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

FAQ Hydraulic Pump Co., Ltd.

DENISON vane pump   Yuken Double Vane pump   Rexroth PRESSURE RELIEF VALVE  
  • Home
  • Stock Categories
    • DENISON vane pump
    • Yuken Double Vane pump
    • Rexroth PRESSURE RELIEF VALVE
    • Rexroth THROTTLE VALVE
    • Danfoss Shut-off valves
    • Rexroth Piston Pump
    • Rexroth check valve
    • Yuken single Vane pump
    • Rexroth Solenoid directional valve
    • Rexroth Vane pump
    • Yuken pressure valve
    • Yuken Piston pump
    • PAKER Piston Pump
    • CAT injector
    • BOSCH injector
    • CUMMINS injector
    • COMMON RAIL injector
    • Denison Vane Pumps
    • High Pressure Vane Pump
    • Hydraulic Gear Pump
    • Hydraulic Piston Pump
    • Hydraulic Vane Motor
    • Hydraulic Vane Pump
    • Industrial Vane Pump
    • Tokimec Vane Pump
    • Vickers Vane Pump
    • Yuken Vane Pump
  • Technical Articles
  • DENISON vane pump
  • Yuken Double Vane pump
  • Rexroth PRESSURE RELIEF VALVE
✖

Home

Stock Categories

Technical Articles

DENISON vane pump

Yuken Double Vane pump

Rexroth PRESSURE RELIEF VALVE

Home>Products>Rexroth THROTTLE VALVE>Rexroth 2FRM10 THROTTLE VALVE

  • Rexroth 2FRM10 THROTTLE VALVE
  • Rexroth 2FRM10 THROTTLE VALVE
  • Rexroth 2FRM10 THROTTLE VALVE
  • Rexroth 2FRM10 THROTTLE VALVE

Rexroth 2FRM10 MODELS

Need a CAD or 3D Model?

Contact NowWhatsAppBe Our Agent

Rexroth 2FRM10 THROTTLE VALVE

category

Rexroth THROTTLE VALVE

Rexroth 2FRM10 SPECIFICATIONS

  • Shop Rexroth 2FRM10 THROTTLE VALVE FAQ Hydraulic Pump Co., Ltd. huge online discount Steel Cage Material Rexroth THROTTLE VALVE inventory. Rexroth THROTTLE VALVE and Import Deep Groove | Non-Fr Other Features machinery parts your car needs with Free Shipping and Free Extended Warranty.

  • Rexroth
  • 2FRM10

  • 75.0 LB
  • Flange Mount
  • Right Hand (CW)
  • 3520V25A12-1DD22R
  • 3
  • Flange
  • 5/16 in
  • Standard Pilot
FAQ Hydraulic Pump Co., Ltd.

FAQ Hydraulic Pump Co., Ltd.China

  • FAQ 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

Rexroth 2FRM10 THROTTLE VALVE Details

  • 1.25 in
  • Straight w/ Key
  • 3520V
  • 2.875 in
  • Buna-N
  • 1800
  • N/A
  • SAE C, 2 Bolt
  • Single Shaft Seal
  • N/A
  • 1800
  • 1800
  • N/A
  • 12 gal/min @ 1200 rpm, 18 gal/min @ 1800 rpm
  • N/A
  • N/A
  • N/A
  • N/A
  • N/A
  • 25 gal/min @ 1200 rpm, 37.5 gal/min @ 1800 rpm
  • 3520V25A12-1DD22R
  • 3000
  • 2500
  • 18
  • 37.5
  • N/A
  • Outlet 135° CW from Inlet
  • Outlet 90° CW from Inlet
  • 3/4 in Code 61
  • 1 1/4 in Code 61
  • 2.5
  • 4.9

Rexroth 2FRM10 Rexroth 2FRM10 THROTTLE VALVE Code description

Cross reference Rexroth 2FRM10 THROTTLE VALVE

No.BrandWeight
2FRM10-3X/10L R900424887REXROTH6
2FRM10-3X/10LRexroth6
R900349835 2FRM10-3X / 2LRexroth5.6

 

