LINDE HPR HYDRAULIC PUMP SUPPLIER
LINDE HPR HYDRAULIC PUMP SUPPLIER
Linde HPR Hydraulic Pump   Kawasaki K5V Hydraulic Pump   Kawasaki K3VL Axial Piston Pump  
English
English
  • Home
  • Stock Categories
    • Linde HPR Hydraulic Pump
    • Kawasaki K5V Hydraulic Pump
    • Kawasaki K3VL Axial Piston Pump
    • Kawasaki K3VG Variable Displacement Axial Piston Pump
    • Kawasaki K3V Hydraulic Pump
    • Bosch Rexroth A8VO Variable Displacement Pumps
    • Bosch Rexroth A4VSG Axial Piston Variable Pump
    • Bosch Rexroth A7VO Variable Displacement Pumps
    • Bosch Rexroth A4VTG Axial Piston Variable Pump
    • Bosch Rexroth A4VSO Variable Displacement Pumps
    • Bosch Rexroth A4VG Variable Displacement Pumps
    • Bosch Rexroth A4V Variable Pumps
    • Bosch Rexroth A10VG Axial Piston Variable Pump
    • Bosch Rexroth A10VO Piston Pumps
    • Bosch Rexroth A10VSO Variable Displacement Pumps
    • Bosch Rexroth A11VG Hydraulic Pumps
    • Bosch Rexroth A11VLO Axial Piston Variable Pump
    • Bosch Rexroth A11VO Axial Piston Pump
    • Bosch Rexroth A15VSO Axial Piston Pump
    • Bosch Rexroth A2FO Fixed Displacement Pumps
    • Bosch Rexroth A10VNO Axial Piston Pumps
    • Bosch Rexroth A2V Variable Displacement Pumps
  • Technical Articles
  • Linde HPR Hydraulic Pump
  • Kawasaki K5V Hydraulic Pump
  • Kawasaki K3VL Axial Piston Pump
✖

Home

Stock Categories

Technical Articles

Linde HPR Hydraulic Pump

Kawasaki K5V Hydraulic Pump

Kawasaki K3VL Axial Piston Pump

Home>Products>Bosch Rexroth A10VNO Axial Piston Pumps>A A10VNO 45 DRG/52L-VRC40N BOSCH REXROTH A10VNO Axial Piston Pumps

  • A A10VNO 45 DRG/52L-VRC40N BOSCH REXROTH A10VNO Axial Piston Pumps
  • A A10VNO 45 DRG/52L-VRC40N BOSCH REXROTH A10VNO Axial Piston Pumps

BOSCH REXROTH A A10VNO 45 DRG/52L-VRC40N MODELS

Need a CAD or 3D Model?

What is A A10VNO 45 DRG/52L-VRC40N bearing cross reference？
Contact NowWhatsAppBe Our Agent

A A10VNO 45 DRG/52L-VRC40N BOSCH REXROTH A10VNO Axial Piston Pumps

category

Bosch Rexroth A10VNO Axial Piston Pumps

BOSCH REXROTH A A10VNO 45 DRG/52L-VRC40N Bearing SPECIFICATIONS

  • QuestionA A10VNO 45 DRG/52L-VRC40N BOSCH REXROTH A10VNO Axial Piston Pumps ? 1.00 mm Fillet Radius rb Find what you need 170.000 mm d faster by entering your Bosch Rexroth A10VNO Axial Piston Pumps information .

  • BOSCH REXROTH

  • A A10VNO 45 DRG/52L-VRC40N

  • 170.000 mm
  • 3.00 mm
  • 1.00 mm
  • 1900 rpm
  • 1040000 N
  • 360.0000 mm
  • 144.00 mm
  • 1500 rpm
LINDE HPR HYDRAULIC PUMP SUPPLIER

LINDE HPR HYDRAULIC PUMP SUPPLIERChina

  • LINDE HPR 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

Bosch Rexroth A10VNO Axial Piston Pumps Cross References

  • 170.000 mm
  • 3.00 mm
  • 1.00 mm
  • 1900 rpm
  • 1040000 N
  • 360.0000 mm
  • 144.00 mm
  • 1500 rpm
  • 650000 N

