Qingdao XMD Autos Ball Bearing Co., Ltd.
Qingdao XMD Autos Ball Bearing Co., Ltd.
TOKYO KEIKI Piston Pump P*V Series   TOKYO KEIKI Single Vane Pump   TOKYO KEIKI Double Vane Pump  
English
English
  • Home
  • Stock Categories
    • TOKYO KEIKI Piston Pump P*V Series
    • TOKYO KEIKI Single Vane Pump
    • TOKYO KEIKI Double Vane Pump
    • TOKYO KEIKI Triple Vane Pump
    • TOKYO KEIKI Piston Pump P Series
    • TOKYO KEIKI Vane Pump
    • FAG Bearing
    • IKO Bearing
    • KOYO Bearing
    • NSK Bearing
    • NTN Bearing
    • SKF Bearing
    • Timken Bearing
    • AMI Bearing
    • AURORA Bearing
    • REXROTH Throttle check valves
    • REXROTH Directional spool valves
    • REXROTH Throttle check valve
    • REXROTH Directional poppet valves
    • REXROTH Check valves
    • REXROTH Throttle valves
    • REXROTH Twin throttle check valve
    • REXROTH Valves
    • REXROTH Pressure relief valve
    • REXROTH HY-CHECK VALVE
    • REXROTH Pressure reducing valve
    • Jm716610 Bearing
    • 212049 Bearing
    • Jlm704610 Bearing
    • Hm212049 Bearing
    • Large Slewing Bearings
    • Slewing Ring Bearings
    • Bearing Slewing Ring
    • Kaydon Slewing Bearing
    • THK Linear Guide
    • THK Miniature Linear Guide
    • THK Linear Guide Rails
    • High Temperature Linear Guide
    • Curved Linear Guide
    • THK Linear Bearings And Rails
    • THK Linear Motion
    • Double-row Cylindrical Roller Bearings
    • Four-row Cylindrical Roller Bearings
    • Bearings For Metric And Inch Shaft Sizes
    • Cylindrical Roller Bearings
  • Technical Articles
  • TOKYO KEIKI Piston Pump P*V Series
  • TOKYO KEIKI Single Vane Pump
  • TOKYO KEIKI Double Vane Pump
✖

Home

Stock Categories

Technical Articles

TOKYO KEIKI Piston Pump P*V Series

TOKYO KEIKI Single Vane Pump

TOKYO KEIKI Double Vane Pump

Home>Products>KOYO Bearing>KOYO 6303-2RS/C4 Single Row Ball Bearings

  • KOYO 6303-2RS/C4 Single Row Ball Bearings
  • KOYO 6303-2RS/C4 Single Row Ball Bearings
  • KOYO 6303-2RS/C4 Single Row Ball Bearings
  • KOYO 6303-2RS/C4 Single Row Ball Bearings
  • KOYO 6303-2RS/C4 Single Row Ball Bearings
  • KOYO 6303-2RS/C4 Single Row Ball Bearings

KOYO 6303-2RS/C4 MODELS

Need a CAD or 3D Model?

What is 6303-2RS/C4 bearing interchange？
Contact NowWhatsAppBe Our Agent

KOYO 6303-2RS/C4 Single Row Ball Bearings

category

KOYO Bearing

KOYO 6303-2RS/C4 Bearing SPECIFICATIONS

  • KOYO 6303-2RS/C4 Single Row Ball Bearings, Units and Housings Male Threaded rod end type: CAD models , KOYO Bearing Manufacturing Service . Qingdao XMD Autos Ball Bearing Co., Ltd. Get Your Free. Right Hand thread direction:

  • KOYO

  • 6303-2RS/C4

  • 737000
  • EE737181
  • 737260
  • Imperial
  • 92.30 Kg
  • Pin-Type
  • 457.200 mm
  • 660.400 mm
Download KOYO 6303-2RS/C4 Spec Sheet
Qingdao XMD Autos Ball Bearing Co., Ltd.

