5305-00-901-4408, SCREW,CLOSE TOLERANCE

National Stock Number:
5305-00-901-4408

Federal Supply Class:
5305

National Item Identification Number:
009014408

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:

202-15500-4-12	80378	TRIUMPH AEROSTRUCTURES, LLC
AS-110-4-12	84256	AVIBANK MFG., INC.
CA4850-04-12	29372	HOWMET GLOBAL FASTENING SYSTEMS INC.
VP1072-4-12	92215	HOWMET GLOBAL FASTENING SYSTEMS INC

Techincal Specification:

DISTANCE FROM HEAD LARGEST BEARING SURFACE TO SHANK HOLE CENTER	1.095 INCHES MINIMUM AND 1.099 INCHES MAXIMUM FIRST HOLE
FASTENER LENGTH	1.167 INCHES MINIMUM AND 1.214 INCHES MAXIMUM
GRIP DIAMETER	0.2487 INCHES MINIMUM AND 0.2492 INCHES MAXIMUM
GRIP LENGTH	0.750 INCHES MINIMUM AND 0.766 INCHES MAXIMUM
HARDNESS RATING	39.0 ROCKWELL C MINIMUM AND 45.0 ROCKWELL C MAXIMUM OVERALL
HEAD HEIGHT	0.126 INCHES MINIMUM AND 0.141 INCHES MAXIMUM
HEAD STYLE	CROWNED HEXAGON
INTERNAL DRIVE STYLE	SLOT
MATERIAL DOCUMENT AND CLASSIFICATION	MIL-S-5000 MIL SPEC 1ST MATERIAL RESPONSE OR MIL-S-6049 MIL SPEC 2ND MATERIAL RESPONSE OVERALL
MATERIAL	STEEL COMP E4340 OR STEEL COMP 8740 OVERALL
NOMINAL THREAD DIAMETER	0.250 INCHES
SHANK UNTHREADED HOLE DIAMETER	0.076 INCHES MINIMUM AND 0.086 INCHES MAXIMUM FIRST HOLE
SPECIAL FEATURES	RETAINING ELEMENT IN SHANK
SURFACE FINISH	32.0 MICROINCHES BEARING SURFACE OF HEAD
SURFACE FINISH	32.0 MICROINCHES GRIP
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION	QQ-P-416 TY 2 CL 3 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
SURFACE TREATMENT	CADMIUM AND CHROMATE OVERALL
THREAD CLASS	3A
THREAD DIRECTION	RIGHT-HAND
THREAD LENGTH	0.268 INCHES MINIMUM AND 0.346 INCHES MAXIMUM
THREAD SERIES DESIGNATOR	UNIFIED NATIONAL JOINT FINE (UNJF)
THREAD QUANTITY PER INCH	28
WIDTH BETWEEN FLATS	0.430 INCHES MINIMUM AND 0.439 INCHES MAXIMUM

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