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>A10CNO63DFR1-52R-VWC12H602D-S BOSCH REXROTH A10CNO Piston Pump

  • A10CNO63DFR1-52R-VWC12H602D-S BOSCH REXROTH A10CNO Piston Pump
  • A10CNO63DFR1-52R-VWC12H602D-S BOSCH REXROTH A10CNO Piston Pump

BOSCH REXROTH A10CNO63DFR1-52R-VWC12H602D-S MODELS

Need a CAD or 3D Model?

What is A10CNO63DFR1-52R-VWC12H602D-S bearing cross reference？
Contact NowWhatsAppBe Our Agent

A10CNO63DFR1-52R-VWC12H602D-S BOSCH REXROTH A10CNO Piston Pump

category

Bosch Rexroth A10VNO Axial Piston Pumps

BOSCH REXROTH A10CNO63DFR1-52R-VWC12H602D-S Bearing SPECIFICATIONS

  • LET OUR A10CNO63DFR1-52R-VWC12H602D-S BOSCH REXROTH A10CNO Piston Pump EXPERTS 2 x SR-1518 Stabilizing ring GET YOU 38.1 mm h THE PARTS 21.3 kg Mass pillow block YOU NEED.

  • BOSCH REXROTH

  • A10CNO63DFR1-52R-VWC12H602D-S

  • 21.3 kg
  • 38.1 mm
  • 2 x SR-1518
  • 286.33 g
  • 160 mm
  • 19.05 mm
  • 82.55 mm
  • 38.3 kN
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

  • 21.3 kg
  • 38.1 mm
  • 2 x SR-1518
  • 286.33 g
  • 160 mm
  • 19.05 mm
  • 82.55 mm
  • 38.3 kN
  • 1/8 NPT
  • TER 189
  • 34.7 kN
  • 27.781 mm
  • 60.9 kN
  • 98.425 mm
  • 41.275 mm
  • 149.1 N·m
  • 101 kN
  • 2 x 5/8-11 UNC
  • 60.325 mm
  • 34.925 mm

BOSCH REXROTH A10CNO63DFR1-52R-VWC12H602D-S A10CNO63DFR1-52R-VWC12H602D-S BOSCH REXROTH A10CNO Piston Pump Dimensions

 

