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Precision Ground Flange Ball Bearings Wholesale

Precision Ground Flange Ball Bearings Specifications

Comprehensive technical reference for precision spindle and instrument mounting applications.

Material & Precision Flange Properties

Bearing TypeIntegrated Flange, Ground Outer Ring
Ring & Ball MaterialGCr15 Chrome Steel
HardnessHRC 60 - 64
Flange Squareness±0.002-0.005mm
Bolt PatternCounterbored or Through-Hole
Cage MaterialPhenolic, Brass, or Steel

Performance Characteristics

Precision GradeP4, P5 (ABEC-7, 5)
Raceway Surface FinishRa 0.1µm
Radial ClearanceC2 Standard, Custom Available
Speed RatingUp to 15,000 RPM (size dependent)
Temperature Range-20°C to +100°C
Direct MountNo Separate Housing Required

Ideal Applications

Applications where flange mounting accuracy directly determines system performance.

Machine Tool Spindle Front Bearings

CNC spindle nose bearings use precision flange units for direct, repeatable axial location without the stack-up error of a separate housing.

Optical Positioning Stages

Precision optical instrument stages use flange bearings for accurate, repeatable rotational positioning in metrology and imaging equipment.

Robotic Joint Mounting

Precision robotic arm joints use integrated flange bearings for compact, accurate mounting where positional repeatability affects overall robot accuracy.

Semiconductor Handling Equipment

Wafer handling and inspection equipment uses precision flange bearings for the sub-micron positional accuracy required in semiconductor processing.

Coordinate Measuring Machine Axes

CMM rotational axes use precision ground flange bearings to maintain measurement accuracy across the machine's working envelope.

Medical Imaging Equipment Rotation

CT and imaging equipment rotating gantries use precision flange bearings for smooth, accurately located rotation critical to image quality.

Superior Advantages

Eliminated stack-up tolerance meets true positional repeatability.

±0.002mm

Flange Squareness

Coordinated grinding of flange face and raceways in a single setup achieves tighter squareness than separately manufactured housing assemblies.

Zero

Housing Stack-Up Error

Integrated flange construction eliminates the accumulated tolerance of press-fitting a separate bearing into a housing, improving positional accuracy.

P4/P5

Precision Grade Standard

Full P4/P5 internal precision matches our high-speed bearing line, combining rotational accuracy with precise flange location in one component.

Direct-Mount

Simplified Installation

No separate housing machining required—the integrated flange mounts directly to a machined face, simplifying customer assembly and reducing part count.

Shipping & Payment

Global logistics for precision Ground Flange Ball Bearings orders.

Payment Terms

T/T (Wire Transfer): 30% deposit, 70% upon shipment.

L/C at Sight: Accepted for orders exceeding 5,000 pieces.

Open Account: Available for long-term OEM customers.

Shipping Methods

Sea Freight: FCL/LCL from Shanghai or Ningbo for bulk orders.

Air Express: DHL/FedEx for urgent samples and small batches.

Lead Time

Standard Flange Sizes: 20 – 30 days.

Custom Bolt Pattern: 30 – 40 days.

P4 Precision Grade Certification: 35 – 45 days.

Frequently Asked Questions

Expert answers about precision Ground Flange Ball Bearings.

Q: How is a precision ground flange bearing different from a standard flange bearing unit?

A: Standard flange units (like our two bolt or three bolt flange bearings) use a separate cast or stamped housing pressed onto an insert bearing, introducing stack-up tolerance. Precision ground flange bearings integrate the flange directly into the ground outer ring in a single machining setup, eliminating that stack-up error for applications requiring tighter positional accuracy.

Q: What applications actually need this level of flange precision?

A: Applications where mounting misalignment directly translates to system-level error—machine tool spindles, optical positioning equipment, semiconductor handling, and precision measurement instruments—benefit meaningfully from integrated flange precision. General-purpose shaft support does not require this level of accuracy.

Q: Can these bearings be installed without additional housing hardware?

A: Yes, the integrated flange mounts directly to a customer-machined mounting face using the flange's bolt pattern, eliminating the need for a separate housing component altogether.

Q: Are precision ground flange bearings significantly more expensive than standard flange units?

A: Yes, due to the more complex coordinated grinding process required to achieve integrated flange squareness, these bearings typically cost 3-5x standard cast housing flange units, reflecting the precision manufacturing investment.

