B1990-8

View detailed technical data, stock status, and sourcing information for: B1990-8
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Federal Supply Group

Hardware and Abrasives

Federal Supply Classification

5305 Screws

National Stock Number

5305-00-508-2718

Item Name Code

22846

Assigment Date

01/01/1963 (63 years ago)

right-hand thread direction, 0.288 inches minimum and 0.348 inches maximum thread length, 0.953 inches minimum and 0.983 inches maximum fastener length, flat countersunk head style, 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: 0.288 inches minimum and 0.348 inches maximum
Fastener Length: 0.953 inches minimum and 0.983 inches maximum
Head Style: flat countersunk
Head Diameter: 0.266 inches minimum and 0.286 inches maximum
Shoulder Diameter: 0.193 inches minimum and 0.195 inches maximum first shoulder
Shoulder Length: 0.595 inches nominal first shoulder
Internal Drive Style: slot
Nominal Thread Diameter: 0.190 inches
Thread Quantity Per Inch: 32
Hardness Rating: 33.0 rockwell c minimum and 37.0 rockwell c maximum overall
Countersink Angle: 100.0 degrees nominal
Shoulder Shape: round first shoulder
Special Features: 2 thds tapered
Material: steel comp 4037 or steel comp 8740 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: 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
A1C551C3-708	Shoulder Screw
AIC551C3-708	Shoulder Screw
B1990-8	Shoulder Screw
BM19069-3-708	Shoulder Screw
GS551C3-708	Shoulder Screw
HP6551C3-708	Shoulder Screw
PBF1285-3-708	Shoulder Screw
PIL551C3-708	Shoulder Screw

FAQs

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

What is the FSCG of the NSN 5305-00-508-2718?

The FSCG of the NSN 5305-00-508-2718 is 5305

Does the NSN 5305-00-508-2718 have a Schedule B code assigned?

Yes, the Schedule B code is 7318152000

Does NSN 5305-00-508-2718 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 5305-00-508-2718 contain precious materials?

Precious metal content is unknown

Does NSN 5305-00-508-2718 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 5305-00-508-2718 was assigned to the Federal Catalog?

It was assigned 63 years ago, on Tue, Jan 1, 1963