One-Way Clutch Bearings (CSK)

CSK series one-way bearings are sprag-type overrunning clutches integrated with 62-series deep groove ball bearings (except CSK8 & CSK40), combining radial load support and unidirectional torque transmission. They lock to drive in one direction and freewheel in the opposite, ideal for backstopping, indexing, and overrunning applications. Pre-greased and sealed against dust >0.3mm, with options: CSK (basic), CSK-P (inner keyway), CSK-PP (inner+outer keyways), CSK-2RS (double lip seals).

Classification :

One‑Way Bearings

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Category Overview

One-Way Clutch Bearings (CSK Series), also called overrunning clutches, freewheel clutches, single direction lock bearings and unidirectional clutch bearings, are precision integrated transmission components. They transmit torque firmly in one rotational direction and freely freewheel in the reverse direction without resistance.

Each CSK one-way clutch comes with pre-installed ball bearing raceways, removing the need for extra radial support bearings and simplifying machine transmission structures. We are a bearing manufacturer with over 10 years of production experience, manufacturing the full CSK series to international ISO dimensional standards. Our overrunning clutches deliver high torque capacity, compact overall size, stable rotation and long service life, serving global machinery distributors, automation equipment factories and industrial transmission brands.
Spanish search keyword: rodamiento embrague unidireccional serie CSK, embrague rueda libre para maquinaria industrial.

Our Series Breakdown

We supply four mainstream CSK one-way clutch variants for diverse working environments: standard open type, double rubber sealed dustproof type, keyway sealed type and tapered bore self-locking type.

Series Model	Core Product Features	Typical Application Scenarios
CSK Series (Standard Open Type)	Open internal structure, standard straight inner bore, high torque output, compact size, simple press-fit installation, cost-effective for clean indoor workshop environments	Conveyor belts, packaging machinery, printing equipment, textile looms, light-duty industrial gearboxes
CSK..PP Series (Double Sealed Type)	Dual rubber contact sealing design, full dust-proof and splash-proof performance, maintenance-free internal lubrication, anti-rust heat treatment, ideal for dusty and humid working conditions	Food processing machinery, outdoor agricultural equipment, automotive auxiliary transmission systems, light construction machinery
CSK..2RS Series (Sealed With Inner Keyway)	Sealed housing with built-in shaft keyway, anti-slip shaft locking structure, extreme impact and torque resistance, avoids shaft slipping under heavy load operation	Heavy-duty speed reducers, mining conveying machinery, large industrial gearboxes, high-load automation equipment
CSK..K Series (Tapered Inner Bore)	Self-locking tapered inner bore, no extra locking nut required, fast mounting and disassembly, high rotational precision, minimal internal operating clearance	CNC machine tools, precision testing instruments, high-speed automation production lines, medical transmission devices

1. Full Dimension Chart - CSK Standard Open One-Way Clutch (Complete Specs)

Bearing Number	Inner d (mm)	Outer D (mm)	Width B (mm)
CSK10	10	30	9
CSK12	12	32	10
CSK15	15	35	11
CSK17	17	40	12
CSK20	20	47	14
CSK25	25	52	15
CSK30	30	62	16
CSK35	35	72	17
CSK40	40	80	22
CSK45	45	85	23
CSK50	50	90	24
CSK60	60	110	25

2. Full Dimension Chart - CSK PP Double Sealed Dustproof Type

Bearing Number	Inner d (mm)	Outer D (mm)	Width B (mm)
CSK15PP	15	35	11
CSK17PP	17	40	12
CSK20PP	20	47	14
CSK25PP	25	52	15
CSK30PP	30	62	16
CSK35PP	35	72	17
CSK40PP	40	80	22
CSK45PP	45	85	23
CSK50PP	50	90	24

3. Full Dimension Chart - CSK 2RS Keyway Sealed Heavy Load Type

Bearing Number	Inner d (mm)	Outer D (mm)	Width B (mm)
CSK152RS	15	35	11
CSK202RS	20	47	14
CSK252RS	25	52	15
CSK302RS	30	62	16
CSK352RS	35	72	17
CSK402RS	40	80	22

4. Full Dimension Chart - CSK K Tapered Bore Self-Locking Precision Type

Bearing Number	Inner d (mm)	Outer D (mm)	Width B (mm)
CSK20K	20	47	14
CSK25K	25	52	15
CSK30K	30	62	16
CSK35K	35	72	17
CSK40K	40	80	22

Core Product Advantages

Stable unidirectional torque transmission, precise overrunning freewheel function without reverse rotation slippage
Integrated built-in ball bearing raceway structure, removes requirement for extra radial support bearings to cut assembly costs
Compact external outline design, saves internal installation space and simplifies overall machine transmission layout
High-carbon steel raw material with full heat treatment, hardened raceway for high torque load capacity and strong impact resistance
Multiple structural options including open / PP sealed / 2RS keyway / K tapered bore to match dusty, humid, splash harsh production environment
Strictly produced to ISO international dimensional tolerance, 100% interchangeable with mainstream brand overrunning clutch bearings
Smooth low-noise rotation, stable long-term continuous operation, extended whole machine service life
Over 10 years factory direct supply, large finished goods stock, support mixed batch wholesale & OEM custom packaging

Global Industrial Application Range

CSK series freewheel one-way clutch bearing is widely applied in automation conveying equipment, food packaging machinery, offset printing machines, textile looms, speed reducers, agricultural harvester machinery, automotive auxiliary transmission, mining small conveyors, CNC machine tools, precision testing instruments and all transmission devices that require single direction motion control & anti-reverse protection.

