1 Model Information & Technical Parameters

Model：BTW 130 CTN9/SP

Dimensions

Bore d：130 mm

Outer diameter D：200 mm

Height H：84 mm

Contact angle：60°

Number of rows：2 rows of balls

Axial load capacity：Bidirectional

Housing washer type：Two-piece design for double row angular contact thrust ball bearing

Outer ring locating shoulder：None

Re-lubrication facility：Not available

Accuracy class: SP precision grade

Structure series: Heavy-duty BTW series

Seal: Open design, no seals

Surface coating: Uncoated

Pre-lubrication: No lubricant supplied from factory

Code Explanation

BTW: Heavy-duty double row angular contact thrust ball bearing with two-piece housing washer, 60° contact angle, high axial rigidity, bidirectional axial load capacity, heavy-cutting spindle thrust bearing.

130: Nominal matching shaft diameter 130 mm.

CTN9: Optimized non-metallic cage design adapted to moderate shock and continuous operation.

SP: Precision accuracy class for high-precision spindle rotation.

Load & Speed Data

Basic dynamic load rating Cr：106 kN

Basic static load rating C0r：360 kN

Permissible speed, grease lubrication：3 600 r/min

Permissible speed, oil-air lubrication：4 300 r/min

Material & Additional Properties

Rolling element material: Bearing steel

Indicative carbon footprint：28.1 kg CO₂e

Net weight：7.6 kg

eClass code：23-05-10-02

UNSPSC code：31171531

Suffix Explanation

BTW: Heavy-duty oriented double row angular contact thrust ball bearing with separated two-piece housing washers and 60° large contact angle, capable of heavy bidirectional axial loads. Compared with BTM high-speed series, axial rigidity and load ratings are greatly improved while limiting speed decreases, suitable for medium-speed heavy cutting conditions.

130: Reference shaft journal dimension 130 mm.

CTN9: Improved non-metallic cage balancing low friction and shock resistance.

SP: SP precision grade with superior rotational accuracy for finishing and high-precision positioning spindles.

Important reminder: BTW series thrust ball bearings are mainly designed for bidirectional axial loads and can only withstand minimal radial load. Heavy-duty spindle assemblies must adopt radial bearings (NN series double row cylindrical roller bearings) in combination. No locating shoulder on outer ring; axial restraint relies entirely on bearing housing. Without built-in lubrication channels, continuous on-line re-lubrication during running is impossible, suitable for periodic maintenance lubrication. Open bearing without integral seals; oil seals or labyrinth seals shall be installed on housings to block coolant and dust. No pre-filled grease upon delivery. The 60° large contact angle delivers outstanding axial rigidity and better resistance to axial shock loads than 30° contact angle BTM series.

Alternative variants:

BTW130 CTN9 (Standard precision heavy-duty thrust bearing)

BTW130 CTN9/SP (SP precision grade, first choice for high-precision heavy-cutting spindles)

2 Structure & Operating Characteristics

BTW 130 CTN9/SP is SP precision grade heavy-duty double row angular contact thrust ball bearing with 60° contact angle, two-piece housing washer construction and improved non-metallic cage for bidirectional axial load support. The large 60° contact angle is designed to prioritize axial rigidity and load capacity to resist axial shock from heavy cutting. Compared with 30° contact angle BTM high-speed bearings, limiting speed is reduced, fitting medium-speed high-load cutting applications. CTN9 upgraded non-metallic cage balances low heat generation and moderate shock resistance, delivering stable long-duration load performance.

Core features: 60° contact angle + BTW heavy-duty series design + SP precision grade + CTN9 improved non-metallic cage. Classic spindle matching scheme: NN series double row cylindrical roller bearing for radial support paired with BTW thrust bearing for heavy-duty bidirectional axial positioning, mainstream configuration for vertical heavy-cutting machining centers and large mold milling machines.

Selection guide:

BTW130 CTN9/SP (SP precision grade, heavy mold cutting spindles, priority on axial rigidity & precision)

BTW130 CTN9 (NSTD standard precision, general heavy machinery for cost control)

BTM130 AT series (High-speed type for medium-load high-speed finishing, complementary speed & load characteristics)

3 Core Performance Advantages

1. 60° large contact angle offers excellent axial rigidity, strong resistance to axial deformation and shock loads, perfectly suited for heavy cutting.

