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National Stock Number:
5305-00-514-8997
Federal Supply Class:
5305
National Item Identification Number:
005148997
Description:
SCREW,MACHINE
Detail:
An externally threaded fastener whose threaded portion is of one nominal diameter, No 0 (0.060 in./1.5 mm) or larger, designed to be held or driven with either a wrench or an inserted driver or both (excluding internal socket or internal multiple spline types), in sizes below No. 10 (0.190 in./5 mm). No. 10 and larger sizes must have a head designed for any type inserted driver (excluding internal socket or internal multiple spline types), but may also be designed for external wrenching. A locking feature may be incorporated in the design of the head or threads. Excludes BOLT, CLEVIS; BOLT, EXTERNALLY RELIEVED BODY; SCREW, EXTERNALLY RELIEVED BODY; and SCREW, ASSEMBLED WASHER. See also, SCREW, INSTRUMENT; BOLT, MACHINE; BOLT, INTERNAL WRENCHING; and SCREW, CAP SOCKET HEAD.
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Techincal Specification:
| COUNTERSINK ANGLE | 89.0 DEGREES MINIMUM AND 91.0 DEGREES MAXIMUM | | FASTENER LENGTH | 0.312 INCHES NOMINAL | | HARDNESS RATING | 43.0 ROCKWELL D MINIMUM AND 47.0 ROCKWELL D MAXIMUM | | HEAD DIAMETER | 0.335 INCHES MINIMUM AND 0.350 INCHES MAXIMUM | | HEAD STYLE | OVAL COUNTERSUNK | | INTERNAL DRIVE STYLE | SLOT | | NOMINAL THREAD DIAMETER | 0.250 INCHES | | SCREW MATERIAL DOCUMENT AND CLASSIFICATION | QQ-S-634 FED SPEC SINGLE MATERIAL RESPONSE | | SCREW MATERIAL | STEEL COMP 1035 | | SCREW SURFACE TREATMENT DOCUMENT AND CLASSIFICATION | MIL-P-16232 MIL SPEC SINGLE TREATMENT RESPONSE | | SCREW SURFACE TREATMENT | PHOSPHATE | | SPECIAL FEATURES | 0.031 IN. BY 45.0 DEG CHAMFER AT END OF SHANK | | THREAD CLASS | 2A | | THREAD DIRECTION | RIGHT-HAND | | THREAD LENGTH | 0.252 INCHES MINIMUM | | THREAD QUANTITY PER INCH | 28 | | THREAD SERIES DESIGNATOR | UNF |
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