BACB30NT4K20
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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.
pan head style, 3a thread class, right-hand thread direction, 0.389 inches nominal thread length, 1.639 inches nominal 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
- 0.389 inches nominal
- Fastener Length
- 1.639 inches nominal
- Head Style
- pan
- Head Diameter
- 0.473 inches minimum and 0.492 inches maximum
- Head Height
- 0.162 inches minimum and 0.175 inches maximum
- Grip Diameter
- 0.2481 inches minimum and 0.2495 inches maximum
- Internal Drive Style
- cross recess type 1
- Nominal Thread Diameter
- 0.250 inches
- Grip Length
- 1.240 inches minimum and 1.260 inches maximum
- Thread Quantity Per Inch
- 28
- Surface Finish
- 32.0 microinches bearing surface of head
- Surface Finish
- 32.0 microinches grip
- Surface Finish
- 32.0 microinches threads
- Part Name Assigned By Controlling Agency
- bolt, pan head, cross recess, short thread
- Material
- titanium alloy uns r56400 overall
- Material Document And Classification
- ams 4928 assn std single material response or ams 4967 assn std single material response overall
- Surface Treatment
- aluminum overall
- Surface Treatment Document And Classification
- bms 10-85, type 1 assn std 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 |
|---|---|
| BACB30NT4K20 | Close Tolerance Screw |
FAQs
Find helpful answers about installation, operation, maintenance, compliance, and troubleshooting.
What is the FSCG of the NSN 5305-01-580-9523?
Does the NSN 5305-01-580-9523 have a Schedule B code assigned?
Does NSN 5305-01-580-9523 require demilitarization?
Does NSN 5305-01-580-9523 contain precious materials?
Does NSN 5305-01-580-9523 contain hazardous materials?
When the NSN 5305-01-580-9523 was assigned to the Federal Catalog?
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