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National Stock Number:
5305-01-309-7056
Federal Supply Class:
5305
National Item Identification Number:
013097056
Description:
SCREW,SHOULDER
Detail:
An externally threaded fastener whose threaded portion is of one nominal diameter, No 0 (0.060 IN.) (1.5 mm) or larger. It has a round unthreaded neck or shank all or part of which is of greater diameter than the threaded portion. The head is designed to be driven with either a wrench or an inserted driver or both in sizes below No. 10 (0.190 IN.) (5 mm) nominal diameter. No. 10 (0.190 IN.) (5 mm) and larger sizes must be designed for any type of inserted driver, but may also provide for external wrenching of the head. A locking feature may be incorporated in the design of the head or threads. For items which are both shouldered and have an externally relieved body, use SCREW, EXTERNALLY RELIEVED BODY. For items with a No. 10 (0.190 IN.) (5 mm) or larger thread diameter without an inserted driver head, use BOLT, SHOULDER. Excludes BOLT, INTERNAL WRENCHING and SCREW, CAP, SOCKET HEAD.
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Manufacturer Information:
| MS21301-3 | 96906 | MILITARY STANDARDS PROMULGATED BY MILITARY DEPARTMENTS UNDER AUTHORITY OF DEFENSE STANDARDIZATION MANUAL 4120 3-M |
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Techincal Specification:
| THREAD SERIES DESIGNATOR | UNC | | NOMINAL THREAD DIAMETER | 0.312 INCHES | | THREAD QUANTITY PER INCH | 18 | | THREAD CLASS | 3A | | THREAD DIRECTION | RIGHT-HAND | | THREAD LENGTH | 0.369 INCHES MINIMUM AND | | 0.389 INCHES MAXIMUM | | FASTENER LENGTH | 1.725 INCHES MINIMUM AND | | 1.755 INCHES MAXIMUM | | MATERIAL | STEEL COMP 4340 OR | | STEEL COMP E4340 OVERALL | | MATERIAL DOCUMENT AND CLASSIFICATION | AMS 6415 ASSN STD 1ST MATERIAL RESPONSE OR | | MIL-S-5000 MIL SPEC 2ND MATERIAL RESPONSE OVERALL | | HARDNESS RATING | 32.0 ROCKWELL C MINIMUM AND | | 43.0 ROCKWELL C MAXIMUM OVERALL | | HEAD STYLE | FLAT CHAMFER | | HEAD DIAMETER | 0.543 INCHES MINIMUM AND | | 0.562 INCHES MAXIMUM | | HEAD HEIGHT | 0.240 INCHES MINIMUM AND | | 0.250 INCHES MAXIMUM | | INTERNAL DRIVE STYLE | HEXAGON | | WIDTH ACROSS FLATS | 0.188 INCHES MINIMUM | | SHOULDER SHAPE | ROUND FIRST SHOULDER | | SHOULDER DIAMETER | 0.371 INCHES MINIMUM AND | | 0.373 INCHES MAXIMUM FIRST SHOULDER | | SHOULDER LENGTH | 1.245 INCHES MINIMUM AND | | 1.255 INCHES MAXIMUM FIRST SHOULDER | | SPEC/STD CONTROLLING DATA | | | MANUFACTURERS CODE | 96906 | | DEFINITIVE GOVERNMENT SPEC/STD REFERENCE | MS21301-3 |
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