5305-01-298-0639 THUMBSCREW Index 5305-01-298-0641 SCREW,CAP,SOCKET HEAD

National Stock Number:
5306-01-298-0640

Federal Supply Class:
5306

National Item Identification Number:
012980640

Description:
BOLT,INTERNALLY RELIEVED BODY

Detail:
An externally threaded fastener whose external threaded portion is of one nominal diameter. It has a concentric hole along the longitudinal centerline which may extend a part or the full length of the bolt. The concentric hole along the centerline may be counterbored and/or internally threaded at the head end or the bolt end. The head is designed to be held or driven by an external and/or internal driver. For items having a hole(s) perpendicular to the axis which meet the concentric hole along the longitudinal centerline, see BOLT, FLUID PASSAGE.


Manufacturer Information:
MS21250-1404496906MILITARY STANDARDS PROMULGATED BY MILITARY DEPARTMENTS UNDER AUTHORITY OF DEFENSE STANDARDIZATION MANUAL 4120 3-M


Techincal Specification:
CONCENTRIC HOLE DEPTH0.260 INCHES MAXIMUM
CONCENTRIC HOLE DIAMETER0.187 INCHES MAXIMUM
EXTENDED WASHER DIAMETER1.428 INCHES MINIMUM AND 1.438 INCHES MAXIMUM
EXTENDED WASHER THICKNESS0.198 INCHES NOMINAL
FASTENER LENGTH4.014 INCHES NOMINAL
FEATURES PROVIDEDCASEHARDENED
HARDNESS RATING39.0 ROCKWELL C MINIMUM AND 43.0 ROCKWELL C MAXIMUM OVERALL
HEAD HEIGHT0.808 INCHES NOMINAL
HEAD STYLEDOUBLE HEXAGON W/HOLE
MATERIAL DOCUMENT AND CLASSIFICATIONMIL-S-5626 MIL SPEC 1ST MATERIAL RESPONSE OR MIL-S-5000 MIL SPEC 2ND MATERIAL RESPONSE OR MIL-S-6049 MIL SPEC 3RD MATERIAL RESPONSE OR MIL-S-8503 MIL SPEC 4TH MATERIAL RESPONSE OVERALL
MATERIALSTEEL COMP 4140 OR STEEL COMP E4340 OR STEEL COMP 8740 OR STEEL COMP 6150 OVERALL
MINIMUM TENSILE STRENGTH180000 POUNDS PER SQUARE INCH
NOMINAL THREAD DIAMETER0.875 INCHES
SPECIAL FEATURESSURFACE FINISH ON SHANK AND BEARING SURFACE OF HEAD 32.0 MICROINCHES
WIDTH BETWEEN FLATS0.9375 INCHES NOMINAL
STYLE DESIGNATORCONCENTRIC HOLE UNTHREADED
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONQQ-P-416 TY 2 CL 3 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
SURFACE TREATMENTCADMIUM AND CHROMATE OVERALL
THREAD CLASS3A
THREAD DIRECTIONRIGHT-HAND
THREAD LENGTH1.254 INCHES MINIMUM AND 1.274 INCHES MAXIMUM
THREAD SERIES DESIGNATORUNJF
THREAD QUANTITY PER INCH14


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