991-D568-418L

View detailed technical data, stock status, and sourcing information for: 991-D568-418L
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Federal Supply Group

Hardware and Abrasives

Federal Supply Classification

5305 Screws

National Stock Number

5305-01-364-4540

Item Name Code

06657

Assigment Date

09/19/1992 (33 years ago)

An externally threaded fastener whose threaded portion is of one nominal diameter, no 0 (0.060 in./1.5 mm) or larger, designed to be held or driven with either a wrench or an inserted driver or both (excluding internal socket or internal multiple spline types), in sizes below no. 10 (0.190 in./5 mm). No. 10 and larger sizes must have a head designed for any type inserted driver (excluding internal socket or internal multiple spline types), but may also be designed for external wrenching. A locking feature may be incorporated in the design of the head or threads. Excludes:bolt, clevis; bolt, externally relieved body; screw, externally relieved body; and screw, assembled washer. See also, screw, instrument; bolt, machine; bolt, internal wrenching; and screw, cap socket head.

right-hand thread direction, 2a thread class, 0.415 inches minimum and 0.495 inches maximum thread length, flat countersunk head style, 0.532 inches minimum and 0.562 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: 0.415 inches minimum and 0.495 inches maximum
Fastener Length: 0.532 inches minimum and 0.562 inches maximum
Head Style: flat countersunk
Head Diameter: 0.195 inches minimum and 0.225 inches maximum
Internal Drive Style: slot
Nominal Thread Diameter: 0.112 inches
Thread Quantity Per Inch: 40
Countersink Angle: 80.0 degrees minimum and 82.0 degrees maximum
Part Name Assigned By Controlling Agency: navy special project
Screw Material: steel comp 302 or steel comp 302b or steel comp 303 or steel comp 303 plus x or steel comp 303se or steel comp 303cu or steel comp 303ma or steel comp 304 or steel comp 304l
Screw Surface Treatment: passivate
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
991-D568-418L	Machine Screw

FAQs

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

What is the FSCG of the NSN 5305-01-364-4540?

The FSCG of the NSN 5305-01-364-4540 is 5305

Does the NSN 5305-01-364-4540 have a Schedule B code assigned?

Yes, the Schedule B code is 7318152000

Does NSN 5305-01-364-4540 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 5305-01-364-4540 contain precious materials?

Item does not contain precious metal.

Does NSN 5305-01-364-4540 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 5305-01-364-4540 was assigned to the Federal Catalog?

It was assigned 33 years ago, on Sat, Sep 19, 1992