Rexroth M-2SEW6N3X/630MG24N9K4 THROTTLE VALVECover End RPM [Max:75.0 LB; GPM @ 1,800 rpm, Shaft End:Flange Mount; Model No.:Right Hand (CW); Rotation:3520V25A12-1DD22R; Mounting:3; Port Orientation - Cover End:Flange; Port Orientation - Shaft End:5/16 in; Relief Valve Setting:Standard Pilot; Shaft Key:1.25 in; Pilot Type:Straight w/ Key; Pump Series:3520V; Shaft Length:2.875 in; Seal Material:Buna-N; Max. RPM [Max:1800; Minor Diameter:N/A; Mounting Flange:SAE C, 2 Bolt; Shaft Seal Type:Single Shaft Seal; Spline Description:N/A; Cover End RPM [Max:1800; Shaft End RPM [Max:1800; Controlled Flow Rate:N/A; Cover End Flow @ RPM:12 gal/min @ 1200 rpm, 18 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:25 gal/min @ 1200 rpm, 37.5 gal/min @ 1800 rpm; Manufacturer Part No.:3520V25A12-1DD22R; Cover End Pressure [Max:3000; Shaft End Pressure [Max:2500; GPM @ 1,800 rpm, Cover End:18; GPM @ 1,800 rpm, Shaft End:37.5; Integral Valve Configuration:N/A; 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 Code 61; Pressure Port Size, Shaft End:1 1/4 in Code 61; Displacement Cover End (cu in/revolution):2.5; Displacement Shaft End (cu in/revolution):4.9;
Rexroth M-2SEW6N3X/420MG205N9K4 THROTTLE VALVEModel No.:75.0 LB; Shaft End Flow @ RPM:Flange Mount; Port Orientation - Shaft End:Right Hand (CW); Minor Diameter [Max:3520V25A12-1DD22R; Weight:3; Integral Valve Configuration:Flange; Mounting Flange:5/16 in; Shaft End RPM [Max:Standard Pilot; Major Diameter [Min:1.25 in; GPM @ 1,800 rpm, Cover End:Straight w/ Key; Pump Series:3520V; Shaft Length:2.875 in; Seal Material:Buna-N; Max. RPM [Max:1800; Minor Diameter:N/A; Mounting Flange:SAE C, 2 Bolt; Shaft Seal Type:Single Shaft Seal; Spline Description:N/A; Cover End RPM [Max:1800; Shaft End RPM [Max:1800; Controlled Flow Rate:N/A; Cover End Flow @ RPM:12 gal/min @ 1200 rpm, 18 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:25 gal/min @ 1200 rpm, 37.5 gal/min @ 1800 rpm; Manufacturer Part No.:3520V25A12-1DD22R; Cover End Pressure [Max:3000; Shaft End Pressure [Max:2500; GPM @ 1,800 rpm, Cover End:18; GPM @ 1,800 rpm, Shaft End:37.5; Integral Valve Configuration:N/A; 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 Code 61; Pressure Port Size, Shaft End:1 1/4 in Code 61; Displacement Cover End (cu in/revolution):2.5; Displacement Shaft End (cu in/revolution):4.9;
Rexroth M-2SEW6N3X/420MG24N9K4 THROTTLE VALVEShaft End RPM [Max:75.0 LB; Mounting:Flange Mount; Controlled Flow Rate:Right Hand (CW); Pilot Type:3520V25A12-1DD22R; Shaft End Pressure [Max:3; Cover End Pressure [Max:Flange; Seal Material:5/16 in; Shaft Key:Standard Pilot; Max. RPM [Max:1.25 in; Spline Description:Straight w/ Key; Pump Series:3520V; Shaft Length:2.875 in; Seal Material:Buna-N; Max. RPM [Max:1800; Minor Diameter:N/A; Mounting Flange:SAE C, 2 Bolt; Shaft Seal Type:Single Shaft Seal; Spline Description:N/A; Cover End RPM [Max:1800; Shaft End RPM [Max:1800; Controlled Flow Rate:N/A; Cover End Flow @ RPM:12 gal/min @ 1200 rpm, 18 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:25 gal/min @ 1200 rpm, 37.5 gal/min @ 1800 rpm; Manufacturer Part No.:3520V25A12-1DD22R; Cover End Pressure [Max:3000; Shaft End Pressure [Max:2500; GPM @ 1,800 rpm, Cover End:18; GPM @ 1,800 rpm, Shaft End:37.5; Integral Valve Configuration:N/A; 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 Code 61; Pressure Port Size, Shaft End:1 1/4 in Code 61; Displacement Cover End (cu in/revolution):2.5; Displacement Shaft End (cu in/revolution):4.9;
