5306-01-393-1296, BOLT,CLOSE TOLERANCE

National Stock Number:
5306-01-393-1296

Federal Supply Class:
5306

National Item Identification Number:
013931296

Description:
BOLT,CLOSE TOLERANCE

Detail:
An externally threaded fastener whose unthreaded portion is of a specified grip length, plated or unplated, and is machined to a tolerance of one thousandth (0.001) of an inch (0.025 mm) or less of a specific diameter for items one inch (25 mm) or less in diameter. Items over one inch (25 mm) in diameter shall have a tolerance of fifteen ten-thousandths (0.0015) of an inch (0.038 mm) or less. The nominal major diameter of the threads shall be at least one thousandth (0.001) of an inch (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 not designed to be held or driven with an inserted driver, nor is it designed for rotation by the thumb and fingers. A locking feature may be incorporated in the design of the head or threads. For items having close tolerance, and fabricated from material having 160,000 pounds per square inch (1100 megapascals) minimum tensile strength, see BOLT, SHEAR. For items fabricated from material having less than 160,000 pounds per square inch (1100 megapascals) minimum tensile strength and not having a close tolerance, see BOLT, MACHINE.

Manufacturer Information:

03A094-4-51	1W025	NORTHROP GRUMMAN SYSTEMS CORP
03A094-4-51	76823	NORTHROP GRUMMAN SYSTEMS CORPORATION
SLB131-4-51	16258	SPACE-LOK, INC.
LB57-4-51	73197	HI-SHEAR CORPORATION
AS374-4-51	84256	AVIBANK MFG., INC.
LB57-4-51	L4528	LISI AEROSPACE CANADA CORP DIV HI SHEAR HOLDINGS INC

Techincal Specification:

DISTANCE FROM HEAD LARGEST BEARING SURFACE TO SHANK HOLE CENTER	3.578 INCHES NOMINAL THREADS
FASTENER LENGTH	3.693 INCHES MINIMUM AND 3.713 INCHES MAXIMUM
GRIP DIAMETER	0.2487 INCHES MINIMUM AND 0.2492 INCHES MAXIMUM
GRIP LENGTH	3.188 INCHES MINIMUM AND 3.203 INCHES MAXIMUM
HEAD HEIGHT	0.126 INCHES MINIMUM AND 0.141 INCHES MAXIMUM
HEAD STYLE	DISHED HEXAGON
MATERIAL DOCUMENT AND CLASSIFICATION	AMS 5662 ASSN STD SINGLE MATERIAL RESPONSE FASTENER
MATERIAL DOCUMENT AND CLASSIFICATION	QQ-S-763 FED SPEC SINGLE MATERIAL RESPONSE LOCKING FEATURE
MATERIAL	NICKEL ALLOY 718 FASTENER
MATERIAL	STEEL COMP 440C LOCKING FEATURE
MATERIAL	STEEL CORROSION RESISTING SPRING
NOMINAL THREAD DIAMETER	0.250 INCHES
SHANK UNTHREADED HOLE DIAMETER	0.076 INCHES MINIMUM AND 0.086 INCHES MAXIMUM THREADS
SPECIAL FEATURES	PLUNGER PROTRUDING FROM HEAD 0.076 IN. MAX
WIDTH BETWEEN FLATS	0.430 INCHES MINIMUM AND 0.439 INCHES MAXIMUM
SURFACE FINISH	32.0 MICROINCHES GRIP
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	0.375 INCHES NOMINAL
THREAD SERIES DESIGNATOR	UNIFIED NATIONAL JOINT FINE (UNJF)
THREAD QUANTITY PER INCH	28

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