Qingdao XMD Autos Ball Bearing Co., Ltd.China

  • Qingdao XMD Autos Ball Bearing 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

KOYO 6303-2RS/C4 Single Row Ball Bearings Interchange guide

  • 737000
  • EE737181
  • 737260
  • Imperial
  • 92.30 Kg
  • Pin-Type
  • 457.200 mm
  • 660.400 mm
  • 85.725 mm
  • 62.705 mm
  • 91.280 mm
  • 10.410 mm
  • 6.35 mm
  • 488.95 mm
  • 503.94 mm
  • 618.00 mm
  • 614.93 mm
  • 9.65 mm
  • 12.19 mm
  • 16.8 mm
  • 103000 lbf
  • 396000 lbf
  • 816000 lbf
  • 65700 lbf
  • 1.56
  • 0.37
  • 1.6
  • 4809.1
  • 573.4
  • 0.225
KOYO 6303-2RS/C4 Single Row Ball Bearings pdf

KOYO 6303-2RS/C4 KOYO Technology

Sponsored products related to KOYO 6303-2RS/C4 Single Row Ball Bearings

No.BranddDBCSizeWidthr min.Weight
713630300FAG - - - - - - - -
713630330FAG - - - - - - - -
713630350FAG - - - - - - - -
713630360FAG - - - - - - - -
713630370FAG - - - - - - - -
713630380FAG - - - - - - - -
W6303CYSD17 mm47 mm22,2 mm13,58 kN17x47x22.222,20,5 mm0,191 Kg
W6303-2RSCYSD17 mm47 mm22,2 mm13,58 kN17x47x22.222,20,5 mm0,191 Kg
W6303-2RSNRCYSD17 mm47 mm22,2 mm13,58 kN17x47x22.222,20,5 mm0,191 Kg
W6303-ZZCYSD17 mm47 mm22,2 mm13,58 kN17x47x22.222,20,5 mm0,191 Kg
CRF-6303 2RSALoyal17,00047,000 - - 17x47x1414,000 - 0.111

 

