HT4020-7-18X

View detailed technical data, stock status, and sourcing information for: HT4020-7-18X
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Federal Supply Group

Hardware and Abrasives

Federal Supply Classification

5305 Screws

National Stock Number

5305-01-267-6921

Item Name Code

22846

Assigment Date

11/17/1987 (38 years ago)

An externally threaded fastener whose threaded portion is of one nominal diameter, no 0 (0.060 in.) (1.5 mm) or larger. It has a round unthreaded neck or shank all or part of which is of greater diameter than the threaded portion. The head is designed to be driven with either a wrench or an inserted driver or both in sizes below no. 10 (0.190 in.) (5 mm) nominal diameter. No. 10 (0.190 in.) (5 mm) and larger sizes must be designed for any type of inserted driver, but may also provide for external wrenching of the head. A locking feature may be incorporated in the design of the head or threads. For items which are both shouldered and have an externally relieved body, use screw, externally relieved body. For items with a no. 10 (0.190 in.) (5 mm) or larger thread diameter without an inserted driver head, use bolt, shoulder. Excludes:bolt, internal wrenching and screw, cap, socket head.

0.656 inches nominal thread length, 3a thread class, flat countersunk undercut head style, 1.765 inches minimum and 1.812 inches maximum fastener length, right-hand thread direction

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: 0.656 inches nominal
Fastener Length: 1.765 inches minimum and 1.812 inches maximum
Head Style: flat countersunk undercut
Head Diameter: 0.810 inches minimum and 0.889 inches maximum
Head Height: 0.124 inches minimum and 0.127 inches maximum
Shoulder Diameter: 0.452 inches minimum and 0.453 inches maximum first shoulder
Shoulder Length: 0.998 inches minimum and 1.001 inches maximum first shoulder
Internal Drive Style: high-torque
Nominal Thread Diameter: 0.438 inches
Thread Quantity Per Inch: 20
Countersink Angle: 99.0 degrees minimum and 101.0 degrees maximum
Shoulder Shape: round first shoulder
Material: steel comp xm-13 overall
Material Document And Classification: ams5629 assn std single material 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
HT4020-7-18X	Shoulder Screw

FAQs

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

What is the FSCG of the NSN 5305-01-267-6921?

The FSCG of the NSN 5305-01-267-6921 is 5305

Does the NSN 5305-01-267-6921 have a Schedule B code assigned?

Yes, the Schedule B code is 7318152000

Does NSN 5305-01-267-6921 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 5305-01-267-6921 contain precious materials?

Precious metal content is unknown

Does NSN 5305-01-267-6921 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 5305-01-267-6921 was assigned to the Federal Catalog?

It was assigned 38 years ago, on Tue, Nov 17, 1987