Fujian Zhenyuan Machinery Parts Co., Ltd.
Fujian Zhenyuan Machinery Parts Co., Ltd.
YUKEN Single Vane Pump PV2R Series   YUKEN Double Vane Pump   YUKEN Piston Pump A Series  
English
English
  • Home
  • Stock Categories
    • YUKEN Single Vane Pump PV2R Series
    • YUKEN Double Vane Pump
    • YUKEN Piston Pump A Series
    • YUKEN Solenoid Directional Valve
    • YUKEN Pressure Valve
    • YUKEN Flow Control Valve
    • YUKEN Sandwich Plate Valve
    • FAG Bearing
    • IKO Bearing
    • KOYO Bearing
    • NSK Bearing
    • NTN Bearing
    • SKF Bearing
    • Timken Bearing
    • DODGE Bearing
    • REXROTH HY-CHECK VALVE
    • REXROTH Pressure relief valve
    • REXROTH Directional poppet valves
    • REXROTH Pressure reducing valve
    • REXROTH Check valves
    • REXROTH Throttle check valves
    • REXROTH Throttle check valve
    • REXROTH Directional spool valves
    • REXROTH Valves
    • REXROTH Twin throttle check valve
    • REXROTH Throttle valves
    • M804049 Bearing
    • Timken 3782 Bearing
    • 08125 Bearing
    • Ra012rrb Bearing
    • Super Precision Bearing
    • Super Precision Angular Contact Bearings
    • Large Slewing Bearings
    • Slewing Ring Bearings
    • Kaydon Slewing Bearing
    • Bearing Slewing Ring
    • Super Precision Bearings
  • Technical Articles
  • YUKEN Single Vane Pump PV2R Series
  • YUKEN Double Vane Pump
  • YUKEN Piston Pump A Series
✖

Home

Stock Categories

Technical Articles

YUKEN Single Vane Pump PV2R Series

YUKEN Double Vane Pump

YUKEN Piston Pump A Series

Home>Products>YUKEN Piston Pump A Series>YUKEN A16-F-R-04-C-K-32 Piston Pump A Series

  • YUKEN A16-F-R-04-C-K-32 Piston Pump A Series
  • YUKEN A16-F-R-04-C-K-32 Piston Pump A Series
  • YUKEN A16-F-R-04-C-K-32 Piston Pump A Series
  • YUKEN A16-F-R-04-C-K-32 Piston Pump A Series
  • YUKEN A16-F-R-04-C-K-32 Piston Pump A Series
  • YUKEN A16-F-R-04-C-K-32 Piston Pump A Series

YUKEN A16-F-R-04-C-K-32 MODELS

Need a CAD or 3D Model?

What is A16-F-R-04-C-K-32 bearing cross reference?
Contact NowWhatsAppBe Our Agent

YUKEN A16-F-R-04-C-K-32 Piston Pump A Series

category

YUKEN Piston Pump A Series

YUKEN A16-F-R-04-C-K-32 Bearing SPECIFICATIONS

  • High Quality YUKEN A16-F-R-04-C-K-32 Piston Pump A Series. Competitive Pillow Block Category YUKEN Piston Pump A Series Pricing. Accept Small Fujian Zhenyuan Machinery Parts Co., Ltd. Order. Easy and Fast Shipping.

  • YUKEN
  • A16-F-R-04-C-K-32

  • Pillow Block
  • 0.0
  • N/A
  • 7.718
  • M06288
  • 4
  • Concentric Collar
  • 4 Bolt Pillow Block
Fujian Zhenyuan Machinery Parts Co., Ltd.

Fujian Zhenyuan Machinery Parts Co., Ltd.China

  • Fujian Zhenyuan Machinery Parts 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

