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National Stock Number:
5306-99-052-4320
Federal Supply Class:
5306
National Item Identification Number:
990524320
Description:
BOLT,MACHINE
Detail:
An externally threaded fastener designed for insertion through holes in assembled parts and normally intended to be tightened or released by torquing a nut. The threaded and unthreaded portions are both of one nominal diameter of 0.190 inch (5 mm) or larger. The head is not designed to be held or driven with an inserted driver or by the thumb and fingers. A locking feature may be incorporated in the design of the head or threads. Head dimensions and sizes of threaded and unthreaded portions shall conform to internationally recognized fastener standards. For items having a grip length portion machined to a tolerance of 0.0015 inch (0.038 mm) or less, BOLT, SHEAR. See also SCREW, CAP, HEXAGON HEAD and SCREW, MACHINE.
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Manufacturer Information:
| BLT7121 | K0378 | ROLLS-ROYCE PLC |
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Techincal Specification:
| FASTENER LENGTH | 0.740 INCHES MINIMUM AND 0.760 INCHES MAXIMUM AND 0.750 INCHES NOMINAL | | GRIP LENGTH | 0.245 INCHES MINIMUM AND 0.265 INCHES MAXIMUM | | HEAD HEIGHT | 0.130 INCHES MAXIMUM AND 0.110 INCHES MINIMUM | | HEAD DIAMETER | 0.635 INCHES MAXIMUM AND 0.615 INCHES MINIMUM | | HEAD STYLE | ROUND W/WRENCH FLATS CHAMFERED | | MATERIAL DOCUMENT AND CLASSIFICATION | BS HR650 NATIONAL STD/SPEC SINGLE MATERIAL RESPONSE | | MATERIAL | STEEL | | III PART NAME ASSIGNED BY CONTROLLING AGENCY | BOLT,CLOSE TOL,TEE HD | | NOMINAL THREAD DIAMETER | 0.250 INCHES | | SPECIAL FEATURES | UNJF MOD THD;FINISHED HD | | WIDTH BETWEEN FLATS | 0.438 INCHES MAXIMUM AND 0.431 INCHES MINIMUM | | SURFACE FINISH | 63.0 MICROMETERS BEARING SURFACE OF HEAD | | SURFACE FINISH | 125.0 MICROMETERS GRIP | | SURFACE FINISH | 125.0 MICROMETERS SIDES OF HEAD | | SURFACE FINISH | 125.0 MICROMETERS TOP OF HEAD | | THREAD CLASS | 3A | | THREAD DIRECTION | RIGHT-HAND | | THREAD LENGTH | 0.495 INCHES NOMINAL | | THREAD QUANTITY PER INCH | 28 | | THREAD SERIES DESIGNATOR | UNJF |
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