51B220-3

View detailed technical data, stock status, and sourcing information for: 51B220-3
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Federal Supply Group

Hardware and Abrasives

Federal Supply Classification

5305 Screws

National Stock Number

5305-00-026-2883

Item Name Code

29294

Assigment Date

10/17/1972 (53 years ago)

A screw, machine or screw, cap, socket head whose unthreaded portion is of specified grip length, plated or unplated, and is machined to a tolerance of one thousandth (0.001 in.) (0.025 mm) or less of a specific diameter for items (1.000 in.) (25 mm) or less in diameter. Items over (1.000 in.) (25 mm) in diameter shall have a tolerance of fifteen ten thousandths (0.0015 in.) (0.038 mm) or less. The nominal major diameter of the threads shall be at least one thousandth (0.001 in.) (0.025 mm) below the minimum shank diameter, but not below the minimum major diameter for applicable class of fit, as shown in the screw thread standards, fed std h28 and/or other nationally recognized standards. The head is designed to be held or driven with an inserted driver. It is not designed for rotation by the thumb and fingers. A locking feature may be incorporated in the design of the head or threads.

0.276 inches minimum thread length, pan head style, 3a thread class, right-hand thread direction, 0.448 inches minimum and 0.495 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: 0.276 inches minimum
Fastener Length: 0.448 inches minimum and 0.495 inches maximum
Head Style: pan
Head Diameter: 0.328 inches nominal
Head Height: 0.088 inches minimum and 0.102 inches maximum
Grip Diameter: 0.1620 inches minimum and 0.1630 inches maximum
Internal Drive Style: offset cruciform (torque set)
Nominal Thread Diameter: 0.164 inches
Grip Length: 0.172 inches minimum and 0.202 inches maximum
Thread Quantity Per Inch: 32
Minimum Tensile Strength: 180000 pounds per square inch
Material: steel comp 4340 or steel comp 4140 or steel comp 8740 overall
Surface Treatment: cadmium and chromate overall
Surface Treatment Document And Classification: qq-p-416,type 2 class 2 fed spec single treatment response overall
Thread Series Designator: unjc

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
51B220-3	Close Tolerance Screw

FAQs

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

What is the FSCG of the NSN 5305-00-026-2883?

The FSCG of the NSN 5305-00-026-2883 is 5305

Does the NSN 5305-00-026-2883 have a Schedule B code assigned?

Yes, the Schedule B code is 7318152000

Does NSN 5305-00-026-2883 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 5305-00-026-2883 contain precious materials?

Precious metal content is unknown

Does NSN 5305-00-026-2883 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 5305-00-026-2883 was assigned to the Federal Catalog?

It was assigned 53 years ago, on Tue, Oct 17, 1972