BOSCH REXROTH A A10VNO 45 DRG/52L-VRC40N A A10VNO 45 DRG/52L-VRC40N BOSCH REXROTH A10VNO Axial Piston Pumps Dimensions

 

AL A10VNO 41ED 73/52R-VSC73N00P -S2538 BOSCH REXROTH A10VNO Axial Piston Pumpsrb max.:0.6 mm; D1:82.22 mm; da min.:66 mm; C1:6.3 mm; Mass bearing:0.39 kg; B:18 mm; Calculation factor fHC:1.01; Calculation factor (single, tandem) Y0:0.38; Calculation factor f2A:1; Preload class C GC:870 N; Db max.:90.8 mm; Static axial stiffness, preload class A:135 N/µm; Calculation factor e:0.68; r3,4 min.:0.6 mm; d:60 mm; ra max.:1 mm; Ball diameter Dw:7.938 mm; Calculation factor (single, tandem) Y2:0.87;
A A10C O 45 DFR1/52L-VUC12H003G BOSCH REXROTH A10CO Piston PumpBasic dynamic load rating C:0.143 kN; d1 ≈:4.8 mm; Calculation factor kr:0.015; Reference speed:150000 r/min; Basic static load rating C0:0.053 kN; D:7 mm; r1,2 min.:0.1 mm; Fatigue load limit Pu:0.002 kN; Mass bearing:0.00031 kg; Da max.:6.4 mm; D2 ≈:6.3 mm; ra max.:0.1 mm; Limiting speed:75000 r/min; B:2.5 mm; Calculation factor f0:7.6; da min.:4.6 mm; d:4 mm; da max.:4.7 mm;
AL A10CNO85 DRS/53L-VRDXXH143D-S316 BOSCH REXROTH A10CNO Piston PumpN1:28.575 mm; R1:101.6 mm; S:4.763 mm; da:125.412 mm; J max.:434.975 mm; Initial grease fill:850.5 g; End plug (suffix Y):EPR 27; L:511.175 mm; Mass pillow block:90.3 kg; H1:152.4 mm; H2:60.325 mm; Cap bolt recommended tightening torque:515.2 N·m; RG:3/8 NPT; P180°:81.4 kN; Da:250 mm; Cap bolt, SAE grade:8; J1:85.725 mm; A1:149.225 mm; A2:231.775 mm; P120°:73.8 kN;
AL A10VNO 28 DRS/53R-VRC11N00-S302 BOSCH REXROTH A10VNO Axial Piston PumpsG1:26 mm; Da max.:380 mm; ra max.:4 mm; B1:160 mm; Limiting speed:1600 r/min; Mass bearing + sleeve:87.5 kg; d1:180 mm; da min.:201 mm; D:400 mm; Basic dynamic load rating C:2232 kN; Calculation factor Y2:2.9; B:132 mm; K:12 mm; Calculation factor Y1:1.9; Calculation factor Y0:1.8; Fatigue load limit Pu:208 kN; Calculation factor e:0.35; b:22.3 mm; G:M 200x3; r1,2 min.:5 mm;
AL A10VNO 85 DRF/53L-VWC11N00-S1856 BOSCH REXROTH A10VNO Axial Piston PumpsBasic Static Radial Load Rating Co:81500 N; Fillet Radius ra:2.00 mm; B:52.40 mm; d:55.000 mm; Accessories:One Seal; Oil Speed Rating n2:5000 rpm; Basic Dynamic Radial Load Rating C:106000 N; D:120.0000 mm; Sealed Speed Rating n3:3800 rpm; Grease Speed Rating n1:3800 rpm;
AL A10VNO 45 DR/52L-VRC12K01-SO275 BOSCH REXROTH A10VNO Axial Piston Pumpsh:2 mm; B3:3 mm; d1:41.5 mm; Mass lock nut:0.091 kg; B:11.5 mm; Recommended grub screw tightening torque:4.5 N·m; G:M 35x1.5; d3:52 mm; b:5 mm; Axial static load carrying capacity:50 kN; Grub (set) screw size:M5; Associated spanner:HN 7;
AL A10CNO63 DFR/52R-VWC12H902D-S2434 BOSCH REXROTH A10CNO Piston PumpB:39.70 mm; Sealed Speed Rating n3:4500 rpm; Basic Static Radial Load Rating Co:80000 N; Oil Speed Rating n2:6000 rpm; Basic Dynamic Radial Load Rating C:80900 N; Fillet Radius ra:1.50 mm; Accessories:One Shield; Grease Speed Rating n1:4500 rpm; d:45.000 mm; D:100.0000 mm;
A A10VNO 28 DRS/52R-VRC40N00-S229 BOSCH REXROTH A10VNO Axial Piston Pumpsr3,4 min.:1 mm; Calculation factor f2A:1; Basic static load rating C0:45 kN; Basic dynamic load rating C:47.5 kN; Static axial stiffness, preload class C:204 N/µm; dn:135.4 mm; Preload class C GC:1520 N; ra max.:2 mm; D1:147.61 mm; da min.:118.8 mm; Static axial stiffness, preload class B:149 N/µm; C1:15.1 mm; Db max.:164.4 mm; rb max.:1 mm; Reference grease quantity Gref:23 cm³; db min.:118.8 mm;