The details of YUKEN Piston Pump A Series

  • Pillow Block
  • 0.0
  • N/A
  • 7.718
  • M06288
  • 4
  • Concentric Collar
  • 4 Bolt Pillow Block
  • Spherical Roller Bearing
  • Cast Steel
  • Expansion
  • 5/8 Inch
  • Yes
  • 22213
  • Triple Lip Urethane
  • 1 Piece Solid
  • Inch
  • Double Row | Double Collar | With Set Screw
  • 4 Bolt Pillow Block; 2-7/16" Bore; 2-3/4" Base to Center Height; Concentric Collar Mount; Spherical Roller Bearing; 7-1/8" Minimum Bolt Spacing; 8-3/4" Bolt Spacing Maximum; Relubr
  • 31171511
  • 8483.20.40.80
  • Bearing
  • Pillow Block
  • QAAPR13A207SEO
  • 20
  • 4.3 Inch | 109.22 Millimeter
  • 0 Inch | 0Millimeter
  • 7.9 Inch | 199.5 Millimeter
  • 2.438 Inch | 61.925 Millimeter
  • 2.75 Inch | 69.85 Millimeter
  • 8.75 Inch | 222.25Millimeter
  • 7.125 Inch | 180.975Millimeter

YUKEN A16-F-R-04-C-K-32 YUKEN Piston Pump A Series Cross References

No.BrandBSDTCFar
A56-F-R-01-B-S-K-32YUKEN - - 3.62 Inch | 91.948 Millimeter - - - - -
A37-F-R-01-H-S-K-32YUKEN - - 4.99 Inch | 126.746 Millimeter - - - - -
A56-F-R-01-H-K-32YUKEN - - 3.25 Inch | 82.55 Millimeter - - - - -
A70-L-R-01-K-S-60YUKEN - - 3.37 Inch | 85.598 Millimeter - - - - -
A145-FR04KS-60 YUKEN - - - - - - - -
A56-L-R-01-C-K-32YUKEN3.74 Inch | 95 Millimeter - 4.03 Inch | 102.362 Millimeter - - - - -
A70-L-R-04-H-S-60YUKEN2.756 Inch | 70 Millimeter - 4.3 Inch | 109.22 Millimeter - - - - -
A37-F-R-01-C-S-K-32YUKEN - - 4.531 Inch | 115.087 Millimeter - - - - -
A22-L-R-01-C-S-K-32YUKEN - - 4.59 Inch | 116.586 Millimeter - - - - -
A10-L-R-01-B-K-10YUKEN - - 4.59 Inch | 116.586 Millimeter - - - - -
A37-F-R-01-B-S-K-32YUKEN - - 4.03 Inch | 102.362 Millimeter - - - - -
A22-F-R-01-B-K-32YUKEN4.5 Inch | 114.3 Millimeter - 4.63 Inch | 117.602 Millimeter - - - - -
A90-L-R-01-C-S-60YUKEN - - 6.04 Inch | 153.416 Millimeter - - - - -
A22-F-R-04-B-K-32YUKEN - - 160 mm - - - - -
A22-F-R-04-C-K-32YUKEN34 mm - 180 mm - - - - -
A70-F-R-01-B-S-60YUKEN3.75 Inch | 95.25 Millimeter - 4.03 Inch | 102.362 Millimeter - - - - -
A22-F-R-01-C-K-32YUKEN - - 4.13 Inch | 104.9 Millimeter - - - - -
A56-F-R-04-B-K-A-3266YUKEN35mm - 150mm - - - - -
A16-F-R-04-H-K-32YUKEN - - 2.75 Inch | 69.85 Millimeter - - - - -
A22-F-R-04-C-K-3280YUKEN - - - - - - - -
A70-L-R-04-C-S-K-32YUKEN - - - - - - - -
A100-FR04HS-10YUKEN3 Inch | 76.2 Millimeter - 4.375 Inch | 111.13 Millimeter - - - - -
A37-L-R-01-H-S-K-32YUKEN4.921 Inch | 125 Millimeter - 4.61 Inch | 117.094 Millimeter - - - - -

 

