18257-003
View detailed technical data, stock status, and sourcing information for: 18257-003
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An externally threaded fastener designed for insertion into holes in assembled parts, for mating with a preformed internal thread and for tightening or releasing by torquing the head. The threaded and unthreaded portions are both of the same nominal diameter of 0.190 inch (5 mm) or larger. Head dimensions and sizes of threaded and unthreaded portions shall conform to internationally recognized fastener standards. The thread length being the controlled dimension, the grip length is not specified. A locking feature may be incorporated in the design of the head or threads. The head is not designed to be held or driven with an inserted driver or by the thumb and fingers. Excludes:bolt,machine; bolt,externally relieved body; bolt,internal wrenching; and screw,cap,socket head.
right-hand thread direction, 0.719 inches minimum and 0.750 inches maximum fastener length, 0.594 inches minimum and 0.750 inches maximum thread length, hexagon head style, 2a thread class
Product Characteristics
Below you’ll find the complete technical specifications and performance data for this part, including material details and compliance information.
- Thread Class
- 2a
- Thread Direction
- right-hand
- Thread Length
- 0.594 inches minimum and 0.750 inches maximum
- Fastener Length
- 0.719 inches minimum and 0.750 inches maximum
- Head Style
- hexagon
- Head Height
- 0.150 inches minimum and 0.163 inches maximum
- Width Between Flats
- 0.428 inches minimum and 0.438 inches maximum
- End Item Identification
- mrap - buffalo mk2a2;mrap - m-atv with cs13 pop and sne; mrap - m-atv ui; mrap - cougar tow - medium mine protected vehicle - mmpv; multiple launch rocket system (mlrs); armored multi-purpose vehicle (ampv); a4 bradley fighting vehicle; a3 bradley fighting vehicle; high-mobility artillery rocket system (himars)
- Nominal Thread Diameter
- 0.250 inches
- Thread Quantity Per Inch
- 20
- Minimum Tensile Strength
- 150000 pounds per square inch
- Criticality Code Justification
- feat
- Surface Finish
- 63.0 microinches threads
- Special Features
- weapon system essential
- Material
- steel comp 1013 or steel comp 1015 or steel comp 1016 or steel comp 1017 or steel comp 1018 or steel comp 1019 or steel comp 1020 or steel comp 1021 or steel comp 1022 or steel comp 1023 or steel comp 1524 or steel comp 1025 or steel comp 1026 or steel comp 1527 or steel comp 1029 or steel comp 1030 or steel comp 1033 or steel comp 1034 or steel comp 1035 or steel comp 1536 or steel comp 1037 or steel comp 1038 or steel comp 1039 or steel comp 1040 or steel comp 1541 overall
- Material Document And Classification
- 66 fed std all material responses overall
- Surface Treatment
- zinc and chromate overall
- Surface Treatment Document And Classification
- astm b633 ty 2 sc 3 assn std single treatment response overall
- Thread Series Designator
- unc
Replaces National Stock Numbers
Below is a list of NSNs that have been officially superseded by this NSN:
| NSN | Name | Date |
|---|---|---|
| 5305-00-004-3120 | No Name Available | 05/20/1973 |
| 5305-00-022-7433 | Hexagon Head Cap Screw | 07/01/2025 |
| 5305-00-151-9927 | No Name Available | 09/26/1971 |
| 5305-00-207-2121 | No Name Available | 09/24/2012 |
| 5305-00-680-9288 | No Name Available | 03/01/1998 |
| 5305-00-754-1677 | No Name Available | 05/17/2001 |
| 5305-01-150-4837 | No Name Available | 02/01/1985 |
| 5305-01-194-8746 | No Name Available | 09/04/1991 |
| 5306-01-214-7560 | No Name Available | 05/01/1992 |
| 5305-01-282-3383 | No Name Available | 09/01/1992 |
| 5305-01-418-7441 | No Name Available | 10/01/2015 |
| 5305-01-477-9618 | No Name Available | 12/01/2003 |
| 5305-01-621-5396 | No Name Available | 11/01/2013 |
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FAQs
Find helpful answers about installation, operation, maintenance, compliance, and troubleshooting.
What is the FSCG of the NSN 5305-00-068-0508?
Does the NSN 5305-00-068-0508 have a Schedule B code assigned?
Does NSN 5305-00-068-0508 require demilitarization?
Does NSN 5305-00-068-0508 contain precious materials?
Does NSN 5305-00-068-0508 contain hazardous materials?
When the NSN 5305-00-068-0508 was assigned to the Federal Catalog?
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