Basic Info.
Model NO.
310/600X2 310/630X2
Bearings Quality
P0 P2 P4 P5 P6
Feature
Long Life&High Speed&Low Noise&High Precision
Company Nature
Manufacturer
Transport Time
3-7 Days(Depend on Customer Need)
Mode of Transport
Sea/Air/Train Transport
Rolling Body
Roller Bearings
The Number of Rows
Single
Outer Dimension
Medium and Large(120-190mm)
Spherical
Non-Aligning Bearings
Load Direction
Radial Bearing
Trademark
NSK TIMKEN NTN KOYO NACHI
Transport Package
Carton/Pallet/Box/Bay/Plastic
Specification
Standard Size
Origin
Germany Japan American
Product Description
Tapered roller bearings are separable bearings. Both the inner and outer rings of the bearing have tapered raceways. This type of bearing is divided into single-row, double-row and four-row tapered roller bearings according to the number of rows installed. Single row tapered roller bearings can bear radial load and single direction axial load. When the bearing bears radial load, it will produce an axial component force, so another bearing that can bear the axial force in the opposite direction is needed to balance it. Tapered roller bearings are widely used in industries such as automobiles, rolling mills, mining, metallurgy, and plastic machinery.
new model | old model | innter diameter | outside diameter | high | (kN) | (r/min) | weight |
30203 | 7203E | 17 | 40 | 12 | 20.8 | 9000 | 0.079 |
30203X2 | 7203 | 17 | 40 | 13.5 | - | - | 0.074 |
30203JR | - | 17 | 40 | 12 | 20.8 | 10000 | 0.081 |
30205 | 7205E | 25 | 52 | 15 | 32.2 | 7000 | 0.154 |
30205X2 | 7205 | 25 | 52 | 16.5 | - | - | 0.15 |
30205 J2/Q | 7205 | 25 | 52 | 16.25 | - | - | 0.15 |
30205XR | - | 25 | 52 | 15 | 30.4 | 7900 | 0.155 |
30205JR | - | 25 | 52 | 15 | 31.5 | 7800 | 0.156 |
30207 | 7207E | 35 | 72 | 17 | 54.2 | 5300 | 0.331 |
30207/YB2 | - | 35 | 72 | 18.25 | - | - | 0.333 |
57305/30207J | - | 35 | 72 | 18.25 | - | - | 0.333 |
30207 J2/Q | 7207 | 35 | 72 | 18.25 | - | - | 0.32 |
30207CR | - | 35 | 72 | 17 | 52.9 | 5700 | 0.35 |
30207JR | - | 35 | 72 | 17 | 55.1 | 5600 | 0.344 |
30209 | 7209E | 45 | 85 | 19 | 67.8 | 4500 | 0.474 |
30209X3 | - | 45 | 90 | 38.5 | - | - | 0.846 |
30209/HP | 7209PN | 45 | 85 | 20.75 | - | - | 0.475 |
46T30209J/37.5 | - | 45 | 85 | 47 | 105 | 3700 | 1.13 |
30209XR | - | 45 | 85 | 19 | 69.4 | 4600 | 0.5 |
30209JR | - | 45 | 85 | 19 | 67.2 | 4600 | 0.502 |
30213 | 7213E | 65 | 120 | 23 | 120 | 3200 | 1.13 |
46T30213J46.5 | - | 65 | 120 | 56 | 202 | 2600 | 2.63 |
30213CR | - | 65 | 120 | 23 | 116 | 3200 | 1.15 |
30213JR | - | 65 | 120 | 23 | 128 | 3200 | 1.18 |
30215 | 7215E | 75 | 130 | 25 | 138 | 2800 | 1.36 |
