The NTN UC215-300D1 is a large-size UC-series insert bearing designed for mounted-bearing applications using a 3 inch shaft.

The bearing uses a wide inner ring extending beyond the outer ring on both sides and is secured directly to the shaft using two set screws.

Its spherical outside diameter allows the insert to seat in a compatible spherical housing such as:

• P215 pillow block housing
• F215 square flange housing
• Other compatible 215-series mounted-bearing housings

When assembled with the corresponding housing, common unit references include:

UCP215-300 – Pillow Block Unit
UCF215-300 – Square Flange Unit

⚙️ Applications

• Heavy conveyor systems
• Agricultural machinery
• Bulk material handling
• Industrial fans and blowers
• Large roller assemblies
• Processing machinery
• Packaging and production equipment
• Power-transmission systems
• Pillow block units
• Flange bearing units
• General industrial mounted-bearing systems

🎯 Benefits

✔ Full 3 inch shaft bore

✔ Large 130 mm spherical OD

✔ Wide inner-ring design

✔ Two set screws for direct shaft locking

✔ Double-sealed with slinger protection

✔ Helps retain grease and exclude contamination

✔ Relubricatable through compatible housing systems

✔ Suitable for heavy mounted-bearing applications

✔ Compatible with 215-series housings when dimensions match

🧠 Technical Insight

• NTN UC215-300D1
• UC215-3
• UC215-48
• 3 in Bore
• 76.20 mm Bore
• 130 mm Outside Diameter
• 77.8 mm Inner Ring Width
• Two Set Screw Locking
• Double Seal with Slinger
• Relubricatable

✅ Key Features

• NTN Premium Insert Bearing
• Model UC215-300D1
• UC215 Series
• Inch-Bore Configuration
• Wide Inner Ring
• Spherical Outer Ring
• Two Set Screws
• Double-Sealed with Slinger
• Relubricatable Design

📊 Specifications

Brand: NTN

Primary Model / Bearing Number: UC215-300D1

Alternative References: UC215-3 / UC215-48

Product Type: Insert Ball Bearing

Bearing Series: UC215

Bearing Type: Wide Inner Ring Insert Ball Bearing

Bore Diameter (d): 3.000 in / 76.20 mm

Outside Diameter (D): 130.00 mm

Inner Ring Width (B): 77.80 mm

Outer Ring Width (C): 30.00 mm

Rolling Elements: Ball

Number of Rows: 1

Outer Ring: Spherical OD

Inner Ring: Wide / extended on both sides

Locking Method: Two Set Screws

Seal Type: Double-Sealed with Slinger

Seal Function: Helps exclude dust, dirt, and contamination while retaining grease

Lubrication: Grease-lubricated insert bearing

Relubricatable: Yes, when used with a compatible housing and grease passage

Internal Clearance: Verify exact NTN UC215-300D1 specification if critical

Cage: Verify current NTN production specification

Load Rating: Verify NTN data for the exact UC215-300D1 execution

Speed Rating: Verify NTN data for the exact operating condition

Shaft Fit: Nominal 3 in / 76.2 mm shaft

Housing Fit: Compatible with appropriately dimensioned 215-series spherical-seat housings

Installation Consideration: Seat the bearing correctly in the housing, align the shaft, tighten both set screws evenly to the specified torque, and ensure the grease passage aligns correctly when relubrication is required

🔁 Equivalent

Suitable replacement or cross-reference search terms include:

• NTN UC215-300D1
• NTN UC215-3
• UC215-48
• 3 in Bore UC215 Insert Bearing
• 76.2 mm Bore Insert Bearing
• 130 mm OD Insert Bearing
• Set Screw Locking Insert Bearing
• 215-Series Inch-Bore Bearing
• UCP215-300 Insert
• UCF215-300 Insert

Important Coding Note

The following references can appear for the same nominal shaft size:

UC215-300D1 → NTN full inch-bore designation
UC215-3 → simplified market reference
UC215-48 → 48/16 in = 3 in market coding used by some suppliers

For SEO and product search, it is useful to include all three references.

UC215-300D1 vs Metric UC215

The important distinction is the shaft bore.

UC215-300D1: 3 in = 76.20 mm bore

A metric UC215 variant may use a different shaft bore while retaining a similar 215-series outside body.

Therefore, the suffix should always be checked before ordering.

Double Seal with Slinger

The sealing arrangement combines contact seals with rotating slingers.

The slingers help deflect contamination away from the seal area before it reaches the bearing interior.

This helps protect against:

• Dust
• Dirt
• Fibers
• Debris
• Grease loss
• External contamination

Relubricatable Design

The UC215-300D1 can be used in a relubricatable mounted-bearing system when the housing provides the correct grease path.

Benefits include:

• Grease replenishment during maintenance
• Better suitability for long operating hours
• Improved contamination management
• Longer service potential when correctly maintained

Overgreasing should be avoided because excessive grease can increase churning, temperature, and seal stress.

Important Cross-Reference Consideration

A replacement should not be selected solely from:

3 in bore + 130 mm OD

Also verify:

• Inner ring width = 77.8 mm
• Outer ring width = 30 mm
• Spherical OD geometry
• Set screw position and thread
• Seal and slinger configuration
• Grease-hole position
• Internal clearance
• Load rating
• Speed capability
• Housing compatibility

(Always verify the complete UC215-300D1 specification and original housing before selecting another brand as a replacement.)

📦 Availability

✅ In Stock

🚚 Fast Delivery Available

🌎 Worldwide Shipping Available

📦 MOQ: 1 Piece

🏭 Suitable for pillow blocks, flange units, heavy conveyors, agricultural machinery, rollers, processing equipment, material-handling systems, and mounted-bearing applications requiring a 3 inch set-screw insert bearing with 130 mm spherical OD.

📲 Contact via LINE ID: dusitrea

📧 Email: sales@seal4go.com

💬 Technical support available before ordering

🔍 Assistance available for cross-reference and equivalent part identification