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Part Number

Part Number:
NSN:
NIIN:
Item Name:
SCREW , CLOSE TOLERANCE

Definition:

A SCREW, MACHINE OR SCREW, CAP, SOCKET HEAD WHOSE UNTHREADED PORTION IS OF SPECIFIED GRIP LENGTH, PLATED OR UNPLATED, AND IS MACHINED TO A TOLERANCE OF ONE THOUSANDTH (0.001 IN.) (0.025 MM) OR LESS OF A SPECIFIC DIAMETER FOR ITEMS (1.000 IN.) (25 MM) OR LESS IN DIAMETER. ITEMS OVER (1.000 IN.) (25 MM) IN DIAMETER SHALL HAVE A TOLERANCE OF FIFTEEN TEN THOUSANDTHS (0.0015 IN.) (0.038 MM) OR LESS. THE NOMINAL MAJOR DIAMETER OF THE THREADS SHALL BE AT LEAST ONE THOUSANDTH (0.001 IN.) (0.025 MM) BELOW THE MINIMUM SHANK DIAMETER, BUT NOT BELOW THE MINIMUM MAJOR DIAMETER FOR APPLICABLE CLASS OF FIT, AS SHOWN IN THE SCREW THREAD STANDARDS, FED STD H28 AND/OR OTHER NATIONALLY RECOGNIZED STANDARDS. THE HEAD IS DESIGNED TO BE HELD OR DRIVEN WITH AN INSERTED DRIVER. IT IS NOT DESIGNED FOR ROTATION BY THE THUMB AND FINGERS. A LOCKING FEATURE MAY BE INCORPORATED IN THE DESIGN OF THE HEAD OR THREADS.

CAGE Information

Code Company
98897 LOCKHEED MARTIN CORPORATION DBA LOCK

Federal Supply Class

Title

SCREWS

Inclusions:

Exclusions:

Characteristics (Decoded)

MRC Requirements Statement Clear Text Reply
CSYM SURFACE FINISH 32.0 MICROINCHES THREADS
CSYM SURFACE FINISH 32.0 MICROINCHES GRIP
AASL HEAD DIAMETER 0.449 INCHES MINIMUM AND 0.507 INCHES MAXIMUM
AASB FASTENER LENGTH 1.926 INCHES MINIMUM AND 1.956 INCHES MAXIMUM
THSD THREAD SERIES DESIGNATOR UNJF
AASA THREAD LENGTH 0.291 INCHES MINIMUM AND 0.341 INCHES MAXIMUM
CQBC MINIMUM TENSILE STRENGTH 160000 POUNDS PER SQUARE INCH
AAJD THREAD CLASS 3A
ANEE GRIP LENGTH 1.615 INCHES MINIMUM AND 1.635 INCHES MAXIMUM
AHYM NOMINAL THREAD DIAMETER 0.250 INCHES
CMLP THREAD QUANTITY PER INCH 28
ABQZ INTERNAL DRIVE STYLE CROSS RECESS TYPE 1
AAJF THREAD DIRECTION RIGHT-HAND
AASK HEAD STYLE FLAT COUNTERSUNK
CRSQ COUNTERSINK ANGLE 99.0 DEGREES MINIMUM AND 101.0 DEGREES MAXIMUM
AAUR GRIP DIAMETER 0.2485 INCHES MINIMUM AND 0.2495 INCHES MAXIMUM
MDCL MATERIAL DOCUMENT AND CLASSIFICATION NAS621,COMP 6AL-4V ASSN STD SINGLE MATERIAL RESPONSE OVERALL
MATT MATERIAL TITANIUM ALLOY UNS R54520 OVERALL

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