H148-8-86
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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.
0.735 inches minimum and 0.802 inches maximum thread length, flat countersunk head style, 3a thread class, 6.120 inches minimum and 6.167 inches maximum fastener length, right-hand thread direction
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
- 0.735 inches minimum and 0.802 inches maximum
- Fastener Length
- 6.120 inches minimum and 6.167 inches maximum
- Head Style
- flat countersunk
- Head Diameter
- 0.950 inches minimum and 1.017 inches maximum
- Grip Diameter
- 0.4982 inches minimum and 0.4991 inches maximum
- Internal Drive Style
- high-torque
- Nominal Thread Diameter
- 0.500 inches
- Grip Length
- 5.365 inches minimum and 5.385 inches maximum
- Thread Quantity Per Inch
- 20
- Hardness Rating
- 46.0 rockwell c minimum and 50.0 rockwell c maximum overall
- Countersink Angle
- 100.0 degrees nominal
- Surface Finish
- 32.0 microinches grip
- Part Name Assigned By Controlling Agency
- navy special project
- Material
- steel comp h11 overall
- Material Document And Classification
- ams 6487 assn std single material response overall
- Surface Treatment
- cadmium and chromate overall
- Surface Treatment Document And Classification
- mil-c-8837 ty 2 cl 2 mil spec single treatment response 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 |
|---|---|
| 106706H-8-86 | Close Tolerance Screw |
| GB510BC8-86 | Close Tolerance Screw |
| GB510CE8-86 | Close Tolerance Screw |
| GB510FD8-86 | Close Tolerance Screw |
| H148-8-86 | Close Tolerance Screw |
| HT171-8-86 | Close Tolerance Screw |
FAQs
Find helpful answers about installation, operation, maintenance, compliance, and troubleshooting.
What is the FSCG of the NSN 5305-01-059-0228?
Does the NSN 5305-01-059-0228 have a Schedule B code assigned?
Does NSN 5305-01-059-0228 require demilitarization?
Does NSN 5305-01-059-0228 contain precious materials?
Does NSN 5305-01-059-0228 contain hazardous materials?
When the NSN 5305-01-059-0228 was assigned to the Federal Catalog?
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