5305-01-255-6541, SCREW,CAP,SOCKET HEAD

National Stock Number:
5305-01-255-6541

Federal Supply Class:
5305

National Item Identification Number:
012556541

Description:
SCREW,CAP,SOCKET HEAD

Detail:
An externally threaded fastener whose threaded portion is of one nominal diameter. The head has an internal socket or multiple spline for use with an inserted driver. A locking feature may be incorporated in the design of the head or threads. Excludes items with bevel (conical) heads. See BOLT, INTERNAL WRENCHING. Excludes SCREW, SHOULDER; and SCREW, MACHINE.

Manufacturer Information:

LD111-0058-0406

43999

THE BOEING COMPANY

Techincal Specification:

THREAD SERIES DESIGNATOR	UNJF
NOMINAL THREAD DIAMETER	0.250 INCHES
THREAD QUANTITY PER INCH	28
THREAD CLASS	3A
THREAD DIRECTION	RIGHT-HAND
THREAD LENGTH	0.330 INCHES MINIMUM AND
	0.451 INCHES MAXIMUM
FASTENER LENGTH	0.786 INCHES MINIMUM AND
	0.816 INCHES MAXIMUM
MATERIAL	IRON ALLOY 660 OVERALL
MATERIAL DOCUMENT AND CLASSIFICATION	AMS5731 ASSN STD SINGLE MATERIAL RESPONSE OR
	AMS5732 ASSN STD SINGLE MATERIAL RESPONSE OR
	AMS5737 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
SURFACE TREATMENT	PASSIVATE OVERALL
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION	QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
HARDNESS RATING	24.0 ROCKWELL C MINIMUM AND
	35.0 ROCKWELL C MAXIMUM OVERALL
MINIMUM TENSILE STRENGTH	140000 POUNDS PER SQUARE INCH
MINIMUM YIELD STRENGTH	85000 POUNDS PER SQUARE INCH
HEAD STYLE	PAN NO. 2
HEAD DIAMETER	0.477 INCHES MINIMUM AND
	0.492 INCHES MAXIMUM
HEAD HEIGHT	0.140 INCHES MINIMUM AND
	0.150 INCHES MAXIMUM
INTERNAL DRIVE STYLE	HEXAGON
WIDTH ACROSS FLATS	0.188 INCHES MINIMUM AND
	0.190 INCHES MAXIMUM
SURFACE FINISH	32.0 MICROINCHES BEARING SURFACE OF HEAD
	32.0 MICROINCHES GRIP
	32.0 MICROINCHES THREADS

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