AL A10C O 45 DFR1/52R-VUC07H002D -S1222 BOSCH REXROTH A10CO Piston PumpCoefficient of friction µ min.:0.05; Permissible sliding velocity v min.:0.25 m/s; B1:5 mm; d:45 mm; Tolerance shaft:h8; Coefficient of friction µ max.:0.1; Mass bushing:0.2 kg; B:35 mm; Specific static load factor K0:20 N/mm²; D1:65 mm; D:55 mm; Tolerance housing:H7; Specific dynamic load factor K:10 N/mm²; Permissible sliding velocity v max.:5 m/s;
A A10VNO 63 DRS/52R-VWC12N00-S2521 BOSCH REXROTH A10VNO Axial Piston Pumpsra max.:4 mm; Mass bearing:131 kg; d1 ≈:911 mm; Fatigue load limit Pu:375 kN; D1 ≈:972 mm; r1,2 min.:5 mm; Calculation factor e:0.2; B:82 mm; s max.:9 mm; Limiting speed:260 r/min; Da max.:1012 mm; D:1030 mm; das:903 mm; da min.:868 mm; Reference speed:200 r/min; Db max.:1012 mm; Basic static load rating C0:5200 kN; E:986 mm; d:850 mm; Basic dynamic load rating C:2050 kN;
A A10VNO 45 ED72/52L-VRC13K52P -S2946 BOSCH REXROTH A10VNO Axial Piston Pumpsr3,4 min.:2.1 mm; B:39 mm; D1 ≈:142.7 mm; d1 ≈:110 mm; Calculation factor kr:0.15; Limiting value e:0.2; Mass bearing:4.65 kg; ra max.:2 mm; Basic dynamic load rating C:300 kN; Axial load factor Y:0.6; r1,2 min.:2.1 mm; Basic static load rating C0:290 kN; Limiting speed:5000 r/min; Da max.:157.8 mm; da min.:92 mm; Fatigue load limit Pu:36 kN; d:80 mm; D:170 mm; Reference speed:4300 r/min;
A10VNO45DFR1-52L-VCC07K01 BOSCH REXROTH A10VNO Axial Piston PumpsBasic Dynamic Radial Load Rating C:147000 N; Basic Static Radial Load Rating Co:140000 N; Oil Speed Rating Open/Shielded n2:3900 rpm; Grease Speed Rating Open/Shielded n1:3200 rpm; D:180.0000 mm; d:70.000 mm; Fillet Radius ra:2.50 mm; B:42.00 mm; Accessories:Without Accessories;
AL A10VNO 85 DRF/53L-VWC11N00-S1856 BOSCH REXROTH A10VNO Axial Piston PumpsBasic Static Radial Load Rating Co:255000 N; d:100.000 mm; Fillet Radius ra:2.50 mm; Oil Speed Rating n2:2600 rpm; B:82.60 mm; Basic Dynamic Radial Load Rating C:255000 N; Grease Speed Rating n1:1800 rpm; D:215.0000 mm; Accessories:No Shield, no Seal,; Sealed Speed Rating n3:1800 rpm;
AL A10VNO 45ED 72/52R-VSC12N00H -SO607 BOSCH REXROTH A10VNO Axial Piston PumpsGrease Speed Rating Open/Shielded n1:6300 rpm; Basic Static Radial Load Rating Co:29000 N; d:55.000 mm; Fillet Radius ra:1.50 mm; D:100.0000 mm; Sealed Speed Rating n3:4300 rpm; Accessories:Removable Metal Shie; Basic Dynamic Radial Load Rating C:39700 N; Oil Speed Rating Open/Shielded n2:7500 rpm; B:33.34 mm;
AL A10CNO63 DFR/52R-VWC12H90'981094*EW*& BOSCH REXROTH A10CNO Piston PumpCalculation factor Y2:3; d:180 mm; Mass bearing:38 kg; Basic static load rating C0:2120 kN; K:7.5 mm; Fatigue load limit Pu:190 kN; Calculation factor e:0.33; Limiting speed:360 r/min; d2 ≈:205 mm; Da max.:303 mm; da min.:197 mm; da max.:205 mm; Calculation factor Y0:2; Calculation factor Y1:2; ra max.:3 mm; r1,2 min.:4 mm; b:13.9 mm; B:112 mm; D1 ≈:285 mm; D:320 mm;
A A10CNO 63 DFR1/52R-VWC12H602D-S4276 BOSCH REXROTH A10CNO Piston Pumpd:130.000 mm; Fillet Radius rb:1.00 mm; Fillet Radius ra:2.00 mm; Basic Dynamic Radial Load Rating C:225000 N; D:200.0000 mm; B:66.00 mm; Oil Speed Rating n2:8800 rpm; Grease Speed Rating n1:5900 rpm; Basic Static Radial Load Rating Co:300000 N;

