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Tapered roller bearing sets, inch: LM11949 / LM11910, LM12749 / LM12710, L44649 / L44610, LM67048 / LM67010 (Timken): bore, OD, T, B, C and shoulder diameters
What are the dimensions of the Timken LM11949 / LM11910, LM12749 / LM12710, L44649 / L44610 and LM67048 / LM67010 tapered roller bearings: bore, OD, cone width, cup width, overall width and backing diameters? · Standard part · basis: Timken's own specification sheets and part page (mm and inch, checked 25.4), agreeing with four distributor listings; Timken CAD part pages linked
Also called: LM11949 LM11910 dimensions, LM12749 LM12710 dimensions, L44649 L44610 dimensions, LM67048 LM67010 dimensions, L44649 bearing size, LM67048 bearing size, LM11949 bearing size, trailer wheel bearing size, trailer bearing dimensions, 1-1/16 tapered roller bearing, 1-1/4 tapered roller bearing, 3/4 tapered roller bearing LM11949, tapered roller bearing set inch, bearing cone and cup set dimensions, L4
Exact dimensions. Every file is drawn at true size with no tolerance added. The holes and pins that meet another part are listed below under Mating features, with the fit each joint needs; open those by your process's clearance before making the part. Mating features
- sizes
- 22 in table
Notes
- Inch-series tapered roller bearings are sold as a cone (inner ring with rollers) and a cup (outer ring), each with its own number: LM11949 is the cone and LM11910 the cup. These four sets are common in trailer hubs, small wheels and light automotive uses; the table is transposed so the four sets sit side by side. The two LM119 / LM127 sets share the same cup size (Ø45.237 x 12.065) and cone width and differ only in bore (19.050 and 21.986).
- Numbers: Timken's own data. LM11949 / LM11910, LM12749 / LM12710 and L44649 / L44610 are Timken specification sheets (hosted by Purvis Industries); LM67048 / LM67010 is Timken's part page on cad.timken.com. Every mm value equals the printed inch value times 25.4 (checked). Cross-checks that agree: Acorn and bearings-online (LM11949: 19.05 x 45.24 x 15.49, C 0.4750 in), eIndustrial and Rubix (LM12749: 0.8656 in bore, 1.781 in OD, 15.494 wide), RS Components (L44649: 26.98 x 50.29; LM67048: 31.75 x 59.13).
- T is not the cone width. On these sets the cone is wider than the overall width T (B > T); T is Timken's 'bearing width', the overall width of the cone-and-cup set as assembled. The radius rows are as Timken prints them: 'to clear' radii R (cone) and r (cup) on three sets, and 'max shaft fillet radius' / 'max housing fillet radius' on LM67048 / LM67010 (0.140 and 0.050 in; the page prints 3.600 and 1.27 mm, while 0.140 in is 3.556 mm, and the L44649 sheet prints 3.56 for the same 0.14 in). Backing diameters are Timken's recommended shoulder diameters for the shaft (da, db) and housing (Da, Db); they are the numbers to design a shoulder against.
- Files: none. The cone and cup raceway cones are not boundary dimensions, so there is no ring envelope to draw from these numbers; Timken's own part pages carry 3D and 2D CAD views (link below).
- Left out: the other sets people ask for (25580 / 25520, L68149 / L68111, 14125A / 14276, 15101 / 15245 and so on: no data sheet was read), the metric-bore inch-series conversions, load ratings, and Timken's fitting practice (the online tool; the Timken guide read only points to it and does not print class values).
