INASL182968-TB-BRFull-Complement Cylindrical Roller Bearing – 340 mm Bore, 460 mm OD, 72 mm Width, Semi-Locating, CN Clearance

Product Description

What this part is

INA SL182968-TB-BR single-row full-complement cylindrical roller bearing, semi-locating, type SL18. Bore / Shaft Size: 340 mm, 13.386 in. Outside Diameter: 460 mm, 18.110 in. Overall Width: 72 mm, 2.835 in. Dynamic Load Rating: 1,250,000 N. Static Load Rating: 2,470,000 N. Fatigue Load Limit: 270,000 N. Limiting Speed: 770 rpm. Reference Speed: 460 rpm. Weight: 33.71 kg. Internal Clearance: CN. Precision Class: PN, normal to ISO 492:2023. Bore Type: cylindrical. Cage Type: full complement, no cage. Number Of Rows: 1. Rolling Elements: cylindrical rollers. Closure Type: open. Operating Temperature: –30 °C to 120 °C. Design Units: Metric.

Decoding the designation

SL18 — Schaeffler’s full-complement cylindrical roller bearing type, solid inner and outer rings, one rib on the outer ring and two on the inner ring.

29 — the dimension series, which sets the 460 mm outside diameter and 72 mm width over a 340 mm bore.

68 — the bore code: 68 x 5 gives the 340 mm bore.

TB — the increased axial load capacity execution.

What these specs mean in practice

Removing the cage fills the ring gap with rollers, and that is where the 1,250,000 N dynamic and 2,470,000 N static ratings come from on a 60 mm radial section. The cost is speed: with the rollers touching each other, sliding friction sets the Limiting Speed at 770 rpm and the Reference Speed at 460 rpm, well below a caged bearing of this diameter.

One rib on the outer ring and two on the inner make it a semi-locating bearing. It takes radial load plus axial load in one direction and allows 5 mm of axial displacement in the other, so a long shaft can be located at one end and left free to grow at the other without pushing thrust back through this position. The TB design raises the axial capacity of that single-direction location.

Internal Clearance: CN is the normal group. On a bearing of this size the clearance is consumed by the shaft interference fit and by the temperature difference between the rings, which is why the standard group is specified against a standard fit.

Quantity and configuration

Unit Quantity: 1 Pc.

Mounting data

Shaft seat 340 mm; housing bore 460 mm; seat length 72 mm. Minimum diameter of shaft shoulder da min: 379 mm. Minimum shaft shoulder dc min: 379 mm. Maximum diameter of housing shoulder Da max: 418.5 mm. Minimum diameter of housing shoulder De min: 430 mm. Maximum recess radius ra max: 3 mm. Minimum chamfer dimension r min: 3 mm. Raceway diameter of the outer ring E: 430.2 mm. Maximum rib diameter of the inner ring d1: 379 mm. Minimum rib diameter of the outer ring D1 min: 418.7 mm. Axial displacement s: 5 mm. Weight 33.71 kg.

Interchange guidance

Schaeffler lists SL182968-TB, SL182968-TB-BR-C3 and SL182968-TB-C3 on the same 340 x 460 x 72 mm envelope. The C3 executions carry greater radial internal clearance than the CN of this part, so they are related sizes rather than like-for-like swaps. Bearing Material: chrome steel.