BM17021Z-4-4A
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A high strength, 160,000 pounds per square inch (1100 megapascals) minimum tensile strength externally threaded fastener designed for use in applications involving great shear stress. The head is designed to accommodate an external wrench or driver. The head is not designed to be held or driven with an inserted driver, nor is it designed for rotation by the thumb and fingers. The unthreaded portion is of specific grip length, plated or unplated, and is machined to a tolerance of one thousandth (0.001) of an inch (0.025 mm) or less of a specific diameter for items one inch (25 mm) or less in diameter. Items over one inch (25 mm) in diameter shall have a tolerance of fifteen ten thousandths (0.0015) of an inch (0.038 mm) or less. The nominal major diameter of the threads shall be at least one thousandth (0.001) of an inch (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. A locking feature may be incorporated in the design of the head or threads. See bolt, machine and bolt, clevis.
right-hand thread direction, 0.267 inches minimum and 0.334 inches maximum thread length, 0.527 inches minimum and 0.574 inches maximum fastener length, double hexagon head style, 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
- 0.267 inches minimum and 0.334 inches maximum
- Fastener Length
- 0.527 inches minimum and 0.574 inches maximum
- Head Style
- double hexagon
- Head Height
- 0.154 inches minimum and 0.174 inches maximum
- Width Between Flats
- 0.430 inches minimum and 0.439 inches maximum
- Grip Diameter
- 0.2483 inches minimum and 0.2492 inches maximum
- Nominal Thread Diameter
- 0.250 inches
- Grip Length
- 0.240 inches minimum and 0.260 inches maximum
- Thread Quantity Per Inch
- 28
- Minimum Tensile Strength
- 260000 pounds per square inch
- Hardness Rating
- 51.0 rockwell c minimum and 54.0 rockwell c maximum overall
- Part Name Assigned By Controlling Agency
- navy special project
- Surface Treatment
- nickel overall
- Thread Series Designator
- unjf
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 |
|---|---|
| AIC516C-4-4 | Shear Bolt |
| BM17021Z-4-4A | Shear Bolt |
| BM17021Z-4A4 | Shear Bolt |
| EWSB26-4A4 | Shear Bolt |
| GB511C4-4 | Shear Bolt |
| H402-4-4 | Shear Bolt |
| VEPS156121-4V4 | Shear Bolt |
| VS3072-4 | Shear Bolt |
FAQs
Find helpful answers about installation, operation, maintenance, compliance, and troubleshooting.
What is the FSCG of the NSN 5306-01-064-5458?
Does NSN 5306-01-064-5458 require demilitarization?
Does NSN 5306-01-064-5458 contain precious materials?
Does NSN 5306-01-064-5458 contain hazardous materials?
When the NSN 5306-01-064-5458 was assigned to the Federal Catalog?
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