SY25TF SKF 2 Bolt Plummer Block Y Bearing with Grub Screws 25mm

The SKF SY25TF is a high-performance pillow block ball bearing unit engineered to provide reliable shaft support in industrial, agricultural, and material handling applications. Supplied as a complete ready-to-install assembly, the unit combines the SKF YAR 205-2F insert bearing with the robust SY 505 M cast iron housing, delivering exceptional durability, simplified installation, and long service life.

Designed for 25mm shaft diameters, the SY25TF features an extended inner ring with a dual set screw locking arrangement, providing secure shaft retention and dependable operation in applications subjected to vibration, shock loads, and varying operating conditions. The unit is suitable for use with both constant and alternating directions of rotation.

The bearing insert is factory lubricated and equipped with contact seals and protective flingers on both sides, helping to prevent contamination ingress while retaining lubricant within the bearing. A grease fitting and relubrication facility are included as standard, allowing routine maintenance to maximise bearing life and minimise downtime.

Manufactured from high-quality bearing steel and housed within a rugged cast iron plummer block, the SY25TF incorporates SKF's self-aligning bearing design to accommodate minor shaft misalignment and mounting inaccuracies while maintaining smooth, efficient operation.

Features & Benefits

• Complete ready-to-mount pillow block bearing unit
• Designed for 25mm shaft diameters
• Heavy-duty cast iron housing construction
• SKF YAR 205-2F insert bearing included
• Extended inner ring with dual set screw locking
• Suitable for constant and reversing shaft rotation
• Factory lubricated for immediate installation
• Contact seals and flingers on both sides
• Relubrication facility with grease nipple supplied
• Self-aligning spherical seating arrangement
• Accommodates minor shaft misalignment
• Designed to ISO standards
• Optional end cover available (ECY 205)
• Excellent resistance to vibration and contamination

Technical Specifications

Bearing Unit Design

• Manufacturer: SKF
• Part Number: SY25TF
• Housing Type: Pillow Block Bearing Unit
• Housing Reference: SY 505 M
• Bearing Reference: YAR 205-2F
• Standard: ISO
• Bore Type: Cylindrical
• Shaft Locking Method: Set Screws
• Housing Material: Cast Iron
• Bearing Material: Bearing Steel
• Coating: None
• Rubber Seating Ring: No

Dimensions

• Shaft Diameter (d): 25mm
• Inner Ring Shoulder Diameter (d1): 35.4mm
• Base Width (A): 34mm
• Top Width (A1): 22mm
• End Cover Projection (A5): 24mm
• Inner Ring Width (B): 34.1mm
• Distance to Thread Centre (B4): 5.5mm
• Centre Height (H): 36.5mm
• Foot Height (H1): 15mm
• Overall Height (H2): 72mm
• Bolt Hole Centres (J): 104mm
• Maximum Bolt Centre Distance (Jmax): 116mm
• Minimum Bolt Centre Distance (Jmin): 92mm
• Overall Length (L): 140mm
• Bolt Hole Diameter (N): 14mm
• Bolt Slot Length (N1): 21mm
• Raceway Centre Distance (s1): 19.8mm

Lubrication & Sealing

• Lubricant: Grease
• Relubrication Facility: Yes
• Grease Fitting: Included
• Grease Fitting Thread: 1/4-28 SAE-LT
• Housing Grease Port Thread: 1/4-28 UNF
• Bearing Seal Arrangement: Seal and Flinger on Both Sides
• Seal Type: Standard Contact Seal
• Optional Unit Sealing: End Cover ECY 205

Performance Data

• Basic Dynamic Load Rating (C): 14.0 kN
• Basic Static Load Rating (C₀): 7.85 kN
• Fatigue Load Limit (Pu): 0.335 kN
• Limiting Speed: 7,800 rpm
• Limiting Speed Based On: h6 Shaft Tolerance

Mounting Information

• Set Screw Size: M6 x 0.75
• Hex Key Size: 3mm
• Recommended Set Screw Tightening Torque: 4 Nm
• Recommended Attachment Bolt Diameter: 12mm (7/16")

Additional Data

• Number of Mounting Holes: 2
• Mounting Hole Type: Plain
• Unit Weight: Approximately 0.74kg
• eClass Code: 23-05-08-02
• UNSPSC Code: 31171536

Typical Applications

The SKF SY25TF pillow block bearing unit is widely used in conveyor systems, agricultural machinery, packaging equipment, food processing plants, material handling systems, manufacturing equipment, textile machinery, and general industrial applications requiring dependable shaft support and low-maintenance operation.

Manufactured to SKF's exacting quality standards, the SY25TF delivers outstanding reliability, effective contamination protection, easy installation, and extended service life, making it an ideal bearing solution for demanding industrial environments.