Q: How is flange-to-raceway concentricity achieved during manufacturing?

A: The flange face and bearing raceways are ground in the same fixture setup relative to a common datum, ensuring concentricity is controlled by a single precision grinding operation rather than the assembly tolerance of separate components.

Q: What bolt pattern options are available for the mounting flange?

A: Both counterbored (flush-mount) and through-hole bolt patterns are available, matched to common spindle and instrument mounting standards, with custom bolt circle diameter and hole count available for OEM-specific mounting requirements.

Q: What cage materials are available and how do they affect performance?

A: Phenolic cages offer excellent high-speed performance with low mass; brass cages offer superior strength and thermal stability for heavier preload applications; steel cages offer cost efficiency for moderate speed requirements. Selection depends on your specific speed and load profile.

Q: Can these bearings be preloaded for zero-clearance precision applications?

A: Yes, matched bearing pairs with specified preload class are available for applications requiring zero axial and radial play, such as high-precision spindle configurations requiring maximum stiffness and positional accuracy.

Q: What is the minimum order quantity for precision ground flange bearings?

A: Standard MOQ is 20 pieces for stocked flange sizes and bolt patterns. Custom flange dimensions or bolt patterns require a minimum order of 50 pieces due to dedicated grinding fixture setup.

Q: Can you provide dimensional inspection reports with each shipment?

A: Yes, full CMM dimensional inspection reports documenting flange squareness, raceway concentricity, and precision grade compliance are provided with every precision flange bearing shipment.

Q: Do you offer matched sets for preloaded spindle applications?

A: Yes, matched bearing pairs or sets ground to complementary preload specifications are available for spindle and instrument applications requiring controlled preload configuration.

Q: What is the typical lead time for a custom flange bolt pattern?

A: Custom bolt pattern flange bearings typically require 30-40 days including fixture design, coordinated grinding setup, and first-article dimensional verification before production release.

General Information

Key specifications and ordering details.

MOQ20 Pieces (Custom: 50)
Lead Time20 – 45 Days
PackagingIndividual Protective Case
CertificationsISO 9001 / Full Dimensional Inspection Report
MaterialsGCr15 Chrome Steel
CustomizationBolt Pattern, Cage Material, Preload Class
Zhejiang Yingfei Biotechnology Co., Ltd.
ABOUT US
Zhejiang Yingfei Biotechnology Co., Ltd. is China Precision Ground Flange Ball Bearings Manufacturers and Wholesale Precision Ground Flange Ball Bearings Factory that combines industry and trade. Its subsidiary, Ningbo Kaifei Machinery Technology Co., Ltd., has passed the GB/T 19001-2016/ISO 9001:2015 international quality system certification and is committed to producing precision bearings and fasteners made of stainless steel, carbon steel, and bearing steel. The company uses high-quality steel materials and implements fine craftsmanship production processes. It is a diversified and professional production base for casting in China, based on high-end and high-end markets, with an annual output of 2400000 sets. It is mainly exported to dozens of countries in Europe, America, Asia, Africa, and other regions, and is widely used in the fields of motors, home appliances, sports equipment, automobiles, mechanical rotation, furniture, strollers, water pumps, toys, etc. Our company adheres to the business philosophy of "paying attention to details, integrity, and efficiency". While developing, we continuously strengthen and enrich our company's technical strength, improve and perfect after-sales service, logistics distribution, and market promotion. Ensure high-quality products and a reliable reputation to serve domestic and international markets. Standardize oneself, be meticulous, strictly demand, and enhance the understanding and trust of partners. Establish good cooperative relationships with customers.
01

10 YEARS INDUSTRY EXPERIENCE

02

8700m² advanced factory

03

15 high-tech professionals

04

Annual production: 2.4 million sets

Precision Flange Manufacturing Assurance

Rigorous quality protocols ensure integrated flange squareness and rotational precision.

1

Coordinated Flange & Raceway Grinding

Flange face and raceways are ground in a single fixture setup to eliminate stack-up tolerance and achieve target squareness and concentricity.

2

Precision Bore & Bolt Pattern Verification

CMM inspection confirms bore dimensions and bolt hole pattern location meet the specified precision grade before final assembly.

3

Running Accuracy & Preload Testing

Finished bearings undergo runout and preload testing to confirm rotational accuracy meets P4/P5 precision grade specification.

