We provide full-process customization services from product design, material selection, sample making to mass production to meet customers' special specifications and functional requirements.
Comprehensive technical reference for round housing pump, blower, and fan applications.
Applications where round housing geometry favors triangular three-bolt mounting.
Pump volute end bell mounting uses three bolt flange units matched to the round pump housing bolt circle for direct, balanced shaft support.
Centrifugal blower and fan scroll housings use three bolt flange bearings for compact mounting that matches the circular housing profile.
Air handling unit fan shafts use three bolt flange units for reliable mounting within the compact circular housing constraints of HVAC equipment.
Water circulator pumps and small process pumps use three bolt flange bearings sized for compact housing integration and easy field replacement.
Grain drying blower and aeration fan systems use three bolt flange units for reliable, self-aligning shaft support in round fan housing designs.
Industrial dust collector exhaust fan shafts use three bolt flange bearings matched to the round fan housing mounting configuration.
Balanced mounting meets compact round housing compatibility.
The three-point mounting pattern distributes clamping load evenly around the bearing centerline, avoiding the asymmetric loading of other bolt patterns.
Spherical outer race design accommodates shaft misalignment and mounting surface irregularity common in cast pump and blower housings.
The circular housing profile matches naturally with pump volute and blower scroll housing geometry for direct, space-efficient integration.
Standard zerk fitting allows periodic re-lubrication in the field, extending service life well beyond the initial factory grease fill.
Global logistics for three Bolt Flange Mount Bearings orders.
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.
Sea Freight: FCL/LCL from Shanghai or Ningbo for bulk orders.
Air Express: DHL/FedEx for urgent samples and small batches.
Standard Bore Sizes: 12 – 20 days.
Eccentric Collar Variant: 18 – 25 days.
Custom Bolt Circle Match: 25 – 35 days.
Expert answers about three Bolt Flange Mount Bearings.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
Key specifications and ordering details.
| MOQ | 100 Pieces (Custom: 300) |
| Lead Time | 12 – 35 Days |
| Packaging | Bulk Carton / Individual Box |
| Certifications | ISO 9001 |
| Materials | Cast Iron / Steel Housing, Chrome Steel Insert |
| Customization | Bore Size, Collar Type, Bolt Circle |
10 YEARS INDUSTRY EXPERIENCE
8700m² advanced factory
15 high-tech professionals
Annual production: 2.4 million sets
Rigorous quality protocols ensure balanced mounting and long-term pump/blower shaft support reliability.
Housing spherical bore and insert bearing outer race are matched and tested to confirm smooth self-alignment rotation within the specified angular range.
CMM measurement confirms bolt circle diameter and hole spacing match standard pump and blower industry mounting patterns before shipment.
Triple-lip seals and grease fill quantity are inspected on every unit to confirm contamination protection and adequate initial lubrication.
Comprehensive testing protocols for three bolt flange bearing unit validation.
Units are tested through their full angular alignment range to confirm smooth rotation without binding at the rated misalignment tolerance.
Locking collar holding force is measured to confirm setscrew or eccentric collar grip exceeds the minimum specification for the rated load.
Sample housings are tested under rated static and dynamic load to confirm structural integrity of the cast iron or steel construction.
CMM measurement confirms bolt circle diameter, hole spacing, and overall housing dimensions conform to standard pump and blower mounting patterns.
Triple-lip seals undergo moisture and dust chamber testing to verify contamination protection meets specification for pump housing environments.
Units are tested under simulated centrifugal pump vibration conditions to confirm collar locking mechanism retains shaft grip under continuous operation.
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) |
We provide full-process customization services from product design, material selection, sample making to mass production to meet customers' special specifications and functional requirements.
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.
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.
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.
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.
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.