KAWASAKI K3V HYDRAULIC PUMP SUPPLIER
KAWASAKI K3V HYDRAULIC PUMP SUPPLIER
Kawasaki K3v Hydraulic Pump   Kawasaki K3vg Variable Displacement Axial Piston Pump   Linde Hpr Hydraulic Pump  
English
English
  • Home
  • Stock Categories
    • Kawasaki K3v Hydraulic Pump
    • Kawasaki K3vg Variable Displacement Axial Piston Pump
    • Linde Hpr Hydraulic Pump
    • Bosch Rexroth A4v Variable Pumps
    • Bosch Rexroth A4vso Variable Displacement Pumps
    • Bosch Rexroth A11vg Hydraulic Pumps
    • Bosch Rexroth A15vso Axial Piston Pump
    • Bosch Rexroth A4vtg Axial Piston Variable Pump
    • Kawasaki K5v Hydraulic Pump
    • Bosch Rexroth A4vg Variable Displacement Pumps
    • Bosch Rexroth A2fo Fixed Displacement Pumps
    • Bosch Rexroth A2v Variable Displacement Pumps
    • Bosch Rexroth A10vo Piston Pumps
    • Bosch Rexroth A10vso Variable Displacement Pumps
    • Bosch Rexroth A4vsg Axial Piston Variable Pump
    • Bosch Rexroth A11vlo Axial Piston Variable Pump
    • Bosch Rexroth A10vno Axial Piston Pumps
    • Bosch Rexroth A7vo Variable Displacement Pumps
    • Bosch Rexroth A11vo Axial Piston Pump
    • Bosch Rexroth A8vo Variable Displacement Pumps
    • Bosch Rexroth A10vg Axial Piston Variable Pump
    • Kawasaki K3vl Axial Piston Pump
  • Technical Articles
  • Kawasaki K3v Hydraulic Pump
  • Kawasaki K3vg Variable Displacement Axial Piston Pump
  • Linde Hpr Hydraulic Pump
✖

Home

Stock Categories

Technical Articles

Kawasaki K3v Hydraulic Pump

Kawasaki K3vg Variable Displacement Axial Piston Pump

Linde Hpr Hydraulic Pump

Home>Products>Bosch Rexroth A15vso Axial Piston Pump>A2F225 BOSCH REXROTH A2F PISTON PUMPS

  • A2F225 BOSCH REXROTH A2F PISTON PUMPS
  • A2F225 BOSCH REXROTH A2F PISTON PUMPS

BOSCH REXROTH A2F225 MODELS

Need a CAD or 3D Model?

What is A2F225 bearing cross reference?
Contact NowWhatsAppBe Our Agent

A2F225 BOSCH REXROTH A2F PISTON PUMPS

category

Bosch Rexroth A15vso Axial Piston Pump

BOSCH REXROTH A2F225 Bearing SPECIFICATIONS

  • A2F225 BOSCH REXROTH A2F PISTON PUMPS, Units and Housings CAD models , Bosch Rexroth A15vso Axial Piston Pump Manufacturing Service . Nylon Retainer Material Get Your Free.

  • BOSCH REXROTH
  • A2F225

  • Nylon
  • Std Retainer
  • Unirex N2
  • Zinc
  • Steel
  • Normal Duty
  • Concentric Clamp Col
  • 5500 rpm
KAWASAKI K3V HYDRAULIC PUMP SUPPLIER

KAWASAKI K3V HYDRAULIC PUMP SUPPLIERChina

  • KAWASAKI K3V HYDRAULIC PUMP SUPPLIER2020-07-10 09:46:19
    Welcome to my shop! Glad to serve you! Please send your question!
Price Inspection Certificate Product Specifications Company Profile

A2F225 BOSCH REXROTH A2F PISTON PUMPS Description of the code

  • Nylon
  • Std Retainer
  • Unirex N2
  • Zinc
  • Steel
  • Normal Duty
  • Concentric Clamp Col
  • 5500 rpm
  • D-Lock Ball Bearing
  • Steel
  • Class 10
  • 1.2500 in
  • Yes
  • Rogersville, TN
  • 1.75 LB
  • Steel
  • 2 Bolt Light Duty Fl
  • Non-Expansion
  • No
  • Steel

BOSCH REXROTH A2F225 A2F225 BOSCH REXROTH A2F PISTON PUMPS Details

 

