MS21125B418

View detailed technical data, stock status, and sourcing information for: MS21125B418
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Federal Supply Group

Hardware and Abrasives

Federal Supply Classification

5305 Screws

National Stock Number

5305-01-190-3012

Item Name Code

29294

Assigment Date

09/25/1984 (41 years ago)

A headed fastener threaded externally on a portion or on the full length of the shank. The head has projections on the underside or periphery, or is otherwise designed to be mechanically pressed and embedded in a metallic panel, or the like. It is securely locked in position by the displaced metal. For items that require locking rings, see bolt, self-locking and stud, locked in. Excludes:insert, screw thread.

flat chamfer head style, right-hand thread direction, 3a thread class, 0.277 inches minimum and 0.328 inches maximum thread length, 1.543 inches minimum and 1.563 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: 3a
Thread Direction: right-hand
Thread Length: 0.277 inches minimum and 0.328 inches maximum
Fastener Length: 1.543 inches minimum and 1.563 inches maximum
Head Style: flat chamfer
Head Diameter: 0.477 inches minimum and 0.492 inches maximum
Head Height: 0.126 inches minimum and 0.141 inches maximum
Locking Feature: detent ball grip
Grip Diameter: 0.2487 inches minimum and 0.2492 inches maximum
Shank Unthreaded Hole Diameter: 0.076 inches minimum and 0.086 inches maximum first hole
Internal Drive Style: slot
Nominal Thread Diameter: 0.250 inches
Grip Length: 1.125 inches minimum and 1.141 inches maximum
Thread Quantity Per Inch: 28
Minimum Tensile Strength: 63000 pounds per square inch
Distance From Head Largest Bearing Surface To Shank Hole Center: 1.448 inches minimum and 1.468 inches maximum first hole
Surface Finish: 32.0 microinches bearing surface of head
Surface Finish: 32.0 microinches grip
Material: steel comp 631 or steel comp 302 spring
Material: steel comp 632 fastener
Material Document And Classification: astm a580 cond. a assn std single material response spring
Surface Treatment: passivate overall
Surface Treatment Document And Classification: qq-p-35 fed spec single treatment response 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
5305PL0783960	Close Tolerance Screw
MS21125B418	Close Tolerance Screw

FAQs

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

What is the FSCG of the NSN 5305-01-190-3012?

The FSCG of the NSN 5305-01-190-3012 is 5305

Does the NSN 5305-01-190-3012 have a Schedule B code assigned?

Yes, the Schedule B code is 7318152000

Does NSN 5305-01-190-3012 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 5305-01-190-3012 contain precious materials?

Item does not contain precious metal.

Does NSN 5305-01-190-3012 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 5305-01-190-3012 was assigned to the Federal Catalog?

It was assigned 41 years ago, on Tue, Sep 25, 1984