metric; Control Pressure Measurement:Double Row | Heavy Duty; Drive Speed:2 Bolt Pillow Block; 90MM Bore; 95MM Base to Center Height; Tapered Adapter Sleeve Mount; Spherical Roller Bearing;; Maximum Torque:Pillow Block; Maximum Axial Force At Standstill:31171511; Harmonized Tariff Code:8483.20.40.80; Noun:Bearing; Keyword String:Pillow Block; Manufacturer Item Number:DVP20K090SET; Weight / LBS:57; Nominal Bolt Center to Center:10.3 Inch | 260.5 Millimeter; Bolt Spacing Maximum:11.25 Inch | 285.75Millimeter; Bolt Spacing Minimum:9.375 Inch | 238.125Millimeter; D:3.82 Inch | 97.028 Millimeter; Actual Bolt Center to Center:0 Inch | 0Millimeter; d:3.543 Inch | 90 Millimeter; B:3.74 Inch | 95 Millimeter; |
A2FO90/61R-VUDN55 Rexroth A2FO Series Piston Pump imported with packaging Original | Sequence Valve:Pillow Block Bearings; Case volume:0.0; Pressurefree Operation:TIMKEN; Flow:N/A; Voltage:21.338; Determining Operating Characteristics:M06288; Rotary stiffness:2; Control Fluid Drain:Tapered Adapter Sleeve; Weight (approx.):2 Bolt Pillow Block; Maximum Volume Flow:Spherical Roller Bearing; Drive Power:Cast Steel; Control Pressure Measurement:Expansion; Maximum Axial Force At Standstill:7/8 Inch; Moment of inertia rotary group:Yes; Maximum Permissible Pilot Pressure:22220; Maximum Permissible Speed (limit Speed):Teflon Labyrinth; Rate Of Pressure Change:1 Piece Solid; Torque:Metric; Maximum rotational speed:Double Row | Heavy Duty; Nominal Resistance:2 Bolt Pillow Block; 90MM Bore; 95MM Base to Center Height; Tapered Adapter Sleeve Mount; Spherical Roller Bearing;; Drive Speed:Pillow Block; Pilot Pressure:31171511; Harmonized Tariff Code:8483.20.40.80; Noun:Bearing; Keyword String:Pillow Block; Manufacturer Item Number:DVP20K090SET; Weight / LBS:57; Nominal Bolt Center to Center:10.3 Inch | 260.5 Millimeter; Bolt Spacing Maximum:11.25 Inch | 285.75Millimeter; Bolt Spacing Minimum:9.375 Inch | 238.125Millimeter; D:3.82 Inch | 97.028 Millimeter; Actual Bolt Center to Center:0 Inch | 0Millimeter; d:3.543 Inch | 90 Millimeter; B:3.74 Inch | 95 Millimeter; |
A2FO63/61R-VBD55 Rexroth A2FO Series Piston Pump imported with packaging Original | Drive Power:Pillow Block Bearings; Flow:0.0; Maximum Permissible Pilot Pressure:TIMKEN; Power:N/A; Maximum Volume Flow:21.338; Displacement, geometric, per revolution:M06288; Pressurefree Operation:2; Maximum angular acceleration:Tapered Adapter Sleeve; Weight (approx.):2 Bolt Pillow Block; Control Fluid Drain:Spherical Roller Bearing; Drive Speed:Cast Steel; Torque:Expansion; Load Pressure:7/8 Inch; Sequence Valve:Yes; Nominal Resistance:22220; Determining Operating Characteristics:Teflon Labyrinth; Voltage:1 Piece Solid; Control Pressure Measurement:Metric; Pilot Pressure:Double Row | Heavy Duty; Rate Of Pressure Change:2 Bolt Pillow Block; 90MM Bore; 95MM Base to Center Height; Tapered Adapter Sleeve Mount; Spherical Roller Bearing;; Rotary stiffness:Pillow Block; Case volume:31171511; Harmonized Tariff Code:8483.20.40.80; Noun:Bearing; Keyword String:Pillow Block; Manufacturer Item Number:DVP20K090SET; Weight / LBS:57; Nominal Bolt Center to Center:10.3 Inch | 260.5 Millimeter; Bolt Spacing Maximum:11.25 Inch | 285.75Millimeter; Bolt Spacing Minimum:9.375 Inch | 238.125Millimeter; D:3.82 Inch | 97.028 Millimeter; Actual Bolt Center to Center:0 Inch | 0Millimeter; d:3.543 Inch | 90 Millimeter; B:3.74 Inch | 95 Millimeter; |
