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National Stock Number:
5306-00-408-6858
Federal Supply Class:
5306
National Item Identification Number:
004086858
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:
| 106467-4-21 | 80539 | SPS TECHNOLOGIES, LLC | | AS194-4-21 | 84256 | AVIBANK MFG., INC. | | CIPRD-MS27576-4-21R | 14153 | DEFENSE LOGISTICS AGENCY DBA DEFENSE SUPPLY CENTER PHILADELPHIA | | CA4510-4-21 | 29372 | HOWMET GLOBAL FASTENING SYSTEMS INC. | | MS27576-4-21 | 80205 | NATIONAL AEROSPACE STANDARDS COMMITTEE AEROSPACE INDUSTRIES ASSOCIATION OF AMERICA INC NOT FOR RFQ OR SOLICITATION USE | | MS27576-4-21 | 96906 | MILITARY STANDARDS PROMULGATED BY MILITARY DEPARTMENTS UNDER AUTHORITY OF DEFENSE STANDARDIZATION MANUAL 4120 3-M | | MS27576-4-21 | A0126 | LEONARDO SPA HELICOPTERS DIVISION -PRODUCTION SITE |
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Techincal Specification:
| DISTANCE FROM HEAD LARGEST BEARING SURFACE TO SHANK HOLE CENTER | 1.631 INCHES MINIMUM AND 1.661 INCHES MAXIMUM FIRST HOLE | | FASTENER LENGTH | 1.731 INCHES MINIMUM AND 1.751 INCHES MAXIMUM | | GRIP DIAMETER | 0.2483 INCHES MINIMUM AND 0.2492 INCHES MAXIMUM | | GRIP LENGTH | 1.312 INCHES MINIMUM AND 1.328 INCHES MAXIMUM | | HARDNESS RATING | 36.0 ROCKWELL C MINIMUM AND 41.0 ROCKWELL C MAXIMUM OVERALL | | HEAD HEIGHT | 0.126 INCHES MINIMUM AND 0.141 INCHES MAXIMUM | | HEAD STYLE | DISHED HEXAGON | | MATERIAL DOCUMENT AND CLASSIFICATION | MIL-B-83050 MIL SPEC SINGLE MATERIAL RESPONSE OVERALL | | MATERIAL | STEEL OVERALL | | NOMINAL THREAD DIAMETER | 0.250 INCHES | | SHANK UNTHREADED HOLE DIAMETER | 0.076 INCHES MINIMUM AND 0.086 INCHES MAXIMUM FIRST HOLE | | SPECIAL FEATURES | W/RETAINING ELEMENT ON SHANK | | WIDTH BETWEEN FLATS | 0.430 INCHES MINIMUM AND 0.439 INCHES MAXIMUM | | SURFACE FINISH | 63.0 MICROINCHES GRIP | | SURFACE FINISH | 63.0 MICROINCHES BEARING SURFACE OF HEAD | | SURFACE TREATMENT DOCUMENT AND CLASSIFICATION | QQ-P-416,TY 2,CL 2 FED SPEC ALL TREATMENT RESPONSES OVERALL | | SURFACE TREATMENT | CADMIUM AND CHROMATE OVERALL | | THREAD CLASS | 3A | | THREAD DIRECTION | RIGHT-HAND | | THREAD LENGTH | 0.283 INCHES MINIMUM AND 0.334 INCHES MAXIMUM | | THREAD QUANTITY PER INCH | 28 | | THREAD SERIES DESIGNATOR | UNIFIED NATIONAL JOINT FINE (UNJF) |
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