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Part Number:
NSN:
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Item Name:
BOLT , CLOSE TOLERANCE

Definition:

AN EXTERNALLY THREADED FASTENER WHOSE UNTHREADED PORTION IS OF A SPECIFIED GRIP LENGTH, PLATED OR UNPLATED, AND IS MACHINED TO A TOLERANCE OF ONE THOUSANDTH (0.001) OF AN INCH (0.025 MM) OR LESS OF A SPECIFIC DIAMETER FOR ITEMS ONE INCH (25 MM) OR LESS IN DIAMETER. ITEMS OVER ONE INCH (25 MM) IN DIAMETER SHALL HAVE A TOLERANCE OF FIFTEEN TEN-THOUSANDTHS (0.0015) OF AN INCH (0.038 MM) OR LESS. THE NOMINAL MAJOR DIAMETER OF THE THREADS SHALL BE AT LEAST ONE THOUSANDTH (0.001) OF AN INCH (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 NOT DESIGNED TO BE HELD OR DRIVEN WITH AN INSERTED DRIVER, NOR IS IT DESIGNED FOR ROTATION BY THE THUMB AND FINGERS. A LOCKING FEATURE MAY BE INCORPORATED IN THE DESIGN OF THE HEAD OR THREADS. FOR ITEMS HAVING CLOSE TOLERANCE, AND FABRICATED FROM MATERIAL HAVING 160,000 POUNDS PER SQUARE INCH (1100 MEGAPASCALS) MINIMUM TENSILE STRENGTH, SEE BOLT, SHEAR. FOR ITEMS FABRICATED FROM MATERIAL HAVING LESS THAN 160,000 POUNDS PER SQUARE INCH (1100 MEGAPASCALS) MINIMUM TENSILE STRENGTH AND NOT HAVING A CLOSE TOLERANCE, SEE BOLT, MACHINE.

CAGE Information

Code Company
17446 HUCK INTERNATIONAL INC. DBA ALCOA FA

Federal Supply Class

Title

BOLTS

Inclusions:

Exclusions:

Characteristics (Decoded)

MRC Requirements Statement Clear Text Reply
AATD EXTENDED WASHER THICKNESS 0.059 INCHES MINIMUM AND 0.079 INCHES MAXIMUM
AATD EXTENDED WASHER THICKNESS 0.059 INCHES MINIMUM AND 0.079 INCHES MAXIMUM
MATT MATERIAL STEEL CORROSION RESISTING OVERALL
AATC EXTENDED WASHER DIAMETER 0.428 INCHES MINIMUM AND 0.438 INCHES MAXIMUM
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
AAJF THREAD DIRECTION RIGHT-HAND
AASA THREAD LENGTH 0.443 INCHES MINIMUM AND 0.493 INCHES MAXIMUM
AASU HEAD HEIGHT 0.290 INCHES MINIMUM AND 0.310 INCHES MAXIMUM
THSD THREAD SERIES DESIGNATOR UNF
AATB WIDTH BETWEEN FLATS 0.304 INCHES MINIMUM AND 0.313 INCHES MAXIMUM
AAUR GRIP DIAMETER 0.2490 INCHES MINIMUM AND 0.2495 INCHES MAXIMUM
AASB FASTENER LENGTH 2.078 INCHES MINIMUM AND 2.108 INCHES MAXIMUM
SFTT SURFACE TREATMENT PASSIVATE OVERALL
AASK HEAD STYLE DOUBLE HEXAGON W/HOLE

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