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Three Bolt Flange Mount Bearings Wholesale

Three Bolt Flange Mount Bearings Specifications

Comprehensive technical reference for round housing pump, blower, and fan applications.

Material & Mounting Properties

Bearing Unit TypeThree Bolt Round Flange, Self-Aligning
Insert Bearing MaterialGCr15 Chrome Steel
Housing MaterialCast Iron (FC200) or Pressed/Machined Steel
Shaft Lock TypeSetscrew Collar or Eccentric Collar
SealingTriple-Lip Contact Seal
Self-Alignment±2-3° Spherical Outer Race

Performance Characteristics

Bore Range12mm - 80mm (Common Sizes)
Temperature Range-20°C to +100°C
LubricationRe-Greasable via Zerk Fitting
Load RatingLight to Medium Duty
Speed RatingUp to 5,500 RPM (bore dependent)
Mounting PatternTriangular Three-Bolt Circle

Ideal Applications

Applications where round housing geometry favors triangular three-bolt mounting.

Centrifugal Pump Shaft Support

Pump volute end bell mounting uses three bolt flange units matched to the round pump housing bolt circle for direct, balanced shaft support.

Industrial Blower & Fan Housings

Centrifugal blower and fan scroll housings use three bolt flange bearings for compact mounting that matches the circular housing profile.

HVAC Air Handler Shaft Mounting

Air handling unit fan shafts use three bolt flange units for reliable mounting within the compact circular housing constraints of HVAC equipment.

Small Pump & Circulator Assemblies

Water circulator pumps and small process pumps use three bolt flange bearings sized for compact housing integration and easy field replacement.

Agricultural Blower & Grain Fan Systems

Grain drying blower and aeration fan systems use three bolt flange units for reliable, self-aligning shaft support in round fan housing designs.

Dust Collection System Fan Mounting

Industrial dust collector exhaust fan shafts use three bolt flange bearings matched to the round fan housing mounting configuration.

Superior Advantages

Balanced mounting meets compact round housing compatibility.

Balanced

Triangular Bolt Load Distribution

The three-point mounting pattern distributes clamping load evenly around the bearing centerline, avoiding the asymmetric loading of other bolt patterns.

2-3°

Self-Alignment Capability

Spherical outer race design accommodates shaft misalignment and mounting surface irregularity common in cast pump and blower housings.

Compact

Round Housing Footprint

The circular housing profile matches naturally with pump volute and blower scroll housing geometry for direct, space-efficient integration.

Re-Greasable

Extended Service Life

Standard zerk fitting allows periodic re-lubrication in the field, extending service life well beyond the initial factory grease fill.

Shipping & Payment

Global logistics for three Bolt Flange Mount 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 Bore Sizes: 12 – 20 days.

Eccentric Collar Variant: 18 – 25 days.

Custom Bolt Circle Match: 25 – 35 days.

Frequently Asked Questions

Expert answers about three Bolt Flange Mount Bearings.

Q: Why choose a three bolt flange over a two bolt or four bolt flange unit?

A: Three bolt round flange units are specifically suited to circular equipment housings like pump volutes and blower scrolls, where the round profile and triangular bolt pattern integrate more naturally than the oval two-bolt or rectangular four-bolt alternatives designed for flat frame mounting applications.

Q: How much shaft misalignment can these units accommodate?

A: The spherical outer race design typically accommodates 2-3 degrees of angular misalignment, sufficient to compensate for the perpendicularity variation common in cast pump and blower housing mounting bosses.

Q: Should I choose cast iron or steel housing for a pump application?

A: Cast iron is recommended for higher-pressure industrial pumps and blowers requiring maximum rigidity and load capacity. Pressed or machined steel suits lighter-duty circulator pumps and lower-pressure fans where reduced weight and cost are prioritized.

Q: Can these units be re-greased without removing them from the pump housing?

A: Yes, standard units include a zerk grease fitting accessible from outside the housing, allowing periodic re-lubrication with a standard grease gun without disassembling the pump or fan housing.

Q: Why is an eccentric locking collar often recommended for pump and blower applications?

A: Centrifugal pumps and blowers often experience continuous rotating imbalance and vibration characteristics that benefit from the superior grip and vibration resistance of eccentric locking collars compared to standard setscrew collars, reducing the risk of shaft slippage over extended operation.

Q: What bolt circle diameter and hole spacing are standard for three bolt flange units?

A: Bolt circle diameter and hole spacing follow common pump and blower industry mounting standards for each bore size range; custom bolt circle matching is available for OEM equipment with non-standard mounting patterns.

Q: What seal type protects against pump housing moisture exposure?

A: Standard sealing is a triple-lip contact seal design, providing multiple sealing barriers appropriate for the moisture and occasional splash exposure common in pump and blower housing environments.

Q: What is the maximum recommended speed for three bolt flange units?

A: Maximum speed varies by bore size, typically up to approximately 5,500 RPM for smaller bores, suitable for the operating speed range of most centrifugal pump and blower applications.

Q: What is the minimum order quantity for three bolt flange bearings?

A: Standard MOQ is 100 pieces for common stocked bore sizes and housing configurations. Custom bolt circle diameter or specialized housing material requires a minimum order of 300 pieces.

Q: Can you match units to my existing pump or blower manufacturer's mounting pattern?

