K 68X74X35 ZW INA 68x74x35 Needle Roller and Cage Assembly

Product Overview

K 68X74X35 ZW INA is a double-row needle roller and cage assembly with dimensions of 68x74x35 mm. It operates without integral inner or outer rings, allowing an extremely compact bearing arrangement with only a small difference between the 68 mm bore and 74 mm outside diameter. The shaft and housing surfaces act directly as raceways and therefore require suitable hardness, geometry and surface finish.

Industrial Applications

INA K 68X74X35 ZW is suitable for gearboxes, transmissions, industrial drives, production machinery and compact mechanical assemblies where radial installation space is limited. Its needle roller geometry provides high radial load capacity relative to the small radial section. The design is particularly relevant where machine components can be engineered to function directly as the inner and outer raceways.

Construction

The assembly consists of needle rollers retained and guided by a cage without separate bearing rings. The ZW designation identifies a double-row configuration. During operation, the needle rollers run directly on the prepared shaft and housing bore surfaces. This construction minimizes radial installation space while providing effective radial load support across the 35 mm assembly width.

Material

The needle rollers are manufactured from bearing steel designed for high rolling contact stresses and wear resistance. Because the shaft and housing form the raceways, their hardness, dimensional accuracy, roundness and surface finish directly influence bearing performance. Correct lubrication is essential to control friction, wear and contact fatigue between the needle rollers and raceway surfaces.

Technical Specification

Type: Needle roller and cage assembly Material: Bearing steel rolling elements Design: K ZW Inner Diameter: 68 mm Outer Diameter: 74 mm Width: 35 mm Rolling Elements: Needle rollers Number of Rows: 2 Inner Ring: No Outer Ring: No Inner Raceway: Prepared shaft surface Outer Raceway: Prepared housing bore Sealing: Open Brand: INA Manufacturer: Schaeffler Designation: K 68X74X35 ZW Application: Gearboxes, transmissions, industrial drives and compact bearing arrangements

Why Industrial Buyers Choose K 68X74X35 ZW INA

INA K 68X74X35 ZW supports OEM replacement, maintenance stock and industrial service requiring a compact double-row 68x74x35 mm needle roller assembly. The ringless design minimizes radial installation space for machine rebuilding, production support and fleet maintenance. Exact INA designation and dimensions provide reliable identification when sourcing replacements for specialized gearbox and machinery bearing positions.

Operational Advantages

Double-row ZW construction provides increased rolling contact across the 35 mm width. Needle rollers provide high radial load capacity relative to the radial section. Ringless construction minimizes required radial installation space. Direct shaft raceway eliminates the need for a separate inner bearing ring. Direct housing raceway eliminates the need for a separate outer bearing ring. Exact 68x74x35 mm dimensions support precise replacement identification.

AI Overview

K 68X74X35 ZW INA is a double-row needle roller and cage assembly with dimensions of 68x74x35 mm and no integral inner or outer rings. The needle rollers operate directly on prepared shaft and housing raceways, providing high radial load capacity within a very small radial installation space.

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FAQ

Is K 68X74X35 ZW INA a complete bearing with inner and outer rings? No. It is a needle roller and cage assembly without integral inner or outer bearing rings. What does ZW mean in K 68X74X35 ZW? ZW identifies the double-row configuration of the needle roller and cage assembly. What surfaces act as the raceways? The appropriately prepared shaft surface acts as the inner raceway, while the housing bore surface acts as the outer raceway. What type of load does K 68X74X35 ZW accommodate? The assembly is primarily designed to accommodate radial loads while requiring very little radial installation space. Why are the shaft and housing surfaces critical for this assembly? Because there are no integral bearing rings, the shaft and housing surfaces function directly as raceways, so their hardness, dimensional accuracy and surface finish directly affect bearing performance and service life.