MS51959-13 REV B

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Federal Supply Group

Hardware and Abrasives

Federal Supply Classification

5305 Screws

National Stock Number

5305-01-223-8862

Item Name Code

06657

Assigment Date

01/09/1986 (40 years ago)

A washer or cone or disk shape with a centrally located hole, designed to accommodate a flat or oval head screw and provide additional bearing area on the material being fastened. It may or may not have a flush flange feature.

flat countersunk head style, 0.168 inches minimum and 0.199 inches maximum thread length, right-hand thread direction, 2a thread class, 0.219 inches minimum and 0.250 inches maximum fastener 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: 2a
Thread Direction: right-hand
Thread Length: 0.168 inches minimum and 0.199 inches maximum
Fastener Length: 0.219 inches minimum and 0.250 inches maximum
Head Style: flat countersunk
Head Diameter: 0.195 inches minimum and 0.225 inches maximum
Internal Drive Style: cross recess type 1
Nominal Thread Diameter: 0.112 inches
Thread Quantity Per Inch: 40
Minimum Tensile Strength: 80000 pounds per square inch
Countersink Angle: 80.0 degrees minimum and 82.0 degrees maximum
Screw Material: steel comp 301 or steel comp 302 or steel comp 303 or steel comp 304 or steel comp 305 or steel comp 310 or steel comp 316
Screw Material Document And Classification: qq-s-637 fed spec all material responses or 66 fed std all material responses
Screw Surface Treatment: passivate
Screw Surface Treatment Document And Classification: qq-p-35 fed spec single treatment response
Supplementary Features: mfr technical warning for tornadoweapons system appl,nsn 5305-00-770-2533 p/n ms51959-13 screw partly to short and becomes unfastened
Thread Series Designator: unc

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
418198-13	Machine Screw
MS51959-13 REV B	Machine Screw

FAQs

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

What is the FSCG of the NSN 5305-01-223-8862?

The FSCG of the NSN 5305-01-223-8862 is 5305

Does the NSN 5305-01-223-8862 have a Schedule B code assigned?

Yes, the Schedule B code is 7318152000

Does NSN 5305-01-223-8862 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 5305-01-223-8862 contain precious materials?

Precious metal content is unknown

Does NSN 5305-01-223-8862 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 5305-01-223-8862 was assigned to the Federal Catalog?

It was assigned 40 years ago, on Thu, Jan 9, 1986