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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
53711 NAVAL SEA SYSTEMS COMMAND

Federal Supply Class

Title

SCREWS

Inclusions:

Exclusions:

Characteristics (Decoded)

MRC Requirements Statement Clear Text Reply
AHYM NOMINAL THREAD DIAMETER 0.190 INCHES
CMLP THREAD QUANTITY PER INCH 24
ASDB WIDTH ACROSS FLATS 0.250 INCHES NOMINAL
AAJD THREAD CLASS 3A
CWYB SHOULDER SHAPE ROUND FIRST SHOULDER
AAJF THREAD DIRECTION RIGHT-HAND
AASK HEAD STYLE FLAT CHAMFER
AASL HEAD DIAMETER 0.357 INCHES MINIMUM AND 0.375 INCHES MAXIMUM
AATX SHOULDER LENGTH 0.750 INCHES NOMINAL FIRST SHOULDER
AASB FASTENER LENGTH 1.125 INCHES NOMINAL
THSD THREAD SERIES DESIGNATOR UNC
MATT MATERIAL NICKEL ALLOY K-500 OVERALL
AASU HEAD HEIGHT 0.177 INCHES MINIMUM AND 0.188 INCHES MAXIMUM
ABQZ INTERNAL DRIVE STYLE HEXAGON
MDCL MATERIAL DOCUMENT AND CLASSIFICATION QQ-N-286 CL A FED SPEC SINGLE MATERIAL RESPONSE OVERALL
AATN SHOULDER DIAMETER 0.250 INCHES NOMINAL FIRST SHOULDER
AASA THREAD LENGTH 0.250 INCHES NOMINAL

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