30215/S0 | 7215ET | 75 | 130 | 27.25 | - | - | 1.4 |
30215X2 | 7215E | 75 | 130 | 27.3 | - | - | 1.36 |
46T30215J/51.5 | - | 75 | 130 | 62 | 225 | 2300 | 3.23 |
30215CR | - | 75 | 130 | 25 | 136 | 2900 | 1.4 |
30215JR | - | 75 | 130 | 25 | 142 | 2900 | 1.42 |
30217 | 7217E | 85 | 150 | 31 | 178 | 2400 | 2.06 |
46T30217J/57 | - | 85 | 150 | 70 | 289 | 2000 | 4.94 |
30217JR | - | 85 | 150 | 28 | 182 | 2500 | 2.17 |
30219 | 7219E | 95 | 170 | 32 | 228 | 2000 | 3.04 |
30219X2/HV | 7219X | 95 | 170 | 35 | - | - | 3.17 |
46T30219J/63 | - | 95 | 170 | 78 | 366 | 1800 | 7.17 |
30219JR | - | 95 | 170 | 32 | 231 | 2200 | 3.2 |
30221 | 7221E | 105 | 190 | 36 | 285 | 1800 | 4.38 |
46T30221J/70 | - | 105 | 190 | 88 | 456 | 1600 | 10.2 |
30221JR | - | 105 | 190 | 36 | 288 | 2000 | 4.49 |
30303 | 7303E | 17 | 47 | 14 | 28.2 | 8500 | 0.129 |
30303JR | - | 17 | 47 | 14 | 27.4 | 9200 | 0.133 |
30303R | - | 17 | 47 | 14 | 27.4 | 9200 | 0.127 |
30305 | 7305E | 25 | 62 | 17 | 46.8 | 6300 | 0.263 |
953566/3030517 | - | 21 | 62 | 18.5 | - | - | 0.273 |
30305X2B | - | 25 | 62 | 18.25 | - | - | 0.22 |
46T30305DJ/29.5 | - | 25 | 62 | 40 | 61.3 | 4500 | 0.595 |
30305DJR | - | 25 | 62 | 17 | 39.8 | 5700 | 0.269 |
30305JR | - | 25 | 62 | 17 | 48.2 | 6800 | 0.237 |
30307 | 7307E | 35 | 80 | 21 | 75.2 | 5000 | 0.515 |
30307B | - | 35 | 80 | 22.75 | - | - | 0.425 |
46T30307DJ/35.5 | - | 35 | 80 | 51 | 92.6 | 3400 | 1.22 |
30307DJR | - | 35 | 80 | 21 | 63.1 | 4300 | 0.536 |
30307XR | - | 35 | 80 | 21 | 69.8 | 5200 | 0.56 |
30307JR-1 | - | 35 | 80 | 21 | 76.2 | 5200 | 0.527 |
30309 | 7309E | 45 | 100 | 25 | 108 | 4000 | 0.984 |
30309X2B | 27709E | 45 | 100 | 32 | - | - | 1.04 |
46T30309DJ/41.5 | - | 45 | 100 | 60 | 140 | 2700 | 2.21 |
46T30309J/49.5 | - | 45 | 100 | 60 | 166 | 3300 | 2.21 |
30309DJR | - | 45 | 100 | 25 | 95.1 | 3400 | 0.973 |
30309CR | - | 45 | 100 | 25 | 109 | 4100 | 1 |
30309JR | - | 45 | 100 | 25 | 113 | 4100 | 1.01 |
30311 | 7311E | 55 | 120 | 29 | 152 | 3400 | 1.63 |
30311X3B | 27711E | 55 | 125 | 37 | - | - | 0 |
46T30311DJ/49 | - | 55 | 120 | 70 | 189 | 2300 | 3.68 |
46T30311J/57 | - | 55 | 120 | 70 | 219 | 2700 | 3.68 |
30311DJR | - | 55 | 120 | 29 | 129 | 2900 | 1.59 |
30311CR | - | 55 | 120 | 29 | 144 | 3400 | 1.58 |
30311JR | - | 55 | 120 | 29 | 149 | 3300 | 1.65 |
30313 | 7313E | 65 | 140 | 33 | 195 | 2800 | 2.44 |
46T30313DJ/53 | - | 65 | 140 | 79 | 273 | 1900 | 5.62 |
46T30313J/63 | - | 65 | 140 | 79 | 316 | 2300 | 5.62 |
30313DJR | - | 65 | 140 | 36 | 176 | 2400 | 2.44 |
30313CR | - | 65 | 140 | 36 | 193 | 2900 | 2.44 |
30313JR | - | 65 | 140 | 36 | 204 | 2800 | 2.56 |
