Inch Series Four Row Tapered Roller Bearings
PMK Inch Series Four Row Tapered Roller Bearings are designed for extreme radial and axial load conditions in heavy-duty, high-speed industrial applications. Built to inch standards, these bearings provide precise rotation, minimal deflection, and long service intervals under continuous stress.
Optimized roller geometry and robust construction ensure reliable operation in severe-duty environments, while inch-dimensional compatibility simplifies replacement and retrofit.
Key benefits
- High load capacity and exceptional rigidity in compact form.
- Handles simultaneous radial and bidirectional axial loads.
- Inch-dimensional compatibility for easy global replacement.
- Optimized roller geometry for reduced friction and wear.
- Reliable operation in severe-duty environments.
Applications
- Rolling mills, crushers, and heavy industrial drives.
- Power transmission and paper manufacturing machinery.
- Steel and mining equipment.
- Large gearbox assemblies and torque converters.
Specifications
| Boundary dimensions (mm) | Designations | Mass kg | Factor (K) | |||||
|---|---|---|---|---|---|---|---|---|
| d | D | T | B | r | r1 | |||
| 244.475 | 327.025 | 193.675 | 193.675 | 1.5 | 3.3 | LM247748DW/LM247710/LM247710D | 44.1 | 1.82 |
| 254.00 | 358.775 | 269.875 | 269.875 | 1.5 | 3.3 | M249748DW/M249710/M249710D | 90 | 1.76 |
| 266.7 | 355.6 | 228.6 | 230.188 | 1.5 | 3.3 | LM451349DW/LM451310/LM451310D | 65.3 | 1.62 |
| 269.875 | 381 | 282.575 | 282.575 | 3.3 | 3.3 | M252349D/M252310/M252310D | 104 | 1.76 |
| 276.225 | 393.700 | 269.878 | 269.878 | 1.5 | 6.4 | EE275109DW/275155/275156D | 110 | 1.45 |
| 279.400 | 393.700 | 269.875 | 269.875 | 1.5 | 6.4 | EE135111DW/135155/135156D | 99 | 1.54 |
| 279.578 | 380.898 | 244.475 | 244.475 | 1.5 | 3.3 | LM654644DW/LM654610/LM654610D | 86 | 1.35 |
| 285.750 | 380.898 | 244.475 | 244.475 | 1.5 | 3.3 | LM654648DW/LM654610/LM654610D | 80 | 1.35 |
| 288.925 | 406.400 | 298.450 | 298.450 | 3.3 | 3.3 | M255449DW/M255410/M255410D | 127 | 1.73 |
| 300.038 | 422.275 | 311.150 | 311.150 | 3.3 | 3.3 | HM256849D/HM256810/HM256810D | 141 | 1.73 |
| 304.648 | 438.048 | 279.400 | 280.990 | 3.3 | 4.8 | M757448DW/M757410/M757410D | 130 | 1.24 |
| 304.800 | 419.100 | 269.875 | 269.875 | 1.5 | 6.4 | M257149DW/M257110/257110D | 108 | 1.76 |
| 501.650 | 336.545 | 336.550 | 3.3 | 6.4 | HM258949D/HM258910/HM258910D | 264 | 1.76 | |
| 304.902 | 412.648 | 266.7 | 266.7 | 3.3 | 3.3 | M257248DW/M257210/M257210D | 109 | 1.83 |
| 305.000 | 438.048 | 279.400 | 280.990 | 3.3 | 4.8 | M757449DW/M757410/M757410D | 131 | 1.29 |
| 317.500 | 422.275 | 269.875 | 269.875 | 1.5 | 3.3 | LM258648DW/LM258610/LM258610D | 86 | 1.83 |
