SY40TF SKF 2 Bolt Plummer Block Y Bearing with Grub Screws 40mm

The SKF SY40TF is a heavy-duty pillow block ball bearing unit designed to provide reliable shaft support in demanding industrial, agricultural, processing, and material handling applications. Supplied as a complete ready-to-install assembly, the unit combines the SKF YAR 208-2F insert bearing with the robust SY 508 M cast iron housing, delivering excellent load capacity, dependable sealing performance, and long operating life.

Designed for 40mm shaft diameters, the SY40TF features an extended inner ring with dual set screw locking, ensuring secure shaft retention even in applications exposed to vibration, shock loads, and fluctuating operating conditions. Suitable for both continuous and reversing shaft rotation, this bearing unit offers a versatile solution for a wide range of industrial machinery.

The bearing insert is factory lubricated and equipped with contact seals and protective flingers on both sides, helping to retain lubricant while preventing the ingress of contaminants such as dust, dirt, and moisture. A relubrication facility with grease nipple is included as standard, enabling routine maintenance and helping maximise service life.

Manufactured from premium bearing steel and housed within a rugged cast iron pillow block, the SY40TF incorporates SKF's proven self-aligning design, allowing the unit to compensate for minor shaft misalignment and mounting inaccuracies while maintaining smooth and efficient operation.

Features & Benefits

• Complete ready-to-mount pillow block bearing unit
• Designed for 40mm shaft diameters
• Robust cast iron housing construction
• SKF YAR 208-2F 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 fitted 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 208)
• Excellent resistance to contamination, vibration and shock loads

Technical Specifications

Bearing Unit Design

• Manufacturer: SKF
• Part Number: SY40TF
• Housing Type: Pillow Block Bearing Unit
• Housing Reference: SY 508 M
• Bearing Reference: YAR 208-2F
• 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): 40mm
• Inner Ring Shoulder Diameter (d1): 56.3mm
• Base Width (A): 46mm
• Top Width (A1): 29mm
• End Cover Projection (A5): 34mm
• Inner Ring Width (B): 49.2mm
• Distance to Thread Centre (B4): 7mm
• Centre Height (H): 54mm
• Foot Height (H1): 21mm
• Overall Height (H2): 106mm
• Bolt Hole Centres (J): 137mm
• Maximum Bolt Centre Distance (Jmax): 149mm
• Minimum Bolt Centre Distance (Jmin): 125mm
• Overall Length (L): 184mm
• Bolt Hole Diameter (N): 17mm
• Bolt Slot Length (N1): 27mm
• Raceway Centre Distance (s1): 30.2mm

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 208

Performance Data

• Basic Dynamic Load Rating (C): 30.7 kN
• Basic Static Load Rating (C₀): 19.0 kN
• Fatigue Load Limit (Pu): 0.8 kN
• Limiting Speed: 4,600 rpm
• Limiting Speed Based On: h6 Shaft Tolerance

Mounting Information

• Set Screw Size: M10 x 1
• Hex Key Size: 5mm
• Recommended Set Screw Tightening Torque: 15 Nm
• Recommended Attachment Bolt Diameter: 14mm (1/2")

Additional Data

• Number of Mounting Holes: 2
• Mounting Hole Type: Plain
• Unit Weight: Approximately 2.0kg
• eClass Code: 23-05-08-02
• UNSPSC Code: 31171536

Typical Applications

The SKF SY40TF pillow block bearing unit is widely used in conveyor systems, agricultural machinery, packaging equipment, food processing plants, material handling systems, manufacturing equipment, quarrying machinery, timber processing equipment, recycling machinery, and general industrial applications requiring dependable shaft support and straightforward maintenance.

Manufactured to SKF's renowned engineering standards, the SY40TF delivers high load carrying capability, effective sealing protection, easy installation, and long-term operational reliability, making it an excellent choice for demanding industrial environments where durability and performance are critical.