Demystifying Needle Bearing Size Chart: Your Go-To Reference for Dimensional Specifications and Comprehensive Guide

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Table of content

1. Comprehensive Guide to Needle Bearing Size Specifications and More

2. Needle Roller Bearing Types Guide

1. Comprehensive Guide to Needle Bearing Size Specifications and More

A needle bearing size chart is a reference tool that provides information about the dimensions and specifications of needle bearings.   Needle bearings, also known as needle roller bearings, are a type of roller bearing that uses cylindrical rollers with a small diameter compared to their length.   These needle rollers offer high load-carrying capacity within a small space.

The needle bearing size chart typically includes the following information

The following images are captured from the detailed specifications of bearing models provided on the ISK Bearings official website, using NK series NK7/10 as an example.

(1) Bearing Designation: This is a unique alphanumeric code or part number that identifies a specific needle bearing model.

- Standard-sized bearings usually use inner diameter (ID), outer diameter (OD), and width (W) to indicate the model of a bearing.

(2) Dimensions: The chart provides the dimensions of the needle bearing, including the inner diameter (ID), outer diameter (OD), and width or length (W or L) of the bearing.

- "dr" represents the inner diameter (ID), "D" represents the outer diameter (OD), and "B(C)" represents the width (W).

(3) Load Ratings: Needle bearings have dynamic load ratings and static load ratings.   These values indicate the maximum load a bearing can withstand under dynamic or static conditions, respectively.

- "Dynamic" represents the dynamic load rating, and "Static" represents the static load rating.

(4) Limiting Speed: This value represents the maximum rotational speed at which a needle bearing can operate without excessive heat generation or premature failure.

- "RPM" represents the limiting speed of the bearing model.

(5) Other Specifications: The chart may also include additional specifications such as the weight of the bearing, the type of cage used to retain the needle rollers, and any special features or variations of the bearing model.

- In the detailed specifications of the models provided on the ISK Bearings official website, most of them also include information such as weight and chamfering.

 Utilize the bearing search function provided by ISK Bearings immediately

It's important to note that needle bearing size charts can vary depending on the manufacturer and the specific series or design of the bearing.   Therefore, it's crucial to refer to the manufacturer's documentation or contact them directly for the most accurate and detailed information about needle bearing sizes.

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2. Needle Roller Bearing Types Guide

Needle roller bearings are bearings with cylindrical rollers whose diameter is less than their length. According to the direction of load, it can be divided into radial bearings and thrust bearings. Among them, radial bearings include: various series of stamped outer wheel type, solid type, and special purpose bolt type needle roller bearings.

(1) TA Series

Drawn cup needle roller bearing is used between the needle bearings and the bearing cage, and no axial fixture device is required. Even under the condition of high speed and heavy load, the original function of the bearing can be fully maintained, and not to be easily damaged. Due to the high storage volume of grease, the drawn cup needle roller bearing possibly without lubricating for a long time.

 TA Series PDF

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(2) HK Series

Drawn cup needle roller bearing is used between the needle bearings and the bearing cage, and no axial fixture device is required. Even under the condition of high speed and heavy load, the original function of the bearing can be fully maintained, and not to be easily damaged. Due to the high storage volume of grease, the drawn cup needle roller bearing possibly without lubricating for a long time.

 HK Series PDF

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(3) HF Series

The one-way drawn cup needle clutch bearing is greatly increased after special heat treatment. Metal springs are fitted on the plastic retainer which keeps the correct movement of the needles while the needles are used as clamping unit at the same time.

 HF Series PDF

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(4) NK Series

The solid ferrule needle roller bearing is compact in structure and small in radial size, and can withstand larger radial loads. In addition to the full complement of needle roller bearings, the other uses of a high-rigidity needle retainer is correctly guides the needle roller parallel to the axis. Accurate machining of the shaft will improve the accuracy of the entire bearing.

 NK Series PDF

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(5) NA/RNA Series

Solid drawn cup needle roller bearings are a type of bearing with a small cross-sectional height and high load-carrying capacity. Due to the high hardness of the outer ring, it can be applied to even lightweight alloy bearing seats.

 

In addition, solid drawn cup needle roller bearings are divided into two types: NA with an inner ring and RNA without an inner ring, with the latter using the shaft as the rolling surface to reduce its size.

 NA/RNA Series PDF

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(6) AXK Series

If the mounting surface of the thrust needle roller bearing is subjected to the heat treatment and grinding, it can be used as a track surface instead of the track wheel. The thrust needle roller bearing can be miniaturization and more compact, it is suitable for carrying large thrust loads and high impact, loads and high speed operation of industrial applications, and tapered roller bearings and other ball bearings, such as deep groove ball bearings, thin wall ball bearings and miniature ball bearings, they are differ in the shape of the rolling elements.

 AXK Series PDF

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(7) KT Series

Needle retainer assembly bearing has to bear a large centrifugal force, impact and vibration, working under the complicated load and high-speed rotating condition, there is a large sliding friction between the needle retainer assembly bearing and the rolling element, and a large amount of thermal energy will be generated. In the case of interaction with heat and force, it will lead to the failure of the needle retainer assembly bearing, and also cause the burn and breakage. Therefore, the needle retainer assembly bearing needs to have better thermal conductivity, wear resistance, elasticity, steel and processing technology, smaller coefficient of friction, density, proper strength and toughness fit, and the coefficient of expansion of the rolling elements.

 KT Series PDF

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(8) CF Series

Bolt roller shaft is suitable for heavier radial loads. Since the outer ring is axially guided by the roller, the bearing can also withstand heavy axial loads, allowing relatively high speed operation. However, since it is a full-loaded roller, it is necessary to replenish the grease frequently, and the lubricant can be filled through the both en ds of the mandrel and the holes in the mandrel body.

CF Series PDF

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On the whole, needle roller bearings have different designs, different series and various sizes according to the industrial equipment environment to meet various working conditions and applications.

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Further Reading: Introduction to Needle Roller Bearings and Fundamental Knowledge: Comprehensive Guide