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MS21297-08024

View detailed technical data, stock status, and sourcing information for: MS21297-08024

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MS21297-08024
Federal Supply Group
Hardware and Abrasives
Federal Supply Classification
5306 Bolts
National Stock Number
5306-01-059-1088
Item Name Code
27851
Assigment Date
04/06/1978 (48 years ago)

A high strength, 160,000 pounds per square inch (1100 megapascals) minimum tensile strength externally threaded fastener designed for use in applications involving great shear stress. The head is designed to accommodate an external wrench or driver. 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. The unthreaded portion is of specific 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. A locking feature may be incorporated in the design of the head or threads. See bolt, machine and bolt, clevis.

3a thread class, right-hand thread direction, 2.338 inches minimum and 2.368 inches maximum fastener length, spline extended washer head style, 0.828 inches minimum and 0.878 inches maximum thread length

Product Characteristics

Below you’ll find the complete technical specifications and performance data for this part, including material details and compliance information.

Thread Class
3a
Thread Direction
right-hand
Thread Length
0.828 inches minimum and 0.878 inches maximum
Fastener Length
2.338 inches minimum and 2.368 inches maximum
Head Style
spline extended washer
Head Height
0.440 inches minimum and 0.460 inches maximum
Extended Washer Diameter
0.922 inches minimum and 0.932 inches maximum
Extended Washer Thickness
0.062 inches minimum and 0.082 inches maximum
Grip Diameter
0.4985 inches minimum and 0.4995 inches maximum
Nominal Thread Diameter
0.500 inches
Grip Length
1.490 inches minimum and 1.510 inches maximum
Thread Quantity Per Inch
20
Hardness Rating
46.0 rockwell c minimum and 50.0 rockwell c maximum overall
Surface Finish
32.0 microinches bearing surface of head
Surface Finish
32.0 microinches grip
Material
steel comp h11 overall
Surface Treatment
cadmium overall
Thread Series Designator
unjf

Related Parts

This NSN group includes multiple components designed to meet specific performance and operational standards. Each listing provides detailed specs, functionality data, and replacement compatibility information:

Part Number Name
MS21297-08024 Close Tolerance Bolt

FAQs

Find helpful answers about installation, operation, maintenance, compliance, and troubleshooting.

What is the FSCG of the NSN 5306-01-059-1088?
The FSCG of the NSN 5306-01-059-1088 is 5306
Does the NSN 5306-01-059-1088 have a Schedule B code assigned?
Yes, the Schedule B code is 7318152000
Does NSN 5306-01-059-1088 require demilitarization?
Items subject to the export administration regulations (ear) in parts 730-774 of title 15, code of federal regulations (cfr) (ccli or ear99) and determined by dod to present a low risk when released out of dod control. No demil, mut, or end use certificate is required. May require an export licensefrom doc.
Does NSN 5306-01-059-1088 contain precious materials?
Precious metal content is unknown
Does NSN 5306-01-059-1088 contain hazardous materials?
Indicates there is no data in the hmirs and the nsn is in a fsc not generally suspected of containing hazardous materials.
When the NSN 5306-01-059-1088 was assigned to the Federal Catalog?
It was assigned 48 years ago, on Thu, Apr 6, 1978

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Pricing

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ITAR Registered

In Stock

This item is currently available and ready for prompt shipment. Units may be offered in various conditions — new, surplus, or refurbished — and stored at verified global facilities. Request a quote to confirm current stock and delivery time.

New Surplus 1,602
New Material 184
Total 1,786
Availability of this item was last updated on: 05/01/2026 03:05 PM EDT. Stock levels and pricing are subject to change.

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