R188-2Z 6.35x12.7x4.762mm Double Metal Shield Miniature Deep Groove Ball Bearing

1. Product Overview

R188-2Z is standard inch single row miniature deep groove ball bearing, dimension 6.35×12.7×4.762mm (1/4"×1/2"×3/16"). 2Z stands for double-sided stamped metal dust shields, blocking fine dust and dry debris while keeping internal lubricant sealed inside. Smooth deep raceway bears radial load and slight bidirectional axial load, features ultra-low friction, quiet operation and ultra-high limiting speed. Pre-filled long-life low-viscosity grease for maintenance-free running. Widely applied to yo-yos, fidget spinners, RC model cars, miniature DC motors, small cooling fans, handheld power tools and precision hobby equipment.

2. Technical Specifications

Model: R188-2Z
d:6.35mm (1/4"), D:12.7mm (1/2"), B:4.762mm (3/16")
Min fillet r:0.15mm
Dynamic load Cr:0.618kN, Static load C0r:0.44kN
Grease limiting speed:53000r/min
Net weight:0.002kg
Structure: Single row deep groove, double-sided 2Z metal dust shield
Cage: Thin stamped steel cage
Material: GCr15 vacuum smelting bearing steel, hardness HRC60-65
Clearance: Standard CN, C3 customizable
Precision: P0 standard, P6/P5 optional
Operating temperature: -30℃ ~ 110℃
Dimension drawings and durability test reports available on request.

3. Core Advantages

• Double thin metal 2Z dust shield, good dry dust isolation, low rotational resistance for ultra-high speed
• Standard inch size, universal matching for toy, hobby and miniature industrial equipment shafts
• Ultra-light compact micro structure, saves space for small precision assembly layout
• Polished deep raceway + high-grade steel balls, ultra-smooth rotation, low noise and long spin time
• Pre-filled low drag high-speed grease, long service life without frequent re-lubrication
• Multiple versions available: open R188, stainless steel anti-rust model, 2RS rubber sealed type
• Custom high-precision grade, special low-friction grease and batch laser marking services available

4. Application Scenarios

• Hobby & toy: Yo-yos, fidget spinners, remote control car wheel axles, model aircraft micro shafts
• Micro power equipment: Tiny cooling fans, miniature DC vibration motors, handheld mini power tools
• Precision automation: Small testing instrument rotary parts, miniature linear sliding auxiliary bearings
• Light industrial equipment: Small textile loom spindles, mini printer transmission rollers

Fit OEM assembly and aftermarket replacement of high-speed light-load miniature rotating equipment.

5. Why Choose GQZ Bearing

25 years professional production of inch-size miniature deep groove ball bearings. Vacuum smelting high-purity GCr15 steel with stable quenching and tempering heat treatment for consistent smooth rotation performance. Full OEM & ODM customization for seal type, precision grade, clearance and special low-friction lubricant. Strict full-process inspection includes raw material hardness test, ultra-precision raceway mirror grinding, high-grade steel ball sorting and high-speed spin aging test. 24-hour professional technical support for miniature shaft tolerance matching and grease selection guidance. Factory direct bulk price, abundant micro bearing spot stock for global toy, hobby and micro motor manufacturers.

6. Quality Control

1. Raw material chemical composition and hardness inspection
2. Integral quenching and stress relief tempering to eliminate internal residual stress
3. CNC ultra-precision inner and outer ring raceway mirror superfinishing
4. High-precision steel ball screening and thin steel cage stamping forming
5. Dust-free assembly with low-viscosity high-speed mechanical grease pre-filling
6. Continuous ultra-high-speed rotation aging and wear resistance cycle testing
7. Full dimension inspection, anti-rust oil coating, neutral small carton export packaging

Each batch completes rotation smoothness and noise test to guarantee stable long-time high-speed operation for hobby and micro machinery.

7. Get A Quote

Send inquiries for R188-2Z inch miniature bearings used on yo-yos, RC models and micro cooling fans.
Services after inquiry:

1. Standard quotation delivered within 24 working hours
2. Technical guidance for miniature shaft fit tolerance and high-speed lubrication selection
3. Upgrade options: P5 high precision grade, stainless steel corrosion resistant version, low-drag synthetic grease
4. Competitive factory bulk unit price for large quantity orders

Please state order quantity, rotating speed and working environment for complete quotation documents.