Inch Size Four Row Taper Roller Bearing
Applications
Steel & Metal Industry – Rolling mills, continuous casting machines
Heavy Machinery – Mining, construction, and material handling equipment
Railway Industry – Locomotive and freight car axle systems
Industrial Gearboxes – High-load power transmission systems
Paper Mills – Press and drying cylinders
Key Benefits
Exceptional Load Capacity – Supports extremely high radial loads with axial load capability
Superior Rigidity & Stability – Ensures precise shaft alignment and reduces deflection
Enhanced Durability – High-quality materials and heat treatments extend service life
Optimized Performance – Reduces friction, heat generation, and energy loss for efficiency
Reliable Under Harsh Conditions – Withstands impact, shock loads, and vibrations in demanding environments
Ease of Maintenance – Designed for simplified installation and servicing, minimizing downtime
An inch size four row taper roller bearing is a type of bearing that features four rows of tapered rollers arranged in a specific configuration to support radial and axial loads. This design allows the bearing to handle heavy radial and thrust loads while maintaining high precision and durability.

| Designation | SKF | d (mm/in) | D (mm/in) | T (mm/in) | B (mm/in) | d1 (mm/in) | D1 (mm/in) | Weight (kg) |
| 331329 (M231649DW-610-610D) | 331329 | 152,400 | 222,250 | 174,625 | 174,625 | 171 | 194 | 22.5 |
| 60,000 | 87,500 | 68,750 | 68,750 | |||||
| 330835C (46791DW-720-721D) | 330835C | 165,100 | 225,425 | 168,275 | 165,100 | 182 | 198 | 20.5 |
| 65,000 | 88,750 | 66,250 | 65,000 | |||||
| 331480 (67790DW-720-721D) | 331480 | 177,800 | 247,650 | 192,088 | 192,088 | 193 | 216 | 29 |
| 70,000 | 97,500 | 75,625 | 75,625 | |||||
| 331382 (M238849DW-810-810D) | 331382 | 187,325 | 269,875 | 211,138 | 211,138 | 209 | 241 | 41 |
| 73,750 | 106,250 | 83,125 | 83,125 | |||||
| BT4B328881/HA1 (M238849DW-810-810D) | BT4B328881/HA1 | 269,875 | 211,138 | 211,138 | 209 | 239 | 41 | |
| 106,250 | 83,125 | 83,125 | ||||||
| 331249 (67885DW-820-820D) | 331249 | 190,500 | 269,875 | 188,912 | 187,325 | 208 | 233 | 33.5 |
| 75,000 | 105,000 | 74,375 | 73,750 | |||||
| 330899A (M240648DW-611-611D) | 330899A | 198,488 | 284,162 | 225,425 | 225,425 | 218 | 252 | 47.5 |
| 78,125 | 111,875 | 88,750 | 88,750 | |||||
| BT4B328065/HA1 | BT4B328065/HA1 | 205 | 320 | 203,500 | 203,500 | 233 | 280 | 54.5 |
| 80,709 | 125,984 | 80,118 | 80,118 | |||||
| 331486 (67985DG-920-921D) | 331486 | 206,375 | 282,575 | 190,500 | 190,500 | 223 | 247 | 36.5 |
| 81,250 | 111,250 | 75,000 | 75,000 | |||||
| BT4B332637/HA1 (LM245149DW-110-110D) | BT4B332637/HA1 | 228,600 | 311,150 | 200,025 | 200,025 | 248 | 282 | 43.5 |
| 90,000 | 122,500 | 78,750 | 78,750 | |||||
| 331787 (EE127094DW-138-139D) | 331787 | 241,224 | 355,498 | 228,600 | 228,600 | 271 | 308 | 81.5 |
| 94,970 | 139,960 | 90,000 | 90,000 | |||||
| 330782A (EE127097DW-135-136D) | 330782A | 241,478 | 349,148 | 228,600 | 228.6 | 271 | 308 | 74.5 |
| 95,070 | 137,460 | 90,000 | 90,000 | |||||
| 137,460 | 90,000 | 90,000 | ||||||
| 330862B (LM247748D-710-710D) (LM24778DGEW-710-710D) | 330862B | 244,475 | 327,025 | 193.675 | 193,675 | 264 | 299 | 46 |