Rexroth M-2SEW6N3X/630MG205N9K4 THROTTLE VALVEShaft Type:75.0 LB; Minor Diameter [Max:Flange Mount; Pump Series:Right Hand (CW); Seal Material:3520V25A12-1DD22R; Max. RPM [Max:3; Pilot Type:Flange; Shaft Dia.:5/16 in; Shaft End Pressure [Max:Standard Pilot; Shaft Key:1.25 in; Major Diameter [Max:Straight w/ Key; Pump Series:3520V; Shaft Length:2.875 in; Seal Material:Buna-N; Max. RPM [Max:1800; Minor Diameter:N/A; Mounting Flange:SAE C, 2 Bolt; Shaft Seal Type:Single Shaft Seal; Spline Description:N/A; Cover End RPM [Max:1800; Shaft End RPM [Max:1800; Controlled Flow Rate:N/A; Cover End Flow @ RPM:12 gal/min @ 1200 rpm, 18 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:25 gal/min @ 1200 rpm, 37.5 gal/min @ 1800 rpm; Manufacturer Part No.:3520V25A12-1DD22R; Cover End Pressure [Max:3000; Shaft End Pressure [Max:2500; GPM @ 1,800 rpm, Cover End:18; GPM @ 1,800 rpm, Shaft End:37.5; Integral Valve Configuration:N/A; 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 Code 61; Pressure Port Size, Shaft End:1 1/4 in Code 61; Displacement Cover End (cu in/revolution):2.5; Displacement Shaft End (cu in/revolution):4.9;
Rexroth M-2SEW6P3X/630MG205N9K4 THROTTLE VALVEPressure Port Size, Cover End:75.0 LB; Max. RPM [Max:Flange Mount; Cover End Pressure [Max:Right Hand (CW); Shaft Key:3520V25A12-1DD22R; Weight:3; Port Orientation - Cover End:Flange; Shaft End Flow @ RPM:5/16 in; Manufacturer Part No.:Standard Pilot; Major Diameter [Min:1.25 in; Pilot Type:Straight w/ Key; Pump Series:3520V; Shaft Length:2.875 in; Seal Material:Buna-N; Max. RPM [Max:1800; Minor Diameter:N/A; Mounting Flange:SAE C, 2 Bolt; Shaft Seal Type:Single Shaft Seal; Spline Description:N/A; Cover End RPM [Max:1800; Shaft End RPM [Max:1800; Controlled Flow Rate:N/A; Cover End Flow @ RPM:12 gal/min @ 1200 rpm, 18 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:25 gal/min @ 1200 rpm, 37.5 gal/min @ 1800 rpm; Manufacturer Part No.:3520V25A12-1DD22R; Cover End Pressure [Max:3000; Shaft End Pressure [Max:2500; GPM @ 1,800 rpm, Cover End:18; GPM @ 1,800 rpm, Shaft End:37.5; Integral Valve Configuration:N/A; 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 Code 61; Pressure Port Size, Shaft End:1 1/4 in Code 61; Displacement Cover End (cu in/revolution):2.5; Displacement Shaft End (cu in/revolution):4.9;
