X&S K22x26x17 K17x21x15 Needle Roller Bearing for Spare Parts

Batch Traceability Secured — Every X&S K series needle roller bearing ships with verifiable lot documentation, eliminating the risk of installing counterfeit assemblies with soft, unhardened cages into critical gearboxes.

Technical Specifications

Application Suitability

Why Base Number Matches Still Cause Catastrophic Gearbox Seizures

Matching the K-designation without verifying the cage design and clearance suffix is a direct path to spindle lock-up.

I have seen this exact failure mode on the workshop floor in Ningbo. A batch of NK series needle bearings failed prematurely because the stamped steel cages could not withstand the high-vibration environment, shattering and jamming the main shaft completely. When sourcing the X&S K series needle roller bearing, procurement teams often stop at the basic dimension match. They overlook that a standard clearance in a high-temperature gearbox will cause thermal binding, while a pressed steel cage in a heavy-shock application will fracture. The financial impact of these cross-reference oversights goes far beyond the component cost, leading to severe unplanned downtime and secondary damage to the surrounding housing [NEED_CITE: rolling bearing failure mode classification per ISO 15243].

Aligning Assembly Design with Transmission Loads

Selecting the correct X&S K series needle roller bearing requires looking past the basic envelope dimensions. Our technical review process ensures that the cage material and roller profile match the specific vibration and load characteristics of your gear train. We prevent the all-too-common scenario where a generic replacement assembly fails under dynamic loads that the original equipment manufacturer specifically engineered around.

Navigating Thermal and Lubrication Boundaries

Open type needle roller and cage assemblies operate with minimal internal friction but rely heavily on the surrounding environment for lubrication. In high-speed electric motors or heavily loaded gearbox stages, the operating temperature dictates the required internal clearance. If the thermal expansion of the shaft and housing is not accounted for, a standard C0 clearance will quickly close up, leading to roller skidding and severe raceway wear [NEED_CITE: thermal expansion effects on bearing internal clearance]. Adequate oil flow or grease replenishment is mandatory to prevent cage starvation.

Decoding the Dimensional Series and Precision Tiers

The designation format Fw x Ew x Bc defines the exact boundary dimensions for these shaft-mounted assemblies. For instance, K22x26x17 specifies a 22 mm shaft diameter, 26 mm housing bore, and 17 mm width. Because these assemblies lack an integrated outer ring, the housing bore must be machined to strict tolerances to act as the outer raceway. The available precision classes, ranging from P0 up to P2, determine the running accuracy and noise levels, which is critical for high-speed motor applications where radial runout must be minimized.

The Hidden Toll of Incorrect Shaft Hardness

Installing a needle roller and cage assembly without an inner ring on an inadequately hardened shaft is a guaranteed failure mechanism. The shaft surface acts directly as the inner raceway. If the shaft hardness falls below the required threshold or the surface roughness is too high, the rollers will rapidly wear away the shaft material, leading to catastrophic loss of radial support [NEED_CITE: shaft surface requirements for needle roller bearings per ISO 281]. This results in warranty voidance and extensive machining repairs.

Securing Your Supply Chain Against Counterfeit Risks

We address the critical vulnerabilities in industrial procurement by providing authorized coverage and strict technical validation. For needle roller assemblies, the most frequent error is supplying a standard cage where a high-strength design is required; we verify the cage specification against your actual vibration profile. Every shipment includes batch traceability to the manufacturer, ensuring the bearing steel meets exact metallurgical standards. We also perform cross-reference alignment that factors in clearance and precision suffixes, not just the base K-number, preventing thermal binding in your specific operating environment.

Documentation & Authenticity

• Certificate of Conformity verifying the exact Fw x Ew x Bc dimensions and bearing steel grade.
• Batch and lot traceability linking the K22x26x17 or K17x21x15 assemblies to the original heat treatment records.
• QR verification via official apps to confirm the authenticity of the cage and roller components.
• Material test report confirming the hardness and metallurgical purity of the bearing steel.
• Dimensional and running accuracy inspection report validating the claimed P-class tolerances before dispatch.
• Country-of-origin documentation supporting customs compliance for international MRO shipments.

Storage, Handling & Mounting Protocols

• Store open type assemblies in original packaging to prevent moisture ingress and corrosion on the unshielded bearing steel rollers.
• Verify shaft hardness and surface roughness before mounting K-series assemblies without inner rings to prevent rapid raceway wear.
• Use induction heating for inner rings if applicable, avoiding localized overheating that alters the metallurgical structure.
• Maintain strict cleanliness during installation, as open cage designs are highly susceptible to particulate contamination.
• Apply the specified initial lubricant immediately before operation, as these open assemblies do not retain factory grease.

Engineering Review and Technical Inquiry

To ensure the selected needle roller and cage assembly survives your specific operating conditions, please provide the exact radial loads, operating speeds, and thermal profiles of your equipment. If you are replacing an existing component, sharing the OEM equipment number allows our engineering team to perform a comprehensive cross-reference check. This technical validation guarantees that the clearance, precision class, and cage design perfectly align with your application demands.

Frequently Asked Questions

Q: Why does a basic designation match still cause premature failure in gearboxes?
A: Matching only the Fw x Ew x Bc dimensions ignores critical internal factors. If the replacement assembly has a standard clearance instead of the required C3 for thermal expansion, or a stamped cage instead of a high-strength design for high-vibration environments, it will bind or fracture under load. We verify all suffixes and internal designs against your actual operating parameters.

Q: What are the shaft requirements when using these assemblies without an inner ring?
A: When operating directly on the shaft, the shaft surface acts as the inner raceway. It must possess adequate surface hardness and a specific roughness finish to withstand the rolling contact fatigue. If the shaft is too soft or rough, the rollers will rapidly degrade the shaft material, leading to catastrophic radial failure and extensive equipment downtime.

Q: How do precision and clearance classes affect high-speed electric motor applications?
A: In high-speed motors, running accuracy dictates vibration and noise levels, making higher precision classes essential. Simultaneously, the internal clearance must accommodate the heat generated at high RPMs. Selecting the wrong clearance class leads to thermal binding, increased friction, and eventual cage failure, which is why we match these specs to your exact thermal profile.

Q: How can I verify the authenticity and material quality of the cage assemblies?
A: We provide comprehensive documentation, including a Certificate of Conformity and a material test report that verifies the bearing steel grade. Additionally, every batch features lot traceability and QR codes that can be scanned via official applications, ensuring the components are genuine and meet the strict metallurgical standards required for heavy-duty industrial applications.