18243
View detailed technical data, stock status, and sourcing information for: 18243
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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.
2a thread class, 0.136 inches minimum and 0.229 inches maximum thread length, right-hand thread direction, 0.281 inches minimum and 0.312 inches maximum fastener length, flat countersunk 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
- 0.136 inches minimum and 0.229 inches maximum
- Fastener Length
- 0.281 inches minimum and 0.312 inches maximum
- Head Style
- flat countersunk
- Head Diameter
- 0.244 inches minimum and 0.279 inches maximum
- Internal Drive Style
- cross recess type 1
- End Item Identification
- w/s:radar set, firefinder (an/tpq-36); trainer, b-1b aircraft; engine, aircraft, tf-33-p-7 (c-141a/b); close in weapon system (ciws-phalanx); helicopter, mh-53e; aircraft (ac-130h, mc-130h, ec-130e, hc-130); armored security vehicle, model xm1117; missile, air intercept, sidewinder (aim-9); air compressors, high pressure
- Nominal Thread Diameter
- 0.138 inches
- Thread Quantity Per Inch
- 32
- Minimum Tensile Strength
- 60000 pounds per square inch
- Countersink Angle
- 80.0 degrees minimum and 82.0 degrees maximum
- Screw Material
- steel
- Screw Material Document And Classification
- qq-s-634 fed spec single material response or qq-s-637 fed spec single material response or 66 fed std single material response
- Screw Surface Treatment
- cadmium and chromate
- Screw Surface Treatment Document And Classification
- qq-p-416 ty 2 cl 3 fed spec all treatment responses
- Thread Series Designator
- unc
- Nondefinitive Spec/Std Data
- 3 type and 2c style
Replaces National Stock Numbers
Below is a list of NSNs that have been officially superseded by this NSN:
| NSN | Name | Date |
|---|---|---|
| 5305-00-059-4914 | No Name Available | 07/03/1968 |
| 5305-00-083-9721 | No Name Available | 09/01/1982 |
| 5305-00-088-9159 | No Name Available | 01/01/1963 |
| 5305-00-754-4343 | No Name Available | 08/01/1989 |
| 5305-00-951-8850 | No Name Available | 02/20/1967 |
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 |
|---|---|
| 092645K2 | Machine Screw |
| 1026-14-171 | Machine Screw |
| 125-10491-84 | Machine Screw |
| 18243 | Machine Screw |
| 18243ADX | Machine Screw |
| 5305000594550 | Machine Screw |
| 855220 | Machine Screw |
| 859085-00 | Machine Screw |
| MS35188-24 | Machine Screw |
| MS35190-235 | Machine Screw |
| MS35190-24 | Machine Screw |
| MS35192-24 | Machine Screw |
| MS35194-24 | Machine Screw |
| MS35243-34 | Machine Screw |
FAQs
Find helpful answers about installation, operation, maintenance, compliance, and troubleshooting.
What is the FSCG of the NSN 5305-00-059-4550?
Does the NSN 5305-00-059-4550 have a Schedule B code assigned?
Does NSN 5305-00-059-4550 require demilitarization?
Does NSN 5305-00-059-4550 contain precious materials?
Does NSN 5305-00-059-4550 contain hazardous materials?
When the NSN 5305-00-059-4550 was assigned to the Federal Catalog?
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