N-256-1/4 ROUND HEAD
View detailed technical data, stock status, and sourcing information for: N-256-1/4 ROUND HEAD
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An externally threaded fastener whose threaded portion is of one nominal diameter, no 0 (0.060 in./1.5 mm) or larger, designed to be held or driven with either a wrench or an inserted driver or both (excluding internal socket or internal multiple spline types), in sizes below no. 10 (0.190 in./5 mm). No. 10 and larger sizes must have a head designed for any type inserted driver (excluding internal socket or internal multiple spline types), but may also be designed for external wrenching. A locking feature may be incorporated in the design of the head or threads. Excludes:bolt, clevis; bolt, externally relieved body; screw, externally relieved body; and screw, assembled washer. See also, screw, instrument; bolt, machine; bolt, internal wrenching; and screw, cap socket head.
right-hand thread direction, 0.250 inches nominal fastener length, 0.250 inches maximum thread length, 2a thread class, round head style
Product Characteristics
Below you’ll find the complete technical specifications and performance data for this part, including material details and compliance information.
- Thread Class
- 2a
- Thread Direction
- right-hand
- Thread Length
- 0.250 inches maximum
- Fastener Length
- 0.250 inches nominal
- Head Style
- round
- Head Diameter
- 0.162 inches nominal
- Head Height
- 0.067 inches nominal
- Internal Drive Style
- slot
- Nominal Thread Diameter
- 0.086 inches
- Thread Quantity Per Inch
- 56
- Screw Material
- plastic polyamide (nylon)
- Thread Series Designator
- unc
Replaces National Stock Numbers
Below is a list of NSNs that have been officially superseded by this NSN:
| NSN | Name | Date |
|---|---|---|
| 5305-00-854-0471 | No Name Available | 10/01/1975 |
| 5305-01-116-4803 | No Name Available | 09/01/1986 |
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 |
|---|---|
| 70-106509-1208 | Machine Screw |
| N-256-1/4 ROUND HEAD | Machine Screw |
| PC91006-3 | Machine Screw |
| RHNY-003-9 | Machine Screw |
| RHNY-003NA | Machine Screw |
FAQs
Find helpful answers about installation, operation, maintenance, compliance, and troubleshooting.
What is the FSCG of the NSN 5305-00-064-4224?
Does the NSN 5305-00-064-4224 have a Schedule B code assigned?
Does NSN 5305-00-064-4224 require demilitarization?
Does NSN 5305-00-064-4224 contain precious materials?
Does NSN 5305-00-064-4224 contain hazardous materials?
When the NSN 5305-00-064-4224 was assigned to the Federal Catalog?
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