| WOODWARD HRT, INC. | 81873 |
| THREAD CLASS | 3A |
| THREAD DIRECTION | RIGHT-HAND |
| THREAD LENGTH | 0.380 INCHES MINIMUM AND 0.400 INCHES MAXIMUM |
| FASTENER LENGTH | 1.175 INCHES MINIMUM AND 1.185 INCHES MAXIMUM |
| HEAD STYLE | FLAT CHAMFER |
| HEAD DIAMETER | 0.470 INCHES MINIMUM AND 0.490 INCHES MAXIMUM |
| HEAD HEIGHT | 0.140 INCHES MINIMUM AND 0.170 INCHES MAXIMUM |
| SHOULDER DIAMETER | 0.3115 INCHES MINIMUM FIRST SHOULDER AND 0.3120 INCHES MAXIMUM FIRST SHOULDER |
| SHOULDER LENGTH | 0.785 INCHES MINIMUM FIRST SHOULDER AND 0.795 INCHES MAXIMUM FIRST SHOULDER |
| SHANK UNTHREADED HOLE DIAMETER | 0.076 INCHES MINIMUM FIRST HOLE AND 0.086 INCHES MAXIMUM FIRST HOLE |
| INTERNAL DRIVE STYLE | SLOT |
| NOMINAL THREAD DIAMETER | 0.250 INCHES |
| THREAD QUANTITY PER INCH | 28 |
| MINIMUM TENSILE STRENGTH | 135000 POUNDS PER SQUARE INCH |
| DISTANCE FROM HEAD LARGEST BEARING SURFACE TO SHANK HOLE CENTER | 1.025 INCHES MINIMUM FIRST HOLE AND 1.055 INCHES MAXIMUM FIRST HOLE |
| CHAMFER ANGLE | 45.0 DEGREES NOMINAL |
| SHOULDER SHAPE | ROUND FIRST SHOULDER |
| MATERIAL | STEEL CORROSION RESISTING OVERALL |
| MATERIAL DOCUMENT AND CLASSIFICATION | MIL-S-18732 MFR REF SINGLE MATERIAL RESPONSE OVERALL |
| SURFACE TREATMENT | PASSIVATE OVERALL |
| SURFACE TREATMENT DOCUMENT AND CLASSIFICATION | HRPS 161,FSCM 81873 MFR REF SINGLE TREATMENT RESPONSE OVERALL |
| THREAD SERIES DESIGNATOR | UNF |
| CONSTRUCTION | ONE-PIECE |
| An externally threaded fastener whose threaded portion is of one nominal diameter, No ( . 6 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. 1 ( .19 IN.) (5 mm) nominal diameter. No. 1 ( .19 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. 1 ( .19 IN.) (5 mm) or larger thread diameter without an inserted driver head, use BOLT, SHOULDER. Excludes BOLT, INTERNAL WRENCHING and SCREW, CAP, SOCKET HEAD. |
