Pillow Block Bearing Unit – 1-3/4″ Bore, 2-Bolt Cast Iron, Set Screw (SY 1.3/4 TF)

The SKF SY 112 is a two-bolt pillow block ball bearing unit built for a 1-3/4″ (44.45 mm) diameter shaft. It pairs a rugged grey cast-iron housing with a pre-lubricated, sealed insert ball bearing (SKF insert number 479209-112, marked “RASC 209-112” on the original box). The insert’s extended inner ring is locked to the shaft with two set screws for quick, reliable mounting, and its self-aligning spherical outer ring compensates for initial shaft misalignment.

This is genuine SKF stock manufactured by SKF Industries in the USA. In SKF’s current catalog the direct equivalent is SY 1.3/4 TF, which uses the YAR 209-112-2F set-screw insert, so this unit interchanges dimensionally with modern 209-series, 1-3/4″ two-bolt pillow blocks. A grease fitting in the housing allows relubrication in service. Typical applications include conveyors, fans and blowers, agricultural equipment, and general industrial line-shaft and drive support.

Specifications

• Brand: SKF (SKF Industries, USA)
• Designation: SY 112 (current SKF equivalent: SY 1.3/4 TF)
• Type: Two-bolt pillow block unit, mounted ball bearing
• Bore / shaft size: 1-3/4 in (44.45 mm)
• Insert bearing: 479209-112 (equivalent YAR 209-112-2F) — OD 85 mm, width 49.2 mm
• Locking: Two set screws on extended inner ring (5/16-24 UNF)
• Seals: Contact seals, both sides
• Housing material: Grey cast iron
• Mounting: Foot / base mount, 2 bolt holes — bolt-hole center distance 143.5 mm (≈5-21/32 in), base-to-center height 54 mm (≈2-1/8 in), mounting bolt 1/2 in (12.7 mm)
• Lubrication: Grease fitting, relubricatable
• Basic dynamic load rating (C): 33.2 kN (≈7,460 lbf)
• Basic static load rating (C₀): 21.6 kN (≈4,860 lbf)
• Weight: ≈5.1 lb (2.3 kg)
• Country of origin: USA
• Condition: New, open box