A20VG045DG1000M10/10AR-NB2S73DB2S43 BOSCH REXROTH A20VG VARIABLE PUMPSBearing Inner Ring Material:Steel; Shaft Attachment (2):Grip Tight; Bearing Family:Grip Tight Ball Bear; Ball Bearing Housing Series:211 Series; Flinger Type:Standard; Bearing Series:211 Series; Self Aligning:Self Centering; Housing Type:2 Bolt Pillow Block; Housing Material:Cast Iron; Bearing Duty:Normal Duty; Retainer Type:Std Retainer; Ship Weight:6.87 LB; Grease Type:Unirex N2; UPC:782475881628;
A18VO080DRS00/11NRWK0E810-0 77722.3115 BOSCH REXROTH A18VO AXIAL PISTON PUMPMax Bearing Speed:7500 rpm; Bearing Insert Material:Steel; Bearing Duty:Normal Duty; d:0.6250 in; UPC:782476243852; Ship Weight:1.08 LB; Retainer Material:Nylon; Expansion Type:Non-Expansion; Housing Coating:Powder Coat; Ring Size:Standard; Bearing Bore Shape:Round; Bearing Series:203 Series; Bearing Inner Ring Material:Steel; Bearing Locking Device:Setscrew; Anti-Rotation Pin:Yes; End Cap Groove:No;
A20VLO260LG1DU2-10R-NTD24K17R BOSCH REXROTH A20VLO HYDRAULIC PUMPUPC:782475018093; Housing Type:Type B Babbitted Tak; Bearing Locking Device:N/A; Split Housing:NO; Bearing Insert Material:Steel; Base to Center Height:Not Applicable; Housing Coating:No Coating; Housing Material:Zinc; Metric Housing Dimensions:NO; Bearing Family:SLEEVE BEARING; Expansion Type:Non-Expansion; Bearing Bore Shape:Round; Ship Weight:1 LB;
AL A20VO 520 LR3DN /10L-VZH26K00-S2343 BOSCH REXROTH A20VO HYDRAULIC AXIAL PISTON PUMPHousing Type:2 Bolt Flange; Shaft Attachment (2):Eccentric Collar; Bearing Outer Ring Material:Steel; Bearing Duty:Normal Duty; Ring Size:Standard; Manufacturing Plant Location:Rogersville, TN; Housing Material:Cast Iron; Max Bearing Speed:5500 rpm; Self Aligning:Self Centering; Bearing Inner Ring Material:Steel; Bearing Insert Material:Steel; Expansion Type:Non-Expansion; Ball Grade:Class 10; Anti-Rotation Pin:Yes;
A15VSO210LRDRS0A0V/10MRVE4A21EU0000- BOSCH REXROTH A15VSO AXIAL PISTON PUMPDI_:15.314; hidTable:ecat_NSANGB; B_:11; SDM_:22.5; mass:0.106; C:15.1; hidYobi:7300AWDB; Z_:8; Oil rpm:17000; Prod_Type3:ACBB_SR_MM_DB; da:15; D_:35; r1:0.3; r:0.6; C0:8.6; SRI:3.71; ALPHA_:30; DA_:7.144; SRIX:0.04; m0:0.276;
A20VLO190EP2D/10L-NZD24K02P-S BOSCH REXROTH A20VLO HYDRAULIC PUMPRetainer Material:Nylon; UPC:782475961573; Ship Weight:14.8 LB; Bearing Insert Material:Steel; Bearing Duty:Medium Duty; Bearing Outer Ring Material:Steel; d:65.0000 mm; Housing Type:4 Bolt Flange; Housing Coating:Powder Coat; Base to Center Height:Not Applicable; Flinger Material:Stainless Steel; Bearing Series:214 Series; Bearing Bore Shape:Round; Bearing Locking Device:Concentric Clamp Col; Anti-Rotation Pin:Yes;
A17FO107/10NLWK0E81-0 *GO2EU* BOSCH REXROTH A17FO AXIAL PISTON PUMPUPC:782475483211; Ship Weight:25 LB; Angle Size:2-1/2 X 2-1/2 X 5/16; Take-Up Frame Travel:12.0000 in; Material Type:CARBON STEEL; Screw Treatment:STAINLESS STEEL; Special Coating:STANDARD PAINT; Screw Diameter:0.7500 in; Take-Up Frame Style:LIGHT DUTY; Frame Size:40;
AA20VLO190EPXD/10R-NXDXXN00XP-S BOSCH REXROTH A20VLO HYDRAULIC PUMPB_:9; SRE:2.48; C0:8.1; DI_:23.73; d:20; D_a:34.5; Prod_Type3:ACBB_SR_MM_DF; hidYobi:7904A5TYNDF; C:10.7; D_:37; yobi:7904A5TYNDF; rb:0.3; Z_:13; r1:0.15; SBRG:19; SDM_:28.513; ao:4.3; GRS rpm:19000; ALP21:25; m0:0.228;