YUKEN A37-F-R-01-B-K-32 Piston Pump A Seriesd:2-1/8 in; cage material:No Cage; D:2-1/2 in; maximum rpm:3100 RPM; B:1 in; precision rating:Not Rated; drawn cup type:Open Ends with Full Complement; series:B; closure type:Open; lubrication hole type:No Hole; dynamic load capacity:13300 lbf; standards met:ANSI/ABMA 18.2, ASTM F2162; static load capacity:33000 lbf; compatible inner ring:IR-3024;
YUKEN A22-L-R-01-B-K-32 Piston Pump A SeriesCategory:Pillow Block; Inventory:0.0; Minimum Buy Quantity:N/A; Weight:32.688; Product Group:M06288; Number of Mounting Holes:4; Mounting Method:Concentric Collar; Housing Style:4 Bolt Pillow Block; Rolling Element:Spherical Roller Bearing; Housing Material:Cast Steel; Expansion / Non-expansion:Expansion; Mounting Bolts:3/4 Inch; Relubricatable:Yes; Insert Part Number:22222; Seals:Triple Lip Urethane;
YUKEN A56-F-R-01-B-S-K-32 Piston Pump A SeriesCategory:Flange Block; Inventory:0.0; Minimum Buy Quantity:N/A; Weight:9.988; Product Group:M06288; Number of Mounting Holes:4; Mounting Method:Eccentric Collar; Housing Style:4 Bolt Round Flange Cartridge; Rolling Element:Spherical Roller Bearing; Housing Material:Cast Steel; Expansion / Non-expansion:Expansion; Mounting Bolts:5/8 Inch; Relubricatable:Yes; Insert Part Number:22215; Seals:Triple Lip Urethane;
YUKEN A22-F-R-01-H-K-32 Piston Pump A SeriesCategory:Pillow Block; Inventory:0.0; Minimum Buy Quantity:N/A; Weight:56.296; Product Group:M06288; Number of Mounting Holes:4; Mounting Method:Concentric Collar; Housing Style:4 Bolt Pillow Block; Rolling Element:Spherical Roller Bearing; Housing Material:Cast Steel; Expansion / Non-expansion:Non-expansion; Mounting Bolts:7/8 Inch; Relubricatable:Yes; Insert Part Number:22226; Seals:Triple Lip Urethane;
YUKEN A56-F-R-04-H-K-32393 Piston Pump A SeriesBearing number:6310-2RS; Size (mm):50x110x27; Bore Diameter (mm):50; Outer Diameter (mm):110; Width (mm):27; d:50 mm; D:110 mm; B:27 mm; C:27 mm;
YUKEN A70-L-R-04-H-A-S-A-60366 Piston Pump A SeriesCategory:Flange Block; Inventory:0.0; Minimum Buy Quantity:N/A; Weight:19.522; Product Group:M06288; Number of Mounting Holes:4; Mounting Method:Eccentric Collar; Housing Style:4 Bolt Round Flange Cartridge; Rolling Element:Spherical Roller Bearing; Housing Material:Cast Steel; Expansion / Non-expansion:Expansion; Mounting Bolts:3/4 Inch; Relubricatable:Yes; Insert Part Number:22220; Seals:Triple Lip Urethane;
YUKEN A90-L-R-01-C-S-60 Piston Pump A SeriesCategory:Flange Block; Inventory:0.0; Minimum Buy Quantity:N/A; Weight:46.308; Product Group:M06288; Number of Mounting Holes:6; Mounting Method:Eccentric Collar; Housing Style:6 Bolt Round Flange Cartridge; Rolling Element:Spherical Roller Bearing; Housing Material:Cast Steel; Expansion / Non-expansion:Expansion; Mounting Bolts:7/8 Inch; Relubricatable:Yes; Insert Part Number:22226; Seals:Double Lip Nitrile Rubber;
YUKEN A37-F-R-01-C-S-K-32 Piston Pump A SeriesCategory:Single Row Ball Bearing; Inventory:0.0; Minimum Buy Quantity:N/A; Weight:0.219; Product Group:B00308; Enclosure:1 Metal Shield; Precision Class:ABEC 1 | ISO P0; Maximum Capacity / Filling Slot:No; Rolling Element:Ball Bearing; Snap Ring:No; Internal Special Features:No; Cage Material:Steel; Internal Clearance:C3-Loose; Inch - Metric:Metric; Long Description:30MM Bore; 62MM Outside Diameter; 16MM Outer Race Diameter; 1 Metal Shield; Ball Bearing; ABEC 1 | ISO P0; No Filling Slot; No Snap Ring; No Internal Special Features;
