5305-00-245-5261, SCREW,CAP,HEXAGON HEAD

National Stock Number:
5305-00-245-5261

Federal Supply Class:
5305

National Item Identification Number:
002455261

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:

FFS85	81348	FEDERAL SPECIFICATIONS PROMULGATED BY GENERAL SERVICES ADMINISTRATION WASHINGTON DC
MS51108-8	96906	MILITARY STANDARDS PROMULGATED BY MILITARY DEPARTMENTS UNDER AUTHORITY OF DEFENSE STANDARDIZATION MANUAL 4120 3-M

Techincal Specification:

DISTANCE FROM HEAD LARGEST BEARING SURFACE TO SHANK HOLE CENTER	0.850 INCHES MINIMUM AND
	0.901 INCHES MAXIMUM FIRST HOLE
SHANK UNTHREADED HOLE DIAMETER	0.074 INCHES MINIMUM AND
	0.082 INCHES MAXIMUM FIRST HOLE
NONDEFINITIVE SPEC/STD DATA	2 TYPE AND
	10P STYLE AND
	8 GRADE
SPEC/STD CONTROLLING DATA
MANUFACTURERS CODE	81348
NON-DEFINITIVE GOVERNMENT SPEC/STD REFERENCE	FFS85
MANUFACTURERS CODE	96906
DEFINITIVE GOVERNMENT SPEC/STD REFERENCE	MS51108-8
THREAD SERIES DESIGNATOR	UNF
THREAD LENGTH	0.938 INCHES MINIMUM
FASTENER LENGTH	0.969 INCHES MINIMUM AND
	1.000 INCHES MAXIMUM
MATERIAL	STEEL OVERALL
HEAD STYLE	HEXAGON
THREAD DIRECTION	RIGHT-HAND
NOMINAL THREAD DIAMETER	0.250 INCHES
THREAD QUANTITY PER INCH	28
THREAD CLASS	2A
MATERIAL DOCUMENT AND CLASSIFICATION	SAE GR 8 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
SURFACE TREATMENT	PHOSPHATE ZINC OVERALL
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION	MIL-P-16232,TY Z,CL 2 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	0.150 INCHES MINIMUM AND
	0.163 INCHES MAXIMUM
WIDTH BETWEEN FLATS	0.428 INCHES MINIMUM AND
	0.437 INCHES MAXIMUM
SURFACE FINISH	63.0 MICROINCHES THREADS

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