M19-20873 PC NO 257
View detailed technical data, stock status, and sourcing information for: M19-20873 PC NO 257
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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, pan head style, 0.250 inches nominal thread length, 2a 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
- 2a
- Thread Direction
- right-hand
- Thread Length
- 0.250 inches nominal
- Fastener Length
- 0.250 inches nominal
- Head Style
- pan
- Head Diameter
- 0.205 inches minimum and 0.219 inches maximum
- Head Height
- 0.058 inches minimum and 0.068 inches maximum
- Internal Drive Style
- slot
- Nominal Thread Diameter
- 0.112 inches
- Thread Quantity Per Inch
- 40
- Minimum Tensile Strength
- 60000 pounds per square inch
- Screw Material
- steel or steel corrosion resisting or aluminum alloy or copper alloy 110
- Screw Material Document And Classification
- ansib18.6.3 assn std 1st material response
- Thread Series Designator
- unf
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 |
|---|---|
| 306-02040 | Machine Screw |
| 310-02040 | Machine Screw |
| 310-02040-0 | Machine Screw |
| M19-20873 PC NO 257 | Machine Screw |
| M19-21121-D PC142 | Machine Screw |
| PL-M19-21121-D PC 142 | Machine Screw |
FAQs
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