NTN K 35x42x20 Needle Roller & Cage Assembly

Product Description

The NTN K 35x42x20 needle roller & cage assembly is a precision-engineered component designed for demanding industrial applications where space is limited but high radial load capacity is required. With its slim profile — 35 mm inner diameter, 42 mm outer diameter, and 20 mm width — this roller-and-cage unit delivers excellent performance in compact assemblies.

Manufactured by NTN, a global leader in bearing technology, this component offers remarkable dynamic load capacity of 28.5 kN and static load rating of 44.5 kN, making it highly reliable under continuous heavy radial loads.

Thanks to its steel cage construction, the assembly ensures stable guidance of the needle rollers and reduces tangling or skew under load. The high-carbon chrome steel rollers provide durability and wear resistance, facilitating long maintenance intervals even in aggressive operating conditions.

The limiting speed for this assembly is 7,500 rpm under grease lubrication and up to 11,000 rpm with oil, allowing for flexible use in both low- and high-speed drives. Operating temperature ranges from -20°C to +120°C, offering robustness even in industrial thermal environments.

This needle roller set is ideally suited for industrial machinery, gearboxes, drive units, and automation systems. Its compact design helps reduce the radial footprint of your bearing assemblies while preserving excellent load-bearing capability.

Technical Specifications

• Type: Needle roller + steel cage assembly

• Model: K 35x42x20

• Brand: NTN

• Inner Diameter (d): 35 mm

• Outer Diameter (D): 42 mm

• Width (Bc): 20 mm

• Dynamic Load Rating (Cr): 28.5 kN

• Static Load Rating (C0r): 44.5 kN

• Limiting Speed: 7,500 rpm (grease), 11,000 rpm (oil)

• Temperature Range: -20°C to +120°C

• Material: High-carbon chrome steel rollers, steel cage

FAQ

Q1: What exactly is the “K 35x42x20” assembly?
A1: It is a needle roller and cage assembly — not a full sealed bearing. It consists of roller elements guided in a steel cage, designed for high radial load applications.

Q2: When should I use this component over a standard ball bearing?
A2: Use it when you need maximum load capacity with minimal radial space. Needle assemblies are ideal for compact industrial drives, gearboxes, or any machine where space is tight.

Q3: Do I need lubrication?
A3: Yes. Depending on your needs, you can use grease (for up to ~7,500 rpm) or oil (for speeds up to ~11,000 rpm).

Q4: Is this suitable for repeated start-stop applications?
A4: Yes — its steel cage and hardened rollers provide durability, but proper lubrication and correct installation are essential for long life.

Q5: What size shaft or housing do I need?
A5: This assembly requires a shaft or inner ring of 35 mm diameter and a housing bore to match 42 mm, with a radial space of 20 mm to accommodate the assembly width.