TimkenNA14138/14276DDouble-Row Tapered Roller Bearing Assembly (TNA) – 1.3750 in Bore, 2.7170 in Outside Diameter, 1.8126 in Width, 3 Pcs

Product Description

What this part is: Timken NA14138/14276D double-row tapered roller bearing, TNA type — Tapered Double, non-adjustable. Cone Part Number: NA14138. Cup Part Number: 14276D. Rolling Elements: Tapered Roller. Number Of Rows: 2. Bore Type: Straight. Design Units: Imperial. Bore Diameter: 1.3750 in (34.925 mm). Outside Diameter: 2.7170 in (69.012 mm). Overall Width (T): 1.8126 in (46.04 mm). Outer Ring Width (C): 1.5000 in (38.1 mm). Series: 14000. Bearing Material: Case-Carburized Steel. Harmonization Code: 8482.20.00. Decoding the designation: NA — a cone furnished for two-row service, with the front face extended so the two cones abut one another and set the internal clearance without a separate inner ring spacer. 14138 — the cone base number, a 14000-series inch tapered roller cone on a 1.3750 in bore. 14276 — the cup base number, giving a 2.7170 in outside diameter. D — a double cup: one outer ring carrying two raceways, taking two cones back to back. TNA — Timken’s double-row non-adjustable construction, supplied with built-in clearance to a standard setting range. Precision Class: Not specified. Timken marks Class 3 with an explicit –3, *3 or #3 and Class 2 with an explicit –2; neither marking is carried here. What these specs mean in practice: Dynamic Load Rating (C1): 95,100 N (21,400 lbf). Dynamic Radial Load Rating single row (C90): 14,200 N (3,180 lbf). Dynamic Radial Load Rating two-row (C90-2row): 24,600 N (5,540 lbf). Dynamic Axial Rating (Ca90): 9,260 N (2,080 lbf). K Factor: 1.53. A K factor of 1.53 is steeper than the common 1.9 group, which raises the thrust share the bearing carries for a given radial load. e Factor: 0.38. Y1 Factor: 1.77. Y2 Factor: 2.63. Two Y factors are published because a double-row bearing carries thrust through one row at a time. Two rows seated in one double cup take thrust in both directions and carry a moment load, so a single TNA position locates a shaft that would otherwise need two opposed single-row bearings. Item weight: 0.7 kg (1.56 lb). Mounting data: Max Shaft Fillet Radius: 0.140 in (3.5 mm). Max Housing Fillet Radius: 0.03 in (0.8 mm). Shaft Backing Shoulder Diameter, backface (db): 1.81 in (46 mm). Housing Backing Shoulder Diameter, frontface (Da): 2.52 in (64 mm). The extended cone front faces abut inside the assembly, so the bearing sets itself on assembly and the clearance comes from the factory. Quantity and configuration: Double cup and two cones, 3 Pcs. Unit Quantity: 3 Pcs. The listing carries two NA14138 cones and one 14276D double cup, which is the full TNA assembly as Timken builds it. Interchange guidance: Interchange runs on the Timken designation itself: NA14138/14276D. The 14276D double cup and the TNA double-row construction are Timken catalogue items, and the trade orders them under the Timken number. MPN Variants: NA14138/14276D, NA14138-14276D, NA14138 14276D, 14138/14276D, 14276-D.