30315 | 7315E | 75 | 160 | 37 | 252 | 2400 | 3.57 |
46T30315J/69 | - | 75 | 160 | 87 | 403 | 2000 | 8.04 |
30315DJR | - | 75 | 160 | 40 | 213 | 2100 | 3.45 |
30315DR | - | 75 | 160 | 37 | 222 | 2100 | 3.48 |
30315CR | - | 75 | 160 | 37 | 248 | 2500 | 3.8 |
30315JR | - | 75 | 160 | 37 | 260 | 2500 | 3.65 |
30315R | - | 75 | 160 | 37 | 251 | 2500 | 3.52 |
30317 | 7317E | 85 | 180 | 41 | 305 | 2000 | 4.96 |
46T30317J/77 | - | 85 | 180 | 98 | 491 | 1700 | 11.4 |
30317D | - | 85 | 180 | 41 | 231 | 1900 | 4.54 |
30317DJR | - | 85 | 180 | 41 | 263 | 1900 | 4.81 |
30317JR | - | 85 | 180 | 41 | 316 | 2200 | 5.15 |
30317R | - | 85 | 180 | 41 | 305 | 2200 | 4.97 |
30319 | 7319E | 95 | 200 | 45 | 317 | 2000 | 6.32 |
46T30319J/85 | - | 95 | 200 | 108 | 577 | 1600 | 15.5 |
30319DJR | - | 95 | 200 | 45 | 319 | 1700 | 6.68 |
30319DR | - | 95 | 200 | 45 | 317 | 1700 | 6.84 |
30319JR | - | 95 | 200 | 45 | 372 | 1000 | 6.96 |
30319JR | - | 95 | 200 | 45 | 372 | 1000 | 6.96 |
30321 | 7321E | 105 | 225 | 49 | 371 | 1700 | 8.74 |
46T30321J/91 | - | 105 | 225 | 116 | 720 | 1400 | 21.2 |
30321D | - | 105 | 225 | 49 | 339 | 1400 | 8.76 |
30321JR | - | 105 | 225 | 49 | 464 | 1700 | 9.73 |
32207 | 7507E | 35 | 72 | 23 | 70.5 | 5300 | 0.445 |
32207-1R | - | 35 | 72 | 23 | 69 | 5700 | 0.465 |
32207JR | - | 35 | 72 | 23 | 69.6 | 5600 | 0.453 |
32209 | 7509E | 45 | 85 | 23 | 80.8 | 4500 | 0.573 |
32209R | 67509 | 45 | 85 | 24.75 | - | - | 0.606 |
32209X2B | 27509E | 45 | 85 | 25 | - | - | 0.584 |
46T32209J/43.5 | - | 45 | 85 | 55 | 123 | 3700 | 1.32 |
32209CR | - | 45 | 85 | 23 | 80.7 | 4600 | 0.625 |
32209JR-1 | - | 45 | 85 | 23 | 84.2 | 4600 | 0.597 |
32211 | 7511E | 55 | 100 | 25 | 108 | 3800 | 0.853 |
46T32211J/48.5 | - | 55 | 100 | 60 | 162 | 3100 | 1.94 |
32211CR | - | 55 | 100 | 25 | 107 | 3900 | 0.875 |
32211JR-1 | - | 55 | 100 | 25 | 107 | 3900 | 0.863 |
32213 | 7513E | 65 | 120 | 31 | 160 | 3200 | 1.55 |
32213/Z1 | 7513Z1 | - | - | - | - | - | - |
32213X2 | 7513 | 65 | 110 | 33 | - | - | 1.5 |
46T32213J/61.5 | - | 65 | 120 | 73 | 237 | 2600 | 3.43 |
32213CR | - | 65 | 120 | 31 | 151 | 3200 | 1.55 |
32213JR | - | 65 | 120 | 31 | 157 | 3200 | 1.58 |
32215 | 7515E | 75 | 130 | 31 | 170 | 2800 | 1.74 |
32215R | 67515 | 75 | 130 | 33.5 | - | - | 14.8 |
32215X2 | 7515 | 75 | 130 | 34 | - | - | 1.68 |
46T32215J/61.5 | - | 75 | 130 | 74 | 275 | 2300 | 3.86 |
32215CR | - | 75 | 130 | 31 | 163 | 2900 | 1.75 |
32215JR | - | 75 | 130 | 31 | 174 | 2900 | 1.77 |
32217 | 7517E | 85 | 150 | 36 | 228 | 2400 | 2.68 |
46T32217J/69 | - | 85 | 150 | 86 | 368 | 2000 | 6.07 |