| 96,250 | 128,750 | 76,250 | 76,250 | |||||
| 128,750 | 76,250 | 76,250 | ||||||
| BT4B328690/HA1 (EE126096DW-150-151D) | BT4B328690/HA1 | 381 | 304,800 | 304,800 | 275 | 321 | 130 | |
| 150,000 | 120,000 | 120,000 | ||||||
| 331398 | 331398 | 245 | 380 | 254 | 255,500 | 280 | 329 | 105 |
| 96,457 | 149,606 | 100,000 | 100,591 | |||||
| 614096B (EE220975DW-1575-1576D) | 614096B | 247,650 | 400,050 | 253,995 | 249,235 | 295 | 346 | 120 |
| 97,500 | 157,500 | 99,998 | 98,124 | |||||
| 331275A (M249749DW-710-710D) | 331275A | 254 | 358,775 | 269,875 | 269,875 | 279 | 319 | 88 |
| 100,000 | 141,250 | 106,250 | 106,250 | |||||
| BT4B328551/HA1 | BT4B328551/HA1 | 260 | 440 | 298,500 | 298,500 | 300 | 372 | 190 |
| 102,362 | 173,228 | 117,250 | 117,250 | |||||
| 330822B (76589DW-520-520D) | 330822B | 266,700 | 355,600 | 228,600 | 230,188 | 288 | 318 | 65.5 |
| 105,000 | 140,000 | 90,000 | 90,625 | |||||
| BT4B331168B (M252349DW-310-310D) | BT4B331168B | 269,875 | 381,000 | 282,575 | 282,575 | 296 | 339 | 105 |
| 106,250 | 150,000 | 111,250 | 111,250 | |||||
| 331288 (EE275109D-155-156D) | 331288 | 276,225 | 393,700 | 269,875 | 269,875 | 302 | 351 | 100 |
| 108,750 | 155,000 | 106,250 | 106,251 | |||||
| BT4B328293/HA1 | BT4B328293/HA1 | 279,400 | 381 | 269,875 | 269,875 | 300 | 340 | 91 |
| 110,000 | 150,000 | 106,250 | 106,250 | |||||
| 330540A (LM654644DW-610-610D) | 330540A | 279,578 | 380,898 | 244,475 | 244,475 | 308 | 337 | 86 |
| 110,070 | 149,960 | 96,250 | 96,250 | |||||
| 330540AG (LM654644DGW-610-610D) | 330540AG | 380,898 | 244,475 | 244,475 | 308 | 337 | 86 | |
| 149,960 | 96,250 | 96,250 | ||||||
| 330337A (LM654648DW-610-610D) | 330337A | 285,750 | 380,898 | 244,475 | 244,475 | 308 | 337 | 81 |
| 112,500 | 149,960 | 96,250 | 96,250 | |||||
| 330337AG (LM654648DGW-610-610D) | 330337AG | 380,898 | 244,475 | 244,475 | 308 | 337 | 81 | |
| 149,960 | 96,250 | 96,250 | ||||||
| BT4B331452/HA1 (M255449DW-410-410D) | BT4B331452/HA1 | 288,925 | 406,400 | 298,450 | 298,450 | 314 | 361 | 125 |
| 113,750 | 160,000 | 117,500 | 117,500 | |||||
| BT4B331452G/HA1 (M255449DGW-410-410D) | BT4B331452G/HA1 | 406,400 | 298,450 | 298,450 | 314 | 361 | 125 | |
| 160,000 | 117,500 | 117,500 | ||||||
| BT4B328725G/HA1 | BT4B328725G/HA1 | 300 | 440 | 279,400 | 280,988 | 334 | 380 | 145 |
| 118,110 | 173,228 | 110,000 | 110,625 | |||||
| BT4B332472 | BT4B332472 | 460 | 388,500 | 388,500 | 336 | 400 | 240 | |
| 181,102 | 152,953 | 152,953 | ||||||
| BT4B331687/HA1 (M257149DW-110-110D) | BT4B331687/HA1 | 304,800 | 419,100 | 269,875 | 269,875 | 328 | 378 | 110 |
| 120,000 | 165,000 | 106,250 | 106,250 | |||||
| 330693C | 330693C | 482,600 | 377,825 | 365,125 | 348 | 416 | 265 | |
| 190,000 | 148,750 | 143,750 | ||||||
| 330758A (M257248DW-210-210D) | 330758A | 304,902 | 412,648 | 266,700 | 266,700 | 329 | 371 | 105 |
| 120,040 | 162,460 | 105,000 | 105,000 | |||||
| 330758AG (M257248DGW-210-210D) | 330758AG | 412,648 | 266,700 | 266,700 | 329 | 371 | 105 | |
| 162,460 | 105,000 | 105,000 | ||||||
| BT4B332647G/HA1 (M260149DGW-110-110D) | BT4B332647G/HA1 | 330,200 | 444,500 | 301,625 | 301,625 | 357 | 401 | 135 |
| 130,000 | 175,000 | 118,750 | 118,750 | |||||
| 331381 (HM261049DGW-010-010D) | 331381 | 333,375 | 469,900 | 342,900 | 342,900 | 365 | 419 | 190 |
