1. Industry Working Condition Pain Points

In industrial equipment such as crane hooks, robot Z-axis modules, oil drilling rigs, vertical water pumps and steelmaking equipment, bearings must withstand enormous unidirectional axial loads and frequent impact vibration. Traditional thrust ball bearings feature point contact between balls and raceways under heavy loads, causing highly concentrated contact stress that produces indentations and early fatigue spalling. The balls also experience differential sliding under centrifugal force, exacerbating wear and heat generation.

 

Domestic thrust cylindrical roller bearings commonly suffer from insufficient roller crowning control, high end-face roughness and weak cage strength, leading to roller misalignment, rib cracking and cage fracture under heavy loads. Imported thrust cylindrical roller bearings offer excellent performance but have long procurement cycles and high prices, making mass replacement in production lines cost-prohibitive. More critically, many equipment have extremely limited axial installation space, and traditional thrust ball bearings cannot provide sufficient load capacity within such confined spaces.

 

In robot Z-axis modules, thrust bearings must withstand repeated axial impacts and long-term holding loads during frequent start-stop lifting motions. In crane hooks, bearings must bear hanging weights of several tons to dozens of tons and sudden impacts. In oil drilling rigs, drill pipes endure enormous thrust forces and alternating loads thousands of metres underground. Ordinary bearings cannot meet these demanding requirements, making professional thrust cylindrical roller bearings with high axial rigidity, strong load capacity, excellent impact resistance and compact installation space urgently needed.

 

2. Product Core Positioning

Developed with Japanese heavy-duty bearing design experience, NMT thrust cylindrical roller bearings focus on unidirectional axial heavy-load conditions. With cylindrical roller and raceway line contact as the core, the contact mode between rolling elements and raceways is expanded from point to line, greatly raising the upper limit of axial load capacity, with overall axial rigidity far exceeding thrust ball bearings.

 

Rollers are convex-crowned to optimise contact pressure distribution, effectively eliminating edge stress concentration and improving axial load capacity and rigidity. The slightly convex spherical end-face profile transforms contact from sliding friction to a mixed lubrication mode, significantly reducing rib friction and heat generation. The separable design allows shaft washers, housing washers and roller-cage assemblies to be mounted independently, facilitating bearing maintenance, separate replacement of damaged parts and on-site repair of large equipment.

 

NMT has深耕 materials and heat treatment processes, employing a differentiated heating strategy—raceway surfaces are rapidly heated to austenitising temperature and then quenched, while the core undergoes a relatively温和 phase transformation, forming a uniform hardened layer with low retained austenite content. Through a process called "gradient carburising" heat treatment, NMT has re-examined the balance of raceway hardness and toughness, improving load capacity and impact resistance without increasing roller diameter. NMT pushes roller diameter and quantity to the structural limit, creating a dense load-carrying matrix within limited axial space.

 

3. Structural Classification & Functional Advantages

(1) Single-Row Thrust Cylindrical Roller Bearing

 

Single-row structure capable of carrying axial load in only one direction and limiting axial displacement in one direction. Simple structure, strong load capacity and high axial rigidity. Suitable for crane hooks, vertical water pumps, jacks, oil drilling rigs and other unidirectional axial heavy-load applications.

 

(2) Double-Row Thrust Cylindrical Roller Bearing

 

Double-row structure capable of carrying bidirectional axial loads and limiting axial displacement in both directions. Higher load capacity within the same axial space, suitable for applications requiring alternating axial loads.

 

(3) Multi-Row Thrust Cylindrical Roller Bearing

 

Three-row, four-row and composite types for extreme axial heavy-load applications. Suitable for large metallurgical equipment, heavy-duty gearboxes, marine propulsion systems and other equipment with extreme axial load requirements.

 

General advantages summary: Line-contact load carrying with axial capacity far exceeding thrust ball bearings of the same size; extremely low axial section height achieving high load capacity within limited axial space; separable design for easy installation and maintenance with interchangeable shaft washers, housing washers and roller-cage assemblies; convex-crowned rollers optimising contact pressure distribution; multiple cage options including machined brass and stamped steel.