32217JR | - | 85 | 150 | 36 | 232 | 2500 | 2.8 |
32219 | 7519E | 95 | 170 | 43 | 302 | 2000 | 4.24 |
46T32219J/83 | - | 95 | 170 | 100 | 493 | 1800 | 9.19 |
32219JR | - | 95 | 170 | 43 | 311 | 2200 | 4.34 |
32221 | 7521E | 105 | 190 | 50 | 380 | 1800 | 6.26 |
46T32221J/95 | - | 105 | 190 | 115 | 620 | 1600 | 13.3 |
32221JR | - | 105 | 190 | 50 | 392 | 2000 | 6.37 |
32305 | 7605E | 25 | 62 | 24 | 61.5 | 6300 | 0.368 |
32305XR | - | 25 | 62 | 24 | 57.2 | 7000 | 0.39 |
32305JR | - | 25 | 62 | 24 | 61.2 | 6900 | 0.386 |
32307 | 7607E | 35 | 80 | 31 | 99 | 5000 | 0.763 |
32307JR | - | 35 | 80 | 31 | 101 | 5300 | 0.776 |
32309 | 7609E | 45 | 100 | 36 | 145 | 4000 | 1.4 |
32309BR | - | 45 | 100 | 38.25 | - | - | 1.499 |
32309CR | - | 45 | 100 | 36 | 145 | 4200 | 1.45 |
32309JR | - | 45 | 100 | 38.25 | 146 | 4100 | 1.43 |
32311 | 7611E | 55 | 120 | 43 | 202 | 3400 | 2.37 |
32311/YB2 | 7611EK | 55 | 120 | 45.5 | - | - | 2.355 |
32311BRJ | - | 55 | 120 | 127 | - | - | 2.5 |
32311/YA | 7611EK | 55 | 120 | 45.5 | - | - | 2.43 |
46T32311J/76 | - | 55 | 120 | 97 | 293 | 2700 | 5.1 |
32311C | - | 55 | 120 | 43 | 184 | 3400 | 2.45 |
32311J | - | 55 | 120 | 43 | 171 | 3400 | 2.24 |
32311JR | - | 55 | 120 | 43 | 200 | 3400 | 2.38 |
32313 | 7613E | 65 | 140 | 48 | 260 | 2800 | 3.51 |
46T32313J/84 | - | 65 | 140 | 108 | 429 | 2300 | 7.68 |
32313CR | - | 65 | 140 | 48 | 258 | 2900 | 3.85 |
32313J | - | 65 | 140 | 48 | 250 | 2900 | 3.49 |
32313JR | - | 65 | 140 | 48 | 276 | 2900 | 3.64 |
32315 | 7615E | 75 | 160 | 55 | 348 | 2400 | 5.37 |
46T32315J/99 | - | 75 | 160 | 125 | 563 | 2000 | 11.5 |
32315CR | - | 75 | 160 | 55 | 357 | 2500 | 5.5 |
32315JR | - | 75 | 160 | 55 | 363 | 2500 | 5.41 |
32315R | - | 75 | 160 | 55 | 340 | 2500 | 5.3 |
32317 | 7617E | 85 | 180 | 60 | 422 | 2000 | 7.31 |
46T32317J/108 | - | 85 | 180 | 137 | 680 | 1800 | 15.9 |
32317JR | - | 85 | 180 | 60 | 439 | 2200 | 7.42 |
32319 | 7619E | 95 | 200 | 67 | 427 | 2000 | 9.35 |
46T32319J/118 | - | 95 | 200 | 151 | 801 | 1600 | 21.6 |
32319JR | - | 95 | 200 | 67 | 517 | 2000 | 10.1 |
32321 | 7621E | 105 | 225 | 77 | 543 | 1800 | 13.9 |
32321X3 | - | 105 | 215 | 78 | - | - | 12.6 |
46T32321J/113 | - | 105 | 225 | 170 | 977 | 1400 | 31.1 |
32321JR | - | 105 | 225 | 77 | 635 | 1800 | 14.9 |
30615 | 7815E | 75 | 135 | 44.5 | - | - | 2.57 |
30615/YB2 | 7815 | 75 | 135 | 44 | - | - | 2.6 |
30615/YA | 7815EK | 75 | 135 | 44 | - | - | 2.66 |
30615/HC | 7815EK | 75 | 135 | 44 | - | - | 2.65 |
31311 | 27311E | 55 | 120 | 29 | 130 | 3400 | 1.56 |
31311/YB2 | 27311EK | 55 | 120 | 31.5 | - | - | 1.55 |
31311/YA | 27311EK | 55 | 120 | 31.5 | - | - | 0 |
