Tapered roller bearing sets, inch: LM11949 / LM11910, LM12749 / LM12710, L44649 / L44610, LM67048 / LM67010 (Timken): bore, OD, T, B, C and shoulder diameters — dimension sheet Source: Xem Studio, https://xemstudio.com/objects/tapered-roller-bearings-inch-lm11949-l44649-lm67048/ (sheet CC BY 4.0) 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 Catalog version: 2026-10-20 Sizes: see table below - 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). 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 Files elsewhere (not hosted by Xem Studio; license as stated by the publisher): - Timken (specification sheet via Purvis Industries): LM11949 / LM11910: d 19.050, D 45.237, B 16.637, C 12.065, T 15.494, R 1.270, r 1.27, backing diameters, e, Y — web — Publisher's page; dimensions are facts — https://www.purvisindustries.com/ASSETS/DOCUMENTS/ITEMS/EN/Timken_LM11949_2_Specification_Sheet.pdf - Timken (specification sheet via Purvis Industries): LM12749 / LM12710: d 21.986, D 45.237, B 16.637, C 12.065, T 15.494, backing diameters, e, Y — web — Publisher's page; dimensions are facts — https://www.purvisindustries.com/ASSETS/DOCUMENTS/ITEMS/EN/Timken_LM12749_2_Specification_Sheet.pdf - Timken (specification sheet via Purvis Industries): L44649 / L44610: d 26.988, D 50.292, B 14.732, C 10.668, T 14.224, R 3.560, r 1.27, backing diameters, e, Y — web — Publisher's page; dimensions are facts — https://www.purvisindustries.com/ASSETS/DOCUMENTS/ITEMS/EN/Timken_L44649_2_Specification_Sheet.pdf - Timken (part page, cad.timken.com): LM67048 / LM67010: d 31.750, D 59.131, B 16.764, C 11.811, T 15.875, fillet radii, backing diameters, e, Y; page offers 3D / 2D CAD views — web — Publisher's page; dimensions are facts — https://cad.timken.com/item/tapered-roller-bearings-ts-tapered-single-/tapered-roller-bearings-ts-tapered-single-imperi-2/lm67048-lm67010 - Acorn Industrial (distributor): LM11949 / LM11910: 19.05 x 45.24 x 15.49 mm (cross-check) — web — Publisher's page; dimensions are facts — https://www.acorn-ind.co.uk/p/timken/single-row-tapered-roller-bearings/lm11949/lm11910-timken - bearings-online.co.uk (distributor): LM11949 / LM11910: d 0.7500 in, D 1.7810 in, T 0.6100 in, C 0.4750 in (cross-check) — web — Publisher's page; dimensions are facts — https://www.bearings-online.co.uk/item/1382/TIMKEN/LM11949LM11910-TIMKEN-Tapered-Roller-Bearing.html - eIndustrial Solutions (distributor): LM12749 / LM12710: bore 0.8656 in, OD 1.781 in, width 0.61 in (cross-check) — web — Publisher's page; dimensions are facts — https://www.eindustrialsolutions.com/timken-lm12749-lm12710-light-medium-duty-tapered-roller-bearing-0-8656-inch-diameter-bore-1-781-inch-od - RS Components (listing title): Timken L44649/L44610: 26.98 mm ID, 50.29 mm OD (cross-check) — web — Publisher's page; dimensions are facts — https://ph.rs-online.com/web/p/roller-bearings/1347431 - RS Components (listing title): Timken LM67048/LM67010: 31.75 mm ID, 59.13 mm OD (cross-check) — web — Publisher's page; dimensions are facts — https://th.rs-online.com/web/p/roller-bearings/1347430 - Timken (part pages with CAD views): Timken part page with dimensions and 3D / 2D CAD views for each cone, cup and set (shown here: LM67048 / LM67010) — web — Publisher's page; dimensions are facts — https://cad.timken.com/item/tapered-roller-bearings-ts-tapered-single-/tapered-roller-bearings-ts-tapered-single-imperi-2/lm67048-lm67010 No true-size file yet: the published figures do not fix the whole shape; a measured scan is planned. API: https://xemstudio.com/api/geometry?object=tapered-roller-bearings-inch-lm11949-l44649-lm67048