AL A10VNO 28 DR/53L-VTE11N00-S3456 BOSCH REXROTH A10VNO Axial Piston PumpsSealed Speed Rating n3:1600 rpm; B:38.00 mm; d:160.000 mm; Basic Dynamic Radial Load Rating C:143000 N; Accessories:Two Seals & Snap-Rin; D:240.0000 mm; Fillet Radius ra:2.00 mm; Grease Speed Rating Open/Shielded n1:2400 rpm; Oil Speed Rating Open/Shielded n2:3000 rpm; Basic Static Radial Load Rating Co:143000 N;
ALA10CO63DRS/53L-VRDXXH143D-S3161 BOSCH REXROTH A10CO Piston PumpA5:26 mm; A:38.5 mm; Fatigue load limit Pu:0.8 kN; B:49.2 mm; s1:30.2 mm; d:36.512 mm; Basic static load rating C0:19 kN; Recommended tightening torque for grub screw:6.5 N·m; Thread grub screw G2:5/16-24 UNF; A1:14 mm; SWN:7 mm; Recommended diameter for attachment bolts, inch G:0.5 in; Db2:106 mm; Housing material:Cast iron; Db1:98 mm; N4:4 mm; J6:118 mm; Hexagonal key size for grub screw N:3.969 mm;
A A10VNO 45 DFR1/52L-HTC40N00 -S1421 BOSCH REXROTH A10VNO Axial Piston PumpsBasic static load rating C0:69.5 kN; Mass bearing:0.37 kg; Reference speed:7000 r/min; Basic dynamic load rating C:66.8 kN; Da min.:68 mm; B:19.842 mm; db min.:58 mm; a:17.068 mm; C:15.08 mm; r1,2 min.:3.5 mm; Ca min.:4 mm; Dimension series:LM 603000; rb max.:0.3 mm; Calculation factor Y0:0.8; Cb min.:4.5 mm; Calculation factor Y:1.4; D:77.788 mm; r3,4 min.:0.3 mm; T:19.842 mm; da max.:52 mm;
GA10VNO63OV/52R-HSC40N00-S3475*SV* BOSCH REXROTH A10VNO Axial Piston PumpsPermissible sliding velocity v min.:0 m/s; Specific static load factor K0:120 N/mm²; Mass bushing:0.1 kg; Coefficient of friction µ max.:0.15; Tolerance housing:H7 m/s; Coefficient of friction µ min.:0.08; d:50 mm; Tolerance shaft:f7 m/s; B:25 mm; Permissible sliding velocity v max.:1 m/s; Specific dynamic load factor K:40 N/mm²; D:55 mm;
AL A10CNO 63 DFR1/52R-VWC12H902D-S428 BOSCH REXROTH A10CNO Piston PumpN1:22.225 mm; Appropriate attachment bolt size G:0.75 in; H2:41.275 mm; Max. speed for PosiTrac Plus seal:2350 r/min; Pa:12.5 kN; Cap bolt recommended tightening torque:298.3 N·m; Da:160 mm; A2:149.225 mm; J min.:263.525 mm; P90°:72.5 kN; P180°:49.8 kN; Cap bolt:2 x 5/8-11 UNC; Labyrinth ring:2 x LOR 38; Stabilizing ring:SR-18-15; P60°:121 kN; H:192.088 mm; P150°:40.5 kN; R1:60.325 mm;
A A10CNO 63 DFR1/52R-VWC12H602D-S233 BOSCH REXROTH A10CNO Piston PumpMass adapter sleeve assembly:1.3 kg; Hydraulic nut:HMVC 17E; B1:62.89 mm; d3 max.:112.039 mm; G:84.836 mm; B:16.129 mm; Threads per inch:12; B4:17.704 mm; d:85 mm; d1:73.025 mm; Sleeve:S 17x2.7/8;
A A10C O 45 DFR1/52R-VWC12H502D-S4277 BOSCH REXROTH A10CO Piston PumpOil Speed Rating n2:6200 rpm; D:260.0000 mm; Fillet Radius ra:2.00 mm; Basic Dynamic Radial Load Rating C:281000 N; Grease Speed Rating n1:4100 rpm; Fillet Radius rb:1.00 mm; B:66.00 mm; Basic Static Radial Load Rating Co:440000 N; d:190.000 mm;
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 63 DRS/52R-VWC12N00-S2521 BOSCH REXROTH A10VNO Axial Piston Pumpsh:47.625 mm; Labyrinth ring:2 x LOR 185; J max.:333.375 mm; J min.:295.275 mm; Cap bolt recommended tightening torque:515.2 N·m; Da:180 mm; Housing:FSAF 617; N1:22.225 mm; R1:66.675 mm; PG:1/4 NPT; Initial grease fill:365.71 g; H1:114.3 mm; da:76.2 mm; H:222.25 mm; Pa:10.5 kN; End plug (suffix Y):EPR 10; R2:30.163 mm; ba:52.388 mm; Mass pillow block:25.5 kg; L:387.35 mm;
AL A10CNO 63 DFR1/52R-VWC12H902D-S428 BOSCH REXROTH A10CNO Piston PumpF:22 mm; r, r1,2 min.:0.3 mm; B:23 mm; Mass inner ring:0.027 kg; d:17 mm;
A10CO45DFR1-52R-VUC07H002D BOSCH REXROTH A10CO Piston PumpA:35.7 mm; Hexagonal key size for grub screw N:3.969 mm; R1:24 mm; Housing material:Stainless steel; A5:30.5 mm; Thread grub screw G2:5/16-24 UNF; Recommended tightening torque for grub screw:6.5 N·m; J:130.2 mm; B:42.9 mm; Db1:87 mm; N:14.3 mm; s1:25.4 mm; L:92.1 mm; Recommended diameter for attachment bolts, inch G:0.5 in; Recommended diameter for attachment bolts, mm G:12 mm; Mass bearing unit:1.35 kg;
A A10CNO 63 DFR1/52R-VWC12H602D-S1536 BOSCH REXROTH A10CNO Piston PumpDa max.:50.4 mm; db min.:34.6 mm; Static axial stiffness, preload class B:49 N/µm; d:30 mm; Calculation factor f:1.05; Calculation factor f1:1; Preload class C GC:300 N; Calculation factor f2A:1; Calculation factor f0:7.9; r1,2 min.:1 mm; d2:36.4 mm; a:12.2 mm; rb max.:0.6 mm; Ball diameter Dw:6.35 mm; D:55 mm; r3,4 min.:0.6 mm; Calculation factor f2C:1.05; Basic static load rating C0:5.2 kN;
A A10VNO 63 DFR5/52R-VSC11N00-S174 BOSCH REXROTH A10VNO Axial Piston Pumpsda max.:70 mm; Da min.:98 mm; d:60 mm; Calculation factor Y:1.8; d1 ≈:85.6 mm; T:40 mm; r1,2 min.:2.5 mm; rb max.:2.5 mm; Da max.:104.5 mm; Basic static load rating C0:260 kN; C:33 mm; Dimension series:2EE; ra max.:2.5 mm; Basic dynamic load rating C:239 kN; Ca min.:6 mm; Reference speed:4800 r/min; Fatigue load limit Pu:30 kN; Limiting speed:5600 r/min; B:39 mm; Calculation factor e:0.33;
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;
AL A10VNO 63 ED71/52L-VRC11N00T-S3457 BOSCH REXROTH A10VNO Axial Piston PumpsFillet Radius ra:0.12 in; B:1.2500 in; d:7.250 in; Oil Speed Rating n2:3800 rpm; Basic Static Radial Load Rating Co:166000 N; Basic Dynamic Radial Load Rating C:121000 N; Grease Speed Rating n1:2300 rpm; D:9.7500 in; Fillet Radius rb:0.060 in;
A A10CNO 45 DR/53L-VSC62H602D -S5047 BOSCH REXROTH A10CNO Piston Pumpd1:30.163 mm; B4:9 mm; B:8 mm; d:35 mm; G:M 35x1.5; d3:52 mm; Mass adapter sleeve assembly:0.12 kg; B1:29 mm;

