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0.747 ± 0.007 (18.97 ± 0.18)
4X 3 mm × 0.5 mm
× 0.15 in. (3.81 mm) deep
min. full thread
(2 each side)
1.375 ± 0.015
(34.93 ± 0.38)
0.118 ± 0.010
(3.00 ± 0.25)
4.020 (102.11) max
(head/disc assembly
to tip of pins)
1.500 ± 0.010
(38.10 ± 0.25)
0.000
1.227 ± 0.020
(31.17 ± 0.51)
0.155 ± 0.020
(3.94 ± 0.51)
0.239 ± 0.035
(6.07 ± 0.89)
0.000
0.000
2.760 (70.10) max
2.430 ± 0.010
(61.72 ± 0.25)
0.157 ± 0.015
(3.99 ± 0.38)
Pin 1
0.079 (2.00)
Pin 20 removed
for keying
0.152 ± 0.005
(3.86 ± 0.13)
0.079 (2.00)
1.659 (42.14)
Dimensions are in inches (mm)
4X 3 mm × 0.5 mm
× 0.15 in. (3.81 mm) deep
min. full thread
4.010 (101.85) max.
(head/disc assembly)
Figure 3. Mounting dimensions for the ST9816AG
18 Marathon 810 (ST9816AG) Product Manual, August 1995