Thrust roller bearings use rollers as rolling elements to bear ultra-large pure axial loads, divided into two mainstream types: cylindrical thrust roller bearings and tapered thrust roller bearings. Consisting of shaft washer, housing washer and roller cage assembly, they adapt to one-way axial jacking pressure and two-way opposite axial force conditions, bearing almost no radial force. They serve as core axial pressure-bearing components for large hydraulic presses, vertical injection molding machine clamping cylinders, metallurgical mill screwdown mechanisms, heavy-duty jacks, ship rudder shafts and vertical cement mills.

Main model classification: 81100 ultra-thin compact series, 81200 standard cylindrical thrust roller series, 89300 thickened heavy-duty thrust roller series, 29400 tapered thrust roller series (large inclination angle for ultra-high axial load capacity). Models are selected according to cylinder tonnage and jacking pressure.

Compared with thrust ball bearings, thrust roller bearings adopt line-contact pressure bearing with over 3 times higher axial load capacity and prominent advantages in high-pressure extrusion resistance and impact compression resistance. Versus tapered roller bearings and cylindrical roller bearings, the force-bearing direction is dedicated, with the entire structure optimized for axial load bearing to maximize axial rigidity without structural strength waste from radial force. The main disadvantage is extremely weak radial positioning capacity, requiring matching radial positioning bearings for installation, along with low limiting speed, only suitable for low-speed high-pressure clamping and pressure-bearing working conditions.

Large hydraulic forging machines, injection molding machine clamping mechanisms and metallurgical screwdown devices operate under long-term static high pressure and frequent reciprocating jacking. Inferior thrust roller bearings suffer poor flatness on roller end faces and insufficient quenching hardness of raceway planes, leading to roller crushing and raceway concave deformation under high pressure. Thin cage structures tear and fracture under alternating axial force, increasing bearing planar clearance, resulting in insufficient mold clamping force of presses, deviation of mill roll gap accuracy and dimensional error of pressed workpieces. Consequences include mold damage, uneven rolled material thickness, hydraulic pipeline overpressure rupture, bringing huge costs for equipment repair and production scrapping.

NMT thrust roller bearings cover the full range of cylindrical thrust roller and tapered thrust roller bearings with complete specifications of 81100, 81200, 89300 and 29400, customizable single-way and two-way thrust assemblies for delivery. Manufactured with overall quenching of high-cleanliness bearing steel plus secondary strengthening quenching for raceway planes, mirror finish grinding on both ends of rollers ensures uniform force on roller ends. Super-precision flat grinding on housing washer and shaft washer raceway planes controls flatness error within micron level, with axial clearance calibration completed before delivery. Standard international mounting dimensions support direct replacement of various imported and domestic thrust roller bearings for new press assembly, injection molding cylinder maintenance and overhaul renovation of metallurgical equipment.

Hydraulic forming equipment, metallurgical rolling and heavy forging equipment are upgraded toward large tonnage, high-pressure locking and long-time pressure holding operation. Conventional thrust roller bearings feature thin hardened raceway layers, rough burrs on roller end faces and poor fatigue resistance of stamped cages. Long-term high-pressure holding causes planar collapse, edge chipping of rollers and cage fracture, failing to meet requirements of thousands-ton hydraulic presses for long-time mold clamping and continuous screwdown operation of rolling mills. The market demands heavy-duty thrust roller bearings with high planar strength, extrusion resistance and fatigue resistance.

Both ends of NMT cylindrical thrust rollers undergo double-sided precision grinding for flat end faces without stress sharp corners to avoid edge chipping under high pressure. Pressure-bearing planes of shaft washers and housing washers adopt thickened hardened layer quenching to greatly enhance plastic deformation resistance and prevent raceway indentation during prolonged high-pressure holding. Two cage options are available: high-strength stamped steel cages for conventional industrial pressure holding conditions and solid brass cages for harsh working conditions with high temperature and alternating impact pressure. Tapered thrust roller models adopt tapered roller structures for further enhanced axial load capacity, suitable for axial limit of ultra-large tonnage presses and vertical mill main shafts. Single-way bearings are used for one-side jacking limit, while two-way thrust bearings fit bidirectional opposite force structures with pre-assembled structure for direct installation on cylinder flanges.

