Seagate ST9550AG, ST9655AG manual Mounting dimensions for the ST9655 family drives

ST9655 Family Installation Guide, Rev. A										5
			Dimensions are in inches (mm)
		0.747 ± 0.007 (18.97 ± 0.18)
					4.010 (101.85) max.
					(head/disc assembly)					0.118 ± 0.010
										(3.00 ± 0.25)
								0.000
									0.152 ± 0.005
	4X 3 mm × 0.5 mm
	× 0.15 in. (3.81 mm) deep							(3.86 ± 0.13)
	min. full thread			1.227 ± 0.020
	(2 each side)
				(31.17 ± 0.51)
					4.020 (102.11) max
					(head/disc assembly
					to tip of pins)
		1.500 ± 0.010				0.000	1.375 ± 0.015
		(38.10 ± 0.25)					(34.93 ± 0.38)			0.155 ± 0.020
										(3.94 ± 0.51)

0.000

0.079 (2.00)

Pin 20 removed for keying

0.239 ± 0.035

(6.07 ± 0.89)

2.760 (70.10) max

2.430 ± 0.010 (61.72 ± 0.25)

4X 3 mm × 0.5 mm

×0.15 in. (3.81 mm) deep min. full thread

Pin 1

0.157 ± 0.015 (3.99 ± 0.38)

0.079 (2.00)

1.659 (42.14)

Figure 2. Mounting dimensions for the ST9655 family drives