5305-01-272-9977, SCREW,CLOSE TOLERANCE

National Stock Number:
5305-01-272-9977

Federal Supply Class:
5305

National Item Identification Number:
012729977

Description:
SCREW,CLOSE TOLERANCE

Detail:
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.

Manufacturer Information:

122995D-4-11D	80539	SPS TECHNOLOGIES, LLC
GB510DE4-11D	26512	NORTHROP GRUMMAN SYSTEMS CORPORATION
HR203-4-11D	03950	NAVAL INVENTORY CONTROL POINT MECHANICSBURG
PBF1360-4-11D	27624	SPS TECHNOLOGIES LLC
HR203-4-11D	73197	HI-SHEAR CORPORATION
HR203-4-11D	L4528	LISI AEROSPACE CANADA CORP DIV HI SHEAR HOLDINGS INC
SCD1780-4-11D	06950	HOWMET GLOBAL FASTENING SYSTEMS INC

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	0.351 INCHES MINIMUM AND
	0.418 INCHES MAXIMUM
FASTENER LENGTH	1.049 INCHES MINIMUM AND
	1.096 INCHES MAXIMUM
MATERIAL	STEEL COMP H11 OVERALL
MATERIAL DOCUMENT AND CLASSIFICATION	AMS 6487 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
SURFACE TREATMENT	CADMIUM AND
	CHROMATE OVERALL
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION	MIL-C-8837 TYPE 2 CLASS 2 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL
HARDNESS RATING	51.0 ROCKWELL C MINIMUM AND
	54.0 ROCKWELL C MAXIMUM OVERALL
MINIMUM TENSILE STRENGTH	156000 POUNDS PER SQUARE INCH
HEAD STYLE	FLAT COUNTERSUNK
HEAD DIAMETER	0.464 INCHES MINIMUM AND
	0.507 INCHES MAXIMUM
COUNTERSINK ANGLE	99.0 DEGREES MINIMUM AND
	101.0 DEGREES MAXIMUM
INTERNAL DRIVE STYLE	TORQUE-SET RIBBED
GRIP LENGTH	0.678 INCHES MINIMUM AND
	0.698 INCHES MAXIMUM
GRIP DIAMETER	0.2485 INCHES MINIMUM AND
	0.2495 INCHES MAXIMUM
SURFACE FINISH	32.0 MICROINCHES BEARING SURFACE OF HEAD
	32.0 MICROINCHES GRIP
	32.0 MICROINCHES THREADS
DISTANCE FROM HEAD LARGEST BEARING SURFACE TO SHANK HOLE CENTER	0.881 INCHES MINIMUM AND
	0.913 INCHES MAXIMUM FIRST HOLE
SHANK UNTHREADED HOLE DIAMETER	0.071 INCHES MINIMUM AND
	0.081 INCHES MAXIMUM FIRST HOLE
PART NAME ASSIGNED BY CONTROLLING AGENCY	NAVY SPECIAL PROJECT

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