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Part Number:
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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
80205 NATIONAL AEROSPACE STANDARDS COMMITT

Characteristics (Decoded)

MRC Requirements Statement Clear Text Reply
CSYM SURFACE FINISH 32.0 MICROINCHES THREADS
MATT MATERIAL STEEL COMP 4140 OVERALL OR STEEL COMP E4340 OVERALL OR STEEL COMP 8740 OVERALL
CSYM SURFACE FINISH 32.0 MICROINCHES GRIP
AASU HEAD HEIGHT 0.088 INCHES MINIMUM AND 0.102 INCHES MAXIMUM
THSD THREAD SERIES DESIGNATOR UNJC
CSYM SURFACE FINISH 32.0 MICROINCHES BEARING SURFACE OF HEAD
STDC SURFACE TREATMENT DOCUMENT AND CLASSIFICATION QQ-P-416,TY 2 CL 2 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
CQBC MINIMUM TENSILE STRENGTH 160000 POUNDS PER SQUARE INCH
AAJD THREAD CLASS 3A
AASA THREAD LENGTH 0.251 INCHES MINIMUM AND 0.301 INCHES MAXIMUM
AAJF THREAD DIRECTION RIGHT-HAND
AHYM NOMINAL THREAD DIAMETER 0.164 INCHES
CQFM HARDNESS RATING 36.0 ROCKWELL C MINIMUM OVERALL AND 40.0 ROCKWELL C MAXIMUM OVERALL
AAUR GRIP DIAMETER 0.1625 INCHES MINIMUM AND 0.1635 INCHES MAXIMUM
ZZZK SPECIFICATION/STANDARD DATA 80205-NAS1142 PROFESSIONAL/INDUSTRIAL ASSOCIATION STANDARD
SFTT SURFACE TREATMENT CADMIUM OVERALL AND CHROMATE OVERALL
AASL HEAD DIAMETER 0.309 INCHES MINIMUM AND 0.331 INCHES MAXIMUM
ANEE GRIP LENGTH 0.115 INCHES MINIMUM AND 0.135 INCHES MAXIMUM
ABQZ INTERNAL DRIVE STYLE OFFSET CRUCIFORM (TORQUE SET)
CMLP THREAD QUANTITY PER INCH 32
AASB FASTENER LENGTH 0.388 INCHES MINIMUM AND 0.418 INCHES MAXIMUM
AASK HEAD STYLE PAN

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