Part Number: NAS1154-12

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CONDITION:
NS
NATIONAL AEROSPACE STANDARDS COMMITTEE AEROSPACE INDUSTRIES ASSOCIATION OF AMERICA INC NOT FOR RFQ OR SOLICITATION USE80205
THREAD CLASS3A
THREAD DIRECTIONRIGHT-HAND
THREAD LENGTH0.316 INCHES MINIMUM
FASTENER LENGTH1.051 INCHES MINIMUM AND 1.081 INCHES MAXIMUM
HEAD STYLEFLAT COUNTERSUNK
HEAD DIAMETER0.499 INCHES MINIMUM AND 0.507 INCHES MAXIMUM
GRIP DIAMETER0.2485 INCHES MINIMUM AND 0.2495 INCHES MAXIMUM
INTERNAL DRIVE STYLEOFFSET CRUCIFORM (TORQUE SET)
NOMINAL THREAD DIAMETER0.250 INCHES
GRIP LENGTH0.750 INCHES NOMINAL
THREAD QUANTITY PER INCH28
MINIMUM TENSILE STRENGTH160000 POUNDS PER SQUARE INCH
HARDNESS RATING36.0 ROCKWELL C MINIMUM OVERALL AND 40.0 ROCKWELL C MAXIMUM OVERALL
COUNTERSINK ANGLE99.0 DEGREES MINIMUM AND 101.0 DEGREES MAXIMUM
SURFACE FINISH32.0 MICROINCHES GRIP
SURFACE FINISH32.0 MICROINCHES THREADS
MATERIALSTEEL COMP 4140 OVERALL OR STEEL COMP E4340 OVERALL OR STEEL COMP 6150 OVERALL OR STEEL COMP 8735 OVERALL OR STEEL COMP 8740 OVERALL
MATERIAL DOCUMENT AND CLASSIFICATIONMIL-S-5626 MIL SPEC 1ST MATERIAL RESPONSE OVERALL OR MIL-S-5000 MIL SPEC 2ND MATERIAL RESPONSE OVERALL OR MIL-S-8503 MIL SPEC 3RD MATERIAL RESPONSE OVERALL OR MIL-S-6098 MIL SPEC 4TH MATERIAL RESPONSE OVERALL OR MIL-S-6049 MIL SPEC 5TH MATERIAL RESPONSE OVERALL
SURFACE TREATMENTCADMIUM OVERALL AND CHROMATE OVERALL
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONQQ-P-416 TY 2 CL 3 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
THREAD SERIES DESIGNATORUNJF
SPECIFICATION/STANDARD DATA80205-NAS2804 PROFESSIONAL/INDUSTRIAL ASSOCIATION STANDARD
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 ( . 1 IN.) ( . 25 mm) or less of a specific diameter for items (1. IN.) (25 mm) or less in diameter. Items over (1. IN.) (25 mm) in diameter shall have a tolerance of fifteen ten thousandths ( . 15 IN.) ( . 38 mm) or less. The nominal major diameter of the threads shall be at least one thousandth ( . 1 IN.) ( . 25 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.