F4B 203-FMSquare flange ball bearing unit with narrow inner ring and eccentric locking collar, cast iron housing, North American standards

F4B 203-FMSquare flange ball bearing unit with narrow inner ring and eccentric locking collar, cast iron housing, North American standards

SKU: F4B 203-FMSquare flange ball bearing unit with narrow inner ring and eccentric locking collar, cast iron housing, North American standards

These square flanged ball bearing units are compliant with North American standards. They consist of an insert bearing, with a narrow inner ring and eccentric locking, intended primarily for use in applications where the direction of rotation is constant. The bearing is mounted in a cast iron housing, which can be bolted to a machine wall or frame. Ball bearing units can accommodate moderate initial misalignment, but normally do not permit axial displacement.

ID:117931

Technical Data
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Compliance with standard	North American standard
Purpose specific	For material handling applications
Material, housing	Cast iron
Sealing, bearing	Seal on both sides
Sealing type, bearing	Contact, standard
Sealing, unit	Optional end cover
Coating	Without

Dimensions

d	55.563 mm	Bore diameter
d₁	≈ 69.06 mm	Outer diameter of inner ring
d₂	74.5 mm	Outside diameter of locking ring
A	50 mm	Overall width
A₁	17.5 mm	Flange width
A₅	37.5 mm	Standout of end cover
B	32.6 mm	Width of inner ring
B₁	48.4 mm	Overall bearing width
B₄	7.9 mm	Distance from locking device side face to thread centre
D_b1	133.4 mm	Top external diameter
J	130.2 mm	Distance between attachment bolts
L	161.9 mm	Overall length
N	17.46 mm	Diameter of attachment bolt hole
s₁	35.9 mm	Distance from locking device side face to raceway centre
T	67.9 mm	Overall unit width

Threaded hole
R_G	1/8-27 NPT	Housing thread for grease fitting
R₁	35.5 mm	Axial position of the housing thread

Grease fitting
D_N	6.579 mm	Diameter of head sphere of grease fitting
SW_N	11.113 mm	Hexagonal key size for the grease fitting
G_N	1/8-27 NPT	Thread of grease fitting

Calculation data

Basic dynamic load rating	C	43.6 kN
Basic static load rating	C₀	29 kN
Fatigue load limit	P_u	1.25 kN
Limiting speed		3 600 r/min
		Limiting speed with shaft tolerance h6

Mass

Mass bearing unit

4.15 kg

Mounting information

Set screw	G₂	7/16-20 UNF
Hexagonal key size for set screw		5.556 mm
Recommended tightening torque for set screw		28.5 N·m
Recommended diameter for attachment bolts, mm	G	16 mm
Recommended diameter for attachment bolts, inch	G	0.625 in

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