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vertical resonant frequency of 25 Hz or lower. A minimum clearance
of 0.050 inches should be allowed around the entire perimeter of the
drive to allow for cooling airflow and motion during mechanical shock
or vibration.
I
1.7.2.1 ST251
There will be no more than forty-two (42) defects total per drive.
FIGURE
3:
Drive Mounting
Dimensions
800
max
(2032)
-.-
I
1 682 ±01O
(42.72 ± 25)
i
!
T
, 031
±
.025
(0.78
±
.63)
I
~I
'.63
max
(414)
(
\.
a
(
1.7.2.2 ST251 R
There will be no more than forty-three (43) defects total per drive.
1.7.2.3 ST277R
There will be no more than sixty-five (65) defects total per drive.
-
--l1.B7
+.03
I
(47.50±.76r
195 ±01O'
I
(495 ± 251 -'
1- -
I
__
I
!
-
I
1.8.1 AMBIENT TEMPERATURE
100e
to 45°e (500F to 113°F)
-400e to
600
(-400F to 1400F)
Operati ng:
Nonoperati ng:
1.8 ENVIRONMENTAL
SPECIFICATIONS
1.8.1.2 ST251 R/277R
1.8.1.1 ST251
(
(
r
5.77 max.
(146.6)
, MOL;I\TII\G
)
1I(.)LES.·~4 on hot-:
tom.
4
on each sIde
o-12LJ'\IC-2B
(12X)
I
/
3.12 ± .03
_
I
(79.25 ± .76)
l
I
I
10
o
I
'5.50 ± .03
(139.7 ±.76j
!
I
I
t
I
5875
1:. 010
(149.22 ± 25)
!
I
I
1.8.2 TEMPERATURE
GRADIENT
NOTE: The mounting screws must not extend
inside the mounting leet more than 0.125 inch,
measured lrom the outside surface 01 the loot.
Outside Surface
I
Mounting Foot
(
~
,
¢
(
Operating:
Nonoperating:
Operati ng:
Nonoperati ng:
150e
to
450e
(59°F to 113°F)
-400e
to 60° HOoF to 140°F)
100e/hr. (18°F/hr.) max.
Below condensation
1-12
ST251
/251
R/277R Product
Manual,
Rev.A
ST251
/251
R/277R Product
Manual,
Rev.A
1-5
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