HR257-5-20L

View detailed technical data, stock status, and sourcing information for: HR257-5-20L
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Federal Supply Group

Hardware and Abrasives

Federal Supply Classification

5305 Screws

National Stock Number

5305-01-458-4851

Item Name Code

29294

Assigment Date

08/28/1998 (27 years ago)

A component within a single inclosure or provided with a single mounting specifically designed to control automatically the voltage output of an electrical system within certain required limits, regardless of variations of the effective load or of input voltages within a specific range. Does not include items in which regulation is accomplished solely by transformer action. See also regulator set,voltage. Excludes:regulator,engine generator.

0.532 inches minimum and 0.582 inches maximum thread length, right-hand thread direction, 3a thread class, flat countersunk head style, 1.817 inches minimum and 1.847 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: 3a
Thread Direction: right-hand
Thread Length: 0.532 inches minimum and 0.582 inches maximum
Fastener Length: 1.817 inches minimum and 1.847 inches maximum
Head Style: flat countersunk
Head Diameter: 0.573 inches minimum and 0.630 inches maximum
Grip Diameter: 0.311 inches minimum and 0.312 inches maximum
Internal Drive Style: offset cruciform (torque set)
Nominal Thread Diameter: 0.312 inches
Grip Length: 1.240 inches minimum and 1.260 inches maximum
Thread Quantity Per Inch: 24
Minimum Tensile Strength: 132000 pounds per square inch
Countersink Angle: 99.0 degrees minimum and 101.0 degrees maximum
Special Features: dry film lube-threads only
Material: cobalt comp mp-35-n overall
Material Document And Classification: smd 584 national spec 15th material response overall
Surface Treatment: passivate overall
Surface Treatment Document And Classification: qq-p-35 fed spec single treatment 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
03A415-5-20L	Close Tolerance Screw
125300-5-20L	Close Tolerance Screw
HR257-5-20L	Close Tolerance Screw
PBF1570-5-20L	Close Tolerance Screw

FAQs

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

What is the FSCG of the NSN 5305-01-458-4851?

The FSCG of the NSN 5305-01-458-4851 is 5305

Does the NSN 5305-01-458-4851 have a Schedule B code assigned?

Yes, the Schedule B code is 8105900000

Does NSN 5305-01-458-4851 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 5305-01-458-4851 contain precious materials?

Item does not contain precious metal.

Does NSN 5305-01-458-4851 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 5305-01-458-4851 was assigned to the Federal Catalog?

It was assigned 27 years ago, on Fri, Aug 28, 1998