YUKEN A145-F-R-04-K-S-K-32 Piston Pump A SeriesCategory:Sleeve Bearings; Inventory:156.0; Minimum Buy Quantity:N/A; Weight:0.001; Product Group:B04264; Profile:Bushing No Flange; Material Description:Oil Impregnated Sintered Bronze; Material:SAE841; Inch - Metric:Inch; Long Description:5/16" Nominal Bore; 1/2" Nominal Outside Diameter; 3/4" Length Thru Bore; Bushing No Flange Profile; Oil Impregnated Sintered Bronze; SAE841 Material; 0.315" Bore;
YUKEN A56-L-R-01-H-K-32 Piston Pump A Seriesmounting:Two-Bolt Base; overall height:4.9063 in; d:2.0000 in; base width:2.3125 in; bore type:Round; D:6.9063 in; base to bore centerline:2.4375 in; bolt size:5/8 in; duty type:Normal Duty; lubrication type:Lubrication Fitting; housing material:Cast Iron; series:HCLP; locking device:Eccentric Collar; replacement bearing:HC211-32; seal type:R-Seal; manufacturer catalog:Click here; expansion type:Non-Expansion Bearing (Fixed);
YUKEN A70-F-R-01-B-S-60 Piston Pump A SeriesCategory:Pillow Block; Inventory:0.0; Minimum Buy Quantity:N/A; Weight:19.522; Product Group:M06288; Number of Mounting Holes:4; Mounting Method:Concentric Collar; Housing Style:4 Bolt Pillow Block; Rolling Element:Spherical Roller Bearing; Housing Material:Cast Steel; Expansion / Non-expansion:Non-expansion; Mounting Bolts:3/4 Inch; Relubricatable:Yes; Insert Part Number:22218; Seals:Triple Lip Urethane;
YUKEN A90-F-R-04-H-K-3266 Piston Pump A SeriesBearing number:RNU8102; Size (mm):405x730x195; Bore Diameter (mm):405,000; Outer Diameter (mm):730,000; Width (mm):195,000; d:405,000 mm; D:730,000 mm; B:195,000 mm; C:195,000 mm;
YUKEN A10-L-R-01-B-K-10 Piston Pump A SeriesCategory:Flange Block; Inventory:0.0; Minimum Buy Quantity:N/A; Weight:19.522; Product Group:M06288; Number of Mounting Holes:4; Mounting Method:Eccentric Collar; Housing Style:4 Bolt Round Flange Cartridge; Rolling Element:Spherical Roller Bearing; Housing Material:Cast Steel; Expansion / Non-expansion:Non-expansion; Mounting Bolts:3/4 Inch; Relubricatable:Yes; Insert Part Number:22220; Seals:Triple Lip Nitrile Rubber;
YUKEN A37-L-R-01-C-K-32 Piston Pump A SeriesCategory:Pillow Block; Inventory:0.0; Minimum Buy Quantity:N/A; Weight:19.522; Product Group:M06288; Number of Mounting Holes:4; Mounting Method:Concentric Collar; Housing Style:4 Bolt Pillow Block; Rolling Element:Spherical Roller Bearing; Housing Material:Cast Steel; Expansion / Non-expansion:Expansion; Mounting Bolts:3/4 Inch; Relubricatable:Yes; Insert Part Number:22218; Seals:Teflon Labyrinth;
YUKEN A16-L-R-01-H-K-32 Piston Pump A SeriesCategory:Take Up Units; Inventory:0.0; Minimum Buy Quantity:N/A; Weight:10.442; Product Group:M06288; Component Description:Take Up Bearing Only; Rolling Element:Spherical Roller Bearing; Housing Style:Unit Only; Mounting Method:Concentric Collar; Compatible Take Up Frame:QMTF; Adjustment Travel Length:0; Insert Part Number:22213; Housing Material:Cast Steel; Other Features:Double Row | Non-expansion | Three Lip Urethane Seal | Steel Cage | With Set Screw;
YUKEN A37-F-R-04-H-K-A-32366 Piston Pump A SeriesCategory:Flange Block; Inventory:0.0; Minimum Buy Quantity:N/A; Weight:52.21; Product Group:M06288; Number of Mounting Holes:6; Mounting Method:Eccentric Collar; Housing Style:6 Bolt Round Flange Block; Rolling Element:Spherical Roller Bearing; Housing Material:Cast Steel; Expansion / Non-expansion:Expansion; Mounting Bolts:1-1/8 Inch; Relubricatable:Yes; Insert Part Number:22226; Seals:Teflon Labyrinth;

