MILITARY STANDARDS PROMULGATED BY MILITARY DEPARTMENTS UNDER AUTHORITY OF DEFENSE STANDARDIZATION MANUAL 4120 3-M | 96906 |
THREAD CLASS | 2A |
THREAD DIRECTION | RIGHT-HAND |
THREAD LENGTH | 0.764 INCHES MINIMUM AND 0.875 INCHES MAXIMUM |
FASTENER LENGTH | 0.875 INCHES NOMINAL |
HEAD STYLE | FLAT COUNTERSUNK |
HEAD DIAMETER | 0.568 INCHES MINIMUM AND 0.635 INCHES MAXIMUM |
INTERNAL DRIVE STYLE | CROSS RECESS TYPE 1 |
NOMINAL THREAD DIAMETER | 0.312 INCHES |
THREAD QUANTITY PER INCH | 18 |
MINIMUM TENSILE STRENGTH | 80000 POUNDS PER SQUARE INCH |
COUNTERSINK ANGLE | 80.0 DEGREES MINIMUM AND 82.0 DEGREES MAXIMUM |
SCREW MATERIAL | STEEL COMP 302 OR STEEL COMP 303 OR STEEL COMP 304 OR STEEL COMP 305 OR STEEL COMP 316 |
SCREW MATERIAL DOCUMENT AND CLASSIFICATION | 66 FED STD ALL MATERIAL RESPONSES |
SCREW SURFACE TREATMENT | PASSIVATE |
SCREW SURFACE TREATMENT DOCUMENT AND CLASSIFICATION | QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE |
THREAD SERIES DESIGNATOR | UNC |
STYLE DESIGNATOR | 102 COUNTERSINK EXTERNAL TEETH |
An externally threaded fastener whose threaded portion is of one nominal diameter, No ( . 6 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. 1 ( .19 in./5 mm). No. 1 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. |