KAWASAKI K3VL AXIAL PISTON PUMP SUPPLIER
KAWASAKI K3VL AXIAL PISTON PUMP SUPPLIER
Kawasaki K3vl Axial Piston Pump   Kawasaki K3vg Variable Displacement Axial Piston Pump   Kawasaki K3v Hydraulic Pump  
English
English
  • Home
  • Stock Categories
    • 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
    • Kawasaki K5v Hydraulic Pump
    • Linde Hpr Hydraulic Pump
  • Technical Articles
  • Kawasaki K3vl Axial Piston Pump
  • Kawasaki K3vg Variable Displacement Axial Piston Pump
  • Kawasaki K3v Hydraulic Pump
✖

Home

Stock Categories

Technical Articles

Kawasaki K3vl Axial Piston Pump

Kawasaki K3vg Variable Displacement Axial Piston Pump

Kawasaki K3v Hydraulic Pump

Home>Products>Bosch Rexroth A8vo Variable Displacement Pumps>A8VO80SR3-60R1-NZG05K04-K BOSCH REXROTH A8VO Variable Displacement Pumps

  • A8VO80SR3-60R1-NZG05K04-K BOSCH REXROTH A8VO Variable Displacement Pumps
  • A8VO80SR3-60R1-NZG05K04-K BOSCH REXROTH A8VO Variable Displacement Pumps

BOSCH REXROTH A8VO80SR3-60R1-NZG05K04-K MODELS

Need a CAD or 3D Model?

What is A8VO80SR3-60R1-NZG05K04-K bearing interchange？
Contact NowWhatsAppBe Our Agent

A8VO80SR3-60R1-NZG05K04-K BOSCH REXROTH A8VO Variable Displacement Pumps

category

Bosch Rexroth A8vo Variable Displacement Pumps

BOSCH REXROTH A8VO80SR3-60R1-NZG05K04-K Bearing SPECIFICATIONS

  • A8VO80SR3-60R1-NZG05K04-K BOSCH REXROTH A8VO Variable Displacement Pumps manufacturer and global supplier of reliable Yes End Cap Groove ball and roller Steel Ball Material ... A8VO80SR3-60R1-NZG05K04-K BOSCH REXROTH A8VO Variable Displacement Pumps Industries Cast Iron Housing Material Products Manufacturing & Engineering and Agricultural Bearings designed to meet the unique requirements of our targeted industries.

  • BOSCH REXROTH

  • A8VO80SR3-60R1-NZG05K04-K

  • Yes
  • Steel
  • Cast Iron
  • Unirex N2
  • Next Smaller Ring Si
  • Normal Duty
  • 206 Series
  • Std Retainer
KAWASAKI K3VL AXIAL PISTON PUMP SUPPLIER

KAWASAKI K3VL AXIAL PISTON PUMP SUPPLIERChina

  • KAWASAKI K3VL AXIAL PISTON 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

A8VO80SR3-60R1-NZG05K04-K BOSCH REXROTH A8VO Variable Displacement Pumps Description of the code

  • Yes
  • Steel
  • Cast Iron
  • Unirex N2
  • Next Smaller Ring Si
  • Normal Duty
  • 206 Series
  • Std Retainer
  • Rubberized
  • 782475891412
  • Round
  • Steel
  • Non-Expansion
  • Self Centering
  • 1.2500 in
  • Steel
  • Single Lip
  • Steel
  • 2 Bolt Pillow Block
  • Yes

BOSCH REXROTH A8VO80SR3-60R1-NZG05K04-K A8VO80SR3-60R1-NZG05K04-K BOSCH REXROTH A8VO Variable Displacement Pumps Code system

 

