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
53 25 OCT 1968 00-121-8850

Drawings & Photos | NSN 5306-00-121-8850


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:0Nondeteriorative
Hazardous Material Indicator CodeNThere is no data in the HMIS and the NSN is in an FSC not generally suspected of containing hazardous materials
Demilitarization Code:ANon-Munitions List Item/ Non-Strategic List Item - Demilitarization not required.
Controlled Inventory Item Code:UUNCLASSIFIED
Precious Metals Indicator Code:AItem 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:0Represents 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