C20645B3-7
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An externally threaded fastener designed for insertion through holes in assembled parts and normally intended to be tightened or released by torquing a nut. The threaded and unthreaded portions are both of one nominal diameter of 0.190 inch (5 mm) or larger. The head is not designed to be held or driven with an inserted driver or by the thumb and fingers. A locking feature may be incorporated in the design of the head or threads. Head dimensions and sizes of threaded and unthreaded portions shall conform to internationally recognized fastener standards. For items having a grip length portion machined to a tolerance of 0.0015 inch (0.038 mm) or less, bolt, shear. See also screw, cap, hexagon head and screw, machine.
flat countersunk head style, 0.8005 inches nominal fastener length, 0.363 inches nominal thread length, right-hand thread direction, 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
- 0.363 inches nominal
- Fastener Length
- 0.8005 inches nominal
- Head Style
- flat countersunk
- Head Diameter
- 0.258 inches minimum and 0.305 inches maximum
- Head Height
- 0.049 inches nominal
- Grip Diameter
- 0.1885 inches minimum and 0.1895 inches maximum
- Internal Drive Style
- offset cruciform (torque set)
- End Item Identification
- f16
- Nominal Thread Diameter
- 0.190 inches
- Grip Length
- 0.4375 inches nominal
- Features Provided
- dry film lubricant
- Thread Quantity Per Inch
- 32
- Minimum Tensile Strength
- 2160 pounds per square inch
- Hardness Rating
- 46.0 rockwell c minimum and 50.0 rockwell c maximum overall
- Countersink Angle
- 99.0 degrees minimum and 101.0 degrees maximum
- Material
- steel comp h11 overall
- Material Document And Classification
- ams6487 national std/spec single material response overall
- Surface Treatment
- aluminum and chromate overall
- Surface Treatment Document And Classification
- mil-dtl-83488, type ii, class 3 mil spec 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 |
|---|---|
| 93926B3-7 | Close Tolerance Screw |
| AIC618B3-7 | Close Tolerance Screw |
| C20645B3-7 | Close Tolerance Screw |
| GS1009B3-7 | Close Tolerance Screw |
| SF116B3-7 | Close Tolerance Screw |
| VT10021B3-7 | Close Tolerance Screw |
FAQs
Find helpful answers about installation, operation, maintenance, compliance, and troubleshooting.
What is the FSCG of the NSN 5305-01-693-1721?
Does the NSN 5305-01-693-1721 have a Schedule B code assigned?
Does NSN 5305-01-693-1721 require demilitarization?
Does NSN 5305-01-693-1721 contain precious materials?
Does NSN 5305-01-693-1721 contain hazardous materials?
When the NSN 5305-01-693-1721 was assigned to the Federal Catalog?
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