5305-01-581-9899, SCREW,CLOSE TOLERANCE

National Stock Number:
5305-01-581-9899

Federal Supply Class:
5305

National Item Identification Number:
015819899

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:

BACB30LH4DK26

81205

THE BOEING COMPANY

Techincal Specification:

COUNTERSINK ANGLE	99.0 DEGREES MINIMUM AND 101.0 DEGREES MAXIMUM
FASTENER LENGTH	2.111 INCHES MINIMUM AND 2.141 INCHES MAXIMUM
GRIP DIAMETER	0.248 INCHES MINIMUM AND 0.249 INCHES MAXIMUM
GRIP LENGTH	1.615 INCHES MINIMUM AND 1.635 INCHES MAXIMUM
HEAD DIAMETER	0.455 INCHES MINIMUM AND 0.510 INCHES MAXIMUM
HEAD STYLE	FLAT COUNTERSUNK
INTERNAL DRIVE STYLE	CROSS RECESS TYPE 1
MATERIAL DOCUMENT AND CLASSIFICATION	AMS 5737 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
MATERIAL	STEEL CORROSION RESISTING OVERALL
PART NAME ASSIGNED BY CONTROLLING AGENCY	BOLT, 100 DEG HEAD, CROSS RECESS, 95 KSI SHEAR, SHORT THREAD, A286 NOMINAL
PROPRIETARY CHARACTERISTICS	PACS
NOMINAL THREAD DIAMETER	0.250 INCHES
SPECIAL FEATURES	DRILLED SHANK WITH HOLE DIAMETER BETWEEN 0.076 AND 0.081 INCHES, LOCATED BETWEEN 0.106 AND 0.126 INCHES FROM THREADED END OF BOLT
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	BMS10-85, TYPE 1, CLASS A ASSN STD SINGLE TREATMENT RESPONSE OVERALL
SURFACE TREATMENT	ALUMINUM OVERALL
THREAD CLASS	3A
THREAD DIRECTION	RIGHT-HAND
THREAD LENGTH	0.384 INCHES MINIMUM AND 0.394 INCHES MAXIMUM
THREAD QUANTITY PER INCH	28
THREAD SERIES DESIGNATOR	UNF

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