 

 

YUKEN A16-F-R-04-C-K-32 Piston Pump A Series Video

 

A Series Variable Displacement Piston Pumps

Dec 3, 2016 — A. Series Variable Displacement Piston Pumps. A10. A16. A22. A37. A45 ... ☆2 The maximum operating pressure for each double pump depends on its combination of ... multistage pressure control valve. 61. "04". Proportional. Electro- ... YUKEN. DEC. Flow Adj. Screw. 17 Hex. Discharge Port. 32 Dia. 30.2

Yuken A16-F-R-01-H-K-32 Variable Displacement

Yuken A16-F-R-01-H-K-32 Variable Displacement Piston Pump ... A145-F-R-01-B-S-60, A37-L-R-01-C-K-32 ... A145-FR04HBS-A-60366, A40-F-R-01-C-K-32

piston pumps - YUKEN Hydraulic Equipment

and temperature range is from 0 to 60°C (32 to 140°F), ... cm /rev (cu.in./rev). Control Type. 01. 02. 03. 04. 04E. 05. 06. 07. 09. A10. A16. A22 ... Yuken for details

A Series Variable Displacement Piston Pumps

Dec 3, 2016 — A. Series Variable Displacement Piston Pumps. A10. A16. A22. A37. A45. A56 ... Geometric. Displacement cm3/rev. Control Type. 01. 02. 03. 04. 04E ... YUKEN. DEC. Flow Adj. Screw. 17 Hex. Discharge Port. 32 Dia. 30.2. 24

Yuken piston pumps A series, AR series, A3H series, ARL1

Information on Yuken variable displacement piston pumps such as AR series, A series, A3H ... A16-F-L-01-C-K-3290; A16-F-L-01-H-K-32950; A16-F-R-01-B-K-32 ... A16-F-R-02-K-D24-32; A16-F-R-02-S-K-A120-32950; A16-F-R-04-H-K-3290 

YUKEN Hydraulic Equipment - Royal Hydraulics

have been developed by Yuken's leading hydraulic engineers and provide a diverse lineup to meet a ... below, the AR16 is smaller than the A16 (32 design). ... cm /rev (cu.in./rev). Control Type. 01. 02. 03. 04. 04E. 05. 06. 07. 09. A10. A16

Houston Hydraulic > Yuken > Piston Pumps > Axial Pistion

A16-F-L-01-C-K-32. Piston Pump, Pressure Comp 170 ... A16-F-R-01-C-K-32. Piston Pump, Pressure Comp ... A16-F-R-04-H-K-3290. Piston Pump, Proportional 

YUKEN A16-F-R-04-C-K-32 INTERCHANGE

YUKEN Piston Pump A Series Part series A16-F-R-04-C-K-32 is a potential replacement for these common bearing part numbers:

  • A16-F-R-04-C-K-32

  • A16-F-R-04-C-K-32

  • A16-F-R-04-C-K-32

  • A16-F-R-04-C-K-32

  • A16-F-R-04-C-K-32

  • A16-F-R-04-C-K-32

  • A16-F-R-04-C-K-32

  • A16-F-R-04-C-K-32

Contact Us

Fujian Zhenyuan Machinery Parts Co., Ltd.
AddressFengze District, Quanzhou City, Fujian Province
Phone(Working Time)86-15125978866
Fax
  • Fujian Zhenyuan Machinery Parts 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

YUKEN A16-F-R-04-C-K-32 Technical Articles

Can you drive with a bad clutch release bearing?
4 Symptoms of a Bad Clutch Release Bearing andNov 7, 2019 — That way, you can make engine turns no matter what speed you're going. If you have a bad clutch release bearing, then there will be some obvious Your vehicle will be virtually...
How do you change a bearing in a pillow block?
5 Things to Remember When Installing Pillow Block BearingsJul 1, 2016 — Should I also replace the housing when changing the pillow block bearing? It is recommended that you change out the entire unit. Since the  What If There Was An...
How long do pilot bearings last?
Pilot Bearing/Throw-out Bearing: How long until failure? - MXDec 15, 2015 — Pretty sure it's the pilot bearing. Does anyone know how long I might be able to milk something like this? It will last as long as it lasts Pilot Bearing, Bushing...

