21 FK-420
View detailed technical data, stock status, and sourcing information for: 21 FK-420
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A nut with a flanged base of varied shapes which may be plain or mounted by rivets, bolts, welding or integral prongs. An integral feature is incorporated for locking on the threads of a mating member.
prevailing torque all metal design locking feature, soluble lubricant lubrication, right-hand thread direction, hexagon nut style, 2b 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
- 2b
- Thread Direction
- right-hand
- Locking Feature
- prevailing torque all metal design
- Lubrication
- soluble lubricant
- Nut Style
- hexagon
- Nut Height
- 0.219 inches maximum
- Width Across Flats
- 0.430 inches minimum and 0.439 inches maximum
- Thread Series
- unc
- Thread Quantity Per Inch
- 20
- Nominal Thread Size
- 0.250 inches
- Bearing Surface Type
- chamfered
- Material
- steel overall
- Surface Treatment
- cadmium overall
Replaces National Stock Numbers
Below is a list of NSNs that have been officially superseded by this NSN:
| NSN | Name | Date |
|---|---|---|
| 5310-01-341-2897 | No Name Available | 03/01/2001 |
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 |
|---|---|
| 21 FK-420 | Hexagon Self-Locking Nut |
| 29725-034 | Hexagon Self-Locking Nut |
| 54230-11#44 | Hexagon Self-Locking Nut |
| 54267-01 | Hexagon Self-Locking Nut |
FAQs
Find helpful answers about installation, operation, maintenance, compliance, and troubleshooting.
What is the FSCG of the NSN 5310-01-132-6522?
Does the NSN 5310-01-132-6522 have a Schedule B code assigned?
Does NSN 5310-01-132-6522 require demilitarization?
Does NSN 5310-01-132-6522 contain precious materials?
Does NSN 5310-01-132-6522 contain hazardous materials?
When the NSN 5310-01-132-6522 was assigned to the Federal Catalog?
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Pricing
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