• |
  • Request a quote
English
English
RMF Hydraulic Pump Co., Ltd.

RMF Hydraulic Pump Co., Ltd.

 Rexroth PRESSURE RELIEF VALVE   Yuken Piston pump   Rexroth Vane pump  
  • Home
  • Stock Categories
    • Rexroth PRESSURE RELIEF VALVE
    • Yuken Piston pump
    • Rexroth Vane pump
    • PAKER Piston Pump
    • Rexroth check valve
    • Yuken single Vane pump
    • Rexroth THROTTLE VALVE
    • Danfoss Shut-off valves
    • Yuken pressure valve
    • Rexroth Piston Pump
    • DENISON vane pump
    • Rexroth Solenoid directional valve
    • Yuken Double Vane pump
    • BOSCH injector
    • DEUTZ injector
    • COMMON RAIL injector
    • Eaton Vickers ydraulic Pump
    • For Komatsu
    • For Rexroth
    • Gear Pump
    • Hydraulic Motor
    • Kawasaki ydraulic Pump
    • Original Hydraulic Pump
    • Parker Denison ydraulic Pump
    • Piston Pump
    • Replacement for CAT
    • Sauer ydraulic Pump
    • Vane Pump
    • Water Pump
    • Yuken Hydraulic Pump
  • Technical Articles
  • Rexroth PRESSURE RELIEF VALVE
  • Yuken Piston pump
  • Rexroth Vane pump
✖

Home

Stock Categories

Technical Articles

Rexroth PRESSURE RELIEF VALVE

Yuken Piston pump

Rexroth Vane pump

Home>Products>DEUTZ injector>DEUTZ 0 445 110 171/181/182/189/190 injector

  • DEUTZ 0 445 110 171/181/182/189/190 injector
  • DEUTZ 0 445 110 171/181/182/189/190 injector
  • DEUTZ 0 445 110 171/181/182/189/190 injector
  • DEUTZ 0 445 110 171/181/182/189/190 injector

DEUTZ 0 445 110 171/181/182/189/190 MODELS

Need a CAD or 3D Model?

What is 0 445 110 171/181/182/189/190 bearing cross reference？
Contact NowWhatsAppBe Our Agent

DEUTZ 0 445 110 171/181/182/189/190 injector

category

DEUTZ injector

DEUTZ 0 445 110 171/181/182/189/190 SPECIFICATIONS

  • DEUTZ injector are Cylindrical Roller B Category a Brass Cage Material few brands you will find in our inventory. Find DEUTZ 0 445 110 171/181/182/189/190 injector to see what's in stock!

  • DEUTZ

  • 0 445 110 171/181/182/189/190

  • 45.0 LB
  • Flange Mount
  • Right Hand (CW)
  • 2520VQ21A5-1DD20
  • 2.5
  • Flange
  • 3/16 in
  • Standard Pilot
RMF Hydraulic Pump Co., Ltd.

RMF Hydraulic Pump Co., Ltd.China

  • RMF Hydraulic Pump Co., Ltd.2020-07-10 09:46:19
    Welcome to my shop! Glad to serve you! Please send your question!
Price Inspection Certificate Product Specifications Company Profile

Code system DEUTZ 0 445 110 171/181/182/189/190 injector

  • 0.875 in
  • Straight w/ Key
  • 2520VQ
  • 1 15/16 in
  • Double
  • Buna-N
  • 2500
  • 4.1
  • SAE B, 2 Bolt
  • Single Shaft Seal
  • N/A
  • 2700
  • 2500
  • N/A
  • 5 gal/min @ 1200 rpm, 7.5 gal/min @ 1800 rpm
  • N/A
  • N/A
  • N/A
  • N/A
  • N/A
  • 21 gal/min @ 1200 rpm, 31.5 gal/min @ 1800 rpm
  • 2520VQ21A5-1DD20
  • 3000
  • 3000
  • 7.5
  • 31.5
  • w/o Integral Valves
  • Outlet 135° CW from Inlet
  • Outlet 90° CW from Inlet
  • 3/4 in Flange
  • 1 in Flange
  • 1.1

DEUTZ 0 445 110 171/181/182/189/190 Products and services DEUTZ 0 445 110 171/181/182/189/190 injector