| 131,250 | 185,000 | 135,000 | 135,000 | |||||
| BT4B331553/HA1 | BT4B331553/HA1 | 342,900 | 571,500 | 342,900 | 342,540 | 393 | 508 | 365 |
| 135,000 | 225,000 | 135,000 | 134,858 | |||||
| 330661C (LM761649DG-610-610D) | 330661C | 343,052 | 457,098 | 254 | 254, | 370 | 410 | 110 |
| 135,060 | 179,960 | 100,000 | 100,000 | |||||
| 330661CG (LM761649DGW-610-610D) | 330661CG | 457,098 | 254 | 254 | 370 | 410 | 110 | |
| 179,960 | 100,000 | 100,000 | ||||||
| BT4B331077AG/HA1 (LM262449DGW-410-410D) | BT4B331077AG/HA1 331092A | 347,662 | 469,900 | 260,350 | 260,350 | 399 | 428 | 130 |
| 136,875 | 185,000 | 102,500 | 102,500 | |||||
| 331092A (M262449DG-410-410D) | 469,900 | 292,100 | 292,100 | 377 | 426 | 150 | ||
| 185,000 | 115,000 | 115,000 | ||||||
| 330662AG (LM763449DGW-410-410D) | 330662AG | 355,600 | 482,600 | 269,875 | 265,112 | 384 | 430 | 140 |
| 140,000 | 190,000 | 106,250 | 104,375 | |||||
| 331271 (M263349DGW-310-310D) | 331271 | 488,950 | 317,500 | 317,500 | 392 | 439 | 195 | |
| 192,500 | 125,000 | 125,000 | ||||||
| 332059 | 332059 | 360 | 510 | 380 | 380 | 393 | 454 | 255 |
| 141,732 | 200,787 | 149,606 | 14,960,6 | |||||
| BT4B328159/HA1 | BT4B328159/HA1 | 540 | 280, | 280, | 400 | 478 | 230 | |
| 212,600 | 110,236 | 110,236 | ||||||
| 331159A (HM265049DGW-010-010D) | 331159A | 368,300 | 523,875 | 382,588 | 382,588 | 402 | 464 | 275 |
| 145,000 | 206,250 | 150,625 | 150,625 | |||||
| BT4B332188/HA1 | BT4B332188/HA1 | 374,650 | 501,650 | 260,350 | 250,825 | 400 | 452 | 140 |
| 147,500 | 197,500 | 102,500 | 98,750 | |||||
| BT4B328294/HA1 | BT4B328294/HA1 | 380 | 560 | 325 | 325 | 417 | 504 | 265 |
| 149,606 | 220,472 | 127,953 | 127,953 | |||||
| BT4B328816/HA1 | BT4B328816/HA1 | 560 | 360 | 360 | 417 | 497 | 295 | |
| 220,472 | 141,732 | 141,732 | ||||||
| BT4B332889/HA1 | BT4B332889/HA1 | 620 | 368 | 368 | 433 | 538 | 438 | |
| 244,094 | 152,165 | 152,165 | ||||||
| 331149A | 331149A | 384,175 | 546,100 | 400,050 | 400,050 | 419 | 484 | 310 |
| (HM266449DGW-410-410D) | 151,250 | 215,000 | 157,500 | 157,500 | ||||
| BT4B332824/HA1 | BT4B332824/HA1 | 395 | 545 | 288,900 | 268 | 440 | 489 | 195 |
| 155,512 | 214,567 | 113,740 | 105,512 | |||||
| BT4B331333/HA1 (M667947DA-910-910D) BT4B328967/HA1 | BT4B331333/HA1 | 409,575 | 546,100 | 334,962 | 334,962 | 454 | 523 | 220 |
| BT4B328967/HA1 | 161,250 | 215,000 | 131,875 | 131,875 | 454 | 523 | 220 | |
| 546,100 | 334,962 | 334,962 | ||||||
| 215,000 | 131,875 | 131,875 | ||||||
| 331160A | 331160A | 415,925 | 590,550 | 434,975 | 434,975 | 454 | 523 | 395 |
| (M268749DGW-710-710D) | 163,750 | 232,500 | 171,250 | 171,250 | ||||
| BT4B328826G/HA1 | BT4B328826G/HA1 | 420 | 560 | 437 | 437 | 450 | 553 | 285 |
| BT4B328374/HA1 | BT4B328374/HA1 | 165,354 | 220,473 | 172,047 | 172,047 | 469 | 553 | 375 |
| 620 | 355 | 355 | ||||||
| 244,094 | 139,764 | 139,764 | ||||||
| 332060 | 332060 | 431,800 | 635 | 355,600 | 355,600 | 475 | 568 | 385 |
| (EE931070DGW-250-251XD) BT4B334019G/HA1 | BT4B334019G/HA1 | 170,000 | 250,000 | 140,000 | 140,000 | 475 | 568 | 405 |
| (cont.) | 635 | 355,600 | 440 | |||||
| 250,000 | 140,000 | 173,228 | ||||||
| BT4B328829/HA1 | BT4B328829/HA1 | 440 | 580 | 420 | 420 | 470 | 528 | 300 |
