5305-00-409-3240, SCREW,CLOSE TOLERANCE

5360-00-409-3241 SPRING,HELICAL,COMPRESSION

National Stock Number:
5305-00-409-3240

Federal Supply Class:
5305

National Item Identification Number:
004093240

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:

BACB30ABP8-35A	81205	THE BOEING COMPANY
BACB30LU8-31	06710	VALLEY-TODECO, INC.
BACB30LU8-31	06725	SPS TECHNOLOGIES, LLC
BACB30LU8-31	06950	HOWMET GLOBAL FASTENING SYSTEMS INC
BACB30LU8-31	17446	HUCK INTERNATIONAL, INC
BACB30LU8-31	17943	FEDERAL MANUFACTURING CORP
BACB30LU8-31	1RC86	HOWMET GLOBAL FASTENING SYSTEMS INC
BACB30LU8-31	56878	SPS TECHNOLOGIES, LLC
BACB30LU8-31	81205	THE BOEING COMPANY

Techincal Specification:

COUNTERSINK ANGLE	99.0 DEGREES MINIMUM AND 101.0 DEGREES MAXIMUM
FASTENER LENGTH	2.437 INCHES MINIMUM AND 2.469 INCHES MAXIMUM
GRIP DIAMETER	0.4982 INCHES MINIMUM AND 0.4991 INCHES MAXIMUM
GRIP LENGTH	1.928 INCHES MINIMUM AND 1.948 INCHES MAXIMUM
HARDNESS RATING	36.0 ROCKWELL C MINIMUM AND 40.0 ROCKWELL C MAXIMUM OVERALL
HEAD DIAMETER	0.929 INCHES MINIMUM AND 1.024 INCHES MAXIMUM
HEAD STYLE	FLAT COUNTERSUNK
INTERNAL DRIVE STYLE	CROSS RECESS TYPE 1
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 OR AMS 6300 ASSN STD 6TH MATERIAL RESPONSE OVERALL
MATERIAL	STEEL COMP 4140 OR STEEL COMP E4340 OR STEEL COMP 6150 OR STEEL COMP 8735 OR STEEL COMP 8740 OR STEEL COMP 4037 OVERALL
MINIMUM TENSILE STRENGTH	160000 POUNDS PER SQUARE INCH
NOMINAL THREAD DIAMETER	0.500 INCHES
SPECIFICATION/STANDARD DATA	81205-BACB30AB MANUFACTURERS STANDARD
SURFACE FINISH	63.0 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	0.489 INCHES MINIMUM AND 0.541 INCHES MAXIMUM
THREAD QUANTITY PER INCH	20
THREAD SERIES DESIGNATOR	UNF

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