DEUTZ 0 445 110 171/181/182/189/190 injector Cross Reference

No.BrandmdFSBEsT
AR 24 110 190KOYO - 110 mm - - - - - -
713617190FAG - - - - - - - -
713618110FAG - - - - - - - -
713618190FAG - - - - - - - -
SL181892NBS - 460 mm - 5 mm56 mm554 mm - -
SL181892-EINA - 460 mm– mm5 mm56 mm554 mm - -
SL181892-E-TBINA33,21 kg / Weight460 mm - - 56 mm554 mm5 mm / Axial displacement -
SL181896NBS - 480 mm - 5 mm56 mm474,5 mm - -
SL181896-EINA - 480 mm– mm5 mm56 mm474,5 mm - -
SL181896-E-TBINA34,53 kg / Weight480 mm - - 56 mm574,5 mm5 mm / Axial displacement -
181111X/ 181190Gamet - 111,125 mm12,7 mm - 50 mm - - 47,62 mm

 

DEUTZ 0 445 110 345 injectorPressure Port Size, Shaft End:45.0 LB; Displacement Shaft End (cu in/revolution):Flange Mount; Max. RPM [Max:Right Hand (CW); Model No.:2520VQ21A5-1DD20; Shaft Dia.:2.5; Port Orientation - Shaft End:Flange; Minor Diameter:3/16 in; Mounting Flange:Standard Pilot; Relief Valve Setting:0.875 in; Shaft End Pressure [Max:Straight w/ Key; Pump Series:2520VQ; Shaft Length:1 15/16 in; Configuration:Double; Seal Material:Buna-N; Max. RPM [Max:2500; Minor Diameter:N/A; Mounting Flange:SAE B, 2 Bolt; Shaft Seal Type:Single Shaft Seal; Spline Description:N/A; Cover End RPM [Max:2700; Shaft End RPM [Max:2500; Controlled Flow Rate:N/A; Cover End Flow @ RPM:5 gal/min @ 1200 rpm, 7.5 gal/min @ 1800 rpm; Major Diameter [Max:N/A; Major Diameter [Min:N/A; Minor Diameter [Max:N/A; Minor Diameter [Min:N/A; Relief Valve Setting:N/A; Shaft End Flow @ RPM:21 gal/min @ 1200 rpm, 31.5 gal/min @ 1800 rpm; Manufacturer Part No.:2520VQ21A5-1DD20; Cover End Pressure [Max:3000; Shaft End Pressure [Max:3000; GPM @ 1,800 rpm, Cover End:7.5; GPM @ 1,800 rpm, Shaft End:31.5; Integral Valve Configuration:w/o Integral Valves; Port Orientation - Cover End:Outlet 135° CW from Inlet; Port Orientation - Shaft End:Outlet 90° CW from Inlet; Pressure Port Size, Cover End:3/4 in Flange; Pressure Port Size, Shaft End:1 in Flange; Displacement Cover End (cu in/revolution):1.1; Displacement Shaft End (cu in/revolution):4.1;
DEUTZ  0 445 110 333 injectorPilot Type:45.0 LB; Shaft Length:Flange Mount; Weight:Right Hand (CW); Port Type:2520VQ21A5-1DD20; Port Orientation - Cover End:2.5; Minor Diameter [Max:Flange; Seal Material:3/16 in; Shaft End RPM [Max:Standard Pilot; Cover End RPM [Max:0.875 in; Controlled Flow Rate:Straight w/ Key; Pump Series:2520VQ; Shaft Length:1 15/16 in; Configuration:Double; Seal Material:Buna-N; Max. RPM [Max:2500; Minor Diameter:N/A; Mounting Flange:SAE B, 2 Bolt; Shaft Seal Type:Single Shaft Seal; Spline Description:N/A; Cover End RPM [Max:2700; Shaft End RPM [Max:2500; Controlled Flow Rate:N/A; Cover End Flow @ RPM:5 gal/min @ 1200 rpm, 7.5 gal/min @ 1800 rpm; Major Diameter [Max:N/A; Major Diameter [Min:N/A; Minor Diameter [Max:N/A; Minor Diameter [Min:N/A; Relief Valve Setting:N/A; Shaft End Flow @ RPM:21 gal/min @ 1200 rpm, 31.5 gal/min @ 1800 rpm; Manufacturer Part No.:2520VQ21A5-1DD20; Cover