Spanish market application keyword: embragues unidireccionales para transportadoras, maquinaria de empaque, impresoras y maquinaria agrícola.

Frequently Asked Questions (Global Distributors & Machinery Manufacturers)

Q1: Are you a real factory or trading company? How many years produce one way clutch bearings?

A: We are a professional bearing manufacturer with over 10 years production experience, independent production workshop, full CNC grinding and assembly lines, mass stock of full range CSK series overrunning clutches. All goods direct factory supply without middle agent, more competitive wholesale price for global importers and equipment brands.

Q2: What is your MOQ for CSK one way clutch bearing wholesale? Can I mix different models in one order?

A: Our standard MOQ for in-stock freewheel clutches is 100pcs per model, small trial sample orders are acceptable for new cooperation distributors. We fully support mixed batch ordering, you can combine CSK open, PP sealed, 2RS keyway, K tapered bore types together in one shipment to lower your inventory pressure and procurement cost.

Q3: Can your CSK overrunning clutch bearings interchange SKF / NTN standard one-way lock bearings?

A: Yes, all our CSK series one-way clutch strictly follow ISO & international standard dimension drawing, inner hole, outer diameter, width, tolerance and inner clearance fully consistent with mainstream famous brand freewheel clutches, can directly replace without any equipment modification for after-sales maintenance projects.

Q4: Can I get free test samples of CSK freewheel clutches? How long for sample and mass order lead time?

A: We offer free bearing samples for qualified bulk wholesale buyers, clients only need to undertake international express freight. Sample production lead time: 3-5 working days. Large mass bulk order lead time: 7-15 working days, full stock CSK models can arrange shipment within 48 hours after deposit confirmation.

Q5: Do you accept OEM custom service for one-way clutch bearings?

A: We provide full set OEM customized solutions: laser engrave your private brand logo on bearing inner & outer ring, custom neutral color export carton packaging, special C2/C3 clearance adjustment, stainless steel anti-corrosion material customization, custom keyway / special tapered bore size for unique automation equipment.

Need Bulk Quotation Or Custom CSK Clutch Bearings?

Send your required model list, quantity and special technical requirements to our sales team, we will offer competitive factory wholesale price, detailed dimension drawing and free technical selection support within 24 hours!

Support mixed batch, fast global delivery, complete customs clearance documents for Europe, Latin America, Southeast Asia & Middle East markets.

Related Bearing Series You May Purchase Together (Full Factory Catalog): Miniature Deep Groove Ball Bearings | Other One-Way Lock Clutch Bearings | LF FR Flanged Micro Bearings | Full Bearing Product Catalog

One‑Way Bearings

One‑way bearings are also known as overrunning clutch bearings. They realize free rotation in one direction and torque locking in the opposite direction, widely used to prevent reverse rotation and complete overrunning transmission for various mechanical equipment.

There are multiple product series for one‑way bearings on the market, including CSK series, CK‑A series, CK‑B series, ASNU series and other structural types. Different series differ in internal structure, bearing capacity and installation requirements. Our factory mainly supplies CSK series one‑way clutch bearings for bulk wholesale, other one‑way bearing models can be provided upon inquiry.

CSK Series One‑Way Clutch Bearing Main Features

Roller‑type clutch internal structure, stable locking performance
Two common versions: standard type without keyway, CSK‑P type with inner ring keyway
Compact structure, easy installation for limited mounting space
Adopt chrome steel material, suitable for long‑time industrial continuous operation

Typical Application Scenarios

Conveyor equipment, packaging machinery
Textile machinery, small‑size reducers
Printing machines, light‑duty transmission devices

Hot‑selling CSK Series Models

CSK8, CSK12, CSK15, CSK17, CSK20, CSK25, CSK30, CSK35, CSK40

To learn more about working principle, structural differences and selection tips, please go to CSK series technical introduction page.

View complete dimension parameters for each specification on CSK full model list page.

We are a professional Chinese bearing factory. We support bulk order wholesale for one‑way bearings. Please send your required model and quantity to get competitive factory price.

PRODUCT TESTING

Bearing Forging

Bearing Annealing

Turning Process

Quenching

Bearing Assembly

Bearing Clearance Testing

Grease injection

Bearing Marking

One‑Way Bearings