A: Yes, we can reverse-engineer bolt circle diameter, hole spacing, and housing dimensions from a sample unit or manufacturer drawing to produce compatible replacement parts.

Q: Do you offer stainless steel three bolt flange units for washdown pump applications?

A: Yes, stainless steel insert bearings and housings are available for washdown or corrosive pump environment applications, at a cost premium over standard cast iron or steel configurations.

Q: What documentation is provided for pump OEM engineering integration?

A: Load rating tables, bolt circle drawings, and installation guidelines are provided with every order to support your pump or blower OEM engineering integration process.

General Information

Key specifications and ordering details.

MOQ100 Pieces (Custom: 300)
Lead Time12 – 35 Days
PackagingBulk Carton / Individual Box
CertificationsISO 9001
MaterialsCast Iron / Steel Housing, Chrome Steel Insert
CustomizationBore Size, Collar Type, Bolt Circle
Zhejiang Yingfei Biotechnology Co., Ltd.
ABOUT US
Zhejiang Yingfei Biotechnology Co., Ltd. is China Three Bolt Flange Mount Bearings Manufacturers and Wholesale Three Bolt Flange Mount 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

Three Bolt Flange Unit Reliability Assurance

Rigorous quality protocols ensure balanced mounting and long-term pump/blower shaft support reliability.

1

Spherical Bore Alignment Verification

Housing spherical bore and insert bearing outer race are matched and tested to confirm smooth self-alignment rotation within the specified angular range.

2

Bolt Circle Dimensional Verification

CMM measurement confirms bolt circle diameter and hole spacing match standard pump and blower industry mounting patterns before shipment.

3

Seal Integrity & Grease Fill Verification

Triple-lip seals and grease fill quantity are inspected on every unit to confirm contamination protection and adequate initial lubrication.

Testing & Certifications

Comprehensive testing protocols for three bolt flange bearing unit validation.

1

Self-Alignment Range Testing

Units are tested through their full angular alignment range to confirm smooth rotation without binding at the rated misalignment tolerance.

2

Shaft Collar Pull-Off Torque Test

Locking collar holding force is measured to confirm setscrew or eccentric collar grip exceeds the minimum specification for the rated load.

3

Housing Load Capacity Testing

Sample housings are tested under rated static and dynamic load to confirm structural integrity of the cast iron or steel construction.

4

Bolt Circle Pattern Inspection

CMM measurement confirms bolt circle diameter, hole spacing, and overall housing dimensions conform to standard pump and blower mounting patterns.

5

Seal Contamination Ingress Testing

Triple-lip seals undergo moisture and dust chamber testing to verify contamination protection meets specification for pump housing environments.

6

Vibration Resistance Testing

Units are tested under simulated centrifugal pump vibration conditions to confirm collar locking mechanism retains shaft grip under continuous operation.

Three Bolt vs Four Bolt Round Flange Bearing Unit Comparison

Understand when the three-bolt pattern is the right choice for round housing mounting.

Feature Four Bolt Round Flange Unit Three Bolt Round Flange (Our Grade)
Mounting Footprint Larger, Four-Point Pattern Compact, Three-Point Pattern
Bolt Load Distribution Higher Rigidity, More Hardware Balanced, Fewer Fasteners
Housing Compatibility General Round Housings Pump Volute / Blower Scroll Optimized
Installation Speed Moderate (4-Bolt Alignment) Faster (3-Bolt, Fewer Fasteners)
Best Application Heavier Fixed Round Mounting Pump, Blower, Fan Housing Mounting
Cost Slightly Higher (More Hardware) Lower (Simplified Mounting)
Expert Insight: Four bolt round flange units remain preferable for heavier fixed machinery mounting where maximum bolt count and rigidity are the priority. Three bolt flange units are the industry-standard choice specifically for pump, blower, and fan housing applications, where their triangular pattern naturally matches common housing bolt circle designs, reduces fastener count and installation time, and still provides balanced load distribution fully adequate for the moderate loads typical of pump and blower shaft support.
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 Three Bolt Flange Unit Customization

Three bolt flange mount bearings can be tailored in bore size, housing material, and bolt circle pattern to match your specific pump, blower, or fan housing mounting requirements. We provide full engineering support from specification through installation documentation.

  • 1Housing & Shaft Assessment: Review your pump or blower housing bolt circle, shaft diameter, and load requirements to recommend optimal bore size and configuration.
  • 2Housing Material Selection: Confirm cast iron or steel housing based on load capacity requirements and pump or blower pressure classification.
  • 3Bolt Circle Pattern Matching: Reverse-engineer or design bolt circle diameter and hole spacing to match your specific housing mounting interface.
  • 4Shaft Lock Mechanism Selection: Choose setscrew or eccentric locking collar based on your pump or blower's vibration and imbalance characteristics.
  • 5Prototype Sample Validation: Sample units manufactured and tested for alignment, load capacity, and seal performance before bulk production.
  • 6Production Casting/Machining Setup: Housing manufacturing tooling configured for your exact bore size and bolt circle pattern specifications.
  • 7Batch Alignment & Load Verification: Ongoing self-alignment and collar torque sampling throughout production runs for consistent quality.
  • 8Technical Documentation: Full load rating tables and installation guidelines provided for your pump or blower OEM engineering integration records.

Need Compact, Balanced Shaft Support for Pump or Blower Housings?

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