 

 

No.BrandTwLsfBAC
A A10CNO 63 DFR1/52R-VWC12H602D-S233BOSCH REXROTH - - - - - 165 mm - -
GA10VNO63OV/52R-HSC40N00-S3475*SV*BOSCH REXROTH - - - - - 25 mm - -
AL A10VNO 85 DRF/53L-VWC11N00-S1856BOSCH REXROTH - - - - - 82.60 mm - -
A A10VNO 28 DRS/53L-VTC09N00-S2673BOSCH REXROTH - - - - - 36.50 mm - -
A10VNO45DFR1-52R-HRC40NBOSCH REXROTH - - - - - - - -
AL A10VNO 85EK1DS/53R-VSD46N00P -S4683BOSCH REXROTH - - - - - 10.00 mm - -
AL A10VNO 45 DRS/53R-VRC19N00-S3183BOSCH REXROTH114 mm - - - - - - -
A A10CNO63DFR1/52R-VWC12H702D-S274BOSCH REXROTH - - - - - 40.00 mm - -
A A10CNO 63 DFR1/52R-VWC12H802D-S4279BOSCH REXROTH - - - - - 28.042 mm - -
A10VNO45DFR1-52R-HTC40NBOSCH REXROTH - - - - - 33.30 mm - -
A10VNO85DRS/53R-VSC11NBOSCH REXROTH - - - - - 34.1 mm32 mm -
A A10VNO 63 DRS/52R-VRC11N00-S1518BOSCH REXROTH - - - - - 68.00 mm - -
A A10CNO 45 DFR1/52R-VRC07H503D -S1958BOSCH REXROTH - - - - - - - -
AL A10VNO 41ED 73/52R-VSC73N00P-S2538BOSCH REXROTH825.5 mm - - - - 825.5 mm - -
ALA10CO63DRS/53L-VRDXXH143D-S3161BOSCH REXROTH - - - - - 49.2 mm38.5 mm -
AL A10VNO63EK2ER/53L-VRC62N00P-SO644BOSCH REXROTH - - - - - 350 mm - -
AL A10VNO45ED72/53L-VSC12K52P-S5537BOSCH REXROTH - 41 mm - - - 25 mm - -
AL A10VNO 28LA8DS/53R-VTE12N00-S2483BOSCH REXROTH - - 831.85 mm - - - - -
A A10CNO 45 DFR1/52R-VSC07H503D-S1832BOSCH REXROTH - - - - - 23.00 mm - -
A A10CNO63DFR1/52R-VWC12H702D-S4278BOSCH REXROTH - - - - - - - -
AL A10VNO 45EP2D/53L-VRC11N00PBOSCH REXROTH - - - - - 70.00 mm - -
A A10VNO 41 DFR1/52R-HRC40N00 -S1005BOSCH REXROTH - - - - - 77.80 mm - -
A10VNO85DRS/53R+A10VNO45ED71/53RBOSCH REXROTH - - 209.55 mm - - - - -
A10VNO85DFR-53L-VWC11NBOSCH REXROTH - - - - - - - -
AL A10VNO 85 DRF/53L-VWC11N00-S1856BOSCH REXROTH - - - - - 52.40 mm - -

 

A10CNO63DFR1-52R-VWC12H602D-S BOSCH REXROTH A10CNO Piston Pump Video

 

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. A10VO series 32. Optimized medium pressure pump for high power machines; Size 45 … 180; Nominal pressure 280 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, ...

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 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 ...

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

BOSCH REXROTH A10CNO63DFR1-52R-VWC12H602D-S INTERCHANGE

Bosch Rexroth A10VNO Axial Piston Pumps Part series A10CNO63DFR1-52R-VWC12H602D-S is a potential replacement for these common bearing part numbers:

  • A10CNO63DFR1-52R-VWC12H602D-S

  • A10CNO63DFR1-52R-VWC12H602D-S

  • A10CNO63DFR1-52R-VWC12H602D-S

  • A10CNO63DFR1-52R-VWC12H602D-S

  • A10CNO63DFR1-52R-VWC12H602D-S

  • A10CNO63DFR1-52R-VWC12H602D-S

  • A10CNO63DFR1-52R-VWC12H602D-S

  • A10CNO63DFR1-52R-VWC12H602D-S

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 A10CNO63DFR1-52R-VWC12H602D-S 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 A10CNO63DFR1-52R-VWC12H602D-S 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 - 2024 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