HK202918-RS / HK202918 / HK20x29x18 Motorcycle Clutch Bearing / Needle Roller Bearing With Seal , 20*29*18mm

1.Product Overview

HK202918, HK202918-RS and HK20x29x18 are identical metric single-row through open drawn cup needle roller bearings without inner ring, unified core dimension Fw=20mm matching shaft diameter, outer diameter D=29mm, overall width C=18mm. HK202918 and HK20x29x18 are two different industry marking formats for the same open-type bearing; HK202918-RS is the single-side rubber sealed variant of this size.
HK series adopts integrated one-piece stamped thin steel outer cup, directly pressed into housing interference hole for installation, no extra snap rings or positioning sleeves required to simplify assembly work.

• HK202918 / HK20x29x18: Basic open both ends type without rubber seal, excellent heat dissipation, suitable for clean, dry indoor production environments;
• HK202918-RS: Single-lip NBR contact rubber seal installed on one end, blocks fine dust, cutting fluid and light moisture for lightly polluted workshop working conditions.
  Stamped steel cage evenly separates dense needle rollers to realize ultra-high radial bearing capacity under ultra-narrow radial cross-section. Matching installation shaft surface must be quenched to HRC60–64 and mirror superfinished to act as inner raceway. This series only bears pure radial load, widely used for medium-sized gearboxes, agricultural machinery, textile looms, automation rotary sliding parts, hydraulic pump auxiliary shafts and general industrial transmission assemblies with limited radial installation spaceAlibaba.co....

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2.Technical Specifications

Unified Base Standard Parameters

Fw (Needle assembly inner diameter): 20 mm
Outer Diameter D: 29 mm
Overall Width C: 18 mm
Structure: Single row through open drawn cup needle bearing, no inner ring, stamped carbon steel roller retainer
Material: Drawn cup & needle rollers GCr15 high-carbon chrome bearing steel
Standard Radial Clearance: CN normal clearance
Reference grease limiting rotation speed: 13200 r/min
Oil lubrication limiting rotation speed: 16900 r/min
Required matching shaft hardness: HRC60–64 mirror superfinishing
Minimum chamfer r: 0.6 mm

HK202918 / HK20x29x18

Sealing: Both ends fully open, no rubber dust seal
Dynamic Load Cr: 8700 N
Static Load Cor: 9980 N
Fatigue Load Limit Pu: 1640 N
Net Weight: 0.026 kg

HK202918-RS

Sealing: Single side RS NBR contact rubber dust-proof seal
Dynamic Load Cr: 8350 N
Static Load Cor: 9540 N
Fatigue Load Limit Pu: 1580 N
Net Weight: 0.027 kg
Complete dimensional drawings and full technical load data of three models are available upon customer request.

3.Key Advantages

1. Integral thin steel drawn cup press-fit installation design, directly pressed into housing interference hole without additional axial fixing parts, cut component quantity and assembly labor cost
2. Ultra-thin radial cross-section greatly reduces equipment radial occupied space, perfectly meets medium compact transmission structural design demands
3. Two structural options (open / single RS sealed) cover mainstream working conditions: clean dry indoor and slightly dusty humid production workshops; HK202918 and HK20x29x18 share identical open structure with different marking standards
4. Dense needle roller uniform layout brings outstanding radial rigidity and medium heavy load capacity, stable continuous medium-speed operation under frequent start-stop alternating impact loads
5. Lightweight stamped steel cage ensures uniform roller guidance, low friction loss and efficient heat dissipation for long-cycle non-stop equipment operation
6. Customizable options include double-sided 2RS composite rubber seals, C3 enlarged radial clearance, stainless steel anti-rust drawn cup, OEM laser marking and high-temperature wear-resistant grease filling
   Effectively simplify housing machining processes and extend service life of medium-sized gearbox and agricultural machinery shaft transmission assembliesszsdwgz.en...

4.Applications

This HK202918 / HK202918-RS / HK20x29x18 multi-spec open drawn cup needle roller bearing set is widely matched for the following medium light & medium industrial equipment:
Medium reduction gearboxes, agricultural harvesting machinery and grain conveyor rotary shaft supporting assemblies
Textile weaving looms, printing equipment tension roller transmission units
Automation equipment cam rotary parts and linear sliding support components
Light hydraulic oil pump, small hydraulic valve core lightweight rotary sliding assemblies
Packaging machinery, construction light transport equipment rotary supporting spare parts
Aftermarket replacement spare parts for 20mm inner diameter open drawn cup needle roller bearing equipment
Ideal dual-structure high radial load bearing solution for narrow radial space medium industrial transmission equipmentMade-in-Ch...

5.Why Choose GQZ Bearing

• 25 years of professional HK series open drawn cup needle roller bearing manufacturing experience
• Three models fully dimensionally interchangeable with international standard HK202918 series bearings, consistent dimensional tolerance and load performance indicators
• Complete OEM & ODM customized service supporting double-sided sealing, stainless steel shell and special clearance customization
• Full-process strict inspection: raw material hardness testing, drawn cup deep drawing forming precision, sealing tightness and dynamic load fatigue cycle testing before delivery
• Professional needle bearing engineering team provides housing interference tolerance and matching shaft hardness installation guidance within 24 hours
• Stable large-scale mass production assembly lines with preferential bulk wholesale price for long-term agricultural and general machinery equipment manufacturers
• We focus on stable press-fit performance, reliable dust resistance and long-term win-win cooperation with global industrial buyers

6.Quality Control

• Raw material chemical composition and surface hardness inspection of GCr15 chrome bearing steel
• Precision deep drawing, trimming and forming processing for integral open outer drawn cup
• Constant temperature quenching & tempering heat treatment process to stabilize internal metal stress and enhance surface wear resistance
• Comprehensive performance testing: radial clearance uniformity, needle roller arrangement consistency, dynamic/static load capacity and RS seal dust-proof durability
• Uniform needle roller assembly inspection and separate dimensional & appearance re-inspection for each model before anti-rust packaging and shipment
• Every batch of bearings passes full sampling reciprocating cycle durability test to guarantee stable heavy radial load continuous operation

7.Get a Quote Now

If you need high-quality HK202918 / HK20x29x18 open type and HK202918-RS single sealed drawn cup needle roller bearings for medium gearbox and agricultural machinery equipment, send your inquiry to us directly.
You will receive full professional supporting services after submitting inquiry:
Fast official factory quotation reply within 24 hours
One-on-one housing interference tolerance & matching shaft hardness parameter matching guidance by professional bearing engineers
Customized bearing solution suggestions including double 2RS sealed variants and stainless steel anti-rust drawn cup options
Competitive direct factory bulk wholesale price for mixed three-model combined bulk orders
Send your required purchase quantity of each model and equipment working environment to obtain detailed formal quotation

8.FAQ

Q1: What is the difference between HK202918 and HK20x29x18?
A1: The two are marking differences of the same open drawn cup needle bearing, dimensions, load parameters and installation performance are completely consistent, fully interchangeable.
Q2: What is the function of HK202918-RS single RS seal?
A2: Single-side NBR rubber seal isolates workshop dust, fiber debris and light splash cutting fluid, suitable for slightly polluted production environments to reduce refueling maintenance frequency.
Q3: Can HK series bearings operate without hardened ground shaft?
A3: Not recommended. The matching shaft contact surface must reach HRC60–64 quenching hardness with mirror superfinishing to serve as inner raceway and avoid rapid bearing abrasion failure.