Product Overview

The NMT HJ 306 EC is an L-shaped thrust collar (angle ring), a dedicated accessory for single-row cylindrical roller bearings. This angle ring is not a complete bearing but a separate component used in conjunction with NU or NJ type single-row cylindrical roller bearings to provide axial location for the shaft. With a bore of 30 mm, an outer diameter of 44.95 mm, a width contacting the inner ring side face of 5 mm, and a total width of 8.5 mm, it is manufactured from carbon chromium bearing steel with hardening and grinding, weighing only 0.042 kg (42 g). It belongs to the SKF HJ series angle ring product line, with NMT (Japan Enmutī) offering a fully compatible alternative that meets original manufacturer standards.

 

Model Code Decoding – Understanding NMT HJ 306 EC

Code Meaning

HJ Angle ring (L-shaped thrust collar) – axial location accessory for cylindrical roller bearings

306 Size series designation – compatible with bearings of 30 mm bore

EC Design code – indicates optimised internal design for higher load capacity

Core Value: The HJ 306 EC angle ring is a critical locating component in cylindrical roller bearing systems. When standard NJ or NUP type bearings cannot meet specific installation requirements, this angle ring can be used with NU type bearings to provide axial location in one direction, or with NJ type bearings to provide axial location in both directions. Manufactured from high-quality carbon chromium bearing steel with precision heat treatment and grinding, the NMT version ensures perfect fit and long-term reliable operation with cylindrical roller bearings.

 

Core Performance Advantages

1. Axial Location – Solving the Axial Guidance Problem of Cylindrical Roller Bearings

NU type cylindrical roller bearings have inner rings without flanges and cannot provide axial location on their own. The HJ 306 EC angle ring provides axial location in one direction when used with NU bearings. When used with NJ bearings, it provides axial location in both directions.

 

2. Simplified Design and Installation – Replacing Complex Locating Solutions

Using an angle ring can simplify bearing arrangement design and installation, particularly in the following situations:

 

When NJ or NUP type bearings are not available in the required size range

 

When an extended inner ring seating surface is needed for heavily loaded bearings

 

When simplification of bearing arrangement design and disassembly is required

 

3. High Load Capacity – Extended Inner Ring Seating Surface

The angle ring provides an extended inner ring seating surface for heavily loaded bearings, effectively improving load distribution in the locating position.

 

4. Precision Manufacturing – Ensuring Fitting Accuracy

Manufactured from carbon chromium bearing steel with hardening and grinding, the angle ring ensures precise fit with the bearing inner ring. The width contacting the inner ring side face is 5 mm with a total width of 8.5 mm. Bore tolerance is -0.012mm to 0 and outer diameter tolerance is -0.011mm to 0.

 

5. Lightweight Design – Only 42 Grams

The product weighs only 0.042 kg (42 g), adding minimal burden to rotating assemblies. The carbon footprint is 0.16 kg CO₂e.

 

6. Wide Operating Temperature Range

This angle ring operates within a temperature range of -30°C to 110°C, capable of adapting to various demanding environments. It is compliant with RoHS and REACH environmental standards.

 

7. Clear Performance Specifications

 

Parameter Value

Bore d 30 mm

Bore Tolerance -0.012mm to 0

Outer Diameter d₁ 44.95 mm

OD Tolerance -0.011mm to 0

Width Contacting Inner Ring Side Face B1 5 mm

Total Width B2 8.5 mm

Width Tolerance -0.12mm to 0

Radial Chamfer r₃,₄ min. 1.1 mm

Material Carbon Chromium Bearing Steel

Heat Treatment Hardened and Ground

Weight 0.042 kg (42 g)

Carbon Footprint 0.16 kg CO₂e

Temperature Range -30°C to 110°C

Companion Bearing Selection Guide

The HJ 306 EC angle ring is typically used with the following types of cylindrical roller bearings:

 

With NU type bearings:

 

NU 306 EC series cylindrical roller bearings

 

Provides unidirectional axial location

 

With NJ type bearings:

 

NJ 306 EC series cylindrical roller bearings

 

Provides bidirectional axial location

 

Important Installation Notes

✅ This angle ring is a separate component and must be installed together with NU or NJ type cylindrical roller bearings.

 

✅ Ensure the angle ring bore (30 mm) provides a tight fit with the bearing inner ring.

 

✅ The angle ring total width (8.5 mm) should match the bearing inner ring width.

 

⚠️ This angle ring is not a direct substitute for bearings with integral flanges (such as NUP type) – selection should be based on specific design requirements.

 

⚠️ Pay attention to the directionality of the angle ring during installation – the L-shaped structure should face the direction requiring axial location.

 

✅ Installation in a clean environment is recommended to prevent contaminant ingress that could affect performance.

 

NMT Quality Commitment

Japan NMT (Enmutī) has deep expertise in the precision bearing industry, with breakthroughs in material purification, process refinement, scenario customisation, and intelligent upgrading, transforming precision bearing accessories into core solutions addressing pain points across multiple industries. The NMT HJ 306 EC angle ring is manufactured to strict Japanese quality standards – from material selection (high-purity carbon chromium bearing steel) to heat treatment and grinding processes. The combination of precision angle ring design, high-quality bearing steel, precision grinding, and lightweight construction makes this product the flagship offering in the NMT cylindrical roller bearing accessories series – delivering the perfect balance of precise positioning and reliable durability.

 

Choose NMT HJ 306 EC for:

 

✅ Precise axial location – solving the axial guidance problem of NU/NJ bearings

 

✅ High-quality bearing steel – hardened and ground for durability

 

✅ Lightweight design – only 42 g

 

✅ Easy installation – simplifying bearing arrangement design

 

✅ High load capacity – extending inner ring seating surface

 

✅ Wide temperature range – -30°C to 110°C

 

✅ RoHS and REACH compliant

 

✅ Japanese precision manufacturing quality