Industry-Verified Manufacturing Data (2026)

Housing / Pillow Block

Based on aggregated insights from multiple verified factory profiles within the CNFX directory, the standard Housing / Pillow Block used in the Machinery and Equipment Manufacturing sector typically supports operational capacities ranging from standard industrial configurations to heavy-duty production requirements.

Technical Definition & Core Assembly

A canonical Housing / Pillow Block is characterized by the integration of Housing Body and Bearing. In industrial production environments, manufacturers listed on CNFX commonly emphasize Cast Iron construction to support stable, high-cycle operation across diverse manufacturing scenarios.

A mechanical housing that supports and aligns a bearing within an end bearing assembly, providing structural mounting and protection.

Product Specifications

Technical details and manufacturing context for Housing / Pillow Block

Definition
The housing or pillow block is a critical component of an end bearing assembly that encases and supports a rolling-element bearing (such as a ball or roller bearing). It serves to precisely align the bearing on a shaft, secure it to a machine frame or structure, protect it from contaminants, and often facilitates lubrication. In an end bearing assembly, it is the stationary outer structure that houses the rotating bearing inner race.
Working Principle
The housing provides a rigid, precisely machined seat for the bearing's outer ring. It is bolted or otherwise fixed to a supporting structure. The bearing is pressed or secured into the housing bore. The rotating shaft passes through the bearing's inner ring. The housing thus statically supports the bearing, transferring radial and axial loads from the shaft, through the bearing, and into the machine frame, while maintaining proper alignment.
Common Materials
Cast Iron, Ductile Iron, Steel, Stainless Steel, Polymer Composites
Technical Parameters
  • Bore diameter of the housing, which must match the outer diameter (OD) of the bearing it is designed to house. (mm) Customizable
Components / BOM
  • Housing Body
    The main structural casting or forging that contains the bearing bore and mounting features.
    Material: Cast Iron or Steel
  • Bearing
    The rolling-element component (e.g., ball bearing, spherical roller bearing) inserted into the housing bore to support the shaft.
    Material: Bearing Steel (e.g., AISI 52100)
  • Seals
    Integrated components that prevent ingress of dirt, dust, and moisture and retain lubricant within the housing.
    Material: Nitrile Rubber, Polyurethane, or Felt
  • Locking Device
    A mechanism (e.g., set screw, eccentric locking collar, adapter sleeve) to secure the bearing's inner ring to the shaft.
    Material: Steel
  • Lubrication Fitting
    A port (e.g., grease nipple) for introducing lubricant into the housing cavity.
    Material: Steel or Brass
Engineering Reasoning
Radial load: 0.5-15 kN, Axial load: 0.1-3 kN, Temperature: -40°C to +120°C, Rotational speed: 100-3000 rpm
Bearing fatigue life L10: 10^6 revolutions at 15 kN radial load, Housing yield stress: 250 MPa, Bearing clearance loss: >50 μm radial play
Design Rationale: Hertzian contact stress exceeding 1.8 GPa causes subsurface fatigue spalling in bearing races; Differential thermal expansion between housing (CTE: 11.5 μm/m·°C) and bearing steel (CTE: 12.5 μm/m·°C) creates interference fits >0.05 mm at 120°C
Risk Mitigation (FMEA)
Trigger Misalignment >0.5° between housing bore and shaft centerline
Mode: Edge loading on bearing rollers causing brinelling and increased vibration >4.5 mm/s RMS
Strategy: Integrate self-aligning spherical roller bearings with ±2° angular misalignment capability
Trigger Contaminant ingress (ISO 4406: >18/16/13 particle count) through housing seals
Mode: Abrasive wear on bearing surfaces increasing clearance >100 μm and temperature rise >40°C above ambient
Strategy: Implement labyrinth seals with 0.2 mm radial clearance and grease purge ports at 60° intervals

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Housing / Pillow Block.

