ST3M557-4-4
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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.
right-hand thread direction, 0.703 inches minimum and 0.750 inches maximum fastener length, oval countersunk head style, 0.443 inches minimum and 0.510 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
- 0.443 inches minimum and 0.510 inches maximum
- Fastener Length
- 0.703 inches minimum and 0.750 inches maximum
- Head Style
- oval countersunk
- Head Diameter
- 0.390 inches minimum and 0.395 inches maximum
- Grip Diameter
- 0.2490 inches minimum and 0.2495 inches maximum
- Internal Drive Style
- high-torque
- Nominal Thread Diameter
- 0.250 inches
- Grip Length
- 0.240 inches minimum and 0.260 inches maximum
- Thread Quantity Per Inch
- 28
- Countersink Angle
- 99.0 degrees minimum and 101.0 degrees maximum
- Material
- steel corrosion resisting overall
- Material Document And Classification
- 23-118 fscm 76301 mfr ref single material 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 |
|---|---|
| 10115341 | Close Tolerance Screw |
| HT4027-4-4 | Close Tolerance Screw |
| ST3M557-4-4 | Close Tolerance Screw |
| WC4027-4-4 | Close Tolerance Screw |
FAQs
Find helpful answers about installation, operation, maintenance, compliance, and troubleshooting.
What is the FSCG of the NSN 5305-01-133-1572?
Does the NSN 5305-01-133-1572 have a Schedule B code assigned?
Does NSN 5305-01-133-1572 require demilitarization?
Does NSN 5305-01-133-1572 contain precious materials?
Does NSN 5305-01-133-1572 contain hazardous materials?
When the NSN 5305-01-133-1572 was assigned to the Federal Catalog?
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