5305-01-197-6604, SCREW,CLOSE TOLERANCE

National Stock Number:
5305-01-197-6604

Federal Supply Class:
5305

National Item Identification Number:
011976604

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:

106706T-4-21	80539	SPS TECHNOLOGIES, LLC
GB510CE4-21	26512	NORTHROP GRUMMAN SYSTEMS CORPORATION
HR204-4-21	03950	NAVAL INVENTORY CONTROL POINT MECHANICSBURG
HR204-4-21	73197	HI-SHEAR CORPORATION
HT8181F4-21	92215	HOWMET GLOBAL FASTENING SYSTEMS INC
HR204-4-21	L4528	LISI AEROSPACE CANADA CORP DIV HI SHEAR HOLDINGS INC
SC17794-21	06950	HOWMET GLOBAL FASTENING SYSTEMS INC
PBF1202-4-21	27624	SPS TECHNOLOGIES LLC
SFH22-4A21	56878	SPS TECHNOLOGIES, LLC

Techincal Specification:

COUNTERSINK ANGLE	99.0 DEGREES MINIMUM AND 101.0 DEGREES MAXIMUM
FASTENER LENGTH	1.708 INCHES MINIMUM AND 1.755 INCHES MAXIMUM
GRIP DIAMETER	0.2485 INCHES MINIMUM AND 0.2495 INCHES MAXIMUM
GRIP LENGTH	1.302 INCHES MINIMUM AND 1.322 INCHES MAXIMUM
HARDNESS RATING	46.0 ROCKWELL C MINIMUM AND 50.0 ROCKWELL C MAXIMUM OVERALL
HEAD DIAMETER	0.464 INCHES MINIMUM AND 0.507 INCHES MAXIMUM
HEAD STYLE	FLAT COUNTERSUNK
INTERNAL DRIVE STYLE	OFFSET CRUCIFORM (TORQUE SET)
MATERIAL DOCUMENT AND CLASSIFICATION	AMS 6487 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
MATERIAL	STEEL COMP H11 OVERALL
MINIMUM TENSILE STRENGTH	220000 POUNDS PER SQUARE INCH
NOMINAL THREAD DIAMETER	0.250 INCHES
PART NAME ASSIGNED BY CONTROLLING AGENCY	NAVY SPECIAL PROJECT
SPECIAL FEATURES	INTERNAL DRIVE RIBBED
SURFACE FINISH	32.0 MICROINCHES GRIP
SURFACE FINISH	32.0 MICROINCHES THREADS
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION	NAS 672 ASSN STD 1ST TREATMENT RESPONSE OR MIL-C-8837,TY 2 CL 3 MIL SPEC 2ND TREATMENT RESPONSE OVERALL
SURFACE TREATMENT	CADMIUM OR CADMIUM AND CHROMATE OVERALL
THREAD DIRECTION	RIGHT-HAND
THREAD CLASS	3A
THREAD LENGTH	0.386 INCHES MINIMUM AND 0.453 INCHES MAXIMUM
THREAD SERIES DESIGNATOR	UNJF
THREAD QUANTITY PER INCH	28

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