AN178C27A
View detailed technical data, stock status, and sourcing information for: AN178C27A
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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.
right-hand thread direction, hexagon head style, 2.953 inches minimum and 2.999 inches maximum fastener length, 0.781 inches nominal thread length, 3a thread class
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
- 0.781 inches nominal
- Fastener Length
- 2.953 inches minimum and 2.999 inches maximum
- Head Style
- hexagon
- Head Height
- 0.265 inches minimum and 0.297 inches maximum
- Width Between Flats
- 0.740 inches minimum and 0.752 inches maximum
- Grip Diameter
- 0.4986 inches minimum and 0.4991 inches maximum
- Internal Drive Style
- cross recess type 1
- Nominal Thread Diameter
- 0.500 inches
- Grip Length
- 2.187 inches minimum and 2.202 inches maximum
- Thread Quantity Per Inch
- 20
- Minimum Tensile Strength
- 125000 pounds per square inch
- Hardness Rating
- 26.0 rockwell c minimum and 32.0 rockwell c maximum overall
- Surface Finish
- 32.0 microinches bearing surface of head32.0 microinches grip
- Material
- steel comp 431 overall
- Material Document And Classification
- mil-s-18732 mil spec single material response overall
- Surface Treatment
- passivate overall
- Thread Series Designator
- unf
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 |
|---|---|
| AN178C27A | Close Tolerance Screw |
FAQs
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What is the FSCG of the NSN 5305-01-348-2684?
Does the NSN 5305-01-348-2684 have a Schedule B code assigned?
Does NSN 5305-01-348-2684 require demilitarization?
Does NSN 5305-01-348-2684 contain precious materials?
Does NSN 5305-01-348-2684 contain hazardous materials?
When the NSN 5305-01-348-2684 was assigned to the Federal Catalog?
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