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National Stock Number:
5305-01-283-3604
Federal Supply Class:
5305
National Item Identification Number:
012833604
Description:
SCREW,CAP,HEXAGON HEAD
Detail:
An externally threaded fastener designed for insertion into holes in assembled parts, for mating with a preformed internal thread and for tightening or releasing by torquing the head. The threaded and unthreaded portions are both of the same nominal diameter of 0.190 inch (5 mm) or larger. Head dimensions and sizes of threaded and unthreaded portions shall conform to internationally recognized fastener standards. The thread length being the controlled dimension, the grip length is not specified. A locking feature may be incorporated in the design of the head or threads. Excludes BOLT, MACHINE; BOLT, EXTERNALLY RELIEVED BODY; BOLT, INTERNAL WRENCHING; and SCREW, CAP, SOCKET HEAD.
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Manufacturer Information:
| 1/4-20UNC-2AX1-3/4IN.LG,STL,ZINC | 80204 | AMERICAN NATIONAL STANDARDS INSTITUTE INCORPORATED | | MIL-DTL-1222 | 81349 | MILITARY SPECIFICATIONS PROMULGATED BY MILITARY DEPARTMENTS/AGENCIES UNDER AUTHORITY OF DEFENSE STANDARDIZATION MANUAL 4120 3-M | | MIL-S-1222 | 81349 | MILITARY SPECIFICATIONS PROMULGATED BY MILITARY DEPARTMENTS/AGENCIES UNDER AUTHORITY OF DEFENSE STANDARDIZATION MANUAL 4120 3-M |
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Techincal Specification:
| THREAD SERIES DESIGNATOR | UNC | | THREAD LENGTH | 0.750 INCHES MINIMUM | | FASTENER LENGTH | 1.710 INCHES MINIMUM AND | | 1.750 INCHES MAXIMUM | | MATERIAL | STEEL OVERALL | | HEAD STYLE | HEXAGON | | THREAD DIRECTION | RIGHT-HAND | | NOMINAL THREAD DIAMETER | 0.250 INCHES | | THREAD QUANTITY PER INCH | 20 | | THREAD CLASS | 2A | | MATERIAL DOCUMENT AND CLASSIFICATION | SAE J429 GR 5 ASSN STD SINGLE MATERIAL RESPONSE OVERALL | | SURFACE TREATMENT | ZINC OVERALL | | SURFACE TREATMENT DOCUMENT AND CLASSIFICATION | ASTM B633 ASSN STD SINGLE TREATMENT RESPONSE OVERALL | | HARDNESS RATING | 23.0 ROCKWELL C MINIMUM AND | | 34.0 ROCKWELL C MAXIMUM OVERALL | | MINIMUM TENSILE STRENGTH | 120000 POUNDS PER SQUARE INCH | | HEAD HEIGHT | 0.150 INCHES MINIMUM AND | | 0.163 INCHES MAXIMUM | | WIDTH BETWEEN FLATS | 0.428 INCHES MINIMUM AND | | 0.438 INCHES MAXIMUM | | NONDEFINITIVE SPEC/STD DATA | 1 TYPE AND | | 5 GRADE | | SPEC/STD CONTROLLING DATA | | | MANUFACTURERS CODE | 81349 | | NON-DEFINITIVE GOVERNMENT SPEC/STD REFERENCE | MIL-DTL-1222 |
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