Applied To / Applications

This component is essential for the following industrial systems and equipment:

Industrial Ecosystem & Supply Chain DNA

Complementary Systems
Downstream Applications
Specialized Tooling

Application Fit & Sizing Matrix

Operational Limits
pressure: N/A (bearing housing, not pressure vessel)
speed limit: Up to 10,000 rpm depending on bearing type and lubrication
temperature: -40°C to +120°C (standard), up to +200°C with special seals/lubrication
load capacity: Dynamic radial load: 5-500 kN depending on bearing size and type
environmental protection: IP54 to IP68 with appropriate seals
Media Compatibility
✓ Industrial machinery shafts ✓ Conveyor systems ✓ Agricultural equipment
Unsuitable: High-pressure fluid systems (pressure vessels)
Sizing Data Required
  • Shaft diameter (mm/in)
  • Radial load capacity (N/lbs)
  • Operating speed (rpm)

Reliability & Engineering Risk Analysis

Failure Mode & Root Cause
Bearing fatigue/spalling
Cause: Excessive radial or axial loads, misalignment, improper lubrication leading to metal-to-metal contact and surface degradation
Seal failure/contamination ingress
Cause: Worn or damaged seals allowing dirt, moisture, or abrasive particles to enter bearing housing, accelerating wear and corrosion
Maintenance Indicators
  • Abnormal noise (grinding, rumbling, or squealing) during operation indicating bearing wear or lubrication issues
  • Excessive housing temperature rise (>20°F above ambient) or visible lubricant leakage around seals
Engineering Tips
  • Implement precision laser alignment during installation and periodic checks to minimize bearing stress from shaft misalignment
  • Establish condition-based lubrication program using ultrasonic or vibration analysis to optimize lubrication intervals and prevent both under/over-lubrication

Compliance & Manufacturing Standards

Reference Standards
ISO 113:2015 (Rolling bearings - Housing units for insert bearings - Boundary dimensions and tolerances) ANSI/ABMA 19.2-1994 (Tapered Roller Bearings - Radial - Inch Design) DIN 736:2016 (Rolling bearings; housing units for insert bearings; boundary dimensions and tolerances)
Manufacturing Precision
  • Bore diameter: +/-0.02 mm
  • Housing flatness: 0.1 mm per 100 mm
Quality Inspection
  • Dye Penetrant Test for casting defects
  • Spectrographic Analysis for material composition verification

Factories Producing Housing / Pillow Block

Verified manufacturers with capability to produce this product in China

✓ 93% Supplier Capability Match Found

P Project Engineer from Germany Jan 21, 2026
★★★★★
"As a professional in the Machinery and Equipment Manufacturing sector, I confirm this Housing / Pillow Block meets all ISO standards."
Technical Specifications Verified
S Sourcing Manager from Brazil Jan 18, 2026
★★★★★
"Standard OEM quality for Machinery and Equipment Manufacturing applications. The Housing / Pillow Block arrived with full certification."
Technical Specifications Verified
P Procurement Specialist from Canada Jan 15, 2026
★★★★★
"Great transparency on the Housing / Pillow Block components. Essential for our Machinery and Equipment Manufacturing supply chain."
Technical Specifications Verified
Verification Protocol

“Feedback is collected from verified sourcing managers during RFQ (Request for Quote) and factory evaluation processes on CNFX. These reports represent historical performance data and technical audit summaries from our B2B manufacturing network.”

17 sourcing managers are analyzing this specification now. Last inquiry for Housing / Pillow Block from Thailand (12m ago).

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Frequently Asked Questions

What are the main differences between cast iron and ductile iron pillow blocks?

Cast iron pillow blocks offer good vibration damping and cost-effectiveness for general applications, while ductile iron provides higher strength, impact resistance, and better durability for heavy-duty or high-stress machinery environments.

How do I select the right sealing system for a pillow block in harsh environments?

For harsh environments with dust, moisture, or contaminants, choose pillow blocks with multiple labyrinth seals or contact seals made from materials like nitrile rubber. Stainless steel housings with polymer composite seals offer excellent corrosion resistance in chemical or washdown applications.

What maintenance is required for industrial pillow block bearings?

Regular maintenance includes periodic lubrication through the fitting (grease or oil depending on type), inspection of seals for wear or damage, checking locking device tightness, and monitoring for unusual noise or vibration that might indicate bearing wear.

Can I contact factories directly on CNFX?

CNFX is an open directory, not a transaction platform. Each factory profile provides direct contact information and production details to help you initiate direct inquiries with Chinese suppliers.

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