A8VO80LR3DS/60+A4FO28/32R BOSCH REXROTH A8VO Variable Displacement PumpsBearing Locking Device:Setscrew; Housing Series:207 SERIES (204 - 20; Ship Weight:20.2 LB; d:2.2500 in; Setscrew Angle:65; Seal Type:Triple Lip; Bearing Series:207 Series; Bearing Insert Material:Steel; Housing Type:Top Angle Take-Up; UPC:782475699964; Split Housing:NO; Grease Type:Mobilgrease XHP222; Shaft Attachment Type:SETSCREW; Housing Product Type:TYPE E; Bearing Bore Shape:Tapered; Expansion Type:Non-Expansion;
A8VO200LA1KH1/63R1-NZG05F00X-S BOSCH REXROTH A8VO Variable Displacement PumpsBearing Locking Device:Eccentric Collar; Bearing Outer Ring Material:Steel; Bearing Duty:Normal Duty; Max Bearing Speed:5500 rpm; Housing Coating:Powder Coat; Housing Material:Cast Iron; Flinger Material:Steel; Retainer Type:Std Retainer; Seal Type:Single Lip; Base to Center Height:Standard; Anti-Rotation Pin:Yes; Ship Weight:2.7 LB; Bearing Insert Material:Steel; Manufacturing Plant Location:Rogersville, TN;
A8VO200LA1KH1-63R1-NSG05F BOSCH REXROTH A8VO Variable Displacement PumpsBearing Family:Setscrew Ball Bearin; Bearing Outer Ring Material:None; Grease Type:Mobilgrease FM222; Manufacturing Plant Location:Rogersville, TN; Retainer Material:Polymer; Base to Center Height:Not Applicable; Flinger Type:INTERNAL RUBBER LIP; Flinger Material:Stainless Steel; Expansion Type:Non-Expansion; Self Aligning:Self Centering; Ring Size:Standard; Ball Grade:Class 10; Anti-Rotation Pin:Yes;
A8VO55SRH2-60R1-PZG05F BOSCH REXROTH A8VO Variable Displacement PumpsBall Bearing Housing Series:211 Series; Housing Coating:Powder Coat; Bearing Family:Eccentric Collar Bal; d:2.1875 in; Self Aligning:Self Centering; Base to Center Height:Low; Flinger Material:Steel; Shaft Attachment (2):Eccentric Collar; End Cap Groove:Yes; Housing Type:2 Bolt Pillow Block; Ball Material:Steel; Bearing Locking Device:Eccentric Collar; Max Bearing Speed:4000 rpm; Bearing Insert Material:Steel;
A8VO200LA1KH1/63R1-NSG05F00X-S BOSCH REXROTH A8VO Variable Displacement PumpsManufacturing Plant Location:Rogersville, TN; Ball Material:440 STAINLESS STEEL; Seal Type:Triple Lip; Ball Grade:Class 24; Self Aligning:Self Centering; Flinger Type:INTERNAL RUBBER LIP; Bearing Locking Device:Setscrew; Housing Material:Stainless Steel; Base to Center Height:Not Applicable; Bearing Outer Ring Material:Steel; Bearing Bore Shape:Round; Grease Type:Mobilgrease FM222; Max Bearing Speed:3600 rpm;
A8VO80LA1KH1/63R1-NZG05F00X-S BOSCH REXROTH A8VO Variable Displacement PumpsAnti-Rotation Pin:Yes; Seal Type:Single Lip; Manufacturing Plant Location:Rogersville, TN; Expansion Type:Non-Expansion; End Cap Groove:Yes; Ball Bearing Housing Series:209 Series; UPC:782475119325; Bearing Inner Ring Material:Steel; Retainer Material:Nylon; d:1.6875 in; Self Aligning:Self Centering; Base to Center Height:Standard; Ball Material:Steel; Ship Weight:5.39 LB; Max Bearing Speed:5000 rpm;