End Pressure [Max:3000; Shaft End Pressure [Max:3000; GPM @ 1,800 rpm, Cover End:7.5; GPM @ 1,800 rpm, Shaft End:31.5; Integral Valve Configuration:w/o Integral Valves; Port Orientation - Cover End:Outlet 135° CW from Inlet; Port Orientation - Shaft End:Outlet 90° CW from Inlet; Pressure Port Size, Cover End:3/4 in Flange; Pressure Port Size, Shaft End:1 in Flange; Displacement Cover End (cu in/revolution):1.1; Displacement Shaft End (cu in/revolution):4.1;
DEUTZ 0 445 110 334 injectorMounting Flange:45.0 LB; Port Size:Flange Mount; Relief Valve Setting:Right Hand (CW); Spline Description:2520VQ21A5-1DD20; GPM @ 1,800 rpm, Cover End:2.5; Shaft Key:Flange; Pressure Port Size, Cover End:3/16 in; Cover End Pressure [Max:Standard Pilot; Model No.:0.875 in; Pump Series:Straight w/ Key; Pump Series:2520VQ; Shaft Length:1 15/16 in; Configuration:Double; Seal Material:Buna-N; Max. RPM [Max:2500; Minor Diameter:N/A; Mounting Flange:SAE B, 2 Bolt; Shaft Seal Type:Single Shaft Seal; Spline Description:N/A; Cover End RPM [Max:2700; Shaft End RPM [Max:2500; Controlled Flow Rate:N/A; Cover End Flow @ RPM:5 gal/min @ 1200 rpm, 7.5 gal/min @ 1800 rpm; Major Diameter [Max:N/A; Major Diameter [Min:N/A; Minor Diameter [Max:N/A; Minor Diameter [Min:N/A; Relief Valve Setting:N/A; Shaft End Flow @ RPM:21 gal/min @ 1200 rpm, 31.5 gal/min @ 1800 rpm; Manufacturer Part No.:2520VQ21A5-1DD20; Cover End Pressure [Max:3000; Shaft End Pressure [Max:3000; GPM @ 1,800 rpm, Cover End:7.5; GPM @ 1,800 rpm, Shaft End:31.5; Integral Valve Configuration:w/o Integral Valves; Port Orientation - Cover End:Outlet 135° CW from Inlet; Port Orientation - Shaft End:Outlet 90° CW from Inlet; Pressure Port Size, Cover End:3/4 in Flange; Pressure Port Size, Shaft End:1 in Flange; Displacement Cover End (cu in/revolution):1.1; Displacement Shaft End (cu in/revolution):4.1;
DEUTZ  0 445 110 383 injectorPilot Type:45.0 LB; Minor Diameter [Min:Flange Mount; GPM @ 1,800 rpm, Shaft End:Right Hand (CW); Controlled Flow Rate:2520VQ21A5-1DD20; Displacement Shaft End (cu in/revolution):2.5; Rotation:Flange; Minor Diameter:3/16 in; Spline Description:Standard Pilot; Port Size:0.875 in; Shaft Dia.:Straight w/ Key; Pump Series:2520VQ; Shaft Length:1 15/16 in; Configuration:Double; Seal Material:Buna-N; Max. RPM [Max:2500; Minor Diameter:N/A; Mounting Flange:SAE B, 2 Bolt; Shaft Seal Type:Single Shaft Seal; Spline Description:N/A; Cover End RPM [Max:2700; Shaft End RPM [Max:2500; Controlled Flow Rate:N/A; Cover End Flow @ RPM:5 gal/min @ 1200 rpm, 7.5 gal/min @ 1800 rpm; Major Diameter [Max:N/A; Major Diameter [Min:N/A; Minor Diameter [Max:N/A; Minor Diameter [Min:N/A; Relief Valve Setting:N/A; Shaft End Flow @ RPM:21 gal/min @ 1200 rpm, 31.5 gal/min @ 1800 rpm; Manufacturer Part No.:2520VQ21A5-1DD20; Cover End Pressure [Max:3000; Shaft End Pressure [Max:3000; GPM @ 1,800 rpm, Cover End:7.5; GPM @ 1,800 rpm, Shaft End:31.5; Integral Valve Configuration:w/o Integral Valves; Port Orientation - Cover End:Outlet 135° CW from Inlet; Port Orientation - Shaft End:Outlet 90° CW from Inlet; Pressure Port Size, Cover End:3/4 in Flange; Pressure Port Size, Shaft End:1 in Flange; Displacement Cover End (cu in/revolution):1.1; Displacement Shaft End (cu in/revolution):4.1;