31313 | 27313E | 65 | 140 | 33 | 165 | 2800 | 2.37 |
31313/YB2 | 27313EK | 65 | 140 | 36 | - | - | 2.39 |
31313/S0 | 27313ET | 65 | 140 | 36 | - | - | 2.46 |
32005 | 2007105E | 25 | 47 | 15 | 28 | 7500 | 0.11 |
32005YA | 2007105EK | 25 | 47 | 15 | - | - | 0.11 |
32005JR | - | 25 | 47 | 15 | 30.2 | 8300 | 0.118 |
32007X2 | 2007117E | 35 | 62 | 17 | 33.8 | 5600 | 0.21 |
32007 | 2007107E | 35 | 62 | 18 | 43.2 | 5600 | 0.224 |
32007X1/YB | 7707EY | 35 | 65 | 18 | - | - | 0.251 |
32007X1 | 7707E | 35 | 65 | 18 | - | - | 0.229 |
32007JR | - | 35 | 62 | 18 | 45.5 | 6200 | 0.231 |
32009X2 | 2007109X | 45 | 75 | 19 | 44.5 | 5000 | 0.32 |
32009 | 2007109E | 45 | 75 | 20 | 58.5 | 5000 | 0.337 |
32009JR | - | 45 | 75 | 20 | 62.8 | 5000 | 0.354 |
32011X2 | - | 55 | 90 | 22 | 63.8 | 4000 | 0.53 |
32011 | 2007111E | 55 | 90 | 23 | 80.2 | 4000 | 0.551 |
32011JR | - | 55 | 90 | 23 | 84.6 | 4100 | 0.569 |
32013X2 | 2007113 | 65 | 100 | 22 | 67 | 3600 | 0.63 |
32013 | 2007113E | 65 | 100 | 23 | 82.8 | 3600 | 0.62 |
32013JR | - | 65 | 100 | 23 | 90 | 3600 | 0.664 |
32015X2 | - | 75 | 115 | 24 | 85.2 | 3200 | 0.88 |
32015 | 2007115E | 75 | 115 | 25 | 102 | 3200 | 0.875 |
32015X2/HV | 2007115X | 75 | 115 | 25.3 | - | - | 0.867 |
32015JR | - | 75 | 115 | 25 | 110 | 3100 | 0.93 |
32017X2 | - | 85 | 130 | 27 | 105 | 2800 | 1.25 |
32017 | 2007117E | 85 | 130 | 29 | 140 | 2800 | 1.32 |
32017JR | - | 85 | 130 | 29 | 150 | 2800 | 1.38 |
32019X2 | - | 95 | 145 | 30 | 122 | 2400 | 1.7 |
32019 | 2007119E | 95 | 145 | 32 | - | - | 1.84 |
32019JR | - | 95 | 145 | 32 | 182 | 2500 | 1.88 |
32021X2 | 2007121 | 105 | 160 | 33 | 162 | 2000 | 2.5 |
32021 | 2007121E | 105 | 160 | 35 | 205 | 2000 | 2.4 |
32021/YA | 2007121EK | 105 | 160 | 35 | - | - | 2.4 |
32021JR | - | 105 | 160 | 35 | 215 | 2200 | 2.45 |
33007 | 3007107E | 35 | 62 | 20 | 40.8 | 6200 | 0.25 |
33007JR | - | 35 | 62 | 21 | 51.3 | 6200 | 0.263 |
33013 | 3007113E | 65 | 100 | 27 | 98 | 3600 | 0.732 |
33013JR | - | 65 | 100 | 27 | 103 | 3600 | 0.762 |
33017 | 3007117E | 85 | 130 | 36 | 180 | 2800 | 1.69 |
33017JR | - | 85 | 130 | 36 | 177 | 2800 | 1.72 |
33207 | 3007207E | 35 | 72 | 28 | 82.5 | 5300 | 0.515 |
33207JR | - | 35 | 72 | 28 | 87.6 | 5700 | 0.551 |
33109 | 3007709E | 45 | 80 | 26 | 87 | 4500 | 0.535 |
33109JR | - | 45 | 80 | 26 | 87.5 | 4800 | 0.563 |
33117 | 3007717E | 85 | 140 | 41 | 215 | 2600 | 2.43 |
33117JR | - | 85 | 140 | 41 | 224 | 2600 | 2.43 |
33119 | 3007719E | 95 | 160 | 49 | 298 | 2200 | 3.94 |
33119JR | - | 95 | 160 | 49 | 304 | 2300 | 3.89 |
FAQ
Q: Are you a trading company or manufacturer?
