outline dimension (mm)

d	280
D	380
T	80
T3	85
T4	94
γ (min)	2.1

specified load (N)

Ca	450000
C0a	1950000

Rated load load {kgf}

Ca	46000
C0a	199000

Rated speed min ^-1

Fat lubrication	530
oiling	800

bearing symbol

Flat base is ring type	51256X
Heart ball seat	53256X
Serical seat circle	53256XU

size (mm)

d1	375
D1	284
D2	325
D3	390
b	31
A	143
R	280

installation size (mm)

da （min）	339
da (max)	321
γa (max)	2

Weight (kg) (reference)

Flat base is ring type	27.1
Heart ball face type	30.3
Serical seat circle	37