KOYO 63/222RSC3 Single Row Ball BearingsSeries:737000; Cone Part Number:EE737181; Cup Part Number:737260; Design Units:Imperial; Bearing Weight:92.30 Kg; Cage Type:Pin-Type; d:457.200 mm; D:660.400 mm; B - Cone Width:85.725 mm; C - Cup Width:62.705 mm; B:91.280 mm; R - Cone Backface To Clear Radius1:10.410 mm; r - Cup Backface To Clear Radius2:6.35 mm; da - Cone Frontface Backing Diameter:488.95 mm; db - Cone Backface Backing Diameter:503.94 mm; Da - Cup Frontface Backing Diameter:618.00 mm; Db - Cup Backface Backing Diameter:614.93 mm; Ab - Cage-Cone Frontface Clearance:9.65 mm; Aa - Cage-Cone Backface Clearance:12.19 mm; a - Effective Center Location3:16.8 mm; C90 - Dynamic Radial Rating (90 million revolutions)4:103000 lbf; C1 - Dynamic Radial Rating (1 million revolutions)5:396000 lbf; C0 - Static Radial Rating:816000 lbf; Ca90 - Dynamic Thrust Rating (90 million revolutions)6:65700 lbf; K - Factor7:1.56; e - ISO Factor8:0.37; Y - ISO Factor9:1.6; G1 - Heat Generation Factor (Roller-Raceway):4809.1; G2 - Heat Generation Factor (Rib-Roller End):573.4; Cg - Geometry Factor:0.225;
0 Inch | 0 Millimeter x 5.909 Inch | 150.089 Millimeter x 1.438 Inch | 36.525 Millimeter KOYO 742 Tapered Roller BearingsSeries:737000; Cone Part Number:EE737181; Cup Part Number:737260; Design Units:Imperial; Bearing Weight:92.30 Kg; Cage Type:Pin-Type; d:457.200 mm; D:660.400 mm; B - Cone Width:85.725 mm; C - Cup Width:62.705 mm; B:91.280 mm; R - Cone Backface To Clear Radius1:10.410 mm; r - Cup Backface To Clear Radius2:6.35 mm; da - Cone Frontface Backing Diameter:488.95 mm; db - Cone Backface Backing Diameter:503.94 mm; Da - Cup Frontface Backing Diameter:618.00 mm; Db - Cup Backface Backing Diameter:614.93 mm; Ab - Cage-Cone Frontface Clearance:9.65 mm; Aa - Cage-Cone Backface Clearance:12.19 mm; a - Effective Center Location3:16.8 mm; C90 - Dynamic Radial Rating (90 million revolutions)4:103000 lbf; C1 - Dynamic Radial Rating (1 million revolutions)5:396000 lbf; C0 - Static Radial Rating:816000 lbf; Ca90 - Dynamic Thrust Rating (90 million revolutions)6:65700 lbf; K - Factor7:1.56; e - ISO Factor8:0.37; Y - ISO Factor9:1.6; G1 - Heat Generation Factor (Roller-Raceway):4809.1; G2 - Heat Generation Factor (Rib-Roller End):573.4; Cg - Geometry Factor:0.225;
0.625 Inch | 15.875 Millimeter x 0.875 Inch | 22.225 Millimeter x 1 Inch | 25.4 Millimeter KOYO BH-1016 Needle Non Thrust Roller BearingsSeries:737000; Cone Part Number:EE737181; Cup Part Number:737260; Design Units:Imperial; Bearing Weight:92.30 Kg; Cage Type:Pin-Type; d:457.200 mm; D:660.400 mm; B - Cone Width:85.725 mm; C - Cup Width:62.705 mm; B:91.280 mm; R - Cone Backface To Clear Radius1:10.410 mm; r - Cup Backface To Clear Radius2:6.35 mm; da - Cone Frontface Backing Diameter:488.95 mm; db - Cone Backface Backing Diameter:503.94 mm; Da - Cup Frontface Backing Diameter:618.00 mm; Db - Cup Backface Backing Diameter:614.93 mm; Ab - Cage-Cone Frontface Clearance:9.65 mm; Aa - Cage-Cone Backface Clearance:12.19 mm; a - Effective Center Location3:16.8 mm; C90 - Dynamic Radial Rating (90 million revolutions)4:103000 lbf; C1 - Dynamic Radial Rating (1 million revolutions)5:396000 lbf; C0 - Static Radial Rating:816000 lbf; Ca90 - Dynamic Thrust Rating (90 million revolutions)6:65700 lbf; K - Factor7:1.56; e - ISO Factor8:0.37; Y - ISO Factor9:1.6; G1 - Heat Generation Factor (Roller-Raceway):4809.1; G2 - Heat Generation Factor (Rib-Roller End):573.4; Cg - Geometry Factor:0.225;
1.375 Inch | 34.925 Millimeter x 0 Inch | 0 Millimeter x 1.125 Inch | 28.575 Millimeter KOYO 31594 Tapered Roller BearingsSeries:737000; Cone Part Number:EE737181; Cup Part Number:737260; Design Units:Imperial; Bearing Weight:92.30 Kg; Cage Type:Pin-Type; d:457.200 mm; D:660.400 mm; B - Cone Width:85.725 mm; C - Cup Width:62.705 mm; B:91.280 mm; R - Cone Backface To Clear Radius1:10.410 mm; r - Cup Backface To Clear Radius2:6.35 mm; da - Cone Frontface Backing Diameter:488.95 mm; db - Cone Backface Backing Diameter:503.94 mm; Da - Cup Frontface Backing Diameter:618.00 mm; Db - Cup Backface Backing Diameter:614.93 mm; Ab - Cage-Cone Frontface Clearance:9.65 mm; Aa - Cage-Cone Backface Clearance:12.19 mm; a - Effective Center Location3:16.8 mm; C90 - Dynamic Radial Rating (90 million revolutions)4:103000 lbf; C1 - Dynamic Radial Rating (1 million revolutions)5:396000 lbf; C0 - Static Radial Rating:816000 lbf; Ca90 - Dynamic Thrust Rating (90 million revolutions)6:65700 lbf; K - Factor7:1.56; e - ISO Factor8:0.37; Y - ISO Factor9:1.6; G1 - Heat Generation Factor (Roller-Raceway):4809.1; G2 - Heat Generation Factor (Rib-Roller End):573.4; Cg - Geometry Factor:0.225;
