BK0306-TV BK 0306-TN Needle Roller Bearing 3x6.5x6mm P5 P4 P6

1.Product Overview

BK0306-TV and BK0306-TN are ultra-miniature metric single-row closed-end drawn cup needle roller bearings without inner ring, unified boundary dimension Fw=3mm roller assembly inner diameter, outer diameter D=6.5mm, total width C=6mm. BK series adopts integrated one-piece stamped steel outer cup with solid closed bottom cap, which realizes automatic axial limiting inside blind hole housings, eliminating extra snap rings, shaft shoulders and end caps to simplify micro equipment assembly.

• BK0306-TV: Standard glass fiber reinforced PA66 plastic cage, stable high-speed performance, good heat resistance for continuous quiet miniature transmission;
• BK0306-TN: Optimized PA66 nylon cage with improved roller positioning, ultra-low friction, lower running noise, ideal for precision micro drive devices with strict noise requirements.

Dense needle roller layout delivers reliable radial load capacity under ultra-slim radial cross-section. The matching shaft surface must be quenched to HRC60–64 and mirror superfinished to serve as inner raceway. This series only bears pure radial load, widely used for micro reduction gearboxes, tiny handheld power tools, miniature office equipment, textile micro tension rollers, automation micro sliding components and lightweight model transmission assemblies with extreme radial space limitations.

Get a quote within 24 hours for your project

2.Technical Specifications

Unified Base Standard Parameters

Fw (Needle assembly inner diameter): 3 mm
Outer Diameter D: 6.5 mm
Overall Width C: 6 mm
Structure: Single row closed end drawn cup needle bearing, no inner ring
Outer Cup Material: GCr15 high-carbon chrome bearing steel
Standard Radial Clearance: CN normal clearance
Minimum chamfer r: 0.3 mm
Required matching shaft hardness: HRC60–64 mirror superfinishing

BK0306-TV

Cage Type: Standard glass fiber reinforced PA66 TV plastic cage
Dynamic Load Cr: 1230 N
Static Load Cor: 840 N
Fatigue Load Limit Pu: 85 N
Reference grease limiting speed: 33000 r/min
Oil lubrication limiting speed: 50000 r/min
Net Weight: 0.0009 kg

BK0306-TN

Cage Type: Optimized glass fiber reinforced PA66 TN plastic cage
Dynamic Load Cr: 1230 N
Static Load Cor: 880 N
Fatigue Load Limit Pu: 88 N
Reference grease limiting speed: 24000 r/min
Oil lubrication limiting speed: 26000 r/min
Net Weight: 0.0010 kg
Complete dimensional drawings and full technical load data of two models are available upon customer request.

3.Key Advantages

1. Integrated closed bottom cap self-locating design, directly pressed into blind hole housing without additional axial fixing parts, cut micro equipment part count and assembly labor cost
2. Ultra-miniature slim radial cross-section greatly reduces equipment radial occupied space, perfectly matches micro compact transmission structural design demands
3. Two PA66 plastic cage options (TV / TN) meet different working demands: TV for ultra-high speed operation; TN for ultra-quiet low-friction precision transmission
4. Compact dense needle layout provides stable radial rigidity and load capacity, reliable continuous low & medium speed reciprocating operation
5. Fiberglass reinforced nylon cage effectively reduces rolling friction, suppresses abnormal noise and avoids cage deformation under long-cycle operation
6. Customizable options include single RS rubber dust seal, C3 enlarged radial clearance, stainless steel anti-rust drawn cup, OEM laser marking and low-temperature special lubricant filling

Effectively simplify micro blind hole housing machining processes and extend service life of miniature shaft-end transmission assemblies

4.Applications

This BK0306-TV / BK0306-TN ultra-miniature closed end needle roller bearing set is widely matched for the following micro light-duty industrial and civilian equipment:

• Micro miniature reduction gearboxes, tiny transmission box blind hole shaft end supporting assemblies
• Mini handheld electric power tools, small garden micro electric machinery rotary moving parts
• Office precision tiny equipment, textile micro loom tension sliding roller units
• Automation miniature linear sliding mechanisms and micro cam shaft positioning components
• Light model toys, small household electrical lightweight rotary sliding assemblies
• Aftermarket replacement spare parts for 3mm inner diameter micro closed end drawn cup needle roller bearing equipment

Ideal dual-option compact high-speed micro bearing solution for blind hole shaft-end miniature transmission equipment

5.Why Choose GQZ Bearing

• 25 years of professional micro BK series closed end drawn cup needle roller bearing manufacturing experience
• Two models fully dimensionally interchangeable with international standard BK0306 series bearings, consistent outer cup dimensional tolerance
• Complete OEM & ODM customized service supporting RS sealing, stainless steel shell and special clearance customization
• Full-process strict inspection: raw material hardness testing, deep drawing forming precision, plastic cage assembly tightness and high-speed cycle durability testing before delivery
• Professional bearing engineering team provides micro blind hole housing tolerance and matching shaft hardness installation guidance within 24 hours
• Stable mass production assembly lines with preferential bulk wholesale price for long-term miniature equipment manufacturers

We focus on stable axial positioning performance, low noise and long service life, building 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 integrated closed end outer drawn cup
• Constant temperature heat treatment process to stabilize outer cup internal stress and enhance surface wear resistance
• Separate targeted performance testing for two versions: TV cage high-speed temperature resistance, TN cage low-noise friction performance, radial clearance uniformity
• 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 radial load operation in micro blind hole housings

7.Get a Quote Now

If you need high-quality BK0306-TV standard PA66 cage and BK0306-TN low-noise optimized nylon cage micro closed end drawn cup needle roller bearings for micro gearbox and mini 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 micro blind hole housing tolerance & matching shaft hardness parameter matching guidance by professional bearing engineers
• Customized bearing solution suggestions including RS sealed variants and stainless steel anti-rust drawn cup options
• Competitive direct factory bulk wholesale price for mixed two-model combined bulk orders

Send your required purchase quantity of each model and equipment operating environment to obtain detailed formal quotation

8.FAQ

Q1: What do suffix TV and TN stand for?
A1: TV = standard glass fiber reinforced PA66 plastic cage for ultra-high speed operation; TN = optimized PA66 nylon cage with lower friction and quieter running performance.
Q2: What’s the core difference between BK0306-TV and BK0306-TN?
A2: Overall dimensions are fully consistent; TV version supports higher limiting rotation speed; TN version features optimized roller guidance for lower noise and slightly improved static load rating.
Q3: Can BK series bearings work without hardened ground shaft?
A3: Not recommended. Matching shaft contact surface must reach HRC60–64 quenching hardness with mirror superfinishing to act as inner raceway and prevent rapid bearing abrasion failure.