76121-4-3
View detailed technical data, stock status, and sourcing information for: 76121-4-3
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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.
0.076 inches minimum and 0.086 inches maximum first hole shank unthreaded hole diameter, 0.2490 inches minimum and 0.2495 inches maximum grip diameter, 3a thread class, 0.350 inches minimum and 0.398 inches maximum head diameter, high-torque internal drive 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
- 3a
- Head Diameter
- 0.350 inches minimum and 0.398 inches maximum
- Grip Diameter
- 0.2490 inches minimum and 0.2495 inches maximum
- Shank Unthreaded Hole Diameter
- 0.076 inches minimum and 0.086 inches maximum first hole
- Internal Drive Style
- high-torque
- Nominal Thread Diameter
- 0.250 inches
- Grip Length
- 0.178 inches minimum and 0.198 inches maximum
- Thread Quantity Per Inch
- 28
- Minimum Tensile Strength
- 160000 pounds per square inch
- Hardness Rating
- 36.0 rockwell c minimum and 40.0 rockwell c maximum overall
- Countersink Angle
- 100.0 degrees nominal
- Distance From Head Largest Bearing Surface To Shank Hole Center
- 0.090 inches minimum and 0.110 inches maximum first hole
- Surface Finish
- 32.0 microinches grip
- Surface Finish
- 32.0 microinches threads
- Part Name Assigned By Controlling Agency
- navy special project
- Material
- iron alloy 660 overall
- Material Document And Classification
- ams 5732 assn std single material response overall
- Surface Treatment
- passivate overall
- Surface Treatment Document And Classification
- qq-p-35 fed spec single treatment response overall
- Thread Series Designator
- unjf
- Specification/Standard Data
- 26512-gb510b manufacturers standard
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 |
|---|---|
| 76121-4-3 | Close Tolerance Screw |
| BM19047C4H3 | Close Tolerance Screw |
| GB510BF4-3 | Close Tolerance Screw |
FAQs
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What is the FSCG of the NSN 5305-01-043-7715?
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Does NSN 5305-01-043-7715 require demilitarization?
Does NSN 5305-01-043-7715 contain precious materials?
Does NSN 5305-01-043-7715 contain hazardous materials?
When the NSN 5305-01-043-7715 was assigned to the Federal Catalog?
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