All finished bearings pass axial static pressure resistance test, planar flatness inspection, roller end face parallelity verification and alternating load fatigue test to eliminate defective products with planar deformation and unqualified roller precision, ensuring stable high-pressure load-bearing operation of heavy-duty equipment for long periods.

Core Product Advantages

Line-contact axial pressure bearing of rollers delivers ultra-large axial load capacity to withstand static high-pressure holding of thousand-ton level.

Mirror finish grinding on both roller ends achieves uniform stress distribution to eliminate roller corner chipping failure under high pressure.

Deep quenching hardening of raceway planes with thick hardened layer resists extrusion indentation for stable dimensional performance during long-time pressure holding.

Two high-strength cage options: brass cages adapt to high-temperature alternating pressure conditions to resist fatigue fracture.

Dual categories of cylindrical thrust and tapered thrust cover full selection from small-size ultra-thin to large-tonnage heavy-duty models.

Universal standard flange mounting dimensions enable direct replacement on old and new cylinders and press bases without base modification.

Optional single-way and two-way thrust structures adapt to one-side clamping and bidirectional compression force structures.

Excellent creep resistance prevents permanent deformation under prolonged static high pressure for stable mold clamping force.

Typical Application Scenarios

Four-column hydraulic presses, forging hydraulic presses, head forming presses, powder metallurgy presses; axial support for mold clamping cylinders and injection cylinders of large horizontal/vertical injection molding machines; screwdown spindle bearings and roll axial thrust of hot rolling mills and cold rolling mills for metallurgy; axial thrust support for vertical cement roller mills and slag vertical mills; heavy-duty hydraulic jacks, ship rudder thrust bearings, valve stem thrust bearings for large valves.

Quality Assurance

NMT heavy-duty thrust roller bearings adopt exclusive heat treatment technology for planar pressure-bearing bearings: local strengthening quenching on pressure-bearing surfaces of inner and outer rings for high hardness surface against extrusion and tough matrix to buffer impact load. Overall precision grinding of cylindrical rollers plus separate polishing on both ends unifies the height of the entire roller group for even load distribution. Stress relief annealing is applied to cages to eliminate internal processing stress and prevent fatigue cracking under alternating pressure. Bearings are classified into standard clearance and tight-fit clearance according to equipment pressure holding duration; tight-fit clearance is selected for long-time pressure holding presses to reduce axial deformation. Delivered bearings feature strong planar rigidity and outstanding pressure stability for all-weather continuous high-pressure holding operation of industrial equipment.

Product Range

81100 ultra-thin cylindrical thrust roller bearings, 81200 standard cylindrical thrust roller bearings, 89300 heavy-duty cylindrical thrust roller bearings, 29400 tapered thrust roller bearings; stamped steel cages, solid brass cages; single-way thrust bearings, two-way thrust roller assemblies; standard clearance, tight-fit low-clearance models.

Brand Strength

NMT Japan addresses three common defects of ordinary thrust roller bearings: raceway indentation under high pressure, roller end face chipping and cage fatigue fracture. Upgrades including raceway planar strengthening quenching, double-sided precision grinding of rollers and high-strength cage structural optimization enhance bearing axial compression resistance, fatigue resistance and deformation resistance. We supply stable heavy-duty thrust bearings for hydraulic equipment manufacturers, injection molding machine maintenance service providers and metallurgical rolling enterprises, reducing failures such as mold clamping pressure relief of presses, accuracy drift of rolling mills and cylinder bearing damage, cutting downtime maintenance and product scrapping losses of heavy industrial equipment.