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 | 0.714 INCHES MINIMUM AND 0.750 INCHES MAXIMUM |
FASTENER LENGTH | 0.750 INCHES NOMINAL |
HEAD STYLE | PAN |
HEAD DIAMETER | 0.155 INCHES MINIMUM AND 0.167 INCHES MAXIMUM |
HEAD HEIGHT | 0.053 INCHES MINIMUM AND 0.062 INCHES MAXIMUM |
INTERNAL DRIVE STYLE | CROSS RECESS TYPE 1 |
NOMINAL THREAD DIAMETER | 0.086 INCHES |
THREAD QUANTITY PER INCH | 56 |
MINIMUM TENSILE STRENGTH | 57000 POUNDS PER SQUARE INCH |
SCREW MATERIAL | COPPER ALLOY |
SCREW MATERIAL DOCUMENT AND CLASSIFICATION | QQ-B-626 FED SPEC SINGLE MATERIAL RESPONSE OR QQ-W-321 FED SPEC SINGLE MATERIAL RESPONSE |
THREAD SERIES DESIGNATOR | UNC |
NONDEFINITIVE SPEC/STD DATA | 3 TYPE AND 2C STYLE |
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. |