5305-01-454-3898, SCREW,CLOSE TOLERANCE

National Stock Number:
5305-01-454-3898

Federal Supply Class:
5305

National Item Identification Number:
014543898

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:

124379-4D12	80539	SPS TECHNOLOGIES, LLC
GB510FG4D12	26512	NORTHROP GRUMMAN SYSTEMS CORPORATION
PBF1475-4D12	27624	SPS TECHNOLOGIES LLC
VCL0009-4D12	06710	VALLEY-TODECO, INC.

Techincal Specification:

DISTANCE FROM HEAD LARGEST BEARING SURFACE TO SHANK HOLE CENTER	0.818 INCHES NOMINAL FIRST HOLE
COUNTERSINK ANGLE	99.0 DEGREES MINIMUM AND 101.0 DEGREES MAXIMUM
FASTENER LENGTH	1.159 INCHES MINIMUM AND 1.206 INCHES MAXIMUM
GRIP DIAMETER	0.2490 INCHES MINIMUM AND 0.2495 INCHES MAXIMUM
GRIP LENGTH	0.740 INCHES MINIMUM AND 0.760 INCHES MAXIMUM
HEAD DIAMETER	0.464 INCHES MINIMUM AND 0.507 INCHES MAXIMUM
HEAD STYLE	FLAT COUNTERSUNK
INTERNAL DRIVE STYLE	OFFSET CRUCIFORM (TORQUE SET)
MATERIAL DOCUMENT AND CLASSIFICATION	AMS 5662 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
MATERIAL	NICKEL ALLOY 718 OVERALL
MINIMUM TENSILE STRENGTH	220000 POUNDS PER SQUARE INCH
NOMINAL THREAD DIAMETER	0.250 INCHES
SHANK UNTHREADED HOLE DIAMETER	0.065 INCHES MINIMUM AND 0.075 INCHES MAXIMUM FIRST HOLE
SURFACE FINISH	32.0 MICROINCHES BEARING SURFACE OF HEAD
SURFACE FINISH	32.0 MICROINCHES GRIP
SURFACE FINISH	32.0 MICROINCHES THREADS
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION	QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
SURFACE TREATMENT	PASSIVATE OVERALL
THREAD CLASS	3A
THREAD DIRECTION	RIGHT-HAND
THREAD LENGTH	0.425 INCHES NOMINAL
THREAD QUANTITY PER INCH	28
THREAD SERIES DESIGNATOR	UNJF

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