5305-01-010-3880, SCREW,CLOSE TOLERANCE

National Stock Number:
5305-01-010-3880

Federal Supply Class:
5305

National Item Identification Number:
010103880

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:

A51B25610-11	26512	NORTHROP GRUMMAN SYSTEMS CORPORATION
A51B25610-11	61174	NORTHROP GRUMMAN SYSTEMS CORPORATION
A51B25610-11	79RG9	NORTHROP GRUMMAN SYSTEMS CORPORATION

Techincal Specification:

HARDNESS RATING	35.0 ROCKWELL C MINIMUM AND
	39.0 ROCKWELL C MAXIMUM OVERALL
HEAD STYLE	FLAT COUNTERSUNK
HEAD DIAMETER	0.328 INCHES MINIMUM AND
	0.385 INCHES MAXIMUM
COUNTERSINK ANGLE	99.0 DEGREES MINIMUM AND
	101.0 DEGREES MAXIMUM
INTERNAL DRIVE STYLE	CROSS RECESS TYPE 1
GRIP LENGTH	0.220 INCHES NOMINAL
GRIP DIAMETER	0.1881 INCHES MINIMUM AND
	0.1887 INCHES MAXIMUM
DISTANCE FROM HEAD LARGEST BEARING SURFACE TO SHANK HOLE CENTER	0.900 INCHES NOMINAL FIRST HOLE
SHANK UNTHREADED HOLE DIAMETER	0.070 INCHES MINIMUM AND
	0.080 INCHES MAXIMUM FIRST HOLE
THE MANUFACTURERS DATA
MANUFACTURERS CODE	61174
DESIGN CONTROL REFERENCE	A51B25610-11
THREAD SERIES DESIGNATOR	UNJF
NOMINAL THREAD DIAMETER	0.190 INCHES
THREAD QUANTITY PER INCH	32
THREAD CLASS	3A
THREAD DIRECTION	RIGHT-HAND
THREAD LENGTH	0.780 INCHES NOMINAL
FASTENER LENGTH	1.000 INCHES NOMINAL
MATERIAL	STEEL COMP 4140 OR
	STEEL COMP E4340 OR
	STEEL COMP 6150 OR
	STEEL COMP 8735 OR
	STEEL COMP 8740 OVERALL
MATERIAL DOCUMENT AND CLASSIFICATION	MIL-S-5626 MIL SPEC 1ST MATERIAL RESPONSE OR
	MIL-S-5000 MIL SPEC 2ND MATERIAL RESPONSE OR
	MIL-S-8503 MIL SPEC 3RD MATERIAL RESPONSE OR
	MIL-S-6098 MIL SPEC 4TH MATERIAL RESPONSE OR
	MIL-S-6049 MIL SPEC 5TH MATERIAL RESPONSE OVERALL
SURFACE TREATMENT	CADMIUM OVERALL
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION	QQ-P-416 FED SPEC SINGLE TREATMENT RESPONSE OVERALL

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