| 332313 | 332313 | 173,228 | 228,346 | 165,354 | 165,354 | 482 | 567 | 410 |
| 650 | 353,500 | 353,500 | ||||||
| 255,906 | 139,173 | 139,173 | ||||||
| BT4B328670 | BT4B328670 | 444,500 | 571,500 | 336,550 | 336,550 | 470 | 528 | 215 |
| 17,500 | 225,000 | 132,500 | 132,500 | |||||
| 330608C | 330608C | 447,675 | 635 | 463,550 | 463,550 | 488 | 563 | 485 |
| (M270749DGW-710-710D) | 176,250 | 250,000 | 182,500 | 182,500 | ||||
| BT4B328287G/HA1 (EE671798DGW-2873-2875D) | BT4B328287G/HA1 | 457,073 | 730,148 | 419,100 | 412,750 | 530 | 637 | 630 |
| 179,950 | 287,460 | 165,000 | 162,500 | |||||
| BT4B328913G/HA1 | BT4B328913G/HA1 | 457 | 600 | 368 | 368 | 505 | 552 | 250 |
| BT4B329007/HA1 | BT4B329007/HA1 | 187,008 | 236,220 | 144,882 | 144,882 | 510 | 598 | 460 |
| 660 | 450 | 450 | ||||||
| 259,843 | 177,165 | 177,165 | ||||||
| 330886B | 330886B | 479,425 | 679,450 | 495,300 | 495,300 | 514 | 567 | 605 |
| (M272749DGW-710-710D) | 188,750 | 267,500 | 195,000 | 195,000 | ||||
| BT4B328391G/HA1 | BT4B328391G/HA1 | 488,950 | 622,300 | 365,125 | 365,125 | 515 | 570 | 265 |
| 192,500 | 245,000 | 143,750 | 143,750 | |||||
| BT4B331499G/HA1 (EE641198DGW-265-266D) 331081A | BT4B331499G/HA1 331081A | 501,650 | 673,100 | 387,350 | 400,050 | 538 | 612 | 395 |
| (M274149DGW-110-110D) | 197,500 | 265,000 | 152,500 | 157,500 | ||||
| 711,200 | 520,700 | 520,700 | 546 | 631 | 755 | |||
| 280,000 | 205,000 | 205,000 | ||||||
| 331157A | 331157A | 514,350 | 673,100 | 422,275 | 422,275 | 549 | 612 | 410 |
| (LM274449DGW-410-410D) | 202,500 | 265,000 | 166,250 | 166,250 | ||||
| 331078A | 331078A | 519,112 | 736,600 | 536,575 | 536,575 | 567 | 653 | 755 |
| (M275349DGW-310-310D) | 204,375 | 290,000 | 211,250 | 211,250 | ||||
| BT4B331174/HA1 (M276449DGW-410-410D) | BT4B331174/HA1 | 536,575 | 761,873 | 558,800 | 558,800 | 586 | 675 | 835 |
| 211,250 | 299,950 | 220,000 | 220,000 | |||||
| 331978 | 331978 | 540 | 690 | 400 | 400 | 571 | 637 | 375 |
| BT4B334038G/HA3 | BT4B334038G/HA3 | 212,598 | 271,654 | 157,480 | 157,480 | 565 | 400 | |
| 690 | 400 | 434 | 637 | |||||
| 271,654 | 157,480 | 170,866 | ||||||
| 330529B | 330529B | 571,500 | 812,800 | 593,725 | 593,725 | 625 | 720 | 1000 |
| (M278749DGW-710-710D) | 225,000 | 320,000 | 233,750 | 233,750 | ||||
| 331093A | 331093A | 585,788 | 771,525 | 479,425 | 479,425 | 625 | 702 | 625 |
| (LM278849DGW-810-810D) | 230,625 | 303,750 | 188,750 | 188,750 | ||||
| 331566 | 331566 | 596,900 | 980 | 609,600 | 604,838 | 686 | 851 | 1920 |
| 235,000 | 385,827 | 240,000 | 238,125 | |||||
| 331625 | 331625 | 603,250 | 857,250 | 622,300 | 622,300 | 656 | 760 | 1235 |
| (M280249DGW-210-210XD) | 236,220 | 337,500 | 245,000 | 245,000 | ||||
| 330990A | 330990A | 635 | 901,700 | 654,050 | 654,050 | 694 | 800 | 1420 |
| (M281049*DGW-010-010D) | 250,000 | 355,000 | 257,500 | 257,500 | ||||
| BT4B332671/HA1 (LM281049DGW-310-310D) | BT4B332671/HA1 | 646,112 | 857,250 | 542,925 | 542,925 | 690 | 776 | 875 |
| 254,375 | 337,500 | 213,750 | 213,750 | |||||
| 330824A | 330824A | 657,225 | 933,450 | 676,275 | 676,275 | 718 | 827 | 1575 |
| (M281649DGW-610-610D) | 258,750 | 367,500 | 266,250 | 266,250 | ||||
| 331190 | 331190 | 660,400 | 812,800 | 365,125 | 365,125 | 698 | 751 | 420 |