Testing & Certifications

Comprehensive testing protocols for precision flange bearing validation.

1

Flange Squareness Measurement

CMM inspection confirms flange face squareness to the bearing bore axis falls within the ±0.002-0.005mm specification for the ordered precision grade.

2

Flange-to-Raceway Concentricity Test

Precision measurement verifies the mounting flange is concentric with the bearing raceways to ensure accurate positional location upon installation.

3

Radial & Axial Runout Testing

Finished bearings are tested for radial and axial runout to confirm compliance with P4 or P5 precision grade rotational accuracy requirements.

4

Raceway Surface Finish Verification

Profilometer measurement confirms raceway surface finish meets the Ra 0.1µm specification essential for low-friction, low-vibration precision rotation.

5

Bolt Hole Pattern Dimensional Check

CMM measurement confirms bolt circle diameter, hole count, and hole position match the specified mounting pattern within tolerance.

6

Preload & Stiffness Verification

For matched bearing sets, preload force and resulting system stiffness are verified to confirm compliance with the specified preload class.

Precision Ground Flange vs Standard Flange Housing Unit Comparison

Understand when integrated flange precision is worth the investment.

Feature Standard Cast Housing Flange Unit Precision Ground Flange (Our Grade)
Flange Squareness Assembly-Tolerance Dependent ±0.002-0.005mm Ground
Positional Stack-Up Error Present (Housing + Bearing) Eliminated (Integrated)
Precision Grade P0 Typical P4, P5 Available
Best Application General Shaft Support Spindle / Optical / Instrument
Installation Housing + Insert Bearing Direct Mount, No Housing
Cost Multiplier 1.0x (baseline) 3.0-5.0x
Expert Insight: Standard cast housing flange units remain the appropriate and economical choice for general shaft support applications like conveyors and agricultural equipment, where positional accuracy in the micron range is simply not relevant to performance. Precision ground flange bearings exist specifically for the smaller set of applications—machine tool spindles, optical instruments, semiconductor equipment—where mounting stack-up error directly degrades system-level precision, and where the substantial cost premium is justified by the performance requirement.
Quality Creates The Future
  • .01 Comprehensive Customization:

    We provide full-process customization services from product design, material selection, sample making to mass production to meet customers' special specifications and functional requirements.

  • .02 Flexible Production Capacity:

    With an advanced production base of 8,700 square meters and rich technical experience, we are able to respond quickly to customer needs, whether it is small batch customization or large-scale mass production.

  • .03 Quality Assurance:

    We strictly follow the GB/T 19001-2016/ISO9001:2015 quality management system. Each customized product undergoes strict quality inspection to ensure that it meets the high standards of customers.

  • .04 Experienced Technical Team:

    Our internal technical team consists of experienced engineers and designers who can provide professional technical support to help you optimize product design and improve production efficiency.

  • .05 Global Service Network:

    We have a stable supply chain and sales network around the world to ensure that your products can enter the market quickly and receive timely after-sales service.

About Precision Flange Bearing Customization

Precision ground flange ball bearings can be engineered in bolt pattern, precision grade, cage material, and preload class to match your specific spindle or instrument mounting requirements. We provide full engineering collaboration from design review through delivery.

  • 1Application Precision Requirement Review: Assess your system's positional accuracy and rotational precision needs to confirm P4 or P5 grade requirement.
  • 2Flange Bolt Pattern Design: Confirm bolt circle diameter, hole count, and counterbore or through-hole configuration to match your mounting interface.
  • 3Cage Material & Preload Selection: Select cage material and, if required, matched-pair preload class based on your speed and stiffness requirements.
  • 4Coordinated Grinding Fixture Design: Custom grinding fixtures engineered to achieve your specified flange squareness and concentricity tolerance.
  • 5First-Article Dimensional Verification: Initial samples fully CMM-inspected and provided with dimensional reports for your engineering approval.
  • 6Production Grinding Setup: Coordinated flange and raceway grinding tooling configured for consistent production of your exact specification.
  • 7Batch Precision Sampling: Ongoing squareness, concentricity, and runout sampling throughout production to maintain precision grade consistency.
  • 8Technical Documentation: Full dimensional inspection reports and precision grade certification provided for your engineering and quality records.

Need True Positional Precision in Your Flange Mounting?

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