A8VO200/63R1-NZG05F-S 27031.947 BOSCH REXROTH A8VO Variable Displacement PumpsBall Material:Steel; Flinger Material:None; Expansion Type:Non-Expansion; Anti-Rotation Pin:Yes; Bearing Insert Material:Steel; Self Aligning:Self Centering; Max Bearing Speed:6500 rpm; Bearing Duty:Intermediate Duty; End Cap Groove:No; Bearing Locking Device:Setscrew; Bearing Series:206 Series; Housing Coating:Powder Coat; Seal Type:Single Lip; Housing Type:2 Bolt Pillow Block; Retainer Type:Std Retainer;
A8VO200LA1KH1-63R1-NZG05F024-S BOSCH REXROTH A8VO Variable Displacement PumpsHousing Type:2 Bolt Pillow Block; Ball Grade:Class 10; Ring Size:Standard; Seal Type:Single Lip; UPC:782475881420; Bearing Outer Ring Material:Steel; Flinger Material:Steel; Self Aligning:Yes; Grease Type:Unirex N2; d:1.4375 in; Expansion Type:Non-Expansion; Ship Weight:3.24 LB; Manufacturing Plant Location:Crossville, TN - DC; Shaft Attachment (2):Grip Tight; Bearing Inner Ring Material:Steel; Flinger Type:Rubberized;
A8VO200LA1KH1/63R1-NZN05F00X-S BOSCH REXROTH A8VO Variable Displacement PumpsFlinger Material:Steel; UPC:782476313005; Anti-Rotation Pin:Yes; Expansion Type:Non-Expansion; Ball Material:Steel; Ship Weight:3.827 LB; Shaft Attachment (2):D-Lock; Ball Grade:Class 10; Bearing Insert Material:Steel; Housing Material:Cast Iron; Grease Type:Unirex N2; Bearing Bore Shape:Round; Manufacturing Plant Location:Rogersville, TN; Housing Type:2 Bolt Pillow Block; End Cap Groove:Yes; Flinger Type:Standard;
A8VO200LA1S5/63R1-NZG05F17X-S BOSCH REXROTH A8VO Variable Displacement PumpsSeal Type:Single Lip; UPC:782475816439; Flinger Type:Standard; Base to Center Height:Not Applicable; Bearing Inner Ring Material:Steel; Flinger Material:Steel; Ball Material:Steel; Retainer Material:Nylon; End Cap Groove:No; Ring Size:Standard; Self Aligning:Self Centering; Grease Type:Unirex N2; Max Bearing Speed:3500 rpm; Housing Type:4 Bolt Flange; Housing Coating:Powder Coat; Bearing Duty:Medium Duty;
A8VO80LA1KH1-63R1-NZG05F00X-S BOSCH REXROTH A8VO Variable Displacement PumpsExpansion Type:Expansion; Housing Type:2 Bolt Pillow Block; Bearing Series:115 Series; Seal Type:Triple Lip; Split Housing:SPLIT; Housing Series:115 SERIES (115 C); Housing Product Type:K / DI; Base to Center Hight Numeric:2.8800 in; Setscrew Angle:65; d:1.7500 in; UPC:782475725700; Bearing Bore Shape:Tapered; Grease Type:Mobilgrease XHP222; Bearing Locking Device:Setscrew; Shaft Attachment Type:SETSCREW;
A8VO200LA1KH1/63R1-NZG05F024-S BOSCH REXROTH A8VO Variable Displacement PumpsHousing Material:Cast Iron; d:1.1875 in; Bearing Bore Shape:Round; Ring Size:Standard; Flinger Type:Rubberized; Shaft Attachment (2):Set Screw; UPC:782475863075; Retainer Type:Std Retainer; Base to Center Height:Very High; Housing Type:2 Bolt Pillow Block; Seal Type:Single Lip; Housing Coating:Powder Coat; Retainer Material:Nylon; Bearing Series:206 Series; Bearing Outer Ring Material:Steel; Anti-Rotation Pin:Yes;