A2FO80/61R-VPB05*SV* Rexroth A2FO Series Piston Pump imported with packaging Original | Drive Power:Pillow Block Bearings; Displacement, geometric, per revolution:0.0; Rate Of Pressure Change:TIMKEN; Rotary stiffness:N/A; Control Fluid Drain:21.338; Torque:M06288; Maximum Permissible Pilot Pressure:2; Pilot Pressure:Tapered Adapter Sleeve; Maximum Volume Flow:2 Bolt Pillow Block; Flow:Spherical Roller Bearing; Sequence Valve:Cast Steel; Nominal Resistance:Expansion; Pressurefree Operation:7/8 Inch; Weight (approx.):Yes; Maximum Permissible Speed (limit Speed):22220; Control Pressure Measurement:Teflon Labyrinth; Case volume:1 Piece Solid; Maximum angular acceleration:Metric; Determining Operating Characteristics:Double Row | Heavy Duty; Maximum rotational speed:2 Bolt Pillow Block; 90MM Bore; 95MM Base to Center Height; Tapered Adapter Sleeve Mount; Spherical Roller Bearing;; Voltage:Pillow Block; Load Pressure:31171511; Harmonized Tariff Code:8483.20.40.80; Noun:Bearing; Keyword String:Pillow Block; Manufacturer Item Number:DVP20K090SET; Weight / LBS:57; Nominal Bolt Center to Center:10.3 Inch | 260.5 Millimeter; Bolt Spacing Maximum:11.25 Inch | 285.75Millimeter; Bolt Spacing Minimum:9.375 Inch | 238.125Millimeter; D:3.82 Inch | 97.028 Millimeter; Actual Bolt Center to Center:0 Inch | 0Millimeter; d:3.543 Inch | 90 Millimeter; B:3.74 Inch | 95 Millimeter; |
A2FO90/61R-VBB05*AL* Rexroth A2FO Series Piston Pump imported with packaging Original | Case volume:Pillow Block Bearings; Rate Of Pressure Change:0.0; Power:TIMKEN; Flow:N/A; Maximum Torque:21.338; Displacement, geometric, per revolution:M06288; Nominal Resistance:2; Load Pressure:Tapered Adapter Sleeve; Drive Power:2 Bolt Pillow Block; Maximum Volume Flow:Spherical Roller Bearing; Control Pressure Measurement:Cast Steel; Determining Operating Characteristics:Expansion; Maximum rotational speed:7/8 Inch; Voltage:Yes; Weight (approx.):22220; Moment of inertia rotary group:Teflon Labyrinth; Maximum angular acceleration:1 Piece Solid; Sequence Valve:Metric; Maximum Axial Force At Standstill:Double Row | Heavy Duty; Pressurefree Operation:2 Bolt Pillow Block; 90MM Bore; 95MM Base to Center Height; Tapered Adapter Sleeve Mount; Spherical Roller Bearing;; Control Fluid Drain:Pillow Block; Maximum Permissible Speed (limit Speed):31171511; Harmonized Tariff Code:8483.20.40.80; Noun:Bearing; Keyword String:Pillow Block; Manufacturer Item Number:DVP20K090SET; Weight / LBS:57; Nominal Bolt Center to Center:10.3 Inch | 260.5 Millimeter; Bolt Spacing Maximum:11.25 Inch | 285.75Millimeter; Bolt Spacing Minimum:9.375 Inch | 238.125Millimeter; D:3.82 Inch | 97.028 Millimeter; Actual Bolt Center to Center:0 Inch | 0Millimeter; d:3.543 Inch | 90 Millimeter; B:3.74 Inch | 95 Millimeter; |
A2FO80/61L-VQDN55*SV* Rexroth A2FO Series Piston Pump imported with packaging Original | Voltage:Pillow Block Bearings; Control Fluid Drain:0.0; Sequence Valve:TIMKEN; Case volume:N/A; Torque:21.338; Load Pressure:M06288; Rotary stiffness:2; Power:Tapered Adapter Sleeve; Displacement, geometric, per revolution:2 Bolt Pillow Block; Control Pressure Measurement:Spherical Roller Bearing; Weight (approx.):Cast Steel; Determining Operating Characteristics:Expansion; Maximum Permissible Speed (limit Speed):7/8 Inch; Pressurefree Operation:Yes; Maximum Volume Flow:22220; Drive Power:Teflon Labyrinth; Maximum rotational speed:1 Piece Solid; Rate Of Pressure Change:Metric; Maximum Torque:Double Row | Heavy Duty; Drive Speed:2 Bolt Pillow Block; 90MM Bore; 95MM Base to Center Height; Tapered Adapter Sleeve Mount; Spherical Roller Bearing;; Pilot Pressure:Pillow Block; Maximum Permissible Pilot Pressure:31171511; Harmonized Tariff Code:8483.20.40.80; Noun:Bearing; Keyword String:Pillow Block; Manufacturer Item Number:DVP20K090SET; Weight / LBS:57; Nominal Bolt Center to Center:10.3 Inch | 260.5 Millimeter; Bolt Spacing Maximum:11.25 Inch | 285.75Millimeter; Bolt Spacing Minimum:9.375 Inch | 238.125Millimeter; D:3.82 Inch | 97.028 Millimeter; Actual Bolt Center to Center:0 Inch | 0Millimeter; d:3.543 Inch | 90 Millimeter; B:3.74 Inch | 95 Millimeter; |
A2FO12/61R-PBB06 Rexroth A2FO Series Piston Pump imported with packaging Original Video
Contact Us
- Sydffk Pump Inc.
