HK1518 / HK1518-RS Needle Roller Bearing / HK1518RS Drawn Cup Roller Bearing with Open End 15x21x18mm

1. Product Overview

HK1518, HK1518-RS and HK1518RS are metric single row open drawn cup needle roller bearings without inner ring, unified core dimension Fw=15mm roller inner diameter, outer diameter D=21mm, overall width C=18mm. HK series adopts integrated one-piece stamped thin steel outer cup with through open structure, directly pressed into housing interference hole for installation, no extra fixing accessories required.

• HK1518: Basic open type without rubber seal, excellent heat dissipation, suitable for clean, dry indoor working environments;
• HK1518-RS / HK1518RS: Two different marking codes for identical single-lip NBR contact rubber sealed version, RS seal installed on one side to block fine dust, cutting fluid and light moisture for slightly polluted production workshops.

Stamped steel cage evenly separates dense needle rollers to achieve ultra-high radial load capacity under ultra-narrow radial cross-section. Matching installation shaft surface must be quenched to HRC60–64 with mirror superfinishing to serve as inner raceway. This series only bears pure radial load, widely used for miniature gearboxes, handheld power tools, textile tension rollers, automation rotary sliding parts, micro hydraulic valves and light agricultural machinery transmission assemblies with limited radial installation space.

Get a quote within 24 hours for your project

2. Technical Specifications

Unified Base Standard Parameters

Fw (Needle assembly inner diameter): 15 mm
Outer Diameter D: 21 mm
Overall Width C: 18 mm
Structure: Single row through open drawn cup needle bearing, no inner ring, stamped 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: 15000 r/min
Oil lubrication limiting rotation speed: 18800 r/min
Required matching shaft hardness: HRC60–64 mirror superfinishing
Minimum chamfer r: 0.6 mm

HK1518

Sealing: Both ends open, no rubber seal
Dynamic Load Cr: 11300 N
Static Load Cor: 14700 N
Fatigue Load Limit Pu: 2010 N
Net Weight: 0.0145 kg

HK1518-RS / HK1518RS

Sealing: Single side RS NBR contact rubber dust seal, two part numbers for same sealed structure
Dynamic Load Cr: 10950 N
Static Load Cor: 14250 N
Fatigue Load Limit Pu: 1950 N
Net Weight: 0.0149 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 design, directly pressed into housing interference hole without snap rings or positioning sleeves, reduce assembly parts and labor cost
2. Ultra-thin radial cross-section minimizes equipment radial occupied space, perfectly matches miniaturized compact transmission structural design requirements
3. Two structural options (open / single RS sealed) cover mainstream working conditions: clean dry and damp dusty production environments; HK1518-RS and HK1518RS are identical sealed product with different marking standards
4. Dense needle roller arrangement provides outstanding radial rigidity and heavy load capacity, stable continuous medium-speed operation under frequent start-stop light 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 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 compact shaft-end transmission assemblies

4. Applications

This HK1518 / HK1518-RS / HK1518RS multi-spec open drawn cup needle roller bearing set is widely matched for the following compact light & medium industrial equipment:

• Miniature reduction gearboxes, small transmission box rotary shaft supporting assemblies
• Handheld electric power tools, garden mini machinery and light agricultural rotary moving parts
• Textile weaving looms, small printing equipment tension sliding roller units
• Automation miniature linear sliding mechanisms and cam shaft positioning components
• Small hydraulic control valves, micro water pump lightweight rotary sliding assemblies
• Aftermarket replacement spare parts for 15mm inner diameter open drawn cup needle roller bearing equipment

Ideal multi-option high radial load bearing solution for narrow radial space industrial transmission equipment

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 HK15 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 precision, sealing tightness and dynamic load fatigue cycle testing before delivery
• Professional 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 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 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 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 HK1518 open type, HK1518-RS & HK1518RS single sealed drawn cup needle roller bearings for miniature gearbox and power tool 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 RS 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’s the difference between HK1518-RS and HK1518RS?
A1: The two part numbers correspond to the same single-lip RS sealed needle bearing, only different industry marking writing formats, dimensions and performance are completely consistent.
Q2: What is the core feature of HK series drawn cup needle bearings?
A2: Through open thin steel outer cup, press-fit installation without additional fixing rings, ultra compact radial size for mini transmission structures.
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.