 

 

No.BranddUPCSeal TypeRing SizeSeal SizeLiner TypeBall GradeFrame Size
A8VO80LA1H2/63R1-NZG05K07BOSCH REXROTH - 782476184568Triple LipStandard - - - -
A8VO80LA1H2/63R1+A4VG40DE4DT1/32RBOSCH REXROTH - 782475019236 - - - - - 50
A8VO200LA1KH1/63R1-NZG05F00X-SBOSCH REXROTH1.2500 in782475500826Single LipStandard - - Class 10 -
A8VO55LAXHX/61R1-NZG05K020-SBOSCH REXROTH2.4375 in782475055586Piston Ring - - - - -
A8VO200LA1KH2/63R1-NZG05F824-SBOSCH REXROTH30.0000 in782475886173 - Standard - - Class 10 -
A8VO80LA1KH1-63R1-NZG05F004BOSCH REXROTH1.4375 in782475115419Single LipStandard - - Class 10 -
A8VO80LG1DS-60R1-NZG05K01-KBOSCH REXROTH - 782476197209Single LipStandard - - - -
A8VO55LA0K/61R1+AZPNN-11-025BOSCH REXROTH50.0000 mm782475466702Single Lip - - - Class 10 -
A8VO80LA1H2/63R1+A4VG56DE4DT1/32RBOSCH REXROTH - 782476406837 - - - - - -
A8VO200LA1S-63R1-NZG05F174BOSCH REXROTH - 782476477691 - Standard - - - -
A8VO28SR3-60R3-NZG05K02BOSCH REXROTH3.4375 in782475036028Piston Ring - - - - -
A8VO55LA1H2-60R1-NZG05K13BOSCH REXROTH - 782475987054 - Standard - - - -
A8VO80LA1KH1-61R1-NZG05F004BOSCH REXROTH1.9375 in782475921249Single LipStandard - - Class 10 -
A8VO28SR-60R3-NZG05K02BOSCH REXROTH1.0000 in782475581887Triple LipStandard - - - -
A8VO80LA1H2/63R1+A4VG40DE4DT1/32RBOSCH REXROTH - 782475117444Single LipStandard - - - -
A8VO200LA1KH1/63R1-NZG05F02X-SBOSCH REXROTH2.7500 in782475696444Triple Lip - - - - -
A8VO80LA1H2/63R1+A4VG40DE4DT1/32RBOSCH REXROTH1.7500 in782475891009 - Standard - - Class 10 -
A8VO55SR-60R1-PZG05FBOSCH REXROTH - 782475018123 - - - - - -
A8VO80LG2H2/60R1-NZG05K14BOSCH REXROTH - - Single Lip - - - - -
A8VO80LRCH2-60R1-PZG05K02BOSCH REXROTH - 782475863143 - Standard - - Class 10 -
A8VO80LA1KH1-63R1-NZG05F001BOSCH REXROTH35.0000 in782475989522Single LipStandard - - - -
A8VO55LRZ/60R1-PZG05NBOSCH REXROTH50.0000 mm782476483364 - Standard - - Class 10 -
A8VO200LA1S5/63R+A4VG90DWDMT1/32RBOSCH REXROTH - 782475584031 - Standard - - Class 24 -
A8VO55SRC-60R1-NZG05K04-KBOSCH REXROTH - 782475117031Single LipStandard - - - -
A8VO28SR-60R3-PZG05K01BOSCH REXROTH - 782475240876 - Standard - - - -
A8VO200LA1KH1/63R1-XSG05F00X-SBOSCH REXROTH1.0000 in - Single Lip - - - - -
A8VO80LA1KH1/63R1-NZG05F00X-SBOSCH REXROTH - 782476264581 - - - - - 308
A8VO200LA1KH1/63R1-XSG05F000-SBOSCH REXROTH1.6875 in782476268527Single Lip - - - Class 10 -

Variable pumps, open circuit | Bosch Rexroth AG

Axial piston variable double pump · A8VO. For machines with multi-circuit operation such as excavators, cranes, drilling equipment; Size 55 …

Axial piston variable double pump - A8VO - Bosch Rexroth

For machines with multi-circuit operation such as excavators, cranes, drilling equipment; Size 55 … 225; Nominal pressure up to 5500 psi; Maximum pressure ...

Axial Piston Variable Double Pump A8VO

Bosch Rexroth AG. A8VO RE 93010/03.09. Ordering Code / Standard Program. Axial piston unit. 01 Bent-axis design, variable. A8V. Operation mode.40 pages

Axial piston variable double pump | Bosch Rexroth AG

Axial piston variable double pump. A8VO. For machines with multi-circuit operation such as excavators, cranes, drilling equipment; Size 55 …

Variable pumps, open circuit - Mobile hydraulics

Axial piston variable double pump · A8VO. For machines with multi-circuit operation such as excavators, cranes, drilling equipment; Size 55 …

Axial Piston Variable Double Pump A8VO - Bosch Rexroth

The axial piston variable double pump generates, controls and regulates a hydraulic fluid flow. The A8VO is suitable for direct mounting on the flywheel case ...

Axial piston variable double pump A8VO225 Series 72

Bosch Rexroth AG, RE 93013/03.2014. 4. A8VO Series 72 | Axial piston variable double pump. Hydraulic fluids. Hydraulic fluids. The A8VO variable double pump ...

Axial Piston Variable Double Pump A8VO

Assistenza, progettazione impianti oleodinamici. Vendita prodotti per oleodinamica. Rivenditore Bosch Rexroth.

