SKFSY-112Pillow Block Ball Bearing Unit, 1-3/4 in Shaft, Setscrew Lock

Product Description

What this part is:

SKF SY112 two-bolt pillow block ball bearing unit, current designation SY 1.3/4 TF, with a 1-3/4 in (44.450 mm) bore. Grey cast iron housing with a ball insert bearing locked to the shaft by setscrews. Unit Quantity: 1 Pc, one complete pillow block with housing, insert bearing, seals and setscrews.

Decoding the designation:

SY — SKF’s pillow block ball bearing unit family.

1.3/4 — shaft size in inches.

TF — grey cast iron housing.

SY-112, SY112, SY 1.3/4 TF and SY1.3/4TF — written forms of the same designation.

Specifications:

Bore Diameter: 1.7500 in (44.450 mm). Housing Style: Two-bolt pillow block, grey cast iron. Locking Method: Setscrew, 5/16-24 UNF. Number Of Rows: 1. Rolling Elements: Ball. Bore Type: Cylindrical. Lubricant: Grease. Series: SY. Base Number: SY 1.3/4 TF. Dynamic Load Rating: 33,200 N. Static Load Rating: 21,600 N. Limiting Speed: 4,300 rpm on a shaft ground to h6.

Dimensions and mounting:

Attachment bolt distance: 143.5 mm nominal, adjustable from 135 mm to 152 mm along the slots. Bolt hole diameter: 14 mm, slot length 22.5 mm. Recommended attachment bolt: 12 mm, or 0.5 in. Shaft centre height above the mounting face: 54 mm. Foot height: 21 mm. Overall height: 107 mm. Overall length: 187 mm. Base width: 48 mm. Inner ring width: 49.2 mm. Distance from the locking device side face to the raceway centre: 30.2 mm. Dowel pin distance: 173 mm, offset 17 mm axially, 4 mm recommended pin diameter. Set screw thread: 5/16-24 UNF with a 3.969 mm hexagon key. Grease fitting thread: 1/4-28 UNF SAE-LT, positioned 45° around the housing.

Compatibility and replacement:

Cross-Reference 1: SKF SY 1.3/4 TF, the current SKF designation for this same unit. Cross-Reference 2: SKF YAR 209-112, the self-aligning insert bearing fitted inside this housing. Pillow blocks interchange on shaft size, shaft centre height and bolt spacing: 1-3/4 in, 54 mm and 143.5 mm for this unit.

Frequently asked questions:

What shaft size does the SKF SY112 fit?

The bore is 1.7500 in (44.450 mm), cylindrical, and the unit locks to the shaft with setscrews.

What is the bolt spacing and centre height?

Bolt distance is 143.5 mm nominal, adjustable from 135 mm to 152 mm in 22.5 mm slots with 14 mm holes. Shaft centre height is 54 mm.

What are the load ratings and speed limit?

Dynamic load rating is 33,200 N and static load rating is 21,600 N. Limiting speed is 4,300 rpm on a shaft ground to h6.