Tapered roller bearing sets, inch: LM11949 / LM11910, LM12749 /… size chart
| dimension | LM11949 / LM11910 | LM12749 / LM12710 | L44649 / L44610 | LM67048 / LM67010 |
|---|---|---|---|---|
| cone / cup | LM11949 / LM11910 | LM12749 / LM12710 | L44649 / L44610 | LM67048 / LM67010 |
| bore d, mm | 19.050 | 21.986 | 26.988 | 31.750 |
| bore d, in | 0.7500 | 0.8656 | 1.0625 | 1.2500 |
| cup OD D, mm | 45.237 | 45.237 | 50.292 | 59.131 |
| cup OD D, in | 1.7810 | 1.7810 | 1.9800 | 2.3280 |
| cone width B, mm | 16.637 | 16.637 | 14.732 | 16.764 |
| cone width B, in | 0.6550 | 0.6550 | 0.5800 | 0.6600 |
| cup width C, mm | 12.065 | 12.065 | 10.668 | 11.811 |
| cup width C, in | 0.4750 | 0.4750 | 0.4200 | 0.4650 |
| overall width T, mm | 15.494 | 15.494 | 14.224 | 15.875 |
| overall width T, in | 0.6100 | 0.6100 | 0.5600 | 0.6250 |
| cone backface 'to clear' radius R / max shaft fillet, mm (as printed) | 1.27 | 1.27 | 3.56 | 3.6 |
| cup backface 'to clear' radius r / max housing fillet, mm | 1.27 | 1.27 | 1.27 | 1.27 |
| cone frontface backing Ø da, mm | 23.62 | 25.91 | 30.99 | 36 |
| cone backface backing Ø db, mm | 24.89 | 27.43 | 37.59 | 42.5 |
| cup frontface backing Ø Da, mm | 41.9 | 42.4 | 47.5 | 55.9 |
| cup backface backing Ø Db, mm | 39.62 | 39.62 | 44.45 | 52.07 |
| cage-cone frontface clearance Ab, mm | 1.3 | 1 | 1.3 | 1.3 |
| cage-cone backface clearance Aa, mm | -0.3 | 0.3 | 0.5 | 0.3 |
| effective center location a, mm | -5.6 | -5.3 | -3.3 | -3 |
| ISO factor e | 0.3 | 0.31 | 0.37 | 0.41 |
| ISO factor Y | 2 | 1.96 | 1.6 | 1.46 |
Mating features
Drawn at the exact size. Open press, slide, run and socket features by your process's clearance (tolerances by process); leave designed gaps and clamp fits as drawn.
| feature | exact | mates with | fit | files |
|---|---|---|---|---|
| cone frontface backing Ø da | Ø23.62 / 25.91 / 30.99 / 36 (LM11949 / LM12749 / L44649 / LM67048) | shaft shoulder (front) that the cone's small end sits against: Timken's backing diameter; make the shoulder at least this | designed | all |
| cone backface backing Ø db | Ø24.89 / 27.43 / 37.59 / 42.5 | shaft shoulder (back): Timken's backing diameter | designed | all |
| cup frontface backing Ø Da | Ø41.90 / 42.40 / 47.50 / 55.90 | housing shoulder (front) for the cup: Timken's backing diameter | designed | all |
| cup backface backing Ø Db | Ø39.62 / 39.62 / 44.45 / 52.07 | housing shoulder (back) for the cup: Timken's backing diameter | designed | all |
| corner radii R, r (max fillet) | R 1.270 / 1.270 / 3.560 / 3.600 mm, r 1.27 mm | shaft and housing corner fillets must not exceed these so the cone and cup seat on their faces | designed | all |
Where the files are
Other publishers' files are linked, not hosted. "verify" = check the license at the link before commercial use.
Xem scan
File coming
No downloadable true-size file yet: the published figures do not fix the whole shape, and Xem never guesses a number. A measured scan is planned; request it and it moves up.
https://xemstudio.com/mcp to Claude, ChatGPT, Cursor or any MCP client (free, no account, one minute) and it can look up exact sizes, mating fits and free STEP/STL from every chat.Plain text: sheet.txt · JSON: /api/geometry?object=tapered-roller-bearings-inch-lm11949-l44649-lm67048
Fits with
Questions
What are the dimensions of an LM11949 / LM11910 bearing?
Bore 19.050 mm (0.7500 in), OD 45.237 mm (1.7810 in), cone width 16.637, cup width 12.065, overall width T 15.494 mm.
What are the dimensions of an L44649 / L44610 bearing?
Bore 26.988 mm (1.0625 in), OD 50.292 mm (1.9800 in), cone width 14.732, cup width 10.668, T 14.224 mm.
What are the dimensions of an LM67048 / LM67010 bearing?
Bore 31.750 mm (1-1/4 in), OD 59.131 mm (2.3280 in), cone width 16.764, cup width 11.811, T 15.875 mm.
What are the dimensions of an LM12749 / LM12710 bearing?
Bore 21.986 mm (0.8656 in), OD 45.237 mm (1.7810 in), cone width 16.637, cup width 12.065, T 15.494 mm.
What shoulder diameters do these bearings need?
Timken's backing diameters are in the table: for L44649 / L44610, shaft shoulders 30.99 mm (front) and 37.59 mm (back), housing shoulders 47.50 mm (front) and 44.45 mm (back).