FYH F305 Square 4-Bolt Flange Bearing Housing, 25 mm (1 in) Shaft

The FYH F300 is a cast iron square 4-bolt flange bearing housing in the heavy duty range. This page covers 19 housings, F305 to F328, for shafts from 25 to 140 mm (inch shaft sizes 1 to 4 in are also covered). Select the housing from the drop-down; each size has its own dimension set in the Model Details.

These 4-bolt flange housings are supplied without an insert bearing. A complete unit such as UCF314 is the F314 housing fitted with a UC314 insert bearing, which is ordered separately (see Related products). This page mixes metric and inch shaft sizes, because the matching inserts come in both bore types: the Shaft Diameter option gives the metric size first and the inch sizes in brackets.

Where this product is used

• Machine frames and walls with a flat mounting face
• Conveyors and drives
• Fans and blowers
• General industrial machinery

Features

• Square four-bolt flange housing (catalogue code F)
• Cast iron housing, 300 series (diameter series code 3, heavy duty)
• Insert bearings listed for these housings: UC (set screw) in all sizes; UK (tapered bore, adapter sleeve) in 18 of 19 sizes
• Dimensions for every size in mm with the catalogue inch values, taken from the unit tables

Key specifications

Available sizes

Dimensions in mm. Letters follow the catalogue dimension drawings; the full set of dimensions, with inch values, is in each size's Model Details.

Selecting the right option

Match the housing to the insert bearing and the shaft. The catalogue unit tables pair each housing number with specific insert bearings; for example F314 takes UC314 on a 70 mm shaft.

The page lists metric and inch shaft sizes together. Choose the metric size for a metric shaft; for an inch shaft pick the same housing and order the insert with the matching dash number (for example UC314-44). Sizes without an inch bore in the unit tables: F306, F307, F310, F316, F317, F322, F324, F326, F328.

The Bolt Size option is the mounting bolt for the housing, as listed in the catalogue unit tables (inch equivalent in the Model Details).

The catalogue also lists F319 and F321, which are not part of this page. Contact us if you need them.

Not sure which insert or housing suits your shaft? Send us the shaft diameter and mounting details and we will confirm the match.

Fitting and use

The housing is supplied without an insert bearing. Order the insert separately and lock it to the shaft in the way its own type requires: a UC insert locks to the shaft with two set screws; a UK insert is a tapered bore insert that mounts on the shaft with an adapter sleeve.

Mount the flange against a flat, rigid face and use the bolt size and bolt hole spacing J shown for the size. Dimension letters follow the catalogue drawings; J is the bolt hole spacing and N the bolt hole diameter.

Related products

Insert bearings that fit these housings, from the catalogue unit tables: UC300 metric set screw insert bearings, UC300 inch set screw insert bearings and UK300 tapered bore insert bearings. Related FYH housings: F200 square 4-bolt flange housings, FX square 4-bolt flange housings and FL300 oval 2-bolt flange housings.