5306-01-027-5250 BOLT,CLOSE TOLERANCE Index 5305-01-027-5253 SCREW,CLOSE TOLERANCE

National Stock Number:
5305-01-027-5251

Federal Supply Class:
5305

National Item Identification Number:
010275251

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:
106750-4-980539SPS TECHNOLOGIES, LLC
A147-4-997928HUCK INTL INC
GB510L4-926512NORTHROP GRUMMAN SYSTEMS CORPORATION
GB510L4-992215HOWMET GLOBAL FASTENING SYSTEMS INC
HT239PB-4-9A0170LEONARDO SPA AEROSTRUCTURE DIVISION
HT239PB4-973197HI-SHEAR CORPORATION
HT239PB4-9L4528LISI AEROSPACE CANADA CORP DIV HI SHEAR HOLDINGS INC
HT8043-4-906950HOWMET GLOBAL FASTENING SYSTEMS INC
HT8043-4-992215HOWMET GLOBAL FASTENING SYSTEMS INC


Techincal Specification:
COUNTERSINK ANGLE100.0 DEGREES NOMINAL
FASTENER LENGTH0.862 INCHES MINIMUM AND 0.909 INCHES MAXIMUM
GRIP DIAMETER0.2485 INCHES MINIMUM AND 0.2495 INCHES MAXIMUM
GRIP LENGTH0.552 INCHES MINIMUM AND 0.572 INCHES MAXIMUM
HEAD DIAMETER0.390 INCHES MINIMUM AND 0.395 INCHES MAXIMUM
HEAD STYLEFLAT COUNTERSUNK
INTERNAL DRIVE STYLEHIGH-TORQUE
MATERIALSTEEL COMP 4140 OR STEEL COMP E4340 OR STEEL COMP 6150 OR STEEL COMP 8735 OR STEEL COMP 8740 OVERALL
MINIMUM TENSILE STRENGTH160000 POUNDS PER SQUARE INCH
NOMINAL THREAD DIAMETER0.250 INCHES
SPECIFICATION/STANDARD DATA26512-GB510L MANUFACTURERS STANDARD
SURFACE FINISH63.0 MICROINCHES GRIP
SURFACE FINISH63.0 MICROINCHES THREADS
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONQQ-P-416,TY 2,CL 2 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
SURFACE TREATMENTCADMIUM AND CHROMATE OVERALL
THREAD LENGTH0.290 INCHES MINIMUM AND 0.357 INCHES MAXIMUM
THREAD CLASS3A
THREAD DIRECTIONRIGHT-HAND
THREAD SERIES DESIGNATORUNF
THREAD QUANTITY PER INCH28


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