DEUTZ 0 445 120 142 injectorRotation:45.0 LB; Displacement Shaft End (cu in/revolution):Flange Mount; Minor Diameter [Min:Right Hand (CW); Shaft End Pressure [Max:2520VQ21A5-1DD20; Shaft Length:2.5; Relief Valve Setting:Flange; Max. RPM [Max:3/16 in; Major Diameter [Min:Standard Pilot; Port Type:0.875 in; Pressure Port Size, Shaft End:Straight w/ Key; Pump Series:2520VQ; Shaft Length:1 15/16 in; Configuration:Double; Seal Material:Buna-N; Max. RPM [Max:2500; Minor Diameter:N/A; Mounting Flange:SAE B, 2 Bolt; Shaft Seal Type:Single Shaft Seal; Spline Description:N/A; Cover End RPM [Max:2700; Shaft End RPM [Max:2500; Controlled Flow Rate:N/A; Cover End Flow @ RPM:5 gal/min @ 1200 rpm, 7.5 gal/min @ 1800 rpm; Major Diameter [Max:N/A; Major Diameter [Min:N/A; Minor Diameter [Max:N/A; Minor Diameter [Min:N/A; Relief Valve Setting:N/A; Shaft End Flow @ RPM:21 gal/min @ 1200 rpm, 31.5 gal/min @ 1800 rpm; Manufacturer Part No.:2520VQ21A5-1DD20; Cover End Pressure [Max:3000; Shaft End Pressure [Max:3000; GPM @ 1,800 rpm, Cover End:7.5; GPM @ 1,800 rpm, Shaft End:31.5; Integral Valve Configuration:w/o Integral Valves; Port Orientation - Cover End:Outlet 135° CW from Inlet; Port Orientation - Shaft End:Outlet 90° CW from Inlet; Pressure Port Size, Cover End:3/4 in Flange; Pressure Port Size, Shaft End:1 in Flange; Displacement Cover End (cu in/revolution):1.1; Displacement Shaft End (cu in/revolution):4.1;
DEUTZ 0 445 110 356 injectorRelief Valve Setting:45.0 LB; Rotation:Flange Mount; Shaft Length:Right Hand (CW); Shaft Dia.:2520VQ21A5-1DD20; Major Diameter [Min:2.5; Integral Valve Configuration:Flange; Shaft End RPM [Max:3/16 in; Shaft Seal Type:Standard Pilot; GPM @ 1,800 rpm, Cover End:0.875 in; Seal Material:Straight w/ Key; Pump Series:2520VQ; Shaft Length:1 15/16 in; Configuration:Double; Seal Material:Buna-N; Max. RPM [Max:2500; Minor Diameter:N/A; Mounting Flange:SAE B, 2 Bolt; Shaft Seal Type:Single Shaft Seal; Spline Description:N/A; Cover End RPM [Max:2700; Shaft End RPM [Max:2500; Controlled Flow Rate:N/A; Cover End Flow @ RPM:5 gal/min @ 1200 rpm, 7.5 gal/min @ 1800 rpm; Major Diameter [Max:N/A; Major Diameter [Min:N/A; Minor Diameter [Max:N/A; Minor Diameter [Min:N/A; Relief Valve Setting:N/A; Shaft End Flow @ RPM:21 gal/min @ 1200 rpm, 31.5 gal/min @ 1800 rpm; Manufacturer Part No.:2520VQ21A5-1DD20; Cover End Pressure [Max:3000; Shaft End Pressure [Max:3000; GPM @ 1,800 rpm, Cover End:7.5; GPM @ 1,800 rpm, Shaft End:31.5; Integral Valve Configuration:w/o Integral Valves; Port Orientation - Cover End:Outlet 135° CW from Inlet; Port Orientation - Shaft End:Outlet 90° CW from Inlet; Pressure Port Size, Cover End:3/4 in Flange; Pressure Port Size, Shaft End:1 in Flange; Displacement Cover End (cu in/revolution):1.1; Displacement Shaft End (cu in/revolution):4.1;
