INARNA4905RSNeedle Roller Bearing – 30 mm Bore, 42 mm OD, 17 mm Width, Lip Seal One Side, No Inner Ring

Product Description

What this part is

INA RNA4905RS machined needle roller bearing to DIN 617 / ISO 1206. The outer ring, needle rollers and cage form one non-separable assembly and the rollers bear directly on the shaft, so the shaft seat is the inner raceway. Bore Diameter: 30 mm (roller bore, Fw). Outside Diameter: 42 mm. Overall Width: 17 mm. Dynamic Load Rating: 21,800 N. Static Load Rating: 24,200 N. Limiting Speed: 8,600 rpm grease. Rolling Elements: Needle Roller. Number Of Rows: 1. Bore Type: Straight. Closure Type: Lip seal one side. Cage Material: Pressed steel. Item Weight: 0.062 kg (0.14 lb). Series: RNA49. Base Number: RNA4905.

Decoding the designation

RNA — machined needle roller bearing supplied as an outer ring and needle roller assembly, running on the shaft. The matching NA execution of the same number carries a separable inner ring.

49 — dimension series 49, the light section within the DIN 617 needle roller range.

05 — size code; 30 mm roller bore in this series.

RS — contact lip seal on one side, the opposite face open. Schaeffler’s current code for the same execution is RSR.

XL — Schaeffler’s current-generation designation. RNA4905-XL supersedes RNA4905 in the catalogue.

What these specs mean in practice

A 6 mm radial wall section carrying 21,800 N dynamic is the reason needle bearings exist: a 30 x 42 mm deep groove ball bearing in the same envelope would be a fraction of that. The trade is speed and the requirement for a hardened shaft raceway.

The lip seal caps the limiting speed at 8,600 rpm and the maximum operating temperature at 100 °C, and it retains grease in positions with no external lubrication supply. Fatigue load limit: 4,650 N.

Operating temperature range: −20 °C to 100 °C.

Mounting data

Shaft raceway: ground and hardened to 670 HV or better, with the same tolerance treatment as a bearing inner ring. Minimum chamfer dimension: 0.3 mm.

Where the shaft cannot be hardened, the NA4905 execution of the same size carries its own inner ring.

Quantity and configuration

Unit Quantity: 1 Pc. Single bearing, straight bore, one lip seal.

Interchange guidance

RNA4905 is a DIN 617 / ISO 1206 standard number, so the 30 x 42 x 17 mm envelope is shared across the needle bearing makers and the base designation is the same at each. Seal suffixes differ by maker. GTIN: 035373109944. Designation variants: RNA 4905 RS, RNA4905RSR, RNA4905-RSR-XL.