5305-01-521-5144, SCREW,CLOSE TOLERANCE

National Stock Number:
5305-01-521-5144

Federal Supply Class:
5305

National Item Identification Number:
015215144

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:

BACS12HW5AU14	06725	SPS TECHNOLOGIES, LLC
BACS12HW5AU14	0ZC92	HEARTLAND PRECISION FASTENERS INC
BACS12HW5AU14	77272	THE BOEING COMPANY
BACS12HW5AU14	81205	THE BOEING COMPANY

Techincal Specification:

CRITICALITY CODE JUSTIFICATION	AGAV
FASTENER LENGTH	1.235 INCHES MINIMUM AND 1.265 INCHES MAXIMUM
GRIP LENGTH	0.865 INCHES MINIMUM AND 0.885 INCHES MAXIMUM
GRIP DIAMETER	0.3115 INCHES MINIMUM AND 0.3120 INCHES MAXIMUM
HEAD DIAMETER	0.594 INCHES MINIMUM AND 0.615 INCHES MAXIMUM
HEAD HEIGHT	0.203 INCHES MINIMUM AND 0.218 INCHES MAXIMUM
HEAD STYLE	FLAT CHAMFER
INTERNAL DRIVE STYLE	TORX
LOCKING FEATURE	PREVAILING TORQUE ALL METAL DESIGN OVERALL
MATERIAL DOCUMENT AND CLASSIFICATION	AMS 5731 A286 ASSN STD SINGLE MATERIAL RESPONSE OR AMS 5732 A286 ASSN STD SINGLE MATERIAL RESPONSE OR AMS 5737 A286 ASSN STD SINGLE MATERIAL RESPONSE OR AMS 5853 A268 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
MATERIAL	IRON ALLOY 660 OVERALL
NOMINAL THREAD DIAMETER	0.3125 INCHES
PART NAME ASSIGNED BY CONTROLLING AGENCY	SCREW, PAN HEAD, CLOSE TOLERANCE,SHORT THREAD, SIX LOBE
SPECIAL FEATURES	PER ASME B46.1. "D" DIAMETER UNDERSIDE OF HEAD, ROOT OF THREADS AND THREAD FLANKS 32 MICROINCHES RA. ALL OTHER SURFACES, 125 MICROINCHES RA.
SPLINE MAJOR DIAMETER	0.219 INCHES MINIMUM AND 0.222 INCHES MAXIMUM
SPLINE MINOR DIAMETER	0.157 INCHES MINIMUM AND 0.160 INCHES MAXIMUM
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION	AMS-QQ-P-35, TYPE II OR VIII ASSN STD SINGLE TREATMENT RESPONSE OVERALL
SURFACE TREATMENT	PASSIVATE OVERALL
THREAD CLASS	3A
THREAD DIRECTION	RIGHT-HAND
THREAD LENGTH	0.375 INCHES MINIMUM
THREAD QUANTITY PER INCH	24
THREAD SERIES DESIGNATOR	UNJF

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