KOYO NTHA-4270 Thrust Roller BearingSeries:737000; Cone Part Number:EE737181; Cup Part Number:737260; Design Units:Imperial; Bearing Weight:92.30 Kg; Cage Type:Pin-Type; d:457.200 mm; D:660.400 mm; B - Cone Width:85.725 mm; C - Cup Width:62.705 mm; B:91.280 mm; R - Cone Backface To Clear Radius1:10.410 mm; r - Cup Backface To Clear Radius2:6.35 mm; da - Cone Frontface Backing Diameter:488.95 mm; db - Cone Backface Backing Diameter:503.94 mm; Da - Cup Frontface Backing Diameter:618.00 mm; Db - Cup Backface Backing Diameter:614.93 mm; Ab - Cage-Cone Frontface Clearance:9.65 mm; Aa - Cage-Cone Backface Clearance:12.19 mm; a - Effective Center Location3:16.8 mm; C90 - Dynamic Radial Rating (90 million revolutions)4:103000 lbf; C1 - Dynamic Radial Rating (1 million revolutions)5:396000 lbf; C0 - Static Radial Rating:816000 lbf; Ca90 - Dynamic Thrust Rating (90 million revolutions)6:65700 lbf; K - Factor7:1.56; e - ISO Factor8:0.37; Y - ISO Factor9:1.6; G1 - Heat Generation Factor (Roller-Raceway):4809.1; G2 - Heat Generation Factor (Rib-Roller End):573.4; Cg - Geometry Factor:0.225;
2.25 Inch | 57.15 Millimeter x 0 Inch | 0 Millimeter x 1.188 Inch | 30.175 Millimeter KOYO 39581 Tapered Roller BearingsSeries:737000; Cone Part Number:EE737181; Cup Part Number:737260; Design Units:Imperial; Bearing Weight:92.30 Kg; Cage Type:Pin-Type; d:457.200 mm; D:660.400 mm; B - Cone Width:85.725 mm; C - Cup Width:62.705 mm; B:91.280 mm; R - Cone Backface To Clear Radius1:10.410 mm; r - Cup Backface To Clear Radius2:6.35 mm; da - Cone Frontface Backing Diameter:488.95 mm; db - Cone Backface Backing Diameter:503.94 mm; Da - Cup Frontface Backing Diameter:618.00 mm; Db - Cup Backface Backing Diameter:614.93 mm; Ab - Cage-Cone Frontface Clearance:9.65 mm; Aa - Cage-Cone Backface Clearance:12.19 mm; a - Effective Center Location3:16.8 mm; C90 - Dynamic Radial Rating (90 million revolutions)4:103000 lbf; C1 - Dynamic Radial Rating (1 million revolutions)5:396000 lbf; C0 - Static Radial Rating:816000 lbf; Ca90 - Dynamic Thrust Rating (90 million revolutions)6:65700 lbf; K - Factor7:1.56; e - ISO Factor8:0.37; Y - ISO Factor9:1.6; G1 - Heat Generation Factor (Roller-Raceway):4809.1; G2 - Heat Generation Factor (Rib-Roller End):573.4; Cg - Geometry Factor:0.225;
KOYO 3NC6226ZZXC3 Single Row Ball BearingsSeries:737000; Cone Part Number:EE737181; Cup Part Number:737260; Design Units:Imperial; Bearing Weight:92.30 Kg; Cage Type:Pin-Type; d:457.200 mm; D:660.400 mm; B - Cone Width:85.725 mm; C - Cup Width:62.705 mm; B:91.280 mm; R - Cone Backface To Clear Radius1:10.410 mm; r - Cup Backface To Clear Radius2:6.35 mm; da - Cone Frontface Backing Diameter:488.95 mm; db - Cone Backface Backing Diameter:503.94 mm; Da - Cup Frontface Backing Diameter:618.00 mm; Db - Cup Backface Backing Diameter:614.93 mm; Ab - Cage-Cone Frontface Clearance:9.65 mm; Aa - Cage-Cone Backface Clearance:12.19 mm; a - Effective Center Location3:16.8 mm; C90 - Dynamic Radial Rating (90 million revolutions)4:103000 lbf; C1 - Dynamic Radial Rating (1 million revolutions)5:396000 lbf; C0 - Static Radial Rating:816000 lbf; Ca90 - Dynamic Thrust Rating (90 million revolutions)6:65700 lbf; K - Factor7:1.56; e - ISO Factor8:0.37; Y - ISO Factor9:1.6; G1 - Heat Generation Factor (Roller-Raceway):4809.1; G2 - Heat Generation Factor (Rib-Roller End):573.4; Cg - Geometry Factor:0.225;
0 Inch | 0 Millimeter x 3.543 Inch | 89.992 Millimeter x 0.625 Inch | 15.875 Millimeter KOYO 362 Tapered Roller BearingsSeries:737000; Cone Part Number:EE737181; Cup Part Number:737260; Design Units:Imperial; Bearing Weight:92.30 Kg; Cage Type:Pin-Type; d:457.200 mm; D:660.400 mm; B - Cone Width:85.725 mm; C - Cup Width:62.705 mm; B:91.280 mm; R - Cone Backface To Clear Radius1:10.410 mm; r - Cup Backface To Clear Radius2:6.35 mm; da - Cone Frontface Backing Diameter:488.95 mm; db - Cone Backface Backing Diameter:503.94 mm; Da - Cup Frontface Backing Diameter:618.00 mm; Db - Cup Backface Backing Diameter:614.93 mm; Ab - Cage-Cone Frontface Clearance:9.65 mm; Aa - Cage-Cone Backface Clearance:12.19 mm; a - Effective Center Location3:16.8 mm; C90 - Dynamic Radial Rating (90 million revolutions)4:103000 lbf; C1 - Dynamic Radial Rating (1 million revolutions)5:396000 lbf; C0 - Static Radial Rating:816000 lbf; Ca90 - Dynamic Thrust Rating (90 million revolutions)6:65700 lbf; K - Factor7:1.56; e - ISO Factor8:0.37; Y - ISO Factor9:1.6; G1 - Heat Generation Factor (Roller-Raceway):4809.1; G2 - Heat Generation Factor (Rib-Roller End):573.4; Cg - Geometry Factor:0.225;

