5305-01-287-2908, SCREW,CAP,HEXAGON HEAD

National Stock Number:
5305-01-287-2908

Federal Supply Class:
5305

National Item Identification Number:
012872908

Description:
SCREW,CAP,HEXAGON HEAD

Detail:
An externally threaded fastener designed for insertion into holes in assembled parts, for mating with a preformed internal thread and for tightening or releasing by torquing the head. The threaded and unthreaded portions are both of the same nominal diameter of 0.190 inch (5 mm) or larger. Head dimensions and sizes of threaded and unthreaded portions shall conform to internationally recognized fastener standards. The thread length being the controlled dimension, the grip length is not specified. A locking feature may be incorporated in the design of the head or threads. Excludes BOLT, MACHINE; BOLT, EXTERNALLY RELIEVED BODY; BOLT, INTERNAL WRENCHING; and SCREW, CAP, SOCKET HEAD.

Manufacturer Information:

FF-S-85	81348	FEDERAL SPECIFICATIONS PROMULGATED BY GENERAL SERVICES ADMINISTRATION WASHINGTON DC
MS51108-191	96906	MILITARY STANDARDS PROMULGATED BY MILITARY DEPARTMENTS UNDER AUTHORITY OF DEFENSE STANDARDIZATION MANUAL 4120 3-M

Techincal Specification:

THREAD SERIES DESIGNATOR	UNF
THREAD LENGTH	2.000 INCHES MINIMUM AND
	2.188 INCHES MAXIMUM
FASTENER LENGTH	3.312 INCHES MINIMUM AND
	3.500 INCHES MAXIMUM
MATERIAL	STEEL OVERALL
HEAD STYLE	HEXAGON
THREAD DIRECTION	RIGHT-HAND
NOMINAL THREAD DIAMETER	0.875 INCHES
THREAD QUANTITY PER INCH	14
THREAD CLASS	2A
MATERIAL DOCUMENT AND CLASSIFICATION	SAE GR8 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
SURFACE TREATMENT	PHOSPHATE ZINC OVERALL
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION	D0D-P-16232 TYZ MIL SPEC SINGLE TREATMENT RESPONSE OVERALL
HARDNESS RATING	32.0 ROCKWELL C MINIMUM AND
	38.0 ROCKWELL C MAXIMUM OVERALL
MINIMUM TENSILE STRENGTH	150000 POUNDS PER SQUARE INCH
HEAD HEIGHT	0.531 INCHES MINIMUM AND
	0.563 INCHES MAXIMUM
WIDTH BETWEEN FLATS	1.285 INCHES MINIMUM AND
	1.312 INCHES MAXIMUM
SURFACE FINISH	63.0 MICROINCHES THREADS
DISTANCE FROM HEAD LARGEST BEARING SURFACE TO SHANK HOLE CENTER	3.052 INCHES MINIMUM AND
	3.260 INCHES MAXIMUM FIRST HOLE
SHANK UNTHREADED HOLE DIAMETER	0.138 INCHES MINIMUM AND
	0.146 INCHES MAXIMUM FIRST HOLE
NONDEFINITIVE SPEC/STD DATA	2 TYPE AND
	10 STYLE AND
	8 GRADE
SPEC/STD CONTROLLING DATA
MANUFACTURERS CODE	81348
NON-DEFINITIVE GOVERNMENT SPEC/STD REFERENCE	FF-S-85
MANUFACTURERS CODE	96906
DEFINITIVE GOVERNMENT SPEC/STD REFERENCE	MS51108-191

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