2. Exclusive BTW heavy-duty internal rolling geometry achieves high basic dynamic and static load ratings, enabling long-term operation under large bidirectional axial forces.

3. Double row ball with two-piece housing washer structure accepts axial loads in both directions to realize stable bidirectional spindle axial limitation.

4. CTN9 improved non-metallic cage reduces friction loss, balancing temperature control and moderate shock resistance.

5. SP precision grade provides superior rotational accuracy, meeting positioning requirements of high-precision mold processing and precision boring & milling equipment.

6. Standardized two-piece housing washer design ensures good interchangeability with existing spindle components for convenient maintenance replacement on heavy-duty machine tools.

4 Typical Application Fields

4.1 Spindles of vertical heavy-cutting machining centers and large mold milling machines

Combined with NN double row cylindrical roller bearings to carry heavy bidirectional axial shock loads for mold roughing and heavy cutting

4.2 Spindles of CNC boring & milling machines and medium-large gantry boring-milling equipment

Medium-speed high-rigidity precision boring applications

4.3 Heavy-duty turn-mill spindles and vertical lathe spindles

Machining scenarios with large axial cutting force

4.4 Heavy-duty precision indexing heads and large rotary fixtures

5 Assembly Specifications & Usage Guidelines

5.1 Assembly Environment & Operation Standards

Assembly for SP precision bearings is recommended inside clean dust-controlled workshops. Remove contaminants on shaft shoulders, housing bores and spacer mating surfaces. Strictly follow installation orientation of two-piece washers to avoid ball displacement. Direct hammer impact on balls or cage is strictly forbidden. Non-metallic cage has limited toughness; violent force during assembly must be avoided. No outer ring locating shoulder; ensure flat full contact of washer surfaces and achieve axial limitation via bearing housing. Load sharing principle: radial loads shall be transferred to matched cylindrical roller bearings, this bearing only undertakes axial force. Without built-in re-lubrication grooves, continuous running oil supply is unavailable; lubricant replenishment shall be arranged during periodic shutdown maintenance. Equip bearing housings with oil seals or labyrinth seals to prevent dust and coolant from entering raceways. Avoid sustained extreme shock loads to extend cage service life.

5.2 Selection Guidance

Medium-speed heavy-duty spindle matched with NN double row cylindrical roller bearing, heavy bidirectional axial loads, high axial precision and rigidity required → BTW130 CTN9/SP

General heavy machinery for heavy cutting, moderate precision requirement, cost-sensitive → BTW130 CTN9

High-speed finishing with medium axial load, priority on limiting speed and low temperature rise → Select BTM130 series bearings

Important notice: Never use BTW thrust bearing alone to support radial loads; uneven ball loading will trigger premature fatigue spalling. Absence of continuous on-line lubrication structure requires reasonable maintenance intervals for long-term continuously operating heavy-duty machinery.

5.3 Lubrication Maintenance Instruction

No lubricant pre-filled at factory. Both grease lubrication and oil-air lubrication are applicable; oil-air lubrication helps control temperature rise under continuous heavy load. Without annular lubrication passages, non-stop on-line oil replenishment cannot be realized; lubricant filling must be completed during scheduled machine shutdown. Continuously monitor spindle temperature rise, axial vibration and machining dimensional stability. Moderate temperature rise during heavy cutting is normal; inspect lubrication system and cage operating condition immediately when excessive overheating occurs.

5.4 Environmental Application Notes

Open construction without built-in seals; reliable sealing devices must be mounted on bearing housings. Balls and raceways are sensitive to erosion from dust and coolant. Contaminant intrusion easily causes raceway scratches and pitting, leading to rapid accuracy loss. Avoid prolonged continuous high-temperature operation to prevent aging and deformation of non-metallic cage.

6 Fault Identification

Common failure modes: Workpiece dimensional drift during heavy cutting, increased spindle vibration at medium speed, abnormal temperature rise during operation, periodic abnormal noise. Primary causes: Extra radial load leading to one-sided biased loading; insufficient lubrication causing dry friction; uneven stress caused by tilted installation of two-piece washers; seal failure allowing foreign particles into raceways; cage damage induced by sustained strong axial shock loads; cage aging from long-term overheating. Shut down equipment immediately once accuracy degradation, abnormal noise or overheating appears. Bearings with permanent damage on cage, raceways or balls must be replaced as a whole.