 

 

No.BrandTwLsfBAC
A A10VNO 63 DRS/52R-VRC11N00-S1518BOSCH REXROTH - - - - - 25 mm - -
AL A10CNO 63 DFR1/52R-VWC12H902D-S4279BOSCH REXROTH - - - - - 90.00 mm - -
G A10VNO 85 DR/54L-VWC11N00 -S1676BOSCH REXROTH - - - - - 156.00 mm - -
A10VNO85DRS-53R-VWC11NBOSCH REXROTH - - 244.475 mm - - - - -
AL A10VNO 28ED 72/53R-VSC11N00PBOSCH REXROTH - - - - - 70 mm - -
A A10CNO 45 DFR1/52R-VSC07H503D-S1958BOSCH REXROTH - - - - - 500 mm - 500 mm
AL A10VNO 45ED 72/52R-VRC11N00PBOSCH REXROTH - - - - - 106 mm8 mm -
A10VNO63DFR1-52L-VRC11NBOSCH REXROTH - - - - - 31.00 mm - -
A10VNO45DFR1-52R-HRC40NBOSCH REXROTH - - - - - - - -
A10VNO41DFR1-52L-HRC40NBOSCH REXROTH - - 628.65 mm - - - - -
AL A10VNO 45ED 74/52R-VSC12N00P -S3247BOSCH REXROTH28 mm - - - - 28 mm - -
AL A10VNO 28 DRF/53L-VSC11N00-S3767BOSCH REXROTH - - - - - 44 mm - -
AL A10CNO 45 DFR1/52L-VTC07H603D-S1596BOSCH REXROTH701.675 mm - - - - 701.675 mm - -
A A10CNO 45 DR/53L-VSC62H602D -S5047BOSCH REXROTH - - - - - 8 mm - -
A A10CNO 63 DFR1/52R-VWC12H602D-S233BOSCH REXROTH - - - - - 165 mm - -
AL A10C O 45 DFR1/52R-VUC07H002D-SO968BOSCH REXROTH457.2 mm - - - - 455.612 mm - -
A A10VNO 28 DRS/53L-VTC09N00-S2673BOSCH REXROTH - - - - - 36.50 mm - -
A10CO45DFR1-52R-VWC12H502DBOSCH REXROTH - - - - - - - -
AL A10C O 63 DRSC/53R-VWC07H505G -S4894BOSCH REXROTH - - 209.55 mm - - - - -
AL A10VNO 45 DFR/52R-VRC07N00-S1341BOSCH REXROTH - - - - - 69 mm - -
AL A10VNO 85 DRS/53L-VWC11N00 -S1346BOSCH REXROTH - - - - - 40.00 mm - -
A A10VNO 63 DFR5/52R-VSC11N00-S174BOSCH REXROTH40 mm - - - - 39 mm - 33 mm
AL A10CNO63 DFR/52R-VWC12H90'981094*EW*&BOSCH REXROTH - - - - - 112 mm - -
AL A10VNO 45 DFR1/52R-HRC40N00-S1005BOSCH REXROTH - - - - - - - -