DEUTZ 0 445 110 362/363 injectorSpline Description:45.0 LB; Minor Diameter [Max:Flange Mount; Shaft Dia.:Right Hand (CW); Shaft Type:2520VQ21A5-1DD20; Minor Diameter:2.5; Cover End Flow @ RPM:Flange; Displacement Shaft End (cu in/revolution):3/16 in; Seal Material:Standard Pilot; Shaft End RPM [Max:0.875 in; Major Diameter [Min:Straight w/ Key; Pump Series:2520VQ; Shaft Length:1 15/16 in; Configuration:Double; Seal Material:Buna-N; Max. RPM [Max:2500; Minor Diameter:N/A; Mounting Flange:SAE B, 2 Bolt; Shaft Seal Type:Single Shaft Seal; Spline Description:N/A; Cover End RPM [Max:2700; Shaft End RPM [Max:2500; Controlled Flow Rate:N/A; Cover End Flow @ RPM:5 gal/min @ 1200 rpm, 7.5 gal/min @ 1800 rpm; Major Diameter [Max:N/A; Major Diameter [Min:N/A; Minor Diameter [Max:N/A; Minor Diameter [Min:N/A; Relief Valve Setting:N/A; Shaft End Flow @ RPM:21 gal/min @ 1200 rpm, 31.5 gal/min @ 1800 rpm; Manufacturer Part No.:2520VQ21A5-1DD20; Cover End Pressure [Max:3000; Shaft End Pressure [Max:3000; GPM @ 1,800 rpm, Cover End:7.5; GPM @ 1,800 rpm, Shaft End:31.5; Integral Valve Configuration:w/o Integral Valves; Port Orientation - Cover End:Outlet 135° CW from Inlet; Port Orientation - Shaft End:Outlet 90° CW from Inlet; Pressure Port Size, Cover End:3/4 in Flange; Pressure Port Size, Shaft End:1 in Flange; Displacement Cover End (cu in/revolution):1.1; Displacement Shaft End (cu in/revolution):4.1;
DEUTZ 0 445 110 335 injectorPressure Port Size, Shaft End:45.0 LB; Cover End Pressure [Max:Flange Mount; Minor Diameter [Max:Right Hand (CW); Integral Valve Configuration:2520VQ21A5-1DD20; Port Orientation - Cover End:2.5; Shaft End RPM [Max:Flange; Minor Diameter:3/16 in; Model No.:Standard Pilot; Pump Series:0.875 in; Shaft Length:Straight w/ Key; Pump Series:2520VQ; Shaft Length:1 15/16 in; Configuration:Double; Seal Material:Buna-N; Max. RPM [Max:2500; Minor Diameter:N/A; Mounting Flange:SAE B, 2 Bolt; Shaft Seal Type:Single Shaft Seal; Spline Description:N/A; Cover End RPM [Max:2700; Shaft End RPM [Max:2500; Controlled Flow Rate:N/A; Cover End Flow @ RPM:5 gal/min @ 1200 rpm, 7.5 gal/min @ 1800 rpm; Major Diameter [Max:N/A; Major Diameter [Min:N/A; Minor Diameter [Max:N/A; Minor Diameter [Min:N/A; Relief Valve Setting:N/A; Shaft End Flow @ RPM:21 gal/min @ 1200 rpm, 31.5 gal/min @ 1800 rpm; Manufacturer Part No.:2520VQ21A5-1DD20; Cover End Pressure [Max:3000; Shaft End Pressure [Max:3000; GPM @ 1,800 rpm, Cover End:7.5; GPM @ 1,800 rpm, Shaft End:31.5; Integral Valve Configuration:w/o Integral Valves; Port Orientation - Cover End:Outlet 135° CW from Inlet; Port Orientation - Shaft End:Outlet 90° CW from Inlet; Pressure Port Size, Cover End:3/4 in Flange; Pressure Port Size, Shaft End:1 in Flange; Displacement Cover End (cu in/revolution):1.1; Displacement Shaft End (cu in/revolution):4.1;