YUKEN Piston Pump A Series CATEGORIES

  • YUKEN Single Vane Pump PV2R Series
  • YUKEN Double Vane Pump
  • YUKEN Piston Pump A Series
  • YUKEN Solenoid Directional Valve
  • YUKEN Pressure Valve
  • YUKEN Flow Control Valve
  • YUKEN Sandwich Plate Valve
  • FAG Bearing
  • IKO Bearing
  • KOYO Bearing
  • NSK Bearing
  • NTN Bearing
  • SKF Bearing
  • Timken Bearing
  • DODGE Bearing
  • REXROTH HY-CHECK VALVE
  • REXROTH Pressure relief valve
  • REXROTH Directional poppet valves
  • REXROTH Pressure reducing valve
  • REXROTH Check valves
  • REXROTH Throttle check valves
  • REXROTH Throttle check valve
  • REXROTH Directional spool valves
  • REXROTH Valves
  • REXROTH Twin throttle check valve
  • REXROTH Throttle valves
  • M804049 Bearing
  • Timken 3782 Bearing
  • 08125 Bearing
  • Ra012rrb Bearing
  • Super Precision Bearing
  • Super Precision Angular Contact Bearings
  • Large Slewing Bearings
  • Slewing Ring Bearings
  • Kaydon Slewing Bearing
  • Bearing Slewing Ring
  • Super Precision Bearings
More

Customers Who Viewed YUKEN A16-F-R-04-C-K-32 Bearing Also Viewed

  • YUKEN A22-F-R-04-B-K-3290 Piston Pump A Series
  • YUKEN A37-F-R-04-H-K-A-32366 Piston Pump A Series
  • YUKEN A22-F-R-04-B-K-32 Piston Pump A Series
  • YUKEN A16-F-R-04-C-K-32 Piston Pump A Series
  • YUKEN A145-F-R-01-B-S-60 Piston Pump A Series

Top Products

SKF 6004/VA232 Single Row Ball Bearings IKO CF30BR Cam Follower and Track Roller - Stud Type YUKEN DSHG-10 Pressure Valve
YUKEN PV2R34-94-184F-RAAA-31 Double Vane Pump Timken 14125a Bearing
 
  • About Us|
  • Contact Us|
  • Site Map
  • Sitemaps

Fujian Zhenyuan Machinery Parts Co., Ltd.. Copyright © 2017 - 2023 All Rights Reserved.

  • Home
  • Stock Categories
    • YUKEN Single Vane Pump PV2R Series
    • YUKEN Double Vane Pump
    • YUKEN Piston Pump A Series
    • YUKEN Solenoid Directional Valve
    • YUKEN Pressure Valve
    • YUKEN Flow Control Valve
    • YUKEN Sandwich Plate Valve
    • FAG Bearing
    • IKO Bearing
    • KOYO Bearing
    • NSK Bearing
    • NTN Bearing
    • SKF Bearing
    • Timken Bearing
    • DODGE Bearing
    • REXROTH HY-CHECK VALVE
    • REXROTH Pressure relief valve
    • REXROTH Directional poppet valves
    • REXROTH Pressure reducing valve
    • REXROTH Check valves
    • REXROTH Throttle check valves
    • REXROTH Throttle check valve
    • REXROTH Directional spool valves
    • REXROTH Valves
    • REXROTH Twin throttle check valve
    • REXROTH Throttle valves
    • M804049 Bearing
    • Timken 3782 Bearing
    • 08125 Bearing
    • Ra012rrb Bearing
    • Super Precision Bearing
    • Super Precision Angular Contact Bearings
    • Large Slewing Bearings
    • Slewing Ring Bearings
    • Kaydon Slewing Bearing
    • Bearing Slewing Ring
    • Super Precision Bearings
  • Technical Articles
  • YUKEN Single Vane Pump PV2R Series
  • YUKEN Double Vane Pump
  • YUKEN Piston Pump A Series
✖

Home

Stock Categories

Technical Articles

YUKEN Single Vane Pump PV2R Series

YUKEN Double Vane Pump

YUKEN Piston Pump A Series

Contact Us