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Rolling mill bearings

Double-Direction Angular Contact Thrust Ball Bearings

A Double-Direction Angular Contact Thrust Ball Bearing (DDAC TBB) is a super-precision bearing designed to handle heavy axial (thrust) loads in both directions, providing high stiffness and precise shaft location, commonly used with cylindrical roller bearings in machine tool spindles for applications like grinding, milling, and lathes. They typically have a large contact angle (often 60°) for rigidity and consist of two single thrust bearings back-to-back, allowing them to support axial forces while not supporting radial loads, enabling simpler housing designs.

Metric Series:Inner Diameter: 140–400 mm； Outer Diameter: 190–540 mm；Width: 60–164 mm； Weight: 135–693 kg.

Materials:Bearing Rings & Rolling Elements: High-grade Chrome Steel, Customized Materials；

Cages: Special materials suitable for high-speed operation and load requirements.

Delivery:Standard models: Determined based on order quantity negotiation；

Customized models: Please contact the manufacturer.

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Techspecs

Boundary dimensions							Basic load ratings		Designations	Mass	Limiting speeds
mm							kN			kg	r/min
d	D	T	C	B	rmin	r1min	Ca	Coa		kg	Grease	oil
140	190	60	30	15	1.5	1	91.5	365	234928	4.2	2000	2800
	210	84	42	21	2.1	0.6	145	525	234428	8.75	1800	2600
150	210	72	36	18	2	1	116	465	234930	6.6	1800	2400
	225	90	45	22.5	2.1	0.6	172	620	234430	10.7	1700	2400
160	220	72	36	18	2	1	118	490	234932	7	1700	2400
	240	96	48	24	2.1	0.6	185	680	234432	13	1600	2200
170	230	72	36	18	2	1	120	520	234934	7.35	1600	2200
	260	108	54	27	2.1	0.6	218	810	234434	17.7	1500	2000
180	250	84	42	21	2	1	158	655	234936	10.7	1500	2000
	280	120	60	30	2.1	0.6	281	1020	234436	23.4	1400	1900
190	260	84	42	21	2	1	161	695	234938	11	1400	2000
	290	120	60	30	2.1	0.6	285	1060	234438	24.4	1300	1800
200	280	96	48	24	2	1	204	855	234940	15.7	1300	1800
	310	132	66	33	2.1	0.6	315	1180	234440	31.5	1200	1700
220	300	96	48	24	2	1	210	930	234944	17	1200	1700
	340	144	72	36	3	1	360	1390	234444	41	1100	1500
240	320	96	48	24	2	1	213	980	234948	18.3	1100	1500
	360	144	72	36	3	1	360	1450	234448	44	1000	1400
260	360	120	60	30	2	1	315	1390	234952	30	1000	1400
	400	164	82	41	3	1.5	440	1890	234452	64.5	900	1300
280	380	120	60	30	2	1	320	1470	234956	33.5	900	1300
	420	164	82	41	3	1.5	440	1960	234456	68	850	1200
300	420	144	72	36	3	1	395	1810	234960	53	850	1200
320	440	144	72	36	3	1	405	1920	234964	55.5	800	1100
340	460	144	72	36	3	1.1	415	2020	234968	58.5	750	1000
360	480	144	72	36	3	1.1	420	2130	234972	61.5	710	950
380	520	164	82	41	4	1.5	485	2560	234976	87.5	630	900
400	540	164	82	41	4	1.5	495	2700	234980	91.5	600	850

Description

Design Principles:Adopts three-ring + double ball-cage assembly structure, with the shaft washer separating the two rolling assemblies to achieve stable transmission of bidirectional axial loads; the angular contact design optimizes load distribution, reduces contact friction, and improves operational efficiency；The separable structure design simplifies the installation, dismounting and inspection processes and enhances component interchangeability; supports customized solutions such as size and material according to different working condition requirements to adapt to diverse industrial scenarios. Performance Features:Bidirectional Load Capacity: Specifically designed to bear bidirectional axial thrust loads, with stable load-bearing performance, suitable for scenarios where the load direction changes frequently； Ultra-High Precision: High-precision manufacturing process ensures smooth operation with minimal vibration, guaranteeing equipment processing or operational precision； Strong Durability: Uses high-quality materials and optimized structure, withstands harsh working conditions (high temperature, vibration, impact), reduces replacement frequency, and extends equipment service life；Easy Maintenance: The separable design facilitates daily inspection, maintenance and component replacement, reducing operation and maintenance costs.

Features

Quality Assurance: Over 30 years of industry experience, more than 50 invention patents, ISO9001/ISO14001 certifications, performance meeting international high standards with strong reliability；

Strong Customization Capability: Professional team provides personalized solutions, tailored to working conditions and user needs, optimizing equipment adaptability and operational efficiency；

Working Principle

Roller Arrangement and Load Distribution:Rolling elements (steel balls) roll at high speed between the precision raceways of the inner and outer rings, uniformly transmitting bidirectional axial loads through the angular contact structure to reduce friction loss; the cage guides the rolling elements to move in an orderly manner, avoiding mutual collision, reducing operational temperature rise, and ensuring stability at high speeds; high-precision manufacturing and tolerance control ensure precise component matching, preventing operational deviation and vibration.

Application & Case

1、Machine Tool Spindles: Used in CNC machines where the spindle may experience axial loads in both directions.

2、Automotive Transmissions: In automotive applications, such bearings are used in gearboxes and transmissions to handle high axial loads.

3、Turbines and Pumps: For applications where axial forces are common, such as in turbines, pumps, or motors.

4、Heavy Equipment: Used in equipment where the load is applied along the shaft, like cranes, excavators, and other industrial machinery.

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What is a Spindle Bearing?

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FAQ

What is the core difference between double-direction angular contact thrust ball bearings and ordinary thrust bearings?

The core difference lies in bidirectional load-bearing capacity and separable design: double-direction angular contact thrust ball bearings can bear axial loads in two directions simultaneously, and adopt a separable structure for easy installation, dismounting and interchangeability; ordinary thrust bearings are mostly unidirectional load-bearing, some structures are difficult to disassemble and assemble, and their precision and high-speed performance are not as good as this product.

Which industries benefit the most from these bearings?

The metallurgical and mining industries benefit the most, as their equipment often faces harsh working conditions such as bidirectional axial loads, high temperatures, vibrations and heavy loads. The bidirectional load-bearing, high durability and easy maintenance characteristics of this bearing can accurately match the needs; it is also applicable to the industrial machinery field that requires high load-bearing capacity and precision.

Can these bearings be customized?

Yes. It can be customized in terms of size (inner diameter, outer diameter, width), material (such as special high-temperature resistant and corrosion-resistant materials) and lubrication scheme according to specific needs to adapt to equipment operation requirements under different working conditions.

How often should the bearings be replaced?

CNC Machinery

Precision Bearings

Non-standard Machinery Parts

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