 

 

KOYO 6303-2RS/C4 Single Row Ball Bearings Video

 

KOYO 6303-2RS/C4 INTERCHANGE

KOYO Bearing Part series 6303-2RS/C4 is a potential replacement for these common bearing part numbers:

  • 6303-2RS/C4

  • 6303-2RS/C4

  • 6303-2RS/C4

  • 6303-2RS/C4

  • 6303-2RS/C4

  • 6303-2RS/C4

  • 6303-2RS/C4

  • 6303-2RS/C4

Contact Us

Qingdao XMD Autos Ball Bearing Co., Ltd.
AddressNO.16 KeYuanWei Third RD,Qingdao,Shandong,China
Phone(Working Time)86-02-7515247
Fax
  • Qingdao XMD Autos Ball Bearing 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

KOYO 6303-2RS/C4 Technical Articles

Can you drive with bad engine bearings?
5 Common Engine Bearing Failure Symptoms – CAR FROMDec 24, 2018 — How long can you drive a car with a bad wheel bearing? Loss of oil pressure is also one of engine bearing failure symptoms you need to  How to Know When a Rod or Main...
How are bearings written?
Bearings - Interactive Maths Series software (interactiveIt is used to find a direction or bearing . The true bearing to a point is the angle measured in degrees in a clockwise To state the direction of a point, write: Bearings - Mathematics GCSE...
How much grease should you add to a motor bearing?
Electric Motor Bearing Greasing Basics - Reliabilityweb: ABearings should be lubricated at an average frequency as found in Table 2. We are limiting this paper to a standard deep-groove ball bearing without shields or When too much grease is added, the...