| 447.675 | 327.025 | 327.025 | 3.3 | 3.3 | HM259049D/HM259010/HM259010D | 166 | 1.74 | |
| 330.200 | 444.500 | 301.625 | 301.625 | 3.3 | 3.3 | M260149DW/M260110/M260110D | 132 | 1.76 |
| 333.375 | 469.900 | 342.9 | 342.9 | 3.3 | 3.3 | HM261049DW/HM261010/HM261010D | 196 | 1.73 |
| 341.312 | 457.098 | 254.000 | 254.000 | 1.5 | 3.3 | LM761648D/LM761610/LM761610D | 109 | 1.24 |
| 343.052 | 457.098 | 254.000 | 254.000 | 1.5 | 3.3 | LM761649D/LM761610/LM761610D | 109 | 1.24 |
| 346.075 | 457.098 | 254.000 | 254.000 | 1.5 | 3.3 | EE133137D/133180/133181D | 102 | 1.22 |
| 488.950 | 358.775 | 358.775 | 3.3 | 3.3 | HM262749D/HM262710/HM262710D | 225 | 1.74 | |
| 347.662 | 469.900 | 260.350 | 260.350 | 1.5 | 3.3 | LM262449DW/LM262410/LM262410D | 130 | 1.76 |
| 469.900 | 292.100 | 292.100 | 3.3 | 3.3 | M262449DW/M262410/M262410D | 142 | 1.76 | |
| 355.600 | 444.500 | 241.300 | 241.300 | 1.5 | 3.3 | L163149D/L163110/L163110CD | 88 | 1.90 |
| 457.200 | 252.412 | 252.412 | 1.5 | 3.3 | LM263149D/LM263110/LM263110D | 107 | 1.83 | |
| 482.600 | 269.875 | 265.112 | 1.5 | 3.3 | LM763449DW/LM763410/LM763410D | 136 | 1.24 | |
| 488.950 | 317.500 | 317.500 | 1.5 | 3.3 | M263349DW/LM263310/LM263310D | 179 | 1.76 | |
| 368.300 | 523.875 | 382.588 | 382.588 | 3.3 | 6.4 | HM265049DW/HM265010/HM265010D | 275 | 1.76 |
| 374.650 | 501.65 | 260.350 | 250.825 | 1.5 | 3.3 | LM765149DW/LM765110/LM765110D | 141 | 1.24 |
| 384.175 | 546.100 | 400.050 | 400.050 | 3.3 | 6.4 | HM266449DW/HM266410/HM266410D | 318 | 1.76 |
| 385.762 | 514.350 | 317.500 | 317.500 | 3.3 | 3.3 | LM665949DW/LM665910/LM665910D | 187 | 1.40 |
| 406.400 | 546.100 | 288.925 | 288.925 | 1.5 | 6.4 | LM767749DW/LM767710/LM767710D | 188 | 1.23 |
| 409.575 | 546.100 | 334.962 | 334.962 | 1.5 | 6.4 | M667947D/M667910/M667910D | 217 | 1.4 |
| 415.925 | 590.550 | 434.975 | 434.975 | 3.3 | 6.4 | M268749DW/M268710/M268710D | 396 | 1.76 |
| 431.800 | 571.500 | 279.400 | 279.400 | 1.5 | 3.3 | LM869449DW/LM869410/LM869410D | 188 | 1.07 |
| 571.500 | 336.550 | 336.550 | 1.5 | 3.3 | LM769349DW/LM769310/LM769310D | 239 | 1.33 | |
| 447.675 | 635.000 | 463.550 | 463.550 | 3.3 | 6.4 | M270749DW/M270710/M270710D | 485 | 1.76 |
| 457.200 | 596.900 | 279.400 | 276.225 | 1.5 | 3.3 | L770847DW/L770810/L770810D | 190 | 1.24 |
| 460 | 625.000 | 421.000 | 421.000 | 3.0 | 9.0 | M271149D/M271110/M271110D | 378 | 1.76 |
| 479.425 | 679.450 | 495.300 | 495.300 | 3.3 | 6.4 | M272749DW/M272710/M272710D | 604 | 1.76 |
| 482.600 | 615.950 | 330.200 | 330.200 | 6.4 | 6.4 | LM272248DW/LM272210/LM272210D | 235 | 1.76 |
| 635.000 | 421.000 | 421.000 | 3.0 | 6.4 | M272449D/M272410/M272410D | 358 | 1.76 | |
| 647.700 | 417.512 | 417.512 | 3.3 | 6.4 | M272647DW/M272610/M272610D | 400 | 1.76 | |