Rexroth M-2SEW6P3X/420MG205N9K4 THROTTLE VALVEWeight:75.0 LB; Port Orientation - Shaft End:Flange Mount; Port Orientation - Cover End:Right Hand (CW); Pump Series:3520V25A12-1DD22R; Pressure Port Size, Shaft End:3; Port Type:Flange; Shaft Type:5/16 in; Displacement Shaft End (cu in/revolution):Standard Pilot; Pilot Type:1.25 in; Relief Valve Setting:Straight w/ Key; Pump Series:3520V; Shaft Length:2.875 in; Seal Material:Buna-N; Max. RPM [Max:1800; Minor Diameter:N/A; Mounting Flange:SAE C, 2 Bolt; Shaft Seal Type:Single Shaft Seal; Spline Description:N/A; Cover End RPM [Max:1800; Shaft End RPM [Max:1800; Controlled Flow Rate:N/A; Cover End Flow @ RPM:12 gal/min @ 1200 rpm, 18 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:25 gal/min @ 1200 rpm, 37.5 gal/min @ 1800 rpm; Manufacturer Part No.:3520V25A12-1DD22R; Cover End Pressure [Max:3000; Shaft End Pressure [Max:2500; GPM @ 1,800 rpm, Cover End:18; GPM @ 1,800 rpm, Shaft End:37.5; Integral Valve Configuration:N/A; 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 Code 61; Pressure Port Size, Shaft End:1 1/4 in Code 61; Displacement Cover End (cu in/revolution):2.5; Displacement Shaft End (cu in/revolution):4.9;
Rexroth M-2SEW6P3X/630MG24N9K4 THROTTLE VALVEPort Orientation - Shaft End:75.0 LB; Minor Diameter [Min:Flange Mount; Max. RPM [Max:Right Hand (CW); Minor Diameter [Max:3520V25A12-1DD22R; Model No.:3; Mounting:Flange; Cover End Flow @ RPM:5/16 in; Major Diameter [Min:Standard Pilot; Displacement Cover End (cu in/revolution):1.25 in; Cover End RPM [Max:Straight w/ Key; Pump Series:3520V; Shaft Length:2.875 in; Seal Material:Buna-N; Max. RPM [Max:1800; Minor Diameter:N/A; Mounting Flange:SAE C, 2 Bolt; Shaft Seal Type:Single Shaft Seal; Spline Description:N/A; Cover End RPM [Max:1800; Shaft End RPM [Max:1800; Controlled Flow Rate:N/A; Cover End Flow @ RPM:12 gal/min @ 1200 rpm, 18 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:25 gal/min @ 1200 rpm, 37.5 gal/min @ 1800 rpm; Manufacturer Part No.:3520V25A12-1DD22R; Cover End Pressure [Max:3000; Shaft End Pressure [Max:2500; GPM @ 1,800 rpm, Cover End:18; GPM @ 1,800 rpm, Shaft End:37.5; Integral Valve Configuration:N/A; 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 Code 61; Pressure Port Size, Shaft End:1 1/4 in Code 61; Displacement Cover End (cu in/revolution):2.5; Displacement Shaft End (cu in/revolution):4.9;
Rexroth M-2SEW6P3X/420MG24N9K4 THROTTLE VALVEMounting Flange:75.0 LB; Seal Material:Flange Mount; Shaft Type:Right Hand (CW); Pilot Type:3520V25A12-1DD22R; Shaft End RPM [Max:3; Shaft End Flow @ RPM:Flange; Shaft End Pressure [Max:5/16 in; Major Diameter [Min:Standard Pilot; Port Orientation - Cover End:1.25 in; Pressure Port Size, Cover End:Straight w/ Key; Pump Series:3520V; Shaft Length:2.875 in; Seal Material:Buna-N; Max. RPM [Max:1800; Minor Diameter:N/A; Mounting Flange:SAE C, 2 Bolt; Shaft Seal Type:Single Shaft Seal; Spline Description:N/A; Cover End RPM [Max:1800; Shaft End RPM [Max:1800; Controlled Flow Rate:N/A; Cover End Flow @ RPM:12 gal/min @ 1200 rpm, 18 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:25 gal/min @ 1200 rpm, 37.5 gal/min @ 1800 rpm; Manufacturer Part No.:3520V25A12-1DD22R; Cover End Pressure [Max:3000; Shaft End Pressure [Max:2500; GPM @ 1,800 rpm, Cover End:18; GPM @ 1,800 rpm, Shaft End:37.5; Integral Valve Configuration:N/A; 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 Code 61; Pressure Port Size, Shaft End:1 1/4 in Code 61; Displacement Cover End (cu in/revolution):2.5; Displacement Shaft End (cu in/revolution):4.9;

