MS16998-76L

View detailed technical data, stock status, and sourcing information for: MS16998-76L
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Federal Supply Group

Hardware and Abrasives

Federal Supply Classification

5305 Screws

National Stock Number

5305-01-236-1621

Item Name Code

16282

Assigment Date

07/14/1986 (40 years ago)

An externally threaded fastener whose threaded portion is of one nominal diameter. The head has an internal socket or multiple spline for use with an inserted driver. A locking feature may be incorporated in the design of the head or threads. Excludes:items with bevel (conical) heads. See bolt, internal wrenching. Excludes:screw, shoulder; and screw, machine.

flat chamfer head style, right-hand thread direction, 1.377 inches minimum and 1.500 inches maximum thread length, 1.460 inches minimum and 1.500 inches maximum fastener length, 3a 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: 3a
Thread Direction: right-hand
Thread Length: 1.377 inches minimum and 1.500 inches maximum
Fastener Length: 1.460 inches minimum and 1.500 inches maximum
Head Style: flat chamfer
Head Diameter: 0.550 inches minimum and 0.562 inches maximum
Head Height: 0.368 inches minimum and 0.375 inches maximum
Locking Feature: patch or strip threads
Internal Drive Style: hexagon
Nominal Thread Diameter: 0.375 inches
Width Across Flats: 0.312 inches minimum and 0.316 inches maximum
Thread Quantity Per Inch: 24
Minimum Tensile Strength: 170000 pounds per square inch
Hardness Rating: 38.0 rockwell c minimum and 45.0 rockwell c maximum overall
Minimum Yield Strength: 150000 pounds per square inch
Surface Finish: 32.0 microinches threads
Surface Finish: 63.0 microinches bearing surface of head
Surface Finish: 63.0 microinches grip
Material: steel overall
Surface Treatment: cadmium and chromate overall
Surface Treatment Document And Classification: qq-p-416 type 2 class 3 fed spec single treatment response overall
Thread Series Designator: unf
Nondefinitive Spec/Std Data: 6 type

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
MS16998-76L	Socket Head Cap Screw
NAS1351-6LB24P	Socket Head Cap Screw

FAQs

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

What is the FSCG of the NSN 5305-01-236-1621?

The FSCG of the NSN 5305-01-236-1621 is 5305

Does the NSN 5305-01-236-1621 have a Schedule B code assigned?

Yes, the Schedule B code is 7318152000

Does NSN 5305-01-236-1621 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 5305-01-236-1621 contain precious materials?

Item does not contain precious metal.

Does NSN 5305-01-236-1621 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 5305-01-236-1621 was assigned to the Federal Catalog?

It was assigned 40 years ago, on Mon, Jul 14, 1986