KOYO Bearing CATEGORIES

  • TOKYO KEIKI Piston Pump P*V Series
  • TOKYO KEIKI Single Vane Pump
  • TOKYO KEIKI Double Vane Pump
  • TOKYO KEIKI Triple Vane Pump
  • TOKYO KEIKI Piston Pump P Series
  • TOKYO KEIKI Vane Pump
  • FAG Bearing
  • IKO Bearing
  • KOYO Bearing
  • NSK Bearing
  • NTN Bearing
  • SKF Bearing
  • Timken Bearing
  • AMI Bearing
  • AURORA Bearing
  • REXROTH Throttle check valves
  • REXROTH Directional spool valves
  • REXROTH Throttle check valve
  • REXROTH Directional poppet valves
  • REXROTH Check valves
  • REXROTH Throttle valves
  • REXROTH Twin throttle check valve
  • REXROTH Valves
  • REXROTH Pressure relief valve
  • REXROTH HY-CHECK VALVE
  • REXROTH Pressure reducing valve
  • Jm716610 Bearing
  • 212049 Bearing
  • Jlm704610 Bearing
  • Hm212049 Bearing
  • Large Slewing Bearings
  • Slewing Ring Bearings
  • Bearing Slewing Ring
  • Kaydon Slewing Bearing
  • THK Linear Guide
  • THK Miniature Linear Guide
  • THK Linear Guide Rails
  • High Temperature Linear Guide
  • Curved Linear Guide
  • THK Linear Bearings And Rails
  • THK Linear Motion
  • Double-row Cylindrical Roller Bearings
  • Four-row Cylindrical Roller Bearings
  • Bearings For Metric And Inch Shaft Sizes
  • Cylindrical Roller Bearings
More

Customers Who Viewed KOYO 6303-2RS/C4 Bearing Also Viewed

  • KOYO NTA-2031;PDL449 Thrust Roller Bearing
  • 1.25 Inch | 31.75 Millimeter x 0 Inch | 0 Millimeter x 0.66 Inch | 16.764 Millimeter KOYO LM67048 Tapered Roller Bearings
  • KOYO 1217KC3 Self Aligning Ball Bearings
  • KOYO FNT-2542;PDL001 Thrust Roller Bearing
  • KOYO 1210K Self Aligning Ball Bearings

Top Products

TIMKEN RFC1 1/8 Flange Block Bearings KOYO NTHA-4270 Thrust Roller Bearing FAG NU2326-E-M1A-C3 Cylindrical Roller Bearings
TOKYO KEIKI SQP31-17-6-86CD-18 Double Vane Pump Timken m88043 Bearing
 
  • About Us|
  • Contact Us|
  • Site Map
  • Sitemaps

Qingdao XMD Autos Ball Bearing Co., Ltd.. Copyright © 2017 - 2024 All Rights Reserved.

  • Home
  • Stock Categories
    • TOKYO KEIKI Piston Pump P*V Series
    • TOKYO KEIKI Single Vane Pump
    • TOKYO KEIKI Double Vane Pump
    • TOKYO KEIKI Triple Vane Pump
    • TOKYO KEIKI Piston Pump P Series
    • TOKYO KEIKI Vane Pump
    • FAG Bearing
    • IKO Bearing
    • KOYO Bearing
    • NSK Bearing
    • NTN Bearing
    • SKF Bearing
    • Timken Bearing
    • AMI Bearing
    • AURORA Bearing
    • REXROTH Throttle check valves
    • REXROTH Directional spool valves
    • REXROTH Throttle check valve
    • REXROTH Directional poppet valves
    • REXROTH Check valves
    • REXROTH Throttle valves
    • REXROTH Twin throttle check valve
    • REXROTH Valves
    • REXROTH Pressure relief valve
    • REXROTH HY-CHECK VALVE
    • REXROTH Pressure reducing valve
    • Jm716610 Bearing
    • 212049 Bearing
    • Jlm704610 Bearing
    • Hm212049 Bearing
    • Large Slewing Bearings
    • Slewing Ring Bearings
    • Bearing Slewing Ring
    • Kaydon Slewing Bearing
    • THK Linear Guide
    • THK Miniature Linear Guide
    • THK Linear Guide Rails
    • High Temperature Linear Guide
    • Curved Linear Guide
    • THK Linear Bearings And Rails
    • THK Linear Motion
    • Double-row Cylindrical Roller Bearings
    • Four-row Cylindrical Roller Bearings
    • Bearings For Metric And Inch Shaft Sizes
    • Cylindrical Roller Bearings
  • Technical Articles
  • TOKYO KEIKI Piston Pump P*V Series
  • TOKYO KEIKI Single Vane Pump
  • TOKYO KEIKI Double Vane Pump
✖

Home

Stock Categories

Technical Articles

TOKYO KEIKI Piston Pump P*V Series

TOKYO KEIKI Single Vane Pump

TOKYO KEIKI Double Vane Pump

Contact Us