A: We are a manufacturer. Factory+Trading company.Q: Could you please tell me the delivery time of your goods?
A: Most orders will be shipped within 3-10 days of payment being received.Q:Can you supply door to door service?
A:Yes,by Express(DHL,FEDEX,TNT,EMS)it will take 3-7 das to your country.Q: Can you tell me the material of your bearings?
A:Stainess steel,Gcr15(bearing steel),carbon steel,chrome steel,plastic,ceramicQ:How about MOQ of your product?
A: Can be negotiated, we will try our best to meet customer needs.Our company is mainly based on wholesale sales, most customers'orders are more than 1 ton.Q:Do you provide samples ? is it free or extra?
A:Yes,we can supply our clients with free sample,but you have to afford international freight.Q:Can you accept OEM and customize?
A:Yes,we can customize for you according to your sample,blueprint or drawings with parameters.Q:Can you tell me the packing of your bearings?
A: single plastic bag+single paper box+single or wooden case+pallet.Q:Does your company have quality assurance?
A:Yes, for 1 years.Q:What is the competitiveness of your company's products compared to other companies?
A:Good Performance, High Precision, High Speed, Low Noise,Long Life.Q:How about your company's strength?A: After Sales Service and Technical Assistance:The company provides after-sales service and technical assistance as per the customer's requirements and needs.Q:What are your terms of payment?
A: Payment<=3000USD, 100% in advance. Payment>=3000USD, at least 30% T/T in advance ,balance before shippment.Q:How to contact us quickly?
A:Please send us an inquiry or message and leave your other contact information, such as phone number, whatsapp account or wechat account, we will contact you as soon as possible and provide the detailed information you need.Should you have any order or request,please do not hesitate to contact us.
Address:
Shandong International Trade Building, No 51 Taiping Road, Qingdao City, Qingdao, Shandong, China
Business Type:
Manufacturer/Factory, Trading Company
Business Range:
Auto, Motorcycle Parts & Accessories, Chemicals, Industrial Equipment & Components, Manufacturing & Processing Machinery, Tools & Hardware
Management System Certification:
ISO 9001, IATF16949
Company Introduction:
Shandong Luyao (Maxideer) International Trade Co, Ltd. Is located in Jinan City, Shandong Province. It was established in 2013 and opened new branch office in Qingdao City of China. Now we have developed to be a professional bearing manufacturer and trading company, with an annual output value of more than US$12.10 million.
All bearings in our factory adopt international quality standard with professional manufacturing equipment, strict quality control, advanced international technology, high-quality service with strong self supporting capacity of products to provide customers with well qualified bearings in fast way.
Our main production including: Deep groove ball bearings, spherical roller bearings, self-aligning ball/roller bearing, tapered roller bearings, cylindrical roller bearings, thrust bearing, etc. The categories of the products on the basis of applying fields: Aerospace bearing, military-project bearing, wagon, passenger and rail traffic wearing, automobile bearing (new energy), wind power bearing, shipping bearing, machine tool bearing, machinery bearing, metallurgy rolling mill bearing and motor bearing, etc.
Our bearings have been sold to more than 40 overseas countries and regions, including Russia, Ukraine, Sweden, France, Italy, Iran, Iraq, Singapore, Myanmar, Thailand, India, Pakistan, the United States, etc.
We always adhere to the purpose: "Quality First, Customer Obsession and Willingness to keep sustainable innovation" purpose, and the business policy: "pursue perfect quality, create first-class brand" to create excellent products and provide first-class service for our customers always in accordance with customers′ requirements.
We are looking forward to establishing a long-term cooperative relationship with you. If you are interested in any of our bearing products, please feel free to contact us.