TAOMSUN Precision Ruby & Sapphire Bearings – Three Series: Through-Hole, End-Face and Groove Types for Low-Friction, High-Speed Applications

TAOMSUN precision ruby & sapphire bearings are high-performance support components designed for low-friction, high-speed operation. Made of synthetic corundum (ruby/sapphire), Mohs hardness 9, surface roughness ≤ 0.01 μm, friction coefficient ≈ 0.14 against metal. Three series – through-hole (straight/arc hole, single/double oil groove), end-face (flat/ball/tapered) and groove (double-ball) – cover 12 standard configurations, with outer diameters customizable from Φ0.8 to 6.0 mm. ISO 9001 certified. Overseas sales and technical support provided by METICULAB (Korea).

Name: TAOMSUN Precision Ruby & Sapphire Bearings – Three Series: Through-Hole, End-Face and Groove Types for Low-Friction, High-Speed Applications
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TAOMSUNPrecision Bearing Components

🌏 Made in China · Korea Sales / Technical Support · OEM / ODM Available

TAOMSUN Single Oil Groove Arc Hole Ruby Bearing – Low-Friction, High-Speed Precision Support

Brand: TAOMSUN ｜ Material: Synthetic Ruby (Corundum / Al₂O₃) ｜ Origin: China ｜ Korea Sales / Technical Support: METICULAB (Korea) ｜ ISO 9001 · Precision Manufacturing

TAOMSUN single oil groove arc hole ruby bearing

1. Product Overview

The TAOMSUN single oil groove arc hole ruby bearing is a high-precision support component designed for low-friction, high-speed operation in instruments and precision equipment. It is made of synthetic ruby (corundum) with a Mohs hardness of 9 — second only to diamond — offering excellent wear resistance, high-temperature stability and mechanical strength. The single oil groove design effectively reduces friction and extends lubrication intervals, while the arc hole structure significantly reduces stress concentration, improving rotational stability and positioning accuracy. Custom sizes available on request; complete inspection reports are provided with every delivery.

🔍 Key Feature: The arc hole design effectively reduces stress concentration at the hole edge, minimizing crack risk and providing smoother contact with mating components — especially suited to high-precision applications with frequent micro-rotation.

2. Product Gallery

Bearing overview

Arc hole structure

Oil groove design

Dimension drawing

3. Technical Specifications

Technical specification chart

Product Name	Single Oil Groove Arc Hole Ruby Bearing
Brand / OEM	TAOMSUN (Overseas partner: METICULAB)
Origin	China
Korea Sales / Technical Support	METICULAB (Korea)
Material	Synthetic ruby (corundum / Al₂O₃) – single crystal
Mohs Hardness	9 (second only to diamond)
Surface Roughness (Ra)	≤ 0.01 μm (ultra-fine finish)
Friction Coefficient (vs. steel)	≈ 0.14 (low-friction operation)
Outer Diameter Range	Φ0.8 – 6.0 mm (customizable)
Thickness Range	0.3 – 2.0 mm
Hole Diameter Range	Φ0.15 – 3.0 mm
Oil Groove Depth	0.07 – 0.25 mm
Hole Shape	Arc hole – stress-reducing design
Oil Groove Design	Single groove – reduces friction, extends lubrication interval
Temperature Resistance	Excellent high-temperature stability (for complex thermal environments)
Mechanical Strength	High elastic modulus · excellent impact resistance
Quality System	ISO 9001 · Precision Manufacturing
Custom Service	Dimensions, tolerances, hole diameter and oil groove geometry customizable

4. Key Advantages

Key advantages chart

✅ Ultra-high hardness – Mohs 9, excellent wear resistance and impact resistance

✅ Ultra-smooth surface – Ra ≤ 0.01 μm, minimizing friction loss

✅ Low friction coefficient – ≈ 0.14 vs. steel, smooth high-speed operation

✅ Single oil groove design – reduces friction, extends maintenance interval

✅ Arc hole stress relief – reduces stress concentration, extends service life

✅ High-temperature performance – stable and reliable in complex thermal environments

✅ High mechanical strength – high elastic modulus, strong load capacity

✅ Precision support – maintains high positioning accuracy under frequent micro-rotation

5. Main Application Fields

Precision instruments & metersAnalytical balances & spectrometersIndustrial automation equipmentServo motors & CNC spindlesMedical diagnostic instrumentsAerospace instrumentationWatch movements & timepiecesPrecision measuring equipmentHigh-speed rotating machinery

6. FAQ

Q: What are the advantages of the arc hole design over a straight hole?
A: The arc hole design effectively reduces stress concentration at the hole edge, minimizes crack risk and provides smoother contact with mating components. It is especially suited to high-precision applications with frequent micro-rotation, significantly extending bearing service life.

Q: What is the function of the single oil groove?
A: The single oil groove stores lubricant and provides continuous lubrication during rotation, effectively reducing friction loss, extending lubrication maintenance intervals and improving equipment operating efficiency.

Q: What is the friction coefficient of this bearing?
A: When paired with steel, the friction coefficient is approximately 0.14, ensuring smooth low-friction, high-speed operation.

Q: What is the standard size range?
A: Outer diameter Φ0.8–6.0 mm, thickness 0.3–2.0 mm, hole diameter Φ0.15–3.0 mm, oil groove depth 0.07–0.25 mm. Non-standard sizes can be customized.

Q: Can non-standard sizes or special oil groove designs be customized?
A: Yes. TAOMSUN supports customization of non-standard dimensions, hole diameters and oil groove geometry. Please provide CAD drawings or specification requirements for a targeted quotation.

Q: What is the lead time for custom orders?
A: Standard stock items ship within 3–5 working days. Custom specifications typically take 2–4 weeks depending on complexity and quantity.

7. About TAOMSUN

TAOMSUN is a precision component manufacturer specializing in hard-material processing and bearing technology. Certified under the ISO 9001 quality management system, the company focuses on synthetic ruby/sapphire bearings, precision shafts and high-performance mechanical components, serving the instrument, automation and aerospace industries. Our core team has decades of experience in Japanese precision machining, ensuring outstanding quality and reliability in every product.

🌏 Overseas sales and technical support is provided by METICULAB™ (Korea).

TAOMSUN

Precision Bearing Components

📧 Sales Inquiry

taomsun@vip.163.com

+86-13862625813

🌏 Overseas Sales / Technical Support

METICULAB™ (Korea)

choikyuc@gmail.com

+82-10-3988-4813

💬 WhatsApp / KakaoTalk

TAOMSUN products are manufactured under the ISO 9001 quality management system. Specifications are typical values and may vary with custom configurations. For OEM / ODM customization, non-standard sizes or special hole designs, please contact our sales team. Overseas customers may contact METICULAB (Korea) for Korean / English technical consultation.