AA20VLO260LRDH1/10R-NXD74N00X-S BOSCH REXROTH A20VLO HYDRAULIC PUMPX0:1; SDM_:823.87; SIR:123; X1:1; Prod_Type3:SRB_CTB_TB; C0:19500; hidYobi:240/670CAMK30E4; r:7.5; DE_:899.836; DI_:747.903; D_a max:944; yobi:240/670CAMK30E4; DA_:77.5; D_a min:868; Y3:2.2; Z_:27; C:8450; LangID:1; e:0.3; ALP1:11;
A22VG045HT1003M1/11BRNB2S73UB2S5A-O BOSCH REXROTH A22VG PISTON PUMPHousing Type:3 Bolt Light Duty Fl; Bearing Inner Ring Material:Steel; Ball Material:Steel; Bearing Series:205 Series; Max Bearing Speed:12000 rpm; Ball Grade:Class 10; Expansion Type:Non-Expansion; UPC:782475996636; Ship Weight:1 LB; Ring Size:Standard; Bearing Insert Material:Steel; Bearing Family:Grip Tight Ball Bear; Flinger Type:Rubberized; Self Aligning:Yes; Seal Type:Single Lip; Ball Bearing Housing Series:205 Series;
A15VSO280DRS0A0V/10MRVE4A41EU0000- BOSCH REXROTH A15VSO AXIAL PISTON PUMPHousing Type:2 Bolt Pillow Block; Expansion Type:Non-Expansion; Grease Type:Mobilgrease FM222; Bearing Locking Device:Tapered Adapter Slee; Bearing Inner Ring Material:Steel; Base to Center Height:Standard; Bearing Family:Grip Tight Ball Bear; Retainer Type:Max Life Cage; Housing Coating:No Coating; Flinger Type:INTERNAL RUBBER LIP; Manufacturing Plant Location:Rogersville, TN; Bearing Bore Shape:Round;
A2F5/60L-C7-S BOSCH REXROTH A2F PISTON PUMPSFlinger Material:Steel; Ship Weight:3.8 LB; Expansion Type:Non-Expansion; Housing Coating:Powder Coat; Manufacturing Plant Location:Rogersville, TN; Anti-Rotation Pin:Yes; Bearing Locking Device:Setscrew; Seal Type:Triple Lip; Retainer Material:Polymer; d:1.4375 in; Bearing Series:207 Series; Flinger Type:Rubberized; Bearing Outer Ring Material:Steel; Ball Grade:Class 10; Ball Material:Steel; UPC:782476483463;
A20VO 60 DFR/10R-VSD24K68-SO969 BOSCH REXROTH A20VO HYDRAULIC AXIAL PISTON PUMPHousing Type:2 Bolt Flange; Expansion Type:Non-Expansion; End Cap Groove:Yes; Bearing Family:Setscrew Ball Bearin; Ship Weight:1.81 LB; Ball Grade:Class 10; Flinger Type:Rubberized; Flinger Material:Steel; Bearing Outer Ring Material:Steel; Bearing Duty:Normal Duty; Ball Bearing Housing Series:206 Series; Anti-Rotation Pin:Yes; Bearing Insert Material:Steel; UPC:782475247301; d:1.2500 in; Housing Coating:Powder Coat;
A2FSL500W5Z1 GLRD BOSCH REXROTH A2F PISTON PUMPSHousing Material:Cast Iron; d:1.7500 in; Ring Size:Standard; Manufacturing Plant Location:Rogersville, TN; Ball Bearing Housing Series:209 Series; Self Aligning:Self Centering; Ball Material:Steel; Bearing Insert Material:Steel; UPC:782476503604; Retainer Material:Nylon; End Cap Groove:No; Bearing Series:209 Series; Base to Center Height:Standard; Grease Type:Unirex N2; Expansion Type:Expansion; Housing Type:2 Bolt Pillow Block;
AA20VLO260LG2S-10R-NXD74N00X-S BOSCH REXROTH A20VLO HYDRAULIC PUMPmass:22.4; ra:3; r:4; C:315; D_:340; ALPHA_:30; hidYobi:7238A; D_a:322; SBRG:2; C0:410; SRI:21.46; SDM_:264.977; DE_:306.494; LangID:1; DI_:223.46; Oil rpm:2200; DA_:41.275; KBRG:7024; a:104; SREX:0.16;
A2F5-60R-B7 BOSCH REXROTH A2F PISTON PUMPSyobi:7028ADB; C_conv:194000; SREX:0.08; SRIX:0.08; C0:265; C:194; D_b:204; SBRG:10; Oil rpm:3400; r:2; Prod_Type3:ACBB_SR_MM_DB; DA_:20.638; hidYobi:7028ADB; KBRG:7124; da:150; LangID:1; SDM_:174.984; SRI:10.73; ALPHA_:30; Z_:22;