| 489.026 | 634.873 | 320.675 | 320.675 | 3.3 | 3.3 | LM772749DW/LM772710/LM772710D | 254 | 1.24 |
| 501.650 | 711.200 | 520.700 | 520.700 | 3.3 | 6.4 | M274149DW/M274110/M274110D | 691 | 1.76 |
| 508.00 | 762.000 | 463.550 | 463.550 | 6.4 | 6.4 | EE531201D/531300/531301D | 741 | 1.54 |
| 514.350 | 673.100 | 422.275 | 422.275 | 3.3 | 6.4 | LM274449DW/LM274410/LM274410D | 400 | 1.83 |
| 519.112 | 736.600 | 536.575 | 536.575 | 3.3 | 6.4 | M275349DW/M275310/M275310D | 791 | 1.76 |
| 558.800 | 736.600 | 322.268 | 322.268 | 3.3 | 6.4 | EE843221DW/843290/843291D | 378 | 1.7 |
| 736.600 | 409.575 | 409.575 | 3.3 | 6.4 | LM377449DW/LM377410/LM377410D | 482 | 1.69 | |
| 571.5 | 812.8 | 593.725 | 593.725 | 3.3 | 6.4 | M278749DW/M278710/M278710D | 1007 | 1.76 |
| 584.200 | 762.000 | 401.638 | 396.875 | 3.3 | 6.4 | LM778549DW/LM778510/LM778510D | 468 | 1.24 |
| 585.788 | 771.525 | 479.425 | 479.425 | 3.3 | 6.4 | LM278849D/LM278810/LM278810D | 606 | 1.76 |
| 595.312 | 844.550 | 615.950 | 615.950 | 3.3 | 6.4 | M280049D/M280010/M280010D | 1155 | 1.76 |
| 609.600 | 787.400 | 361.950 | 361.950 | 3.3 | 6.4 | EE649241DW/649310/649311D | 467 | 1.58 |
| 813.562 | 479.425 | 479.425 | 3.3 | 6.4 | LM280249DW/LM280210/LM280210D | 715 | 1.76 | |
| 863.600 | 660.400 | 660.400 | 3.3 | 6.4 | M280349D/M280310/M280310D | 1263 | 1.76 | |
| 635.000 | 901.700 | 654.050 | 654.050 | 3.3 | 6.4 | M281049DW/M281010/M281010D | 1437 | 1.76 |
| 646.112 | 857.250 | 542.925 | 542.925 | 3.3 | 6.4 | LM281049DW/LM281010/LM281010D | 873 | 1.76 |
| 650.000 | 915.000 | 674.000 | 674.000 | 3.3 | 6.4 | M281349D/M281310/M281310D | 1437 | 1.76 |
| 657.225 | 933.450 | 676.275 | 676.275 | 3.3 | 6.4 | M281649D/M281610/M281610D | 1546 | 1.76 |
| 659.925 | 854.923 | 318.480 | 319.192 | 4.8 | 9.7 | EE749259DW/749334/749335D | 457 | 1.66 |
| 660.400 | 812.800 | 365.125 | 365.125 | 3.3 | 6.4 | L281149D/L281110/L281110D | 415 | 1.76 |
| 679.450 | 901.700 | 552.450 | 552.450 | 3.3 | 6.4 | LM281849DW/LM281810/LM281810D | 1005 | 1.76 |
| 682.625 | 965.200 | 701.675 | 701.675 | 3.3 | 6.4 | M282249D/M282210/M282210D | 1736 | 1.76 |
| 685.8 | 876.3 | 355.6 | 352.425 | 3.3 | 6.4 | EE655271D/EE655345/EE655346D | 579 | 1.4 |
| 708.025 | 930.275 | 565.150 | 565.150 | 3.3 | 6.4 | LM282549D/LM282510/LM282510D | 1061 | 1.70 |
| 710.000 | 900.000 | 410.000 | 410.000 | 3.3 | 6.4 | L882449DW/L882410/L882410D | 633 | 1.66 |
| 711.200 | 914.400 | 317.500 | 317.500 | 3.3 | 6.4 | EE755281D/755360/755361D | 537 | 1.54 |
| 717.550 | 946.150 | 565.150 | 565.150 | 3.3 | 6.4 | LM282847DW/LM282810/LM282810D | 1127 | 1.76 |
| 749.300 | 990.600 | 605.000 | 605.000 | 3.3 | 6.4 | LM283649D/LM283610/LM283610D | 1328 | 1.76 |
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