| LOCKHEED MARTIN CORPORATION | 98897 |
| THREAD CLASS | 3A |
| THREAD DIRECTION | RIGHT-HAND |
| THREAD LENGTH | 0.291 INCHES MINIMUM AND 0.341 INCHES MAXIMUM |
| FASTENER LENGTH | 2.301 INCHES MINIMUM AND 2.331 INCHES MAXIMUM |
| HEAD STYLE | FLAT COUNTERSUNK |
| HEAD DIAMETER | 0.456 INCHES MINIMUM AND 0.508 INCHES MAXIMUM |
| GRIP DIAMETER | 0.2485 INCHES MINIMUM AND 0.2495 INCHES MAXIMUM |
| INTERNAL DRIVE STYLE | HIGH-TORQUE |
| NOMINAL THREAD DIAMETER | 0.250 INCHES |
| GRIP LENGTH | 1.990 INCHES MINIMUM AND 2.010 INCHES MAXIMUM |
| THREAD QUANTITY PER INCH | 28 |
| MINIMUM TENSILE STRENGTH | 160000 POUNDS PER SQUARE INCH |
| COUNTERSINK ANGLE | 99.0 DEGREES MINIMUM AND 101.0 DEGREES MAXIMUM |
| MATERIAL | IRON ALLOY 660 OVERALL |
| MATERIAL DOCUMENT AND CLASSIFICATION | AMS 5732 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| SURFACE TREATMENT | PASSIVATE OVERALL |
| SURFACE TREATMENT DOCUMENT AND CLASSIFICATION | QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL |
| THREAD SERIES DESIGNATOR | UNJF |
| A SCREW, MACHINE or SCREW, CAP, SOCKET HEAD whose unthreaded portion is of specified grip length, plated or unplated, and is machined to a tolerance of one thousandth ( . 1 IN.) ( . 25 mm) or less of a specific diameter for items (1. IN.) (25 mm) or less in diameter. Items over (1. IN.) (25 mm) in diameter shall have a tolerance of fifteen ten thousandths ( . 15 IN.) ( . 38 mm) or less. The nominal major diameter of the threads shall be at least one thousandth ( . 1 IN.) ( . 25 mm) below the minimum shank diameter, but not below the minimum major diameter for applicable class of fit, as shown in the Screw Thread Standards, FED STD H28 and/or other nationally recognized standards. The head is designed to be held or driven with an inserted driver. It is not designed for rotation by the thumb and fingers. A locking feature may be incorporated in the design of the head or threads. |
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