 

4. Two-Grade Material & Process Selection

Grade 1: Through-Hardened Bearing Steel (General Version)

 

Integral quenching and low-temperature stabilizing tempering achieve uniform raceway hardness and excellent roller wear resistance. Suitable for conventional industrial motors, vertical water pumps, jacks, general industrial robot Z-axis modules and other continuous stable axial load conditions, with outstanding cost performance for complete machine supporting.

 

Grade 2: Carburized Bearing Steel (Heavy-Duty Reinforced Version)

 

Inner rings, outer rings and rollers undergo gradient carburising heat treatment—raceway surfaces are rapidly heated to austenitising temperature and then quenched, while the core undergoes a relatively phase transformation, forming a gradient structure with high surface hardness for wear resistance and a tough core for impact resistance. Applied to crane hooks, oil drilling rigs, hot rolling mills, heavy-duty robot Z-axes and other impact-type axial load conditions, withstanding instantaneous peak loads to prevent raceway crushing and roller fracture, with significantly extended service life under extreme conditions.

 

5. Japanese Precision Manufacturing Process

Vacuum degassing refining of high-purity special steel forging, controlling non-metallic inclusions to extremely low levels and eliminating fatigue crack initiation points;

 

Precision forging + gradient carburising heat treatment, achieving uniform hardened layers on raceway surfaces with a strong tough core;

 

Roller crowning machining—precise control of crowning profiles to optimise raceway contact pressure distribution and eliminate edge stress concentration;

 

Slightly convex spherical end-face machining and mirror polishing of rollers—precise control of roller end-face roughness to form a stable elastohydrodynamic oil film in the contact zone;

 

Superfinishing grinding of inner and outer raceways for stable lubricating oil film formation;

 

Group matching of rollers with micron-level dimensional tolerance control for uniform load distribution;

 

Precision cage machining—machined brass cages or stamped steel cages available;

 

Assembly in temperature-controlled dust-free workshops, with four full inspections before delivery: load test, temperature rise test, axial clearance test and noise test.

 

All dimensions comply with national standards for direct interchange with mainstream thrust cylindrical roller bearings.

 

6. Installation and Usage Precautions

NMT thrust cylindrical roller bearings must carry pure axial loads and should not be subjected to any radial loads. Thrust bearings are inherently not good at handling radial forces and tilting moments. In equipment requiring both vertical lifting and horizontal eccentric loads, they must be precisely matched with a set of radial bearings. NMT provides detailed adjacent part tolerance recommendations in product manuals, including housing bore cylindricity, mounting end-face runout and coaxiality requirements between the two bearings. The separable design allows shaft washers, housing washers and roller-cage assemblies to be mounted independently, enabling bearing replacement without disassembling the entire main shaft during large equipment maintenance.

 

7. Wide Application Fields

Lifting & Hoisting Equipment: Crane hooks, tower crane slewing mechanisms—withstanding hanging weights of several tons to dozens of tons and axial impacts;

Industrial Robots: Z-axis modules, end-effector press cylinders—axial impacts during high-speed lifting and long-term holding loads;

Oil Drilling & Extraction Equipment: Oil drilling rigs, swivels—enormous thrust forces and alternating loads thousands of metres underground;

Metallurgical Equipment: Steelmaking and steel rolling equipment, rolling mill roll necks—high-rigidity axial support during heavy-load continuous operation;

General Machinery: Vertical water pumps, jacks, large hydraulic cylinders—stable load carrying under long-term unidirectional axial loads;

Heavy-Duty Gearboxes: High-power marine gearboxes, vertical motors—high axial rigidity transmission requirements;

Renewable Energy Equipment: Wind turbine main shafts—axial support requiring greater thrust applications;

Construction Machinery: Extruders, shield machine propulsion systems—durable operation under repeated impact loads.

 

8. Brand Supply & Customisation Service

NMT maintains sufficient spot inventory of mainstream thrust cylindrical roller bearing specifications for urgent equipment repair and mass complete machine supporting with short lead time. Customisation services include special axial clearance, high/low temperature resistant materials, special grease, non-standard sizes, copper alloy/stamped steel cage selection, single-row/double-row/multi-row structural customisation and more. Professional engineers provide targeted selection schemes based on main shaft axial load spectrum, impact frequency, installation space and operating temperature to optimise bearing configuration, improve axial rigidity, control axial displacement, extend equipment maintenance intervals and cut the overall life cycle cost of equipment.