 

 

No.BranderGdTCXa
A20VO60DFR1-10R-NSD24K68-SO969BOSCH REXROTH - - - 220 - 815 - -
A17VO107 DRS00/11NRWK0E810-BOSCH REXROTH - - - 30.0000 mm - - - -
A20VLO190LG2H2/10R-NZD24K07BOSCH REXROTH - - - 30.0000 mm - - - -
A2F45BOSCH REXROTH - - - 1.0000 in - - - -
A15VSO210LRDRA0V/10MLVE4B21EU0000-BOSCH REXROTH - - - - - - - -
AL A20VO 520 LR3DN /10L-VZH26K00-S1861BOSCH REXROTH - - - 80 - - - -
AA2F1000L5Z1-V-SOBOSCH REXROTH - - - 10 - 8.8 - -
A20VLO190LG1S/10R-NZD24K02-SBOSCH REXROTH - 4 - - - 665 - -
A17VO080DRS00/11NLWK0E810-0 77722.3216BOSCH REXROTH - 4 - 180 - 495 - -
A2F28W3Z8BOSCH REXROTH0.211.1 - 45 - - - -
A2F107W1P6BOSCH REXROTH - - - - - - - -
AA20VLO190DR/10L-WXD07N00T-SBOSCH REXROTH - - - 1.4375 in - - - -
A A20VFO 260 LR2DY/30R-VPB26U99BOSCH REXROTH - - - 2.9375 in - - - -
AA20VLO260LG2S/10R-NXDXXN00X-SBOSCH REXROTH - 4 - 130 - 615 - -
A20VO60DFR1-10R-NSD24K52-SO2BOSCH REXROTH - 4 - - - - - -
A2F125W2PXBOSCH REXROTH - - - 55 - - - -
A18FDO063/10MLWK0E81-BOSCH REXROTH - - - 3.4375 in - - - -
A20VO60DFR1-10R-VSD24K01BOSCH REXROTH - - - 45 - 63 - -
A2F5/60R-B7-S POMP REXROTHBOSCH REXROTH - - - 1.0000 in - - - -
A22VG045EP1P0100/40BRNB2XX3UB2S5A-SBOSCH REXROTH - 1.1 - 85 - - - -
A20VLO260LRS/10R-NZD24K01BOSCH REXROTH - - - 2.9375 in - - - -
A A2F 1000 XSP2BOSCH REXROTH - - - 1.8750 in - - - -
A20VLO260LR-10R-NZD24K07-SBOSCH REXROTH - - - - - - - -
A20VLO260LRDH1-10R-NZD24K24-SBOSCH REXROTH - 3 - 85 - 291 - -
AL A20VO 520 LR3DN /10L-VZH26K00-S2344BOSCH REXROTH - - - 0.9375 in - - - -
A15VSO280DRA0V/10MRVE4A41EE4A40-BOSCH REXROTH - - - 2.9375 in - - - -
A20VLO190LE2DH2/10R-NZD24K02BOSCH REXROTH - - - 2.0000 in - - - -
A A2F-SL 355 W5Z1-VBOSCH REXROTH - - - 80 - - - -
A15VSO280LRDRE2AHV/10MRVE4A41EU0000-BOSCH REXROTH - - - 180 - 227 - -

 

A2F225 BOSCH REXROTH A2F PISTON PUMPS Video

 

Axial piston variable pump A15VSO, A15VLO series 10

Bosch Rexroth AG, RE 92800/10.2013. 2. A15VSO, A15VLO series 10 | Axial piston variable pump. Ordering code. Axial piston unit.

