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National Stock Number:
5306-01-452-4591
Federal Supply Class:
5306
National Item Identification Number:
014524591
Description:
BOLT,CLOSE TOLERANCE
Detail:
An externally threaded fastener whose unthreaded portion is of a specified grip length, plated or unplated, and is machined to a tolerance of one thousandth (0.001) of an inch (0.025 mm) or less of a specific diameter for items one inch (25 mm) or less in diameter. Items over one inch (25 mm) in diameter shall have a tolerance of fifteen ten-thousandths (0.0015) of an inch (0.038 mm) or less. The nominal major diameter of the threads shall be at least one thousandth (0.001) of an inch (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 not designed to be held or driven with an inserted driver, nor is it designed for rotation by the thumb and fingers. A locking feature may be incorporated in the design of the head or threads. For items having close tolerance, and fabricated from material having 160,000 pounds per square inch (1100 megapascals) minimum tensile strength, see BOLT, SHEAR. For items fabricated from material having less than 160,000 pounds per square inch (1100 megapascals) minimum tensile strength and not having a close tolerance, see BOLT, MACHINE.
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Manufacturer Information:
| 121673-4-50 | 80539 | SPS TECHNOLOGIES, LLC | | ST3M735-4-50 | 76301 | THE BOEING COMPANY |
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Techincal Specification:
| THREAD SERIES DESIGNATOR | UNJF | | NOMINAL THREAD DIAMETER | 0.250 INCHES | | THREAD QUANTITY PER INCH | 28 | | THREAD CLASS | 3A | | THREAD DIRECTION | RIGHT-HAND | | THREAD LENGTH | 0.308 INCHES MINIMUM AND | | 0.323 INCHES MAXIMUM | | FASTENER LENGTH | 3.543 INCHES MINIMUM AND | | 3.563 INCHES MAXIMUM | | MATERIAL | STEEL COMP E4340 OR | | STEEL COMP 4140 OR | | STEEL COMP 8740 OR | | STEEL COMP 4130 OR | | STEEL COMP 6150 OVERALL | | STEEL COMP 630 OR | | STEEL COMP 631 RING | | MATERIAL DOCUMENT AND CLASSIFICATION | MIL-S-5000 MIL STD 1ST MATERIAL RESPONSE OR | | MIL-S-5626 MIL STD 2ND MATERIAL RESPONSE OR | | MIL-S-6049 MIL STD 3RD MATERIAL RESPONSE OR | | MIL-S-6758 MIL STD 4TH MATERIAL RESPONSE OR | | MIL-S-8503 MIL STD 5TH MATERIAL RESPONSE OVERALL | | AMS 5643 ASSN STD 1ST MATERIAL RESPONSE OR | | AMS 5673 ASSN STD 2ND MATERIAL RESPONSE RING | | SURFACE TREATMENT | CADMIUM OVERALL | | PASSIVATE RING | | SURFACE TREATMENT DOCUMENT AND CLASSIFICATION | QQ-P-416, TYPE II,CLASS 2 FED SPEC SINGLE TREATMENT RESPONSE OVERALL | | QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE RING | | HARDNESS RATING | 36.0 ROCKWELL C MINIMUM AND | | 41.0 ROCKWELL C MAXIMUM FASTENER | | HEAD STYLE | HEXAGON | | HEAD HEIGHT | 0.105 INCHES MINIMUM AND | | 0.120 INCHES MAXIMUM | | WIDTH BETWEEN FLATS | 0.430 INCHES MINIMUM AND | | 0.439 INCHES MAXIMUM | | GRIP LENGTH | 3.125 INCHES MINIMUM AND | | 3.141 INCHES MAXIMUM | | GRIP DIAMETER | 0.2483 INCHES MINIMUM AND | | 0.2492 INCHES MAXIMUM | | SPECIAL FEATURES | DOUBLE SHEAR STRENGTH 9,300 LBS:ULTIMATE TENSILE STRENGTH 4,680 LBS | | PART NAME ASSIGNED BY CONTROLLING AGENCY | BOLT,CLOSE TOLER |
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