 

A A10VNO 45 DRG/52L-VRC40N BOSCH REXROTH A10VNO Axial Piston Pumps Video

 

Axial piston variable pump - A10VNO - Bosch Rexroth

Axial piston variable pump. A10VNO series 5x. For low pressure applications such as in tractors or for fan drives; Size 28 … 85; Nominal pressure 3050 psi ...

Axial piston variable pump | Bosch Rexroth AG

Axial piston variable pump. A10VO series 32. Optimized medium pressure pump for high power machines; Size 45 … 180; Nominal pressure 280 bar ...

Axial piston variable pump A10VNO series 52 and 53 Americas

Features. ▷ Variable pump with axial piston rotary group of swash- plate design for hydrostatic drives in open circuits. ▷ The flow is proportional to the ...

Axial piston variable pump | Bosch Rexroth AG

Axial piston variable pump. A10VNO series 5x. For low pressure applications such as in tractors or for fan drives; Size 28 … 85; Nominal pressure 210 bar ...

A10VNO series 5x - Bosch Rexroth

Axial piston variable pump. A10VNO series 5x. For low pressure applications such as in tractors or for fan drives; Size 28 … 85; Nominal pressure 210 bar ...

Axial piston pumps | Bosch Rexroth USA

Axial piston pumps in swash plate and bent axis design are intended for the medium and high pressure range. Numerous variations in the designs, ...

Axial piston variable pump | Bosch Rexroth AG

Axial piston variable pump. A10VO series 31. All-purpose medium pressure pump; Size 18 … 100; Nominal pressure 280 bar; Maximum pressure 350 bar ...

BOSCH REXROTH A A10VNO 45 DRG/52L-VRC40N INTERCHANGE

Bosch Rexroth A10VNO Axial Piston Pumps Part series A A10VNO 45 DRG/52L-VRC40N is a potential replacement for these common bearing part numbers:

  • A A10VNO 45 DRG/52L-VRC40N

  • A A10VNO 45 DRG/52L-VRC40N

  • A A10VNO 45 DRG/52L-VRC40N

  • A A10VNO 45 DRG/52L-VRC40N

  • A A10VNO 45 DRG/52L-VRC40N

  • A A10VNO 45 DRG/52L-VRC40N

  • A A10VNO 45 DRG/52L-VRC40N

  • A A10VNO 45 DRG/52L-VRC40N

Contact Us

LINDE HPR HYDRAULIC PUMP SUPPLIER
Address
Phone(Working Time)
Fax
  • LINDE HPR 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 A A10VNO 45 DRG/52L-VRC40N Technical Articles

How does a variable displacement hydraulic pump work?
The Basics of Variable-Displacement Pump Controls - Fluid Nov 14, 2016 — The amount of flow that each pump can provide is dependent on a rotating group of pistons. By varying the stroke of the pistons, we adjust the  Engineering Essentials: Fundamentals...
What are piston pumps used for?
Piston Pumps | Engineers EdgePiston pumps are used as hydraulic pumps to power heavy machinery, but they are also useful in smaller machines such as paint sprayers. This pump type can  Piston Pump - an overview | ScienceDirect TopicsPiston pumps provide...
What are the advantages and disadvantages of piston pump?
Reciprocating Pump: Types, Advantages & DisadvantagesDisadvantages of Reciprocating Pump: · This reciprocating pum has high wear and tear therefore requiring very high maintenance. · The flow is not uniform, so we  Piston Pump: working, parts,...

