BACB30LH4U3

View detailed technical data, stock status, and sourcing information for: BACB30LH4U3
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Federal Supply Group

Hardware and Abrasives

Federal Supply Classification

5305 Screws

National Stock Number

5305-01-059-3589

Item Name Code

29294

Assigment Date

04/10/1978 (48 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.

3a thread class, 0.364 inches minimum and 0.414 inches maximum thread length, flat countersunk head style, right-hand thread direction, 0.562 inches minimum and 0.592 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: 0.364 inches minimum and 0.414 inches maximum
Fastener Length: 0.562 inches minimum and 0.592 inches maximum
Head Style: flat countersunk
Head Diameter: 0.455 inches minimum and 0.510 inches maximum
Grip Diameter: 0.2490 inches minimum and 0.2495 inches maximum
Internal Drive Style: cross recess type 1
Nominal Thread Diameter: 0.250 inches
Grip Length: 0.178 inches minimum and 0.198 inches maximum
Thread Quantity Per Inch: 28
Countersink Angle: 100.0 degrees nominal
Surface Finish: 32.0 microinches grip
Surface Finish: 32.0 microinches threads
Material: iron alloy 660 overall
Surface Treatment: passivate overall
Thread Series Designator: unjf
Specification/Standard Data: 81205-bacb30lh manufacturers 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
BACB30LH4U3	Close Tolerance Screw

FAQs

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

What is the FSCG of the NSN 5305-01-059-3589?

The FSCG of the NSN 5305-01-059-3589 is 5305

Does the NSN 5305-01-059-3589 have a Schedule B code assigned?

Yes, the Schedule B code is 7318152000

Does NSN 5305-01-059-3589 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 5305-01-059-3589 contain precious materials?

Precious metal content is unknown

Does NSN 5305-01-059-3589 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 5305-01-059-3589 was assigned to the Federal Catalog?

It was assigned 48 years ago, on Mon, Apr 10, 1978