Part Number
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 |
|---|---|
| 18876 | U S ARMY AVIATION AND MISSILE COMMAN |
Federal Supply Class
Title
SCREWS
Inclusions:
Exclusions:
Characteristics (Decoded)
| MRC | Requirements Statement | Clear Text Reply |
|---|---|---|
| AATN | SHOULDER DIAMETER | 0.371 INCHES MINIMUM FIRST SHOULDER AND 0.373 INCHES MAXIMUM FIRST SHOULDER |
| MATT | MATERIAL | STEEL CORROSION RESISTING OVERALL |
| CQBC | MINIMUM TENSILE STRENGTH | 160000 POUNDS PER SQUARE INCH |
| CMLP | THREAD QUANTITY PER INCH | 18 |
| AAJD | THREAD CLASS | 3A |
| CWYB | SHOULDER SHAPE | ROUND FIRST SHOULDER |
| AAJF | THREAD DIRECTION | RIGHT-HAND |
| AASK | HEAD STYLE | FLAT CHAMFER |
| CQFM | HARDNESS RATING | 36.0 ROCKWELL C MINIMUM OVERALL AND 40.0 ROCKWELL C MAXIMUM OVERALL |
| AASU | HEAD HEIGHT | 0.244 INCHES MINIMUM AND 0.250 INCHES MAXIMUM |
| AASA | THREAD LENGTH | 0.500 INCHES MINIMUM |
| THSD | THREAD SERIES DESIGNATOR | UNC |
| AASL | HEAD DIAMETER | 0.543 INCHES MINIMUM AND 0.552 INCHES MAXIMUM |
| ABQZ | INTERNAL DRIVE STYLE | HEXAGON |
| AATX | SHOULDER LENGTH | 0.995 INCHES MINIMUM FIRST SHOULDER AND 1.005 INCHES MAXIMUM FIRST SHOULDER |
| AASB | FASTENER LENGTH | 1.495 INCHES MINIMUM AND 1.505 INCHES MAXIMUM |
| AHYM | NOMINAL THREAD DIAMETER | 0.312 INCHES |
| SFTT | SURFACE TREATMENT | PASSIVATE OVERALL |