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Date: Sat, 30 Dec 2006 03:21:50 -0500
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From: "Rod Pharis" <rpharis@teamimc.com>
Subject: TSIO-550 turbo bolts
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Rick,

MS90726 is a Military Specification for fine thread hex head screws, and
the -33 size is a cad plated 5/16-24 X .875 long, Grade 5 steel, hex head
cap screw (MS90725 covers the course thread series).  This spec is now
obsolete and have been replaced by an ASME spec, however it is still
available under the MS90726 spec, and under several other specs.  Any
industrial screw distributor can supply the screw in question, with or
without certification.  If you purchase them from a retail hardware store,
make sure they are made by a US manufacturer, and are marked Grade 5 (or
Grade 8).  Do not accept Grade 2 or an import, especially if it is marked
Grade 8.  Imported high hardness screws are frequently subject to hydrogen
embrittlement due to improper post hardening heat treatment.  For this
reason, such foreign sources have been classified as unqualified suppliers
by many US aerospace OEM customers.

Rod Pharis
Legacy N96RT (res), 40% and counting

-----Original Message-----
From: Lancair Mailing List [mailto:lml@lancaironline.net]On Behalf Of
rtitsworth
Sent: Friday, December 29, 2006 3:10 PM
To: lml
Subject: [LML] TSIO-550 turbo bolts


On a TSIO-550 the turbocharger brackets connect to the case with
"MS90726-33" bolts (according to the TCM parts manual).  Does anyone know
what a MS90726 bolt is?  Is it the same as an "AN" bolt?  What size is a
MS90726-33??

Rick T
Cell 313-506-5604


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