NAS1258-50

View detailed technical data, stock status, and sourcing information for: NAS1258-50
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Federal Supply Group

Hardware and Abrasives

Federal Supply Classification

5305 Screws

National Stock Number

5305-01-435-1791

Item Name Code

22846

Assigment Date

08/16/1996 (30 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.

3.565 inches minimum and 3.595 inches maximum fastener length, 3a thread class, flat countersunk head style, right-hand thread direction, 0.453 inches maximum thread 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: 3a
Thread Direction: right-hand
Thread Length: 0.453 inches maximum
Fastener Length: 3.565 inches minimum and 3.595 inches maximum
Head Style: flat countersunk
Head Diameter: 0.951 inches minimum and 1.014 inches maximum
Shoulder Diameter: 0.5297 inches minimum and 0.5307 inches maximum first shoulder
Shoulder Length: 3.115 inches minimum and 3.135 inches maximum first shoulder
Internal Drive Style: high-torque
Nominal Thread Diameter: 0.500 inches
Thread Quantity Per Inch: 20
Minimum Tensile Strength: 160000 pounds per square inch
Countersink Angle: 99.0 degrees minimum and 101.0 degrees maximum
Shoulder Shape: round first shoulder
Material: steel comp 4140 or steel comp 4340 or steel comp 8735 or steel comp 8740 or steel comp 6150 overall
Material Document And Classification: mil-s-5626 mil spec 1st material response or mil-s-5000 mil spec 2nd material response or mil-s-6098 mil spec 3rd material response or mil-s-6049 mil spec 4th material response or mil-s-8503 mil spec 5th material response overall
Surface Treatment: cadmium and chromate overall
Surface Treatment Document And Classification: qq-p-416, type 2, class 2 fed spec all treatment responses overall
Thread Series Designator: unjf
Specification/Standard Data: 80205-nas1258 professional/industrial association standard

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
NAS1258-50	Shoulder Screw

FAQs

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

What is the FSCG of the NSN 5305-01-435-1791?

The FSCG of the NSN 5305-01-435-1791 is 5305

Does the NSN 5305-01-435-1791 have a Schedule B code assigned?

Yes, the Schedule B code is 7318152000

Does NSN 5305-01-435-1791 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 5305-01-435-1791 contain precious materials?

Item does not contain precious metal.

Does NSN 5305-01-435-1791 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 5305-01-435-1791 was assigned to the Federal Catalog?

It was assigned 30 years ago, on Fri, Aug 16, 1996