 

Throttle valve | Bosch Rexroth Japan

Throttle valve. FG. Size 16 … 32; Component series 2X; Maximum operating pressure 315 bar; Maximum flow 400 l/min. Order 

Throttle valve | Bosch Rexroth Australia

Throttle valve. FG. Size 16 … 32; Component series 2X; Maximum operating pressure 315 bar; Maximum flow 400 l/min. Order 

Throttle valve | Bosch Rexroth USA

Throttle valve. Z1FG. Size 6; Component series 4X; Maximum operating pressure 4550 psi; Maximum flow 18.5 gpm. Order 

Throttle valve | Bosch Rexroth USA

Throttle valve. FG. Size 16 … 32; Component series 2X; Maximum operating pressure 4550 psi; Maximum flow 106 gpm. Order 

Throttle valves | Bosch Rexroth AG

Throttle valve · FG. Size 16 … 32; Component series 2X; Maximum operating pressure 315 bar; Maximum flow 400 l/min. Data sheet · Spare parts and repair 

 

Rexroth 2FRM10 THROTTLE VALVE Video

 

Contact Us

FAQ Hydraulic Pump Co., Ltd.
AddressAl. Stanow Zjednoczonych 63A 04-028 Warsaw, Poland
  • FAQ 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

Rexroth 2FRM10 Technical Articles

How do you get air out of hydraulic system?
How To Deal With Air In Hydraulic Oil | Hydraulics & PneumaticsFree air - such as a pocket of air trapped in part of a system. As pointed out above, hydraulic oil can contain up to 12 percent dissolved air by volume. Certain  How to Bleed a...
What are 3 types of hydraulic pumps?
Types of Hydraulic Pumps - How to Repair Hydraulic pumpWhat Are the Different Types of Hydraulic Pumps? There are three main types of hydraulic pumps that you will encounter — piston pumps, vane pumps and gear  Engineering Essentials:...
What the difference between a hydraulic pump and motor?
What Is The Difference Between A Hydraulic Pump And AMar 23, 2020 — (1) In principle, the hydraulic motor and hydraulic pump are reversible. If driven Differences between hydraulic motors and hydraulic pumps: Fundamentals of Hydraulic Motors |...

Rexroth THROTTLE VALVE CATEGORIES

  • DENISON vane pump
  • Yuken Double Vane pump
  • Rexroth PRESSURE RELIEF VALVE
  • Rexroth THROTTLE VALVE
  • Danfoss Shut-off valves
  • Rexroth Piston Pump
  • Rexroth check valve
  • Yuken single Vane pump
  • Rexroth Solenoid directional valve
  • Rexroth Vane pump
  • Yuken pressure valve
  • Yuken Piston pump
  • PAKER Piston Pump
  • CAT injector
  • BOSCH injector
  • CUMMINS injector
  • COMMON RAIL injector
  • Denison Vane Pumps
  • High Pressure Vane Pump
  • Hydraulic Gear Pump
  • Hydraulic Piston Pump
  • Hydraulic Vane Motor
  • Hydraulic Vane Pump
  • Industrial Vane Pump
  • Tokimec Vane Pump
  • Vickers Vane Pump
  • Yuken Vane Pump
MORE

Customers Who Viewed Rexroth 2FRM10 Also Viewed

  • Rexroth M-2SEW......./V THROTTLE VALVE
  • Rexroth M-3SED....../V THROTTLE VALVE
  • Rexroth M-3SEW......../V THROTTLE VALVE
  • Rexroth M-2SEW6P3X/630MG205N9K4 THROTTLE VALVE
  • Rexroth M-2SEW6N3X/630MG205N9K4 THROTTLE VALVE
 
  • About Us|
  • Contact Us|
  • Site Map
  • Sitemaps

FAQ Hydraulic Pump Co., Ltd.. Copyright © 2017 - 2023 All Rights Reserved.

  • Home
  • Stock Categories
    • DENISON vane pump
    • Yuken Double Vane pump
    • Rexroth PRESSURE RELIEF VALVE
    • Rexroth THROTTLE VALVE
    • Danfoss Shut-off valves
    • Rexroth Piston Pump
    • Rexroth check valve
    • Yuken single Vane pump
    • Rexroth Solenoid directional valve
    • Rexroth Vane pump
    • Yuken pressure valve
    • Yuken Piston pump
    • PAKER Piston Pump
    • CAT injector
    • BOSCH injector
    • CUMMINS injector
    • COMMON RAIL injector
    • Denison Vane Pumps
    • High Pressure Vane Pump
    • Hydraulic Gear Pump
    • Hydraulic Piston Pump
    • Hydraulic Vane Motor
    • Hydraulic Vane Pump
    • Industrial Vane Pump
    • Tokimec Vane Pump
    • Vickers Vane Pump
    • Yuken Vane Pump
  • Technical Articles
  • DENISON vane pump
  • Yuken Double Vane pump
  • Rexroth PRESSURE RELIEF VALVE
✖

Home

Stock Categories

Technical Articles

DENISON vane pump

Yuken Double Vane pump

Rexroth PRESSURE RELIEF VALVE

Contact Us