441B1
View detailed technical data, stock status, and sourcing information for: 441B1
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A tubular shaped item with a round or hexagon peripheral shape having two flat bearing surfaces perpendicular to the axis of the centrally located hole. It is designed to maintain a predetermined distance between assembled parts. The item may be with or without flange(s) of any peripheral shape. The overall length must exceed 25 percent of the outside diameter or distance across peripheral flats of the body. (when the length, outside diameter, and/or distance across peripheral flats are designed as a tolerance, the maximum dimension will be used to determine compliance). For items having other than a round or hexagon peripheral shape, see spacer, plate. Excludes:items with lubricating features, see bearing, sleeve and bushing, sleeve. See also bushing, tapered; spacer, ring; washer, flat; and washer, (as modified).
28 counterbore threads per inch, 3.750 inches nominal fastener length, 0.625 inches minimum thread length, 2a thread class, right-hand thread direction
Product Characteristics
Below you’ll find the complete technical specifications and performance data for this part, including material details and compliance information.
- Threads Per Inch
- 28 counterbore
- Thread Class
- 2a
- Thread Direction
- right-hand
- Thread Length
- 0.625 inches minimum
- Fastener Length
- 3.750 inches nominal
- Head Style
- hexagon
- Head Height
- 0.375 inches nominal
- Width Between Flats
- 1.500 inches nominal
- Shank Unthreaded Hole Diameter
- 0.140 inches nominal first hole
- Concentric Hole Depth
- 1.938 inches nominal
- Counterbore Diameter
- 0.750 inches nominal
- Counterbore Depth
- 0.375 inches nominal
- Concentric Hole Diameter
- 0.219 inches nominal
- Internal Thread Length
- 0.375 inches nominal counterbore
- Nominal Thread Diameter
- 1.000 inches
- Thread Series
- unf counterbore
- Internal Thread Direction
- right-hand counterbore
- Thread Quantity Per Inch
- 14
- Hardness Rating
- 37.0 rockwell c minimum overall
- Nominal Thread Size
- 0.250 inches counterbore
- Distance From Head Largest Bearing Surface To Shank Hole Center
- 3.531 inches nominal first hole
- Internal Thread Class
- 2b concentric hole
- Material
- steel comp 8640 or steel comp 8740 overall
- Surface Treatment
- cadmium overall
- Thread Series Designator
- unf
Replaces National Stock Numbers
Below is a list of NSNs that have been officially superseded by this NSN:
| NSN | Name | Date |
|---|---|---|
| 5306-00-328-4264 | No Name Available | 01/01/1963 |
| 5306-00-829-4992 | No Name Available | 11/14/1969 |
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:
FAQs
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What is the FSCG of the NSN 5306-00-693-0635?
Does the NSN 5306-00-693-0635 have a Schedule B code assigned?
Does NSN 5306-00-693-0635 require demilitarization?
Does NSN 5306-00-693-0635 contain precious materials?
Does NSN 5306-00-693-0635 contain hazardous materials?
When the NSN 5306-00-693-0635 was assigned to the Federal Catalog?
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