Bosch Rexroth A15VSO Catalog, Page 1 - SP-SpareParts

Rexroth - A15VSO. Rexroth · Industrial Hydraulics · Pumps · Axial piston pumps · Variable pumps, open circuit · A15VSO. Rexroth catalog for A15VSO.

Rexroth releases A15VSO hydraulic axial-piston pump

March 26, 2014 - Rexroth releases A15VSO hydraulic axial-piston pump for stationary applications in open circuit operation. It can meet pressure requirements to ...

Bosch Rexroth A15VSO Axial Piston Pump - Series 10

The Bosch Rexroth A15VSO pump is a high pressure, variable displacement axial piston pump with through drive. It has a swashplate design for use in open ...

Axial piston variable pump | Bosch Rexroth AG

A15VSO series 1x · All-purpose high pressure pump with through drive · Size 110 … 280 · Nominal pressure 350 bar · Maximum pressure 420 bar · Open circuit.

New A15VSO high-pressure axial-piston pump from Rexroth

Apr 3, 2014 — Rexroth. Further design improvements bring the overall efficiency of the axial-piston pump up to 93 percent. The swivel range, for example, ...

Rexroth Axial Piston Variable Pump A15VSO

HEASH TECH, who is very know Rexroth hydraulics, supply hydraulic valves, pumps and motors to meet with your demand on industrial and mobile hydraulics.

Axial Piston Variable Displacement Pump A15VSO series 10

Axial Piston Variable Displacement Pump A15VSO series 10. Axial Piston Pumps ... Bosch Rexroth Axial Piston Variable Pump R902197657 / A4VG90DGD1/32R.

Specifications Rexroth Variable Axial Piston Pump A15VSO ...

Jul 30, 2012 — For description, see control device Connectors for other electric components can deviate. E. – = Not available. 4/40. Bosch Rexroth AG. A15VSO ...

A15VSO high-pressure axial piston unit from Rexroth with ...

Jan 12, 2015 — Bosch Rexroth Corporation, Corporate Communications ... improved efficiency in the A15VSO axial piston hydraulic pump for.

BOSCH REXROTH A2F225 INTERCHANGE

Bosch Rexroth A15vso Axial Piston Pump Part series A2F225 is a potential replacement for these common bearing part numbers:

  • A2F225

  • A2F225

  • A2F225

  • A2F225

  • A2F225

  • A2F225

  • A2F225

  • A2F225

Contact Us

KAWASAKI K3V HYDRAULIC PUMP SUPPLIER
Address
Phone(Working Time)
Fax
  • KAWASAKI K3V HYDRAULIC PUMP SUPPLIER
    • Quick question Quick question I'm very interested in your products; could you send me some detail reference information? Please send me detail product specification, thank you! May I be an agency of your products,and what's yourterms? We intend to purchase this product, would you please send me the quotation and minimum order quantity?
     This feature is Quick question function, select the corresponding question types, automatically enter the corresponding problem, remove your trouble of typing
Send Now

BOSCH REXROTH A2F225 Technical Articles

How does a variable hydraulic pump work?
Hydraulic Pump Working Principles | LinquipAug 4, 2021 — With a variable displacement pump, the displacement or volume of the pumped liquid per revolution of the pump shaft can be varied while the pump  Variable-displacement Pump Control Basics |...
How does a variable-displacement motor work?
Variable displacement motors - LiebherrAdjustable axial piston motors from Liebherr are suitable for use in open as well as closed hydraulic circuits. The innovative swashplate design enables  Variable displacement pump - WikipediaMany variable...
Is vane pump variable displacement?
What is a Vane Pump - Working, Types, and Applications3) Variable Displacement Vane Pump — A vane pump is a positive displacement pump that delivers a constant flow rate under different pressure conditions. It  Rotary vane pump -...

