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Part Number

Part Number:
NSN:
NIIN:
Item Name:
SCREW , SHOULDER

Definition:

AN EXTERNALLY THREADED FASTENER WHOSE THREADED PORTION IS OF ONE NOMINAL DIAMETER, NO 0 (0.060 IN.) (1.5 MM) OR LARGER. IT HAS A ROUND UNTHREADED NECK OR SHANK ALL OR PART OF WHICH IS OF GREATER DIAMETER THAN THE THREADED PORTION. THE HEAD IS DESIGNED TO BE DRIVEN WITH EITHER A WRENCH OR AN INSERTED DRIVER OR BOTH IN SIZES BELOW NO. 10 (0.190 IN.) (5 MM) NOMINAL DIAMETER. NO. 10 (0.190 IN.) (5 MM) AND LARGER SIZES MUST BE DESIGNED FOR ANY TYPE OF INSERTED DRIVER, BUT MAY ALSO PROVIDE FOR EXTERNAL WRENCHING OF THE HEAD. A LOCKING FEATURE MAY BE INCORPORATED IN THE DESIGN OF THE HEAD OR THREADS. FOR ITEMS WHICH ARE BOTH SHOULDERED AND HAVE AN EXTERNALLY RELIEVED BODY, USE SCREW, EXTERNALLY RELIEVED BODY. FOR ITEMS WITH A NO. 10 (0.190 IN.) (5 MM) OR LARGER THREAD DIAMETER WITHOUT AN INSERTED DRIVER HEAD, USE BOLT, SHOULDER. EXCLUDES BOLT, INTERNAL WRENCHING AND SCREW, CAP, SOCKET HEAD.

CAGE Information

Code Company
81349 MILITARY SPECIFICATIONS PROMULGATED

Federal Supply Class

Title

SCREWS

Inclusions:

Exclusions:

Characteristics (Decoded)

MRC Requirements Statement Clear Text Reply
AASA THREAD LENGTH 0.418 INCHES MINIMUM AND 0.438 INCHES MAXIMUM
MDCL MATERIAL DOCUMENT AND CLASSIFICATION QQ-N-281,CL A FED SPEC SINGLE MATERIAL RESPONSE OVERALL
AATN SHOULDER DIAMETER 0.3085 INCHES MINIMUM FIRST SHOULDER AND 0.3105 INCHES MAXIMUM FIRST SHOULDER
CQBC MINIMUM TENSILE STRENGTH 80000 POUNDS PER SQUARE INCH
AAJD THREAD CLASS 3A
CWYB SHOULDER SHAPE ROUND FIRST SHOULDER
AHYM NOMINAL THREAD DIAMETER 0.250 INCHES
AAJF THREAD DIRECTION RIGHT-HAND
AASK HEAD STYLE FLAT CHAMFER
AATX SHOULDER LENGTH 0.567 INCHES MINIMUM FIRST SHOULDER AND 0.577 INCHES MAXIMUM FIRST SHOULDER
CQHQ MINIMUM YIELD STRENGTH 40000 POUNDS PER SQUARE INCH
THSD THREAD SERIES DESIGNATOR UNC
ABQZ INTERNAL DRIVE STYLE HEXAGON
AASL HEAD DIAMETER 0.419 INCHES MINIMUM AND 0.438 INCHES MAXIMUM
MATT MATERIAL NICKEL ALLOY 400 OVERALL
ASDB WIDTH ACROSS FLATS 0.156 INCHES NOMINAL
CMLP THREAD QUANTITY PER INCH 20
AASU HEAD HEIGHT 0.209 INCHES MINIMUM AND 0.219 INCHES MAXIMUM
AASB FASTENER LENGTH 1.000 INCHES NOMINAL

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