Sun Enterprise 10000 Server
 

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1) All procedures for component replacement should be followed. This includes any
patterns specified for tightening screws.
2) If an adjustable torque wrench is available, the build spec should be used.
From an engineering standpoint, it is important that the screws be tightened
with some confidence to the actual torque, and that the final torque be
consistent.  It is recommended that the service technicians have an
adjustable torque driver, not a fixed tool. All the tolerances for the
system are specified to be within the accuracy of a reasonably high-quality
adjustable tools (+/- .5 in-lb up to 10 in-lb), and is what we have been using in the
lab throughout development. It should be noted that the steel-to-steel spec for
an M5 screw (centerplane) is __33.3__ in/lbs.
**However, a preset tool can be used provided the service engineer
adheres to the caveats below .**
3) These specs will be included in the next rev of the manual; engineering will be
updating there drawings per the changes noted below. Manufacturing should start
using these new specs after the release of the new drawings.
4) This took a lot of time to compile - please read it completely.
			______________	_______________	  ______________  ____________________
			Orig. BSD Spec	Sun Spec	  Adj. BSD Spec	  Use of 6.0 in/lbs OK
			for Mfg. Build			  for Mfg. Build  In the Field
			______________	_______________	  ______________  ____________________
Guidelines:
torque range
relative to spec	+/-0.06 Nm	Per screw type,	  +/-0.06 Nm	  N/A
unless range stated	+/-0.5 in/lbs	see below	  +/-0.5 in/lbs(Note 6)
			
Captive compression
connections, #4-40 hex
(See note 1)
low torque		0.34 Nm		Not Spec'd	  0.34 Nm	  No, tighten less 	
			3.0 in/lbs	Not Spec'd	  3.0 in/lbs	  than 6.0 in/lbs
final torque	0.68 Nm		.58 - .73 Nm	  0.68 Nm(note 4) Yes
			6.0 in/lbs	5.2 - 6.5 in/lbs  6.0 in/lbs			
	
Discrete M3 		0.8 Nm		.798 - .998 Nm	  0.8 Nm(note 4)  Yes
			7.0 in/lbs	7.0 - 8.8 in/lbs  7.0 in/lbs
Discrete M5		3.76 Nm		3.76 - 4.70 Nm	  3.76 Nm	  Yes (See note 3)
			33.3 in/lbs	33.3-41.6 in/lbs  33.3 in/lbs						
				
			______________	_______________	  ______________  ____________________
			Orig. BSD Spec	Sun Spec	  Adj. BSD Spec	  Use of 6.0 in/lbs OK
			for Mfg. Build			  for Mfg. Build  In the Field
			______________	_______________	  ______________  ____________________
Specific components:
	
Crkt Brkr, M3 	0.6 Nm		.798 - .998 Nm	  0.6 Nm(note 5)  Yes
			5 in/lbs	7.0 - 8.8 in/lbs  5 in/lbs
	
Sys. board cover, M3	1.0 Nm		.798 - .998 Nm	  .798 - .998 Nm  Yes
			8.9 in/lbs	7.0 - 8.8 in/lb	  7.0 - 8.8 in/lb
I/O, Processor,
and Memory module
#4-40 hex
captive,low torque	0.34 Nm 	Not Spec'd	  0.34 Nm	  No, tighten less
	  		3.0 in/lbs	Not Spec'd	  3.0 in/lbs	  than 6.0 in/lbs
	
captive,final torque	0.68 Nm 	.58 - .73 Nm	  0.68 Nm(note 4) Yes
	  		6.0 in/lbs	5.2 - 6.5 in/lbs  6.0 in/lbs
	
I/O, Memory module, M3
discrete screw 	0.8 Nm 		.798 - .998 Nm	  0.8 Nm(note 7)  Yes
	  		7.0 in/lbs	7.0 - 8.8 in/lb	  7.0 in/lbs
	
Fan centerplane
torque, M3		0.6 Nm		.798 - .998 Nm	  0.6 Nm (Note 2) Yes
			5.3 in/lbs	7.0 - 8.8 in/lbs  5.3 in/lbs
	
Centerplane torque,
M5			3.76 Nm		3.76 - 4.70 Nm	  3.76 Nm	  Yes (See note 3)
			33.3 in/lbs	33.3-41.6 in/lbs  33.3 in/lbs				
				
Note 1: Manual erroneously indicates #2-56, this will be corrected
	in the next rev.
Note 2: This is lower than the Sun spec because the screwhead will
	be pressed against a circuit board.
Note 3: The 6.0 in/lbs preset tool can be used provided a specific
	pattern is followed (TBD).
Note 4: Mechanical failures have been observed due to over-torquing
	attached hardware.
Note 5: Attachment hardware is a thin piece of metal, higher torque
	is not recommended.
Note 6: BSD will keep original range, but will state that if a range
	is given it override this spec.
Note 7: In this application a higher spec is not recommended due to
	the opposing hardware.
Sun Torque Spec Ranges:
Screw	   in/lbs	    Nm
	Min	Max	Min	Max
4-40	5.2	6.5	.58	.73
M3	7.0	8.8	.798	.998
M5	33.3	41.6	3.76	4.70

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