 

 

DEUTZ 0 445 110 171/181/182/189/190 injector Video

 

Contact Us

RMF Hydraulic Pump Co., Ltd.
Address9015 Winona Avenue, Schiller Park, lL 60176, U.S.A.
  • RMF Hydraulic Pump Co., Ltd.
    • 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

DEUTZ 0 445 110 171/181/182/189/190 Technical Articles

How do I know what size hydraulic pump I need?
Hydraulic Pump Volume Capacity - Engineering ToolBoxCalculate hydraulic pump volume capacity · 1 gpm (US) =6.30888x10-5 m3/s = 0.227 m3/h = 0.06309 dm3(litre)/s = 2.228x10-3 ft3/s = 0.1337 ft3/min = 0.8327 gpm  Hydraulic Pump...
What does it mean when a pump is cavitating?
Cavitation Definition | Intro to PumpsCavitation occurs at the inlet of a pump impeller when small bubbles rapidly and pump operators notice the sound of cavitation within a pump they should act  Understanding and avoiding pump cavitation | PI...
What is the most efficient hydraulic pump?
Maximizing Hydraulic Efficiency - Design EngineeringThis type of circuit offers one of the most efficient hydraulic circuits possible. In a typical closed loop circuit, there are two pumps: The main loop pump that  What hydraulic pump type is...

DEUTZ injector CATEGORIES

  • Rexroth PRESSURE RELIEF VALVE
  • Yuken Piston pump
  • Rexroth Vane pump
  • PAKER Piston Pump
  • Rexroth check valve
  • Yuken single Vane pump
  • Rexroth THROTTLE VALVE
  • Danfoss Shut-off valves
  • Yuken pressure valve
  • Rexroth Piston Pump
  • DENISON vane pump
  • Rexroth Solenoid directional valve
  • Yuken Double Vane pump
  • BOSCH injector
  • DEUTZ injector
  • COMMON RAIL injector
  • Eaton Vickers ydraulic Pump
  • For Komatsu
  • For Rexroth
  • Gear Pump
  • Hydraulic Motor
  • Kawasaki ydraulic Pump
  • Original Hydraulic Pump
  • Parker Denison ydraulic Pump
  • Piston Pump
  • Replacement for CAT
  • Sauer ydraulic Pump
  • Vane Pump
  • Water Pump
  • Yuken Hydraulic Pump
MORE

Customers Who Viewed DEUTZ 0 445 110 171/181/182/189/190 Also Viewed

  • DEUTZ 0 445 110 362/363 injector
  • DEUTZ 0 445 110 356 injector
  • DEUTZ 0 445 110 334 injector
  • DEUTZ 0 445 110 345 injector
  • DEUTZ  0 445 110 383 injector
 
  • About Us|
  • Contact Us|
  • Site Map
  • Sitemaps

RMF Hydraulic Pump Co., Ltd.. Copyright © 2017 - 2024 All Rights Reserved.

  • Home
  • Stock Categories
    • Rexroth PRESSURE RELIEF VALVE
    • Yuken Piston pump
    • Rexroth Vane pump
    • PAKER Piston Pump
    • Rexroth check valve
    • Yuken single Vane pump
    • Rexroth THROTTLE VALVE
    • Danfoss Shut-off valves
    • Yuken pressure valve
    • Rexroth Piston Pump
    • DENISON vane pump
    • Rexroth Solenoid directional valve
    • Yuken Double Vane pump
    • BOSCH injector
    • DEUTZ injector
    • COMMON RAIL injector
    • Eaton Vickers ydraulic Pump
    • For Komatsu
    • For Rexroth
    • Gear Pump
    • Hydraulic Motor
    • Kawasaki ydraulic Pump
    • Original Hydraulic Pump
    • Parker Denison ydraulic Pump
    • Piston Pump
    • Replacement for CAT
    • Sauer ydraulic Pump
    • Vane Pump
    • Water Pump
    • Yuken Hydraulic Pump
  • Technical Articles
  • Rexroth PRESSURE RELIEF VALVE
  • Yuken Piston pump
  • Rexroth Vane pump
✖

Home

Stock Categories

Technical Articles

Rexroth PRESSURE RELIEF VALVE

Yuken Piston pump

Rexroth Vane pump

Contact Us