B1990-7-4

View detailed technical data, stock status, and sourcing information for: B1990-7-4
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Federal Supply Group

Hardware and Abrasives

Federal Supply Classification

5305 Screws

National Stock Number

5305-00-250-2144

Item Name Code

22846

Assigment Date

03/03/1969 (57 years ago)

0.891 inches minimum and 0.921 inches maximum fastener length, flat countersunk head style, 0.291 inches minimum and 0.351 inches maximum thread length, right-hand thread direction, 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: 0.291 inches minimum and 0.351 inches maximum
Fastener Length: 0.891 inches minimum and 0.921 inches maximum
Head Style: flat countersunk
Head Diameter: 0.276 inches nominal
Shoulder Diameter: 0.193 inches minimum and 0.195 inches maximum first shoulder
Shoulder Length: 0.530 inches minimum and 0.560 inches maximum first shoulder
Internal Drive Style: slot
Nominal Thread Diameter: 0.190 inches
Thread Quantity Per Inch: 32
Countersink Angle: 100.0 degrees nominal
Shoulder Shape: round first shoulder
Special Features: top of head red
Material: steel comp 4037 or steel comp 8740 overall
Surface Treatment: cadmium and chromate overall
Surface Treatment: paint top of head
Surface Treatment Document And Classification: qq-p-416,ty 2,cl 3 fed spec single treatment response overall
Thread Series Designator: unf

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
AIC551C3-647	Shoulder Screw
B1990-7-4	Shoulder Screw
BM19069-3-647	Shoulder Screw
GS551C3-647	Shoulder Screw
HP6551C3-647	Shoulder Screw
PBF1285-3-647	Shoulder Screw
PIL551C3-647	Shoulder Screw
S100C3-647	Shoulder Screw

FAQs

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

What is the FSCG of the NSN 5305-00-250-2144?

The FSCG of the NSN 5305-00-250-2144 is 5305

Does the NSN 5305-00-250-2144 have a Schedule B code assigned?

Yes, the Schedule B code is 7318152000

Does NSN 5305-00-250-2144 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 5305-00-250-2144 contain precious materials?

Precious metal content is unknown

Does NSN 5305-00-250-2144 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 5305-00-250-2144 was assigned to the Federal Catalog?

It was assigned 57 years ago, on Mon, Mar 3, 1969