Part Number
Part Number:
NSN:
NIIN:
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 |
| CSYM |
SURFACE FINISH |
125.0 MICROINCHES GRIP |
| THSD |
THREAD SERIES DESIGNATOR |
UNJF |
| CSYM |
SURFACE FINISH |
32.0 MICROINCHES BEARING SURFACE OF HEAD |
| CBBL |
FEATURES PROVIDED |
FINISHED HEAD |
| AAJD |
THREAD CLASS |
3A |
| ABQZ |
INTERNAL DRIVE STYLE |
TRI-WING RECESS |
| SUPP |
SUPPLEMENTARY FEATURES |
TRI-WING RECESS NO. NAS4000-6 |
| AHYM |
NOMINAL THREAD DIAMETER |
0.250 INCHES |
| AASL |
HEAD DIAMETER |
0.456 INCHES MINIMUM AND 0.508 INCHES MAXIMUM |
| CMLP |
THREAD QUANTITY PER INCH |
28 |
| AAUR |
GRIP DIAMETER |
0.249 INCHES MINIMUM AND 0.250 INCHES MAXIMUM |
| AAJF |
THREAD DIRECTION |
RIGHT-HAND |
| AASK |
HEAD STYLE |
FLAT COUNTERSUNK |
| MATT |
MATERIAL |
IRON ALLOY 660 OVERALL |
| CRSQ |
COUNTERSINK ANGLE |
99.0 DEGREES MINIMUM AND 101.0 DEGREES MAXIMUM |
| AASB |
FASTENER LENGTH |
1.598 INCHES MINIMUM AND 1.628 INCHES MAXIMUM |
| ZZZK |
SPECIFICATION/STANDARD DATA |
80205-NAS4003 PROFESSIONAL/INDUSTRIAL ASSOCIATION STANDARD AND 80205-NAS4204/CANCELED/ PROFESSIONAL/INDUSTRIAL ASSOCIATION STANDARD |
| CSYM |
SURFACE FINISH |
125.0 MICROINCHES TOP OF HEAD |
| AASA |
THREAD LENGTH |
0.425 INCHES NOMINAL |
| ANEE |
GRIP LENGTH |
1.178 INCHES MINIMUM AND 1.198 INCHES MAXIMUM |
| STDC |
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION |
QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL |
| ZZZT |
NONDEFINITIVE SPEC/STD DATA |
A TYPE AND 1 CLASS AND 3 TABLE AND 0.250-28 SIZE |
| MDCL |
MATERIAL DOCUMENT AND CLASSIFICATION |
AMS 5731 ASSN STD SINGLE MATERIAL RESPONSE OVERALL OR AMS 5737,UNS K66286 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| SFTT |
SURFACE TREATMENT |
PASSIVATE OVERALL |
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