Bosch Rexroth A15vso Axial Piston Pump CATEGORIES

  • Kawasaki K3v Hydraulic Pump
  • Kawasaki K3vg Variable Displacement Axial Piston Pump
  • Linde Hpr Hydraulic Pump
  • Bosch Rexroth A4v Variable Pumps
  • Bosch Rexroth A4vso Variable Displacement Pumps
  • Bosch Rexroth A11vg Hydraulic Pumps
  • Bosch Rexroth A15vso Axial Piston Pump
  • Bosch Rexroth A4vtg Axial Piston Variable Pump
  • Kawasaki K5v Hydraulic Pump
  • Bosch Rexroth A4vg Variable Displacement Pumps
  • Bosch Rexroth A2fo Fixed Displacement Pumps
  • Bosch Rexroth A2v Variable Displacement Pumps
  • Bosch Rexroth A10vo Piston Pumps
  • Bosch Rexroth A10vso Variable Displacement Pumps
  • Bosch Rexroth A4vsg Axial Piston Variable Pump
  • Bosch Rexroth A11vlo Axial Piston Variable Pump
  • Bosch Rexroth A10vno Axial Piston Pumps
  • Bosch Rexroth A7vo Variable Displacement Pumps
  • Bosch Rexroth A11vo Axial Piston Pump
  • Bosch Rexroth A8vo Variable Displacement Pumps
  • Bosch Rexroth A10vg Axial Piston Variable Pump
  • Kawasaki K3vl Axial Piston Pump
More

Customers Who Viewed BOSCH REXROTH A2F225 Bearing Also Viewed

  • A2F5/60W-B3-S BOSCH REXROTH A2F PISTON PUMPS
  • A17VO107 DRS00/11NLWK0E810- BOSCH REXROTH A17VO AXIAL PISTON VARIABLE PUMP
  • A20VLO190LE2DH2+A10VO28DR-K BOSCH REXROTH A20VLO HYDRAULIC PUMP
  • A17VO107DRS00/ BOSCH REXROTH A17VO AXIAL PISTON VARIABLE PUMP
  • AA20VO95DRG-10L-VSD74N00-ES BOSCH REXROTH A20VO HYDRAULIC AXIAL PISTON PUMP
 
  • About Us|
  • Contact Us|
  • Site Map
  • Sitemaps

KAWASAKI K3V HYDRAULIC PUMP SUPPLIER. Copyright © 2017 - 2023 All Rights Reserved.

  • Home
  • Stock Categories
    • Kawasaki K3v Hydraulic Pump
    • Kawasaki K3vg Variable Displacement Axial Piston Pump
    • Linde Hpr Hydraulic Pump
    • Bosch Rexroth A4v Variable Pumps
    • Bosch Rexroth A4vso Variable Displacement Pumps
    • Bosch Rexroth A11vg Hydraulic Pumps
    • Bosch Rexroth A15vso Axial Piston Pump
    • Bosch Rexroth A4vtg Axial Piston Variable Pump
    • Kawasaki K5v Hydraulic Pump
    • Bosch Rexroth A4vg Variable Displacement Pumps
    • Bosch Rexroth A2fo Fixed Displacement Pumps
    • Bosch Rexroth A2v Variable Displacement Pumps
    • Bosch Rexroth A10vo Piston Pumps
    • Bosch Rexroth A10vso Variable Displacement Pumps
    • Bosch Rexroth A4vsg Axial Piston Variable Pump
    • Bosch Rexroth A11vlo Axial Piston Variable Pump
    • Bosch Rexroth A10vno Axial Piston Pumps
    • Bosch Rexroth A7vo Variable Displacement Pumps
    • Bosch Rexroth A11vo Axial Piston Pump
    • Bosch Rexroth A8vo Variable Displacement Pumps
    • Bosch Rexroth A10vg Axial Piston Variable Pump
    • Kawasaki K3vl Axial Piston Pump
  • Technical Articles
  • Kawasaki K3v Hydraulic Pump
  • Kawasaki K3vg Variable Displacement Axial Piston Pump
  • Linde Hpr Hydraulic Pump
✖

Home

Stock Categories

Technical Articles

Kawasaki K3v Hydraulic Pump

Kawasaki K3vg Variable Displacement Axial Piston Pump

Linde Hpr Hydraulic Pump

Contact Us