MS21125B420
View detailed technical data, stock status, and sourcing information for: MS21125B420
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A screw, machine or screw, cap, socket head whose unthreaded portion is of specified grip length, plated or unplated, and is machined to a tolerance of one thousandth (0.001 in.) (0.025 mm) or less of a specific diameter for items (1.000 in.) (25 mm) or less in diameter. Items over (1.000 in.) (25 mm) in diameter shall have a tolerance of fifteen ten thousandths (0.0015 in.) (0.038 mm) or less. The nominal major diameter of the threads shall be at least one thousandth (0.001 in.) (0.025 mm) below the minimum shank diameter, but not below the minimum major diameter for applicable class of fit, as shown in the screw thread standards, fed std h28 and/or other nationally recognized standards. The head is designed to be held or driven with an inserted driver. It is not designed for rotation by the thumb and fingers. A locking feature may be incorporated in the design of the head or threads.
flat chamfer head style, right-hand thread direction, 1.668 inches minimum and 1.688 inches maximum fastener length, 0.277 inches minimum and 0.328 inches maximum thread length, 3a thread class
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
- 0.277 inches minimum and 0.328 inches maximum
- Fastener Length
- 1.668 inches minimum and 1.688 inches maximum
- Head Style
- flat chamfer
- Head Diameter
- 0.477 inches minimum and 0.492 inches maximum
- Head Height
- 0.126 inches minimum and 0.141 inches maximum
- Locking Feature
- detent ball grip
- Grip Diameter
- 0.2487 inches minimum and 0.2492 inches maximum
- Shank Unthreaded Hole Diameter
- 0.076 inches minimum and 0.086 inches maximum first hole
- Internal Drive Style
- slot
- Nominal Thread Diameter
- 0.250 inches
- Grip Length
- 1.250 inches minimum and 1.266 inches maximum
- Thread Quantity Per Inch
- 28
- Minimum Tensile Strength
- 63000 pounds per square inch
- Distance From Head Largest Bearing Surface To Shank Hole Center
- 1.573 inches minimum and 1.593 inches maximum first hole
- Surface Finish
- 32.0 microinches bearing surface of head
- Surface Finish
- 32.0 microinches grip
- Part Name Assigned By Controlling Agency
- navy special project
- Material
- steel comp 631 or steel comp 302 spring
- Material
- steel comp 632 fastener
- Material Document And Classification
- ams5673 assn std 1st material response or astm a580 assn std 2nd material response spring
- Surface Treatment
- passivate overall
- Surface Treatment Document And Classification
- qq-p-35 fed spec single treatment response overall
- Thread Series Designator
- unjf
Replaces National Stock Numbers
Below is a list of NSNs that have been officially superseded by this NSN:
| NSN | Name | Date |
|---|---|---|
| 5305-00-093-6682 | No Name Available | 10/01/1988 |
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 |
|---|---|
| MS21125B420 | Close Tolerance Screw |
FAQs
Find helpful answers about installation, operation, maintenance, compliance, and troubleshooting.
What is the FSCG of the NSN 5305-01-197-3985?
Does the NSN 5305-01-197-3985 have a Schedule B code assigned?
Does NSN 5305-01-197-3985 require demilitarization?
Does NSN 5305-01-197-3985 contain precious materials?
Does NSN 5305-01-197-3985 contain hazardous materials?
When the NSN 5305-01-197-3985 was assigned to the Federal Catalog?
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