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HMMWV oil cooler screws

Mogman

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Just want to confirm before driving 100 miles round trip to the specialty tool store that the allen head screws for the oil/trans/steering cooler is 3/16.
 
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Mogman

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I looked up the bolts and they are SUPPOSED to be 5/16-18 (MS16995-72) witch would make one ASSUME they were USS but nothing fractional fits 3/16 too small 7/32 too large, 5MM about right but anyone that puts such a small drive on a 5/16 bolt is a total moron, I am just going to drill the dang things out as I am replacing the radiator anyway, but now I will have to wait on bolts cuz cap head screws are hard to find around here and these are really stuck..
 

Guyfang

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This help any?

THREAD CLASS3A
THREAD DIRECTIONRIGHT-HAND
THREAD LENGTH1 1/8 INCHES MAXIMUM
FASTENER Length2 1/2 INCHES MAXIMUM
HEAD STYLEFLAT CHAMFER
HEAD DIAMETER0 457/1000 INCHES MINIMUM AND 469/1000 INCHES MAXIMUM
HEAD HEIGHT0 153/500 INCHES MINIMUM AND 313/1000 INCHES MAXIMUM
INTERNAL DRIVE STYLEHEXAGON
NOMINAL THREAD DIAMETER0 39/125 INCHES
WIDTH ACROSS FLATS0 1/4 INCHES MINIMUM AND 253/1000 INCHES MAXIMUM
THREAD QUANTITY PER INCH18
MINIMUM TENSILE STRENGTH80000 POUNDS PER SQUARE INCH
HARDNESS RATING80 ROCKWELL B MINIMUM OVERALL
MINIMUM YIELD STRENGTH30000 POUNDS PER SQUARE INCH
MATERIALSTEEL COMP 304 OVERALL
MATERIAL DOCUMENT AND CLASSIFICATIONQQ-S-763 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
SURFACE TREATMENTPASSIVATE OVERALL
TEST DATA DOCUMENT81348-FFS86 SPECIFICATION (INCLUDES ENGINEERING TYPE BULLETINS, BROCHURES,ETC., THAT REFLECT SPECIFICATION TYPE DATA IN SPECIFICATION FORMAT; EXCLUDES COMMERCIAL CATALOGS, INDUSTRY DIRECTORIES, AND SIMILAR TRADE PUBLICATIONS, REFLECTING GENERAL TYPE DATA ON CERTAIN ENVIRONMENTAL AND PERFORMANCE REQUIREMENTS AND TEST CONDITIONS THAT ARE SHOWN AS "TYPICAL", "AVERAGE", "NOMINAL", ETC.). OR 96906-MS16995-72 STANDARD (INCLUDES INDUSTRY OR ASSOCIATION STANDARDS, INDIVIDUAL MANUFACTUREER STANDARDS, ETC.).
THREAD SERIES DESIGNATORUNC
NONDEFINITIVE SPEC/STD DATA6 TYPE
 

Mogman

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Not really, I found all that info it says nothing about the drive size, the fact is the drive head is too small and shallow for a 5/16-18 fastener, never had them this bad stuck before ether, and they are pretty soft so the heads strip out easy, should be easy to drill though, GRR
 

Mogman

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Well as it turned out the side I started out had already been boogered up by a previous genius so I ended up drilling them, the other side was different they came out but they were pretty darn corroded, the entire stack is a disappointment, looks like AMG farmed that out to a third grade class somewhere.
 

Retiredwarhorses

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The socket cap bolts for the oil cooler are 5/16…you don’t need the button heads you see on some, you can use a standard 5/16 socket head “Hex” socket from any hardware store.
 
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