NSN 5306-00-121-8850 MS27576425, MS27576-4-25, AS194425
Product Details | CLOSE TOLERANCE BOLT
5306-00-121-8850 An externally threaded fastener whose unthreaded portion is of a specified grip length, plated or unplated, and is machined to a tolerance of one thousandth (0.001) of an inch (0.025 mm) or less of a specific diameter for items one inch (25 mm) or less in diameter. Items over one inch (25 mm) in diameter shall have a tolerance of fifteen ten-thousandths (0.0015) of an inch (0.038 mm) or less. The nominal major diameter of the threads shall be at least one thousandth (0.001) of an inch (0.025 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 not designed to be held or driven with an inserted driver, nor is it designed for rotation by the thumb and fingers. A locking feature may be incorporated in the design of the head or threads. For items having close tolerance, and fabricated from material having 160,000 pounds per square inch (1100 megapascals) minimum tensile strength, see BOLT, SHEAR. For items fabricated from material having less than 160,000 pounds per square inch (1100 megapascals) minimum tensile strength and not having a close tolerance, see BOLT, MACHINE.
Part Alternates: MS27576425, MS27576-4-25, AS194425, AS194-4-25, CA4510425, CA4510-4-25, CIPRDMS27576425R, CIPRD-MS27576-4-25R, 106467-4-25, 5306-00-121-8850, 00-121-8850, 5306001218850, 106467425, 001218850
Hardware and Abrasives | Bolts
| Supply Group (FSG) | NSN Assign. | NIIN | Item Name Code (INC) |
|---|---|---|---|
| 53 | 25 OCT 1968 | 00-121-8850 | 27851 ( BOLT, CLOSE TOLERANCE ) |
Demand History | NSN 5306-00-121-8850
| Part Number | Request Date | QTY | Origin |
|---|---|---|---|
| 5306-00-121-8850 | 2025-07-203 | 126 | DIBBS |
| 5306-00-121-8850 | 2015-10-286 | 195 | DIBBS |
| 5306-00-121-8850 | 2014-10-280 | 498 | DIBBS |
| 5306-00-121-8850 | 2013-05-128 | 1089 | DIBBS |
| 5306-00-121-8850 | 2013-01-18 | 104 | DIBBS |
| 5306-00-121-8850 | 2011-10-300 | 395 | DIBBS |
| 5306-00-121-8850 | 2010-12-362 | 321 | DIBBS |
| 5306-00-121-8850 | 2010-05-125 | 351 | DIBBS |
| 5306-00-121-8850 | 2010-01-21 | 279 | DIBBS |
| 5306-00-121-8850 | 2009-03-69 | 137 | DIBBS |
Cross Reference | NSN 5306-00-121-8850
| Part Number | Cage Code | Manufacturer |
|---|---|---|
| 106467-4-25 | 80539 | SPS TECHNOLOGIES, LLC DBA AEROSPACE FASTENERS GROUP |
| AS194-4-25 | 84256 | AVIBANK MFG., INC. |
| CA4510-4-25 | 29372 | ALCOA GLOBAL FASTENERS, INC. DBA ALCOA FASTENING SYSTEMS |
| CIPRD-MS27576-4-25R | 14153 | DEFENSE LOGISTICS AGENCY DBA DEFENSE SUPPLY CENTER |
| MS27576-4-25 | 80205 | NATIONAL AEROSPACE STANDARDS COMMITTEE AEROSPACE INDUSTRIES |
| MS27576-4-25 | 96906 | MILITARY STANDARDS PROMULGATED BY MILITARY DEPARTMENTS |
| MS27576-4-25R | 0UCY9 | M.S. AEROSPACE INC. |
| MS27576-4-25R | 80539 | SPS TECHNOLOGIES, LLC DBA AEROSPACE FASTENERS GROUP |
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Technical Data | NSN 5306-00-121-8850
| Characteristic | Specifications |
|---|---|
| THREAD SERIES DESIGNATOR | UNJF |
| NOMINAL THREAD DIAMETER | 0.250 INCHES |
| THREAD QUANTITY PER INCH | 28 |
| THREAD CLASS | 3A |
| THREAD DIRECTION | RIGHT-HAND |
| THREAD LENGTH | 0.283 INCHES MINIMUM AND 0.334 INCHES MAXIMUM |
| FASTENER LENGTH | 1.991 INCHES MINIMUM AND 2.001 INCHES MAXIMUM |
| MATERIAL | STEEL OVERALL |
| MATERIAL DOCUMENT AND CLASSIFICATION | MIL-B-83050 MIL SPEC SINGLE MATERIAL RESPONSE OVERALL |
| SURFACE TREATMENT | CADMIUM AND CHROMATE OVERALL |
| SURFACE TREATMENT DOCUMENT AND CLASSIFICATION | QQ-P-416 TY 2 CL 2 FED SPEC ALL TREATMENT RESPONSES OVERALL |
| HARDNESS RATING | 36.0 ROCKWELL C MINIMUM AND 41.0 ROCKWELL C MAXIMUM OVERALL |
| HEAD STYLE | C3 DISHED HEXAGON |
| HEAD HEIGHT | 0.126 INCHES MINIMUM AND 0.141 INCHES MAXIMUM |
| WIDTH BETWEEN FLATS | 0.430 INCHES MINIMUM AND 0.439 INCHES MAXIMUM |
| GRIP LENGTH | 1.562 INCHES MINIMUM AND 1.578 INCHES MAXIMUM |
| GRIP DIAMETER | 0.2483 INCHES MINIMUM AND 0.2492 INCHES MAXIMUM |
| SURFACE FINISH | 63.0 MICROINCHES BEARING SURFACE OF HEAD 63.0 MICROINCHES GRIP |
| DISTANCE FROM HEAD LARGEST BEARING SURFACE TO SHANK HOLE CENTER | 1.881 INCHES MINIMUM AND 1.911 INCHES MAXIMUM FIRST HOLE |
| SHANK UNTHREADED HOLE DIAMETER | 0.076 INCHES MINIMUM AND 0.086 INCHES MAXIMUM FIRST HOLE |
| SPECIAL FEATURES | W/RETAINING ELEMENT ON SHANK |
Restrictions/Controls & Freight Information | NSN 5306-00-121-8850
| Category | Code | Description |
|---|---|---|
| Shelf-Life Code: | 0 | Nondeteriorative |
| Hazardous Material Indicator Code | N | There is no data in the HMIS and the NSN is in an FSC not generally suspected of containing hazardous materials |
| Demilitarization Code: | A | Non-Munitions List Item/ Non-Strategic List Item - Demilitarization not required. |
| Controlled Inventory Item Code: | U | UNCLASSIFIED |
| Precious Metals Indicator Code: | A | Item does not contain precious metal |
| Criticality Code: | X | The item does not have a nuclear hardened feature or any other critical feature such as tolerance, fit restriction or application. |
| Automatic Data Processing Equipment: | 0 | Represents items with no ADP components. NOTE: Codes 1 through 6 are only to be used when the item is Automatic Data Processing Equipment (ADPE) in its entirety and is limited to the type meeting only one of the definitions for codes 1 through 6. (See code 9) |
| Category | Code | Description |
|---|---|---|
| No Freight Information | ||