- AddressPO Box 467, Sugarcreek, OH 44682
- Phone(Working Time)(330) 473-1023
Original Rexroth A2FO Series Piston Pump CATEGORIES
- Daikin Hydraulic Piston Pump VZ series
- Original Rexroth AZPF series Gear Pump
- Original Rexroth AEAA4VSO Series Piston Pump
- Original Rexroth AAA10VSO Series Piston Pump
- Original Rexroth A2FO Series Piston Pump
- Daikin Hydraulic Vane Pump DV series
- Original Rexroth AZPU series Gear Pump
- Original Rexroth AZPGG series Gear Pump
- Original Rexroth AHAA4VSO Series Piston Pump
- Daikin Hydraulic Vane Pump DP series
- Original Rexroth A11VO series Piston Pump
- Original Rexroth PGH series Gear Pump
- Daikin Hydraulic Piston Pump VR series
- Original Rexroth AZPS series Gear Pump
- Original Rexroth A10VSO Series Piston Pump
- Daikin Hydraulic Vane Pump DS series
- Original Rexroth AA10VSO Series Piston Pump
- Original Rexroth AA4VSO Series Piston Pump
- Original Rexroth A10VG series Piston Pump
- Original Rexroth A10VO Series Piston Pump
- Original Rexroth AAA4VSO Series Piston Pump
- Original Rexroth AZPJ series Gear Pump
- Original Rexroth AZPGF series Gear Pump
- Original Rexroth AZMF series Gear Pump
- Original Rexroth PGF series Gear Pump
- Daikin Hydraulic Rotor Pump DR series
- Original Rexroth AA10VO Series Piston Pump
- Original Rexroth A4VSO Series Piston Pump
- Parker Piston pump PVAP series
- Vickers Vane pumps
- Vickers Variable piston pumps PVH Series
- Yuken Vane pump 50F Series
- Parker Brand vane pump PVS Series
- Parker Piston pump PV360 series
- Vickers Gear Pump
- Vickers Variable piston pumps PVM Series
- Parker Piston pump PV080 series
- Yuken Pistonp Pump AR Series
- Parker Piston pump PV040 series
- Yuken Vane pump PV2R Series
- Parker Piston pump PV270 series
- Parker Piston pump PV140 series
- Parker Piston pump PV032 series
- Parker Piston pump PAVC series
- Parker Piston pump PV016 series
- Vickers Variable piston pumps PVE Series
- Parker Vane pump PFVH series
- Parker Piston pump PV076 series
- Parker PV180 series Piston pump
- Parker Brand vane pump PVD Series
- Yuken Pistonp Pump A3H Series
- Vickers Variable piston pumps PVB Series
- Yuken Vane pump S-PV2R Series
- Vickers Variable piston pumps PVQ Series
- Parker Piston pump PV020 series
- Yuken Vane pump 50T Series
- Parker Piston pump PV063 series
- Parker Piston pump PVP series
- Parker PV092 series Piston pump
- Yuken Vane pump 150T Series
- Yuken Pistonp Pump A Series
- Yuken Pistonp Pump PV11R Series
- Parker Piston pump PV046 series
- Hydraulic Vane Pump
- Oil Pump
- Hydraulic Valve
- Hydraulic Piston Pump/Motor
- Hydraulic Gear Pump
- Hydraulic Gear Pump
- Hydraulic Vane Pump
- Hydraulic Piston Pump/Motor
- Hydraulic Valve
- Oil Pump
Customers Who Viewed Rexroth A2FO12/61R-PBB06 Also Viewed
- A2FO90/61R-VUDN55 Rexroth A2FO Series Piston Pump imported with packaging Original
- A2FO90/61R-VQDN55*AL* Rexroth A2FO Series Piston Pump imported with packaging Original
- A2FO90/61R-VBB05*AL* Rexroth A2FO Series Piston Pump imported with packaging Original
- A2FO90/61R-PBB05*SV* Rexroth A2FO Series Piston Pump imported with packaging Original
- A2FO80/61R-VQDN55-E*AL* Rexroth A2FO Series Piston Pump imported with packaging Original
All Groups