137999
View detailed technical data, stock status, and sourcing information for: 137999
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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.
0.188 inches minimum thread length, flat countersunk head style, right-hand thread direction, 3a thread class, 0.250 inches nominal fastener length
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
- 0.188 inches minimum
- Fastener Length
- 0.250 inches nominal
- Head Style
- flat countersunk
- Head Diameter
- 0.188 inches nominal
- Internal Drive Style
- slot
- Nominal Thread Diameter
- 0.099 inches
- Features Provided
- casehardened
- Thread Quantity Per Inch
- 56
- Countersink Angle
- 82.0 degrees nominal
- Part Name Assigned By Controlling Agency
- navy special project
- Screw Material
- steel
- Screw Surface Treatment
- zinc
- 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Below is a list of NSNs that have been officially superseded by this NSN: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 |
|---|---|---|
| 5305-00-392-0856 | No Name Available | 01/01/1960 |
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 |
|---|---|
| 137999 | Machine Screw |
FAQs
Find helpful answers about installation, operation, maintenance, compliance, and troubleshooting.
What is the FSCG of the NSN 5305-00-286-8948?
Does the NSN 5305-00-286-8948 have a Schedule B code assigned?
Does NSN 5305-00-286-8948 require demilitarization?
Does NSN 5305-00-286-8948 contain precious materials?
Does NSN 5305-00-286-8948 contain hazardous materials?
When the NSN 5305-00-286-8948 was assigned to the Federal Catalog?
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