Bosch Rexroth A10VNO Axial Piston Pumps CATEGORIES

  • Linde HPR Hydraulic Pump
  • Kawasaki K5V Hydraulic Pump
  • Kawasaki K3VL Axial Piston Pump
  • Kawasaki K3VG Variable Displacement Axial Piston Pump
  • Kawasaki K3V Hydraulic Pump
  • Bosch Rexroth A8VO Variable Displacement Pumps
  • Bosch Rexroth A4VSG Axial Piston Variable Pump
  • Bosch Rexroth A7VO Variable Displacement Pumps
  • Bosch Rexroth A4VTG Axial Piston Variable Pump
  • Bosch Rexroth A4VSO Variable Displacement Pumps
  • Bosch Rexroth A4VG Variable Displacement Pumps
  • Bosch Rexroth A4V Variable Pumps
  • Bosch Rexroth A10VG Axial Piston Variable Pump
  • Bosch Rexroth A10VO Piston Pumps
  • Bosch Rexroth A10VSO Variable Displacement Pumps
  • Bosch Rexroth A11VG Hydraulic Pumps
  • Bosch Rexroth A11VLO Axial Piston Variable Pump
  • Bosch Rexroth A11VO Axial Piston Pump
  • Bosch Rexroth A15VSO Axial Piston Pump
  • Bosch Rexroth A2FO Fixed Displacement Pumps
  • Bosch Rexroth A10VNO Axial Piston Pumps
  • Bosch Rexroth A2V Variable Displacement Pumps
More

Customers Who Viewed BOSCH REXROTH A A10VNO 45 DRG/52L-VRC40N Bearing Also Viewed

  • AL A10VNO 28LA8DS/53R-VTE12N00-S2483 BOSCH REXROTH A10VNO Axial Piston Pumps
  • A A10CNO 63 DFR1/52R-VWC12H602D-S1536 BOSCH REXROTH A10CNO Piston Pump
  • AL A10VNO 45 DFR1/52R-VSC40N00-S5084 BOSCH REXROTH A10VNO Axial Piston Pumps
  • AL A10VNO 63 ED71/52L-VRC11N00T-S3457 BOSCH REXROTH A10VNO Axial Piston Pumps
  • G A10CNO 63 OV/52R-VWC12H002D -SO749 BOSCH REXROTH A10CNO Piston Pump
 
  • About Us|
  • Contact Us|
  • Site Map
  • Sitemaps

LINDE HPR HYDRAULIC PUMP SUPPLIER. Copyright © 2017 - 2023 All Rights Reserved.

  • Home
  • Stock Categories
    • Linde HPR Hydraulic Pump
    • Kawasaki K5V Hydraulic Pump
    • Kawasaki K3VL Axial Piston Pump
    • Kawasaki K3VG Variable Displacement Axial Piston Pump
    • Kawasaki K3V Hydraulic Pump
    • Bosch Rexroth A8VO Variable Displacement Pumps
    • Bosch Rexroth A4VSG Axial Piston Variable Pump
    • Bosch Rexroth A7VO Variable Displacement Pumps
    • Bosch Rexroth A4VTG Axial Piston Variable Pump
    • Bosch Rexroth A4VSO Variable Displacement Pumps
    • Bosch Rexroth A4VG Variable Displacement Pumps
    • Bosch Rexroth A4V Variable Pumps
    • Bosch Rexroth A10VG Axial Piston Variable Pump
    • Bosch Rexroth A10VO Piston Pumps
    • Bosch Rexroth A10VSO Variable Displacement Pumps
    • Bosch Rexroth A11VG Hydraulic Pumps
    • Bosch Rexroth A11VLO Axial Piston Variable Pump
    • Bosch Rexroth A11VO Axial Piston Pump
    • Bosch Rexroth A15VSO Axial Piston Pump
    • Bosch Rexroth A2FO Fixed Displacement Pumps
    • Bosch Rexroth A10VNO Axial Piston Pumps
    • Bosch Rexroth A2V Variable Displacement Pumps
  • Technical Articles
  • Linde HPR Hydraulic Pump
  • Kawasaki K5V Hydraulic Pump
  • Kawasaki K3VL Axial Piston Pump
✖

Home

Stock Categories

Technical Articles

Linde HPR Hydraulic Pump

Kawasaki K5V Hydraulic Pump

Kawasaki K3VL Axial Piston Pump

Contact Us