51B221-4
View detailed technical data, stock status, and sourcing information for: 51B221-4
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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.
3a thread class, 0.511 inches minimum and 0.558 inches maximum fastener length, right-hand thread direction, modified pan head style, 0.276 inches minimum thread 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
- 0.276 inches minimum
- Fastener Length
- 0.511 inches minimum and 0.558 inches maximum
- Head Style
- modified pan
- Head Diameter
- 0.361 inches minimum and 0.381 inches maximum
- Head Height
- 0.103 inches minimum and 0.118 inches maximum
- Grip Diameter
- 0.1885 inches minimum and 0.1895 inches maximum
- Internal Drive Style
- offset cruciform (torque set)
- Nominal Thread Diameter
- 0.190 inches
- Grip Length
- 0.235 inches minimum and 0.265 inches maximum
- Thread Quantity Per Inch
- 32
- Minimum Tensile Strength
- 80000 pounds per square inch
- Surface Finish
- 32.0 microinches grip
- Material
- steel comp 4140 or steel comp e4340 or steel comp 6150 or steel comp 8735 or steel comp 8740 overall
- Material Document And Classification
- mil-s-5626 mil spec 1st material response or mil-s-5000 mil spec 2nd material response or mil-s-8503 mil spec 3rd material response or mil-s-6098 mil spec 4th material response or mil-s-6049 mil spec 5th material response overall
- Surface Treatment
- cadmium and chromate overall
- Surface Treatment Document And Classification
- qq-p-416,type 2,class 3 fed spec single treatment response overall
- 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 |
|---|---|
| 51B221-4 | Close Tolerance Screw |
FAQs
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What is the FSCG of the NSN 5305-00-802-0574?
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Does NSN 5305-00-802-0574 contain precious materials?
Does NSN 5305-00-802-0574 contain hazardous materials?
When the NSN 5305-00-802-0574 was assigned to the Federal Catalog?
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