Hydraulic axial piston pump - A8VO - Bosch Rexroth

Find out all of the information about the Bosch Rexroth - Mobile Hydraulics and Electronics product: hydraulic axial piston pump A8VO .

Mobile hydraulics - Axial piston pumps - Bosch Rexroth

Axial piston variable double pump. A8VO. For machines with multi-circuit operation such as excavators, cranes, drilling equipment; Size 55 …

 

A8VO80SR3-60R1-NZG05K04-K BOSCH REXROTH A8VO Variable Displacement Pumps Video

 

BOSCH REXROTH A8VO80SR3-60R1-NZG05K04-K INTERCHANGE

Bosch Rexroth A8vo Variable Displacement Pumps Part series A8VO80SR3-60R1-NZG05K04-K is a potential replacement for these common bearing part numbers:

  • A8VO80SR3-60R1-NZG05K04-K

  • A8VO80SR3-60R1-NZG05K04-K

  • A8VO80SR3-60R1-NZG05K04-K

  • A8VO80SR3-60R1-NZG05K04-K

  • A8VO80SR3-60R1-NZG05K04-K

  • A8VO80SR3-60R1-NZG05K04-K

  • A8VO80SR3-60R1-NZG05K04-K

  • A8VO80SR3-60R1-NZG05K04-K

Contact Us

KAWASAKI K3VL AXIAL PISTON PUMP SUPPLIER
Address
Phone(Working Time)
Fax
  • KAWASAKI K3VL AXIAL PISTON 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 A8VO80SR3-60R1-NZG05K04-K Technical Articles

What are the 2 types of pumps?
Different Functions for Different Types of Pumps - Equipment Jul 1, 2020 — Different Functions for Different Types of Pumps · One may look upon any pump and from the outside, contemplate that only the size of any given  What Are the Differences Between...
What are the advantages and disadvantages of piston pump?
What is a piston pump? its working, types, advantages Sep 24, 2021 — Advantages of Piston Pumps · These pumps have a wide range of pressure. · These have capability to move sludges and high viscosity fluids. · They  Piston Pumps and Plunger Pumps...
What are the four types of pumps?
Different Types of Pumps: Working & Their Applications1). Diaphragm Pumps · 2). Gear Pumps · 3). Peristaltic Pumps · 4). Lobe Pumps · 5). Piston Pumps. Different Types of Pumps - HAOSH PumpMar 14, 2022 — Centrifugal Pumps ; Axial Flow Pump, Also known...

Bosch Rexroth A8vo Variable Displacement Pumps CATEGORIES

  • 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
  • Kawasaki K5v Hydraulic Pump
  • Linde Hpr Hydraulic Pump
More

Customers Who Viewed BOSCH REXROTH A8VO80SR3-60R1-NZG05K04-K Bearing Also Viewed

  • A8VO160LA1H2/60R1-NZG05K82 BOSCH REXROTH A8VO Variable Displacement Pumps
  • A8VO160LA1H1-61R1-NZG05F02 BOSCH REXROTH A8VO Variable Displacement Pumps
  • A8VO160LA1KH1/60R1-NSG05F000-S BOSCH REXROTH A8VO Variable Displacement Pumps
  • A8VO160LA1KH1/60R1-NSG05F000-S BOSCH REXROTH A8VO Variable Displacement Pumps
  • A8VO160LA1DH2-60R1-NZG05K42-S BOSCH REXROTH A8VO Variable Displacement Pumps
 
  • About Us|
  • Contact Us|
  • Site Map
  • Sitemaps

KAWASAKI K3VL AXIAL PISTON PUMP SUPPLIER. Copyright © 2017 - 2024 All Rights Reserved.

  • Home
  • Stock Categories
    • 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
    • Kawasaki K5v Hydraulic Pump
    • Linde Hpr Hydraulic Pump
  • Technical Articles
  • Kawasaki K3vl Axial Piston Pump
  • Kawasaki K3vg Variable Displacement Axial Piston Pump
  • Kawasaki K3v Hydraulic Pump
✖

Home

Stock Categories

Technical Articles

Kawasaki K3vl Axial Piston Pump

Kawasaki K3vg Variable Displacement Axial Piston Pump

Kawasaki K3v Hydraulic Pump

Contact Us