| (L281149DGW-110-110D) | 260,000 | 320,000 | 143,750 | 143,750 | ||||
| BT4B332906/HA4 | BT4B332906/HA4 | 676 | 910 | 620 | 620 | 725 | 821 | 1150 |
| 266,142 | 358,268 | 244,094 | 244,094 | |||||
| 331503G/HA1 | 331503G/HA1 | 682,625 | 965,200 | 701,675 | 701,675 | 740 | 857 | 1750 |
| (M282249DGW-210-210D) | 268,750 | 380,000 | 276,250 | 276,250 | ||||
| BT4B332098A/HA4 | BT4B332098A/HA4 | 708,025 | 930,275 | 565,150 | 565,150 | 756 | 846 | 1030 |
| (LM282549DGW-510-510D) | 278,750 | 366,250 | 222,500 | 222,500 | ||||
| 330882C | 330882C | 711,200 | 914,400 | 317,500 | 317,500 | 765 | 847 | 525 |
| (EE755281DGW-360-361D) | 280,000 | 360,000 | 125,000 | 125,000 | ||||
| 332244 | 332244 | 717,550 | 946,150 | 565,150 | 565,150 | 768 | 860 | 1090 |
| (LM-282847DGW-810-810D) | 282,500 | 372,500 | 222,500 | 222,500 | ||||
| 330803A | 330803A | 730,250 | 1,035,050 | 755,650 | 755,650 | 793 | 918 | 2170 |
| (M283449DGW-410-410D) | 287,500 | 407,500 | 297,500 | 297,500 | ||||
| BT4B328376/HA4 | BT4B328376/HA4 | 750 | 1130 | 690 | 690 | 826 | 990 | 2430 |
| 295,276 | 444,882 | 271,654 | 271,654 | |||||
| 331248 | 331248 | 812,800 | 1143 | 768,350 | 768,350 | 888 | 1025 | 2590 |
| 320,000 | 450,000 | 302,500 | 302,500 |
These bearings are commonly used in heavy machinery, such as rolling mills, gearboxes, and large industrial equipment, where high load-carrying capacity and reliability are essential. The four row taper roller design provides excellent rigidity and stability under heavy loads, making it suitable for demanding applications in various industries.
Features of Inch Size Four Row Taper Roller Bearing
The inch size four row taper roller bearing offers several key features that make it a popular choice for applications requiring high load capacity and reliability. One of the main features is its ability to accommodate both radial and axial loads simultaneously, making it versatile for various types of machinery.
Additionally, these bearings are designed for high-speed operations, providing smooth and efficient performance even under demanding conditions. The four row configuration distributes the load evenly across the rollers, reducing friction and wear, which leads to extended bearing life and reduced maintenance costs.
Moreover, inch size four row taper roller bearings are precision-engineered to meet stringent quality standards, ensuring consistent performance and dimensional accuracy. This level of precision makes them ideal for critical applications where precise motion control and alignment are crucial.
Applications of Inch Size Four Row Taper Roller Bearing
The inch size four row taper roller bearing is widely used in various industries due to its exceptional load-carrying capacity and reliability. Some common applications include steel mills, mining equipment, construction machinery, and agricultural machinery.
These bearings are particularly well-suited for applications that involve heavy radial and axial loads, such as in conveyor systems, heavy-duty vehicles, and power transmission equipment